path: root/calendar/gui/e-cal-model.c

/*
 * Evolution calendar - Data model for ETable
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Authors:
 *      Rodrigo Moya <rodrigo@ximian.com>
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <string.h>
#include <glib/gi18n.h>

#include <libebackend/e-extensible.h>
#include <libedataserver/e-flag.h>
#include <libedataserver/e-time-utils.h>
#include <libecal/e-cal-client-view.h>
#include <libecal/e-cal-time-util.h>

#include <e-util/e-util.h>
#include <e-util/e-util-enumtypes.h>

#include <libemail-utils/e-account-utils.h>

#include "comp-util.h"
#include "e-cal-model.h"
#include "itip-utils.h"
#include "misc.h"

struct _ECalModelComponentPrivate {
    GString *categories_str;
};

typedef struct {
    ECalClient *client;
    ECalClientView *view;

    gboolean do_query;
    GCancellable *cancellable;
} ECalModelClient;

struct _ECalModelPrivate {
    /* The list of clients we are managing. Each element is of type ECalModelClient */
    GList *clients;

    /* The default client in the list */
    ECalClient *default_client;

    /* Array for storing the objects. Each element is of type ECalModelComponent */
    GPtrArray *objects;

    icalcomponent_kind kind;
    ECalModelFlags flags;
    icaltimezone *zone;

    /* The time range to display */
    time_t start;
    time_t end;

    /* The search regular expression */
    gchar *search_sexp;

    /* The full regular expression, including time range */
    gchar *full_sexp;

    /* The default category */
    gchar *default_category;

    /* Addresses for determining icons */
    EAccountList *accounts;

    /* Whether we display dates in 24-hour format. */
        gboolean use_24_hour_format;

    /* Whether to compress weekends into one cell. */
    gboolean compress_weekend;

    /* First day of the week: 0 (Monday) to 6 (Sunday) */
    gint week_start_day;

    /* Work day timespan */
    gint work_day_start_hour;
    gint work_day_start_minute;
    gint work_day_end_hour;
    gint work_day_end_minute;

    /* callback, to retrieve start time for newly added rows by click-to-add */
    ECalModelDefaultTimeFunc get_default_time;
    gpointer get_default_time_user_data;

    /* Default reminder for events */
    gboolean use_default_reminder;
    gint default_reminder_interval;
    EDurationType default_reminder_units;

    /* Ask user to confirm before deleting components. */
    gboolean confirm_delete;

    gboolean in_added;
    gboolean in_modified;
    gboolean in_removed;

    GHashTable *notify_added;
    GHashTable *notify_modified;
    GHashTable *notify_removed;

    GMutex *notify_lock;

    GCancellable *loading_clients;
};

static gint ecm_column_count (ETableModel *etm);
static gint ecm_row_count (ETableModel *etm);
static gpointer ecm_value_at (ETableModel *etm, gint col, gint row);
static void ecm_set_value_at (ETableModel *etm, gint col, gint row, gconstpointer value);
static gboolean ecm_is_cell_editable (ETableModel *etm, gint col, gint row);
static void ecm_append_row (ETableModel *etm, ETableModel *source, gint row);
static gpointer ecm_duplicate_value (ETableModel *etm, gint col, gconstpointer value);
static void ecm_free_value (ETableModel *etm, gint col, gpointer value);
static gpointer ecm_initialize_value (ETableModel *etm, gint col);
static gboolean ecm_value_is_empty (ETableModel *etm, gint col, gconstpointer value);
static gchar *ecm_value_to_string (ETableModel *etm, gint col, gconstpointer value);

static const gchar *ecm_get_color_for_component (ECalModel *model, ECalModelComponent *comp_data);

static ECalModelClient *add_new_client (ECalModel *model, ECalClient *client, gboolean do_query);
static ECalModelClient *find_client_data (ECalModel *model, ECalClient *client);
static void remove_client_objects (ECalModel *model, ECalModelClient *client_data);
static void remove_client (ECalModel *model, ECalModelClient *client_data);
static void redo_queries (ECalModel *model);

enum {
    PROP_0,
    PROP_COMPRESS_WEEKEND,
    PROP_CONFIRM_DELETE,
    PROP_DEFAULT_CLIENT,
    PROP_DEFAULT_REMINDER_INTERVAL,
    PROP_DEFAULT_REMINDER_UNITS,
    PROP_TIMEZONE,
    PROP_USE_24_HOUR_FORMAT,
    PROP_USE_DEFAULT_REMINDER,
    PROP_WEEK_START_DAY,
    PROP_WORK_DAY_END_HOUR,
    PROP_WORK_DAY_END_MINUTE,
    PROP_WORK_DAY_START_HOUR,
    PROP_WORK_DAY_START_MINUTE
};

enum {
    TIME_RANGE_CHANGED,
    ROW_APPENDED,
    COMPS_DELETED,
    CAL_VIEW_PROGRESS,
    CAL_VIEW_COMPLETE,
    STATUS_MESSAGE,
    TIMEZONE_CHANGED,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];

G_DEFINE_TYPE_WITH_CODE (
    ECalModel, e_cal_model, E_TYPE_TABLE_MODEL,
    G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))

static void
cal_model_set_property (GObject *object,
                        guint property_id,
                        const GValue *value,
                        GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_COMPRESS_WEEKEND:
            e_cal_model_set_compress_weekend (
                E_CAL_MODEL (object),
                g_value_get_boolean (value));
            return;

        case PROP_CONFIRM_DELETE:
            e_cal_model_set_confirm_delete (
                E_CAL_MODEL (object),
                g_value_get_boolean (value));
            return;

        case PROP_DEFAULT_CLIENT:
            e_cal_model_set_default_client (
                E_CAL_MODEL (object),
                g_value_get_object (value));
            return;

        case PROP_DEFAULT_REMINDER_INTERVAL:
            e_cal_model_set_default_reminder_interval (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;

        case PROP_DEFAULT_REMINDER_UNITS:
            e_cal_model_set_default_reminder_units (
                E_CAL_MODEL (object),
                g_value_get_enum (value));
            return;

        case PROP_TIMEZONE:
            e_cal_model_set_timezone (
                E_CAL_MODEL (object),
                g_value_get_pointer (value));
            return;

        case PROP_USE_24_HOUR_FORMAT:
            e_cal_model_set_use_24_hour_format (
                E_CAL_MODEL (object),
                g_value_get_boolean (value));
            return;

        case PROP_USE_DEFAULT_REMINDER:
            e_cal_model_set_use_default_reminder (
                E_CAL_MODEL (object),
                g_value_get_boolean (value));
            return;

        case PROP_WEEK_START_DAY:
            e_cal_model_set_week_start_day (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;

        case PROP_WORK_DAY_END_HOUR:
            e_cal_model_set_work_day_end_hour (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;

        case PROP_WORK_DAY_END_MINUTE:
            e_cal_model_set_work_day_end_minute (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;

        case PROP_WORK_DAY_START_HOUR:
            e_cal_model_set_work_day_start_hour (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;

        case PROP_WORK_DAY_START_MINUTE:
            e_cal_model_set_work_day_start_minute (
                E_CAL_MODEL (object),
                g_value_get_int (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cal_model_get_property (GObject *object,
                        guint property_id,
                        GValue *value,
                        GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_COMPRESS_WEEKEND:
            g_value_set_boolean (
                value,
                e_cal_model_get_compress_weekend (
                E_CAL_MODEL (object)));
            return;

        case PROP_CONFIRM_DELETE:
            g_value_set_boolean (
                value,
                e_cal_model_get_confirm_delete (
                E_CAL_MODEL (object)));
            return;

        case PROP_DEFAULT_CLIENT:
            g_value_set_object (
                value,
                e_cal_model_get_default_client (
                E_CAL_MODEL (object)));
            return;

        case PROP_DEFAULT_REMINDER_INTERVAL:
            g_value_set_int (
                value,
                e_cal_model_get_default_reminder_interval (
                E_CAL_MODEL (object)));
            return;

        case PROP_DEFAULT_REMINDER_UNITS:
            g_value_set_enum (
                value,
                e_cal_model_get_default_reminder_units (
                E_CAL_MODEL (object)));
            return;

        case PROP_TIMEZONE:
            g_value_set_pointer (
                value,
                e_cal_model_get_timezone (
                E_CAL_MODEL (object)));
            return;

        case PROP_USE_24_HOUR_FORMAT:
            g_value_set_boolean (
                value,
                e_cal_model_get_use_24_hour_format (
                E_CAL_MODEL (object)));
            return;

        case PROP_USE_DEFAULT_REMINDER:
            g_value_set_boolean (
                value,
                e_cal_model_get_use_default_reminder (
                E_CAL_MODEL (object)));
            return;

        case PROP_WEEK_START_DAY:
            g_value_set_int (
                value,
                e_cal_model_get_week_start_day (
                E_CAL_MODEL (object)));
            return;

        case PROP_WORK_DAY_END_HOUR:
            g_value_set_int (
                value,
                e_cal_model_get_work_day_end_hour (
                E_CAL_MODEL (object)));
            return;

        case PROP_WORK_DAY_END_MINUTE:
            g_value_set_int (
                value,
                e_cal_model_get_work_day_end_minute (
                E_CAL_MODEL (object)));
            return;

        case PROP_WORK_DAY_START_HOUR:
            g_value_set_int (
                value,
                e_cal_model_get_work_day_start_hour (
                E_CAL_MODEL (object)));
            return;

        case PROP_WORK_DAY_START_MINUTE:
            g_value_set_int (
                value,
                e_cal_model_get_work_day_start_minute (
                E_CAL_MODEL (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cal_model_constructed (GObject *object)
{
    e_extensible_load_extensions (E_EXTENSIBLE (object));

    /* Chain up to parent's constructed() method. */
    G_OBJECT_CLASS (parent_class)->constructed (object);
}

static void
cal_model_dispose (GObject *object)
{
    ECalModelPrivate *priv;

    priv = E_CAL_MODEL (object)->priv;

    if (priv->loading_clients) {
        g_cancellable_cancel (priv->loading_clients);
        g_object_unref (priv->loading_clients);
        priv->loading_clients = NULL;
    }

    if (priv->clients) {
        while (priv->clients != NULL) {
            ECalModelClient *client_data = (ECalModelClient *) priv->clients->data;

            g_signal_handlers_disconnect_matched (client_data->client, G_SIGNAL_MATCH_DATA,
                                  0, 0, NULL, NULL, object);
            if (client_data->view)
                g_signal_handlers_disconnect_matched (client_data->view, G_SIGNAL_MATCH_DATA,
                                      0, 0, NULL, NULL, object);

            priv->clients = g_list_remove (priv->clients, client_data);

            g_object_unref (client_data->client);
            if (client_data->cancellable) {
                g_cancellable_cancel (client_data->cancellable);
                g_object_unref (client_data->cancellable);
            }
            if (client_data->view)
                g_object_unref (client_data->view);
            g_free (client_data);
        }

        priv->clients = NULL;
        priv->default_client = NULL;
    }

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (parent_class)->dispose (object);
}

static void
cal_model_finalize (GObject *object)
{
    ECalModelPrivate *priv;
    gint ii;

    priv = E_CAL_MODEL (object)->priv;

    g_free (priv->search_sexp);
    g_free (priv->full_sexp);

    g_free (priv->default_category);

    for (ii = 0; ii < priv->objects->len; ii++) {
        ECalModelComponent *comp_data;

        comp_data = g_ptr_array_index (priv->objects, ii);
        if (comp_data == NULL) {
            g_warning ("comp_data is null\n");
            continue;
        }
        g_object_unref (comp_data);
    }
    g_ptr_array_free (priv->objects, FALSE);

    g_mutex_free (priv->notify_lock);

    g_hash_table_destroy (priv->notify_added);
    g_hash_table_destroy (priv->notify_modified);
    g_hash_table_destroy (priv->notify_removed);

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (parent_class)->finalize (object);
}

static void
e_cal_model_class_init (ECalModelClass *class)
{
    GObjectClass *object_class;
    ETableModelClass *etm_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (ECalModelPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = cal_model_set_property;
    object_class->get_property = cal_model_get_property;
    object_class->constructed = cal_model_constructed;
    object_class->dispose = cal_model_dispose;
    object_class->finalize = cal_model_finalize;

    etm_class = E_TABLE_MODEL_CLASS (class);
    etm_class->column_count = ecm_column_count;
    etm_class->row_count = ecm_row_count;
    etm_class->value_at = ecm_value_at;
    etm_class->set_value_at = ecm_set_value_at;
    etm_class->is_cell_editable = ecm_is_cell_editable;
    etm_class->append_row = ecm_append_row;
    etm_class->duplicate_value = ecm_duplicate_value;
    etm_class->free_value = ecm_free_value;
    etm_class->initialize_value = ecm_initialize_value;
    etm_class->value_is_empty = ecm_value_is_empty;
    etm_class->value_to_string = ecm_value_to_string;

    class->get_color_for_component = ecm_get_color_for_component;
    class->fill_component_from_model = NULL;

    g_object_class_install_property (
        object_class,
        PROP_COMPRESS_WEEKEND,
        g_param_spec_boolean (
            "compress-weekend",
            "Compress Weekend",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_CONFIRM_DELETE,
        g_param_spec_boolean (
            "confirm-delete",
            "Confirm Delete",
            NULL,
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_DEFAULT_CLIENT,
        g_param_spec_object (
            "default-client",
            "Default ECalClient",
            NULL,
            E_TYPE_CAL_CLIENT,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_DEFAULT_REMINDER_INTERVAL,
        g_param_spec_int (
            "default-reminder-interval",
            "Default Reminder Interval",
            NULL,
            G_MININT,
            G_MAXINT,
            0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_DEFAULT_REMINDER_UNITS,
        g_param_spec_enum (
            "default-reminder-units",
            "Default Reminder Units",
            NULL,
            E_TYPE_DURATION_TYPE,
            E_DURATION_MINUTES,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_TIMEZONE,
        g_param_spec_pointer (
            "timezone",
            "Time Zone",
            NULL,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_USE_24_HOUR_FORMAT,
        g_param_spec_boolean (
            "use-24-hour-format",
            "Use 24-Hour Format",
            NULL,
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_USE_DEFAULT_REMINDER,
        g_param_spec_boolean (
            "use-default-reminder",
            "Use Default Reminder",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WEEK_START_DAY,
        g_param_spec_int (
            "week-start-day",
            "Week Start Day",
            NULL,
            0,  /* Monday */
            6,  /* Sunday */
            0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WORK_DAY_END_HOUR,
        g_param_spec_int (
            "work-day-end-hour",
            "Work Day End Hour",
            NULL,
            0,
            23,
            0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WORK_DAY_END_MINUTE,
        g_param_spec_int (
            "work-day-end-minute",
            "Work Day End Minute",
            NULL,
            0,
            59,
            0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WORK_DAY_START_HOUR,
        g_param_spec_int (
            "work-day-start-hour",
            "Work Day Start Hour",
            NULL,
            0,
            23,
            0,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_WORK_DAY_START_MINUTE,
        g_param_spec_int (
            "work-day-start-minute",
            "Work Day Start Minute",
            NULL,
            0,
            59,
            0,
            G_PARAM_READWRITE));

    signals[TIME_RANGE_CHANGED] =
        g_signal_new ("time_range_changed",
                  G_TYPE_FROM_CLASS (class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECalModelClass, time_range_changed),
                  NULL, NULL,
                  e_marshal_VOID__LONG_LONG,
                  G_TYPE_NONE, 2, G_TYPE_LONG, G_TYPE_LONG);

    signals[ROW_APPENDED] =
        g_signal_new ("row_appended",
                  G_TYPE_FROM_CLASS (class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECalModelClass, row_appended),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__VOID,
                  G_TYPE_NONE, 0);

    signals[COMPS_DELETED] =
        g_signal_new ("comps_deleted",
                  G_TYPE_FROM_CLASS (class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECalModelClass, comps_deleted),
                  NULL, NULL,
                  g_cclosure_marshal_VOID__POINTER,
                  G_TYPE_NONE, 1, G_TYPE_POINTER);

    signals[CAL_VIEW_PROGRESS] =
        g_signal_new ("cal_view_progress",
                  G_TYPE_FROM_CLASS (class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECalModelClass, cal_view_progress),
                  NULL, NULL,
                  e_marshal_VOID__STRING_INT_INT,
                  G_TYPE_NONE, 3, G_TYPE_STRING, G_TYPE_INT, G_TYPE_INT);

    signals[CAL_VIEW_COMPLETE] =
        g_signal_new ("cal_view_complete",
                  G_TYPE_FROM_CLASS (class),
                  G_SIGNAL_RUN_LAST,
                  G_STRUCT_OFFSET (ECalModelClass, cal_view_complete),
                  NULL, NULL,
                  e_marshal_VOID__BOXED_INT,
                  G_TYPE_NONE, 2, G_TYPE_ERROR, G_TYPE_INT);

    signals[STATUS_MESSAGE] = g_signal_new (
        "status-message",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
        G_STRUCT_OFFSET (ECalModelClass, status_message),
        NULL, NULL,
        e_marshal_VOID__STRING_DOUBLE,
        G_TYPE_NONE, 2,
        G_TYPE_STRING, G_TYPE_DOUBLE);
    signals[TIMEZONE_CHANGED] = g_signal_new (
        "timezone-changed",
        G_TYPE_FROM_CLASS (class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ECalModelClass, timezone_changed),
        NULL, NULL,
        e_marshal_VOID__POINTER_POINTER,
        G_TYPE_NONE, 2,
        G_TYPE_POINTER,
        G_TYPE_POINTER);
}

static void
e_cal_model_init (ECalModel *model)
{
    model->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        model, E_TYPE_CAL_MODEL, ECalModelPrivate);

    /* match none by default */
    model->priv->start = -1;
    model->priv->end = -1;
    model->priv->search_sexp = NULL;
    model->priv->full_sexp = g_strdup ("#f");

    model->priv->objects = g_ptr_array_new ();
    model->priv->kind = ICAL_NO_COMPONENT;
    model->priv->flags = 0;

    model->priv->accounts = e_get_account_list ();

    model->priv->use_24_hour_format = TRUE;

    model->priv->in_added = FALSE;
    model->priv->in_modified = FALSE;
    model->priv->in_removed = FALSE;
    model->priv->notify_added = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
    model->priv->notify_modified = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
    model->priv->notify_removed = g_hash_table_new_full (g_direct_hash, g_direct_equal, g_object_unref, NULL);
    model->priv->notify_lock = g_mutex_new ();

    model->priv->loading_clients = g_cancellable_new ();
}

/* ETableModel methods */

static gint
ecm_column_count (ETableModel *etm)
{
    return E_CAL_MODEL_FIELD_LAST;
}

static gint
ecm_row_count (ETableModel *etm)
{
    ECalModelPrivate *priv;
    ECalModel *model = (ECalModel *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), -1);

    priv = model->priv;

    return priv->objects->len;
}

static gpointer
get_categories (ECalModelComponent *comp_data)
{
    if (!comp_data->priv->categories_str) {
        icalproperty *prop;

        comp_data->priv->categories_str = g_string_new ("");

        for (prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_CATEGORIES_PROPERTY);
             prop;
             prop = icalcomponent_get_next_property (comp_data->icalcomp, ICAL_CATEGORIES_PROPERTY)) {
            const gchar *categories = icalproperty_get_categories (prop);
            if (!categories)
                continue;

            if (comp_data->priv->categories_str->len)
                g_string_append_c (comp_data->priv->categories_str, ',');
            g_string_append (comp_data->priv->categories_str, categories);
        }
    }

    return comp_data->priv->categories_str->str;
}

static gchar *
get_classification (ECalModelComponent *comp_data)
{
    icalproperty *prop;
    icalproperty_class class;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_CLASS_PROPERTY);

    if (!prop)
        return _("Public");

    class = icalproperty_get_class (prop);

    switch (class)
    {
    case ICAL_CLASS_PUBLIC:
        return _("Public");
    case ICAL_CLASS_PRIVATE:
        return _("Private");
    case ICAL_CLASS_CONFIDENTIAL:
        return _("Confidential");
    default:
        return _("Unknown");
    }
}

static const gchar *
get_color (ECalModel *model,
           ECalModelComponent *comp_data)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    return e_cal_model_get_color_for_component (model, comp_data);
}

static gpointer
get_description (ECalModelComponent *comp_data)
{
    icalproperty *prop;
    static GString *str = NULL;

    if (str) {
        g_string_free (str, TRUE);
        str = NULL;
    }

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DESCRIPTION_PROPERTY);
    if (prop) {
        str = g_string_new (NULL);
        do {
            str = g_string_append (str, icalproperty_get_description (prop));
        } while ((prop = icalcomponent_get_next_property (comp_data->icalcomp, ICAL_DESCRIPTION_PROPERTY)));

        return str->str;
    }

    return (gpointer) "";
}

static ECellDateEditValue *
get_dtstart (ECalModel *model,
             ECalModelComponent *comp_data)
{
    ECalModelPrivate *priv;
    struct icaltimetype tt_start;

    priv = model->priv;

    if (!comp_data->dtstart) {
        icalproperty *prop;
        icaltimezone *zone;
        gboolean got_zone = FALSE;

        prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DTSTART_PROPERTY);
        if (!prop)
            return NULL;

        tt_start = icalproperty_get_dtstart (prop);

        if (icaltime_get_tzid (tt_start)
            && e_cal_client_get_timezone_sync (comp_data->client, icaltime_get_tzid (tt_start), &zone, NULL, NULL))
            got_zone = TRUE;

        if (e_cal_model_get_flags (model) & E_CAL_MODEL_FLAGS_EXPAND_RECURRENCES) {
            if (got_zone) {
                tt_start = icaltime_from_timet_with_zone (comp_data->instance_start, tt_start.is_date, zone);
                if (priv->zone)
                    icaltimezone_convert_time (&tt_start, zone, priv->zone);
            } else
                if (priv->zone)
                    tt_start = icaltime_from_timet_with_zone (comp_data->instance_start, tt_start.is_date, priv->zone);
        }

        if (!icaltime_is_valid_time (tt_start) || icaltime_is_null_time (tt_start))
            return NULL;

        comp_data->dtstart = g_new0 (ECellDateEditValue, 1);
        comp_data->dtstart->tt = tt_start;

        if (got_zone)
            comp_data->dtstart->zone = zone;
        else
            comp_data->dtstart->zone = NULL;
    }

    return comp_data->dtstart;
}

static ECellDateEditValue *
get_datetime_from_utc (ECalModel *model,
                       ECalModelComponent *comp_data,
                       icalproperty_kind propkind,
                       struct icaltimetype (*get_value) (const icalproperty *prop),
                                                         ECellDateEditValue **buffer)
{
    ECalModelPrivate *priv;
    struct icaltimetype tt_value;
    icalproperty *prop;
    ECellDateEditValue *res;

    g_return_val_if_fail (buffer!= NULL, NULL);

    if (*buffer)
        return *buffer;

    priv = model->priv;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, propkind);
    if (!prop)
        return NULL;

    tt_value = get_value (prop);

    /* these are always in UTC, thus convert to default zone, if any and done */
    if (priv->zone)
        icaltimezone_convert_time (&tt_value, icaltimezone_get_utc_timezone (), priv->zone);

    if (!icaltime_is_valid_time (tt_value) || icaltime_is_null_time (tt_value))
        return NULL;

    res = g_new0 (ECellDateEditValue, 1);
    res->tt = tt_value;
    res->zone = NULL;

    *buffer = res;

    return res;
}

static gpointer
get_summary (ECalModelComponent *comp_data)
{
    icalproperty *prop;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_SUMMARY_PROPERTY);
    if (prop)
        return (gpointer) icalproperty_get_summary (prop);

    return (gpointer) "";
}

static gchar *
get_uid (ECalModelComponent *comp_data)
{
    return (gchar *) icalcomponent_get_uid (comp_data->icalcomp);
}

static gpointer
ecm_value_at (ETableModel *etm,
              gint col,
              gint row)
{
    ECalModelPrivate *priv;
    ECalModelComponent *comp_data;
    ECalModel *model = (ECalModel *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST, NULL);
    g_return_val_if_fail (row >= 0 && row < priv->objects->len, NULL);

    comp_data = g_ptr_array_index (priv->objects, row);
    g_return_val_if_fail (comp_data != NULL, NULL);
    g_return_val_if_fail (comp_data->icalcomp != NULL, NULL);

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
        return get_categories (comp_data);
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
        return get_classification (comp_data);
    case E_CAL_MODEL_FIELD_COLOR :
        return (gpointer) get_color (model, comp_data);
    case E_CAL_MODEL_FIELD_COMPONENT :
        return comp_data->icalcomp;
    case E_CAL_MODEL_FIELD_DESCRIPTION :
        return get_description (comp_data);
    case E_CAL_MODEL_FIELD_DTSTART :
        return (gpointer) get_dtstart (model, comp_data);
    case E_CAL_MODEL_FIELD_CREATED :
        return (gpointer) get_datetime_from_utc (model, comp_data, ICAL_CREATED_PROPERTY, icalproperty_get_created, &comp_data->created);
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
        return (gpointer) get_datetime_from_utc (model, comp_data, ICAL_LASTMODIFIED_PROPERTY, icalproperty_get_lastmodified, &comp_data->lastmodified);
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
        return GINT_TO_POINTER ((icalcomponent_get_first_component (comp_data->icalcomp,
                                        ICAL_VALARM_COMPONENT) != NULL));
    case E_CAL_MODEL_FIELD_ICON :
    {
        ECalComponent *comp;
        icalcomponent *icalcomp;
        gint retval = 0;

        comp = e_cal_component_new ();
        icalcomp = icalcomponent_new_clone (comp_data->icalcomp);
        if (e_cal_component_set_icalcomponent (comp, icalcomp)) {
            if (e_cal_component_get_vtype (comp) == E_CAL_COMPONENT_JOURNAL) {
                g_object_unref (comp);
                return GINT_TO_POINTER (retval);
            }

            if (e_cal_component_has_recurrences (comp))
                retval = 1;
            else if (itip_organizer_is_user (comp, comp_data->client))
                retval = 3;
            else {
                GSList *attendees = NULL, *sl;

                e_cal_component_get_attendee_list (comp, &attendees);
                for (sl = attendees; sl != NULL; sl = sl->next) {
                    ECalComponentAttendee *ca = sl->data;
                    const gchar *text;

                    text = itip_strip_mailto (ca->value);
                    if (itip_address_is_user (text)) {
                        if (ca->delto != NULL)
                            retval = 3;
                        else
                            retval = 2;
                        break;
                    }
                }

                e_cal_component_free_attendee_list (attendees);
            }
        } else
            icalcomponent_free (icalcomp);

        g_object_unref (comp);

        return GINT_TO_POINTER (retval);
    }
    case E_CAL_MODEL_FIELD_SUMMARY :
        return get_summary (comp_data);
    case E_CAL_MODEL_FIELD_UID :
        return get_uid (comp_data);
    }

    return (gpointer) "";
}

static void
set_categories (ECalModelComponent *comp_data,
                const gchar *value)
{
    icalproperty *prop;

    /* remove all categories first */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_CATEGORIES_PROPERTY);
    while (prop) {
        icalproperty *to_remove = prop;
        prop = icalcomponent_get_next_property (comp_data->icalcomp, ICAL_CATEGORIES_PROPERTY);

        icalcomponent_remove_property (comp_data->icalcomp, to_remove);
        icalproperty_free (to_remove);
    }

    if (comp_data->priv->categories_str)
        g_string_free (comp_data->priv->categories_str, TRUE);
    comp_data->priv->categories_str = NULL;

    /* then set a new value; no need to populate categories_str,
     * it'll be populated on demand (in the get_categories() function)
    */
    if (value && *value) {
        prop = icalproperty_new_categories (value);
        icalcomponent_add_property (comp_data->icalcomp, prop);
    }
}

static void
set_classification (ECalModelComponent *comp_data,
                    const gchar *value)
{
    icalproperty *prop;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_CLASS_PROPERTY);
    if (!value || !(*value)) {
        if (prop) {
            icalcomponent_remove_property (comp_data->icalcomp, prop);
            icalproperty_free (prop);
        }
    } else {
      icalproperty_class ical_class;

      if (!g_ascii_strcasecmp (value, "PUBLIC"))
        ical_class = ICAL_CLASS_PUBLIC;
      else if (!g_ascii_strcasecmp (value, "PRIVATE"))
        ical_class = ICAL_CLASS_PRIVATE;
      else if (!g_ascii_strcasecmp (value, "CONFIDENTIAL"))
        ical_class = ICAL_CLASS_CONFIDENTIAL;
      else
        ical_class = ICAL_CLASS_NONE;

        if (!prop) {
            prop = icalproperty_new_class (ical_class);
            icalcomponent_add_property (comp_data->icalcomp, prop);
        } else
            icalproperty_set_class (prop, ical_class);
    }
}

static void
set_description (ECalModelComponent *comp_data,
                 const gchar *value)
{
    icalproperty *prop;

    /* remove old description(s) */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DESCRIPTION_PROPERTY);
    while (prop) {
        icalproperty *next;

        next = icalcomponent_get_next_property (comp_data->icalcomp, ICAL_DESCRIPTION_PROPERTY);

        icalcomponent_remove_property (comp_data->icalcomp, prop);
        icalproperty_free (prop);

        prop = next;
    }

    /* now add the new description */
    if (!value || !(*value))
        return;

    prop = icalproperty_new_description (value);
    icalcomponent_add_property (comp_data->icalcomp, prop);
}

static void
datetime_to_zone (ECalClient *client,
                  struct icaltimetype *tt,
                  icaltimezone *tt_zone,
                  const gchar *tzid)
{
    icaltimezone *from, *to;
    const gchar *tt_tzid = NULL;

    g_return_if_fail (tt != NULL);

    if (tt_zone)
        tt_tzid = icaltimezone_get_tzid (tt_zone);

    if (tt_tzid == NULL || tzid == NULL ||
        tt_tzid == tzid || g_str_equal (tt_tzid, tzid))
        return;

    from = tt_zone;
    to = icaltimezone_get_builtin_timezone_from_tzid (tzid);
    if (!to) {
        /* do not check failure here, maybe the zone is not available there */
        e_cal_client_get_timezone_sync (client, tzid, &to, NULL, NULL);
    }

    icaltimezone_convert_time (tt, from, to);
}

/* updates time in a component, and keeps the timezone used in it, if exists */
void
e_cal_model_update_comp_time (ECalModel *model,
                              ECalModelComponent *comp_data,
                              gconstpointer time_value,
                              icalproperty_kind kind,
                              void (*set_func) (icalproperty *prop,
                                                struct icaltimetype v),
                              icalproperty * (*new_func) (struct icaltimetype v))
{
    ECellDateEditValue *dv = (ECellDateEditValue *) time_value;
    icalproperty *prop;
    icalparameter *param;
    struct icaltimetype tt;

    g_return_if_fail (model != NULL);
    g_return_if_fail (comp_data != NULL);
    g_return_if_fail (set_func != NULL);
    g_return_if_fail (new_func != NULL);

    prop = icalcomponent_get_first_property (comp_data->icalcomp, kind);
    if (prop)
        param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER);
    else
        param = NULL;

    /* If we are setting the property to NULL (i.e. removing it), then
     * we remove it if it exists. */
    if (!dv) {
        if (prop) {
            icalcomponent_remove_property (comp_data->icalcomp, prop);
            icalproperty_free (prop);
        }

        return;
    }

    tt = dv->tt;
    datetime_to_zone (comp_data->client, &tt, e_cal_model_get_timezone (model), param ? icalparameter_get_tzid (param) : NULL);

    if (prop) {
        set_func (prop, tt);
    } else {
        prop = new_func (tt);
        icalcomponent_add_property (comp_data->icalcomp, prop);
    }

    if (param) {
        const gchar *tzid = icalparameter_get_tzid (param);

        /* If the TZID is set to "UTC", we don't want to save the TZID. */
        if (tzid && strcmp (tzid, "UTC")) {
            if (param) {
                icalparameter_set_tzid (param, (gchar *) tzid);
            } else {
                param = icalparameter_new_tzid ((gchar *) tzid);
                icalproperty_add_parameter (prop, param);
            }
        } else {
            icalproperty_remove_parameter (prop, ICAL_TZID_PARAMETER);
        }
    }
}

static void
set_dtstart (ECalModel *model,
             ECalModelComponent *comp_data,
             gconstpointer value)
{
    e_cal_model_update_comp_time (
        model, comp_data, value,
        ICAL_DTSTART_PROPERTY,
        icalproperty_set_dtstart,
        icalproperty_new_dtstart);
}

static void
set_summary (ECalModelComponent *comp_data,
             const gchar *value)
{
    icalproperty *prop;

    prop = icalcomponent_get_first_property (
        comp_data->icalcomp, ICAL_SUMMARY_PROPERTY);

    if (string_is_empty (value)) {
        if (prop) {
            icalcomponent_remove_property (comp_data->icalcomp, prop);
            icalproperty_free (prop);
        }
    } else {
        if (prop)
            icalproperty_set_summary (prop, value);
        else {
            prop = icalproperty_new_summary (value);
            icalcomponent_add_property (comp_data->icalcomp, prop);
        }
    }
}

static void
ecm_set_value_at (ETableModel *etm,
                  gint col,
                  gint row,
                  gconstpointer value)
{
    ECalModelPrivate *priv;
    ECalModelComponent *comp_data;
    ECalModel *model = (ECalModel *) etm;
    GError *error = NULL;

    g_return_if_fail (E_IS_CAL_MODEL (model));

    priv = model->priv;

    g_return_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST);
    g_return_if_fail (row >= 0 && row < priv->objects->len);

    comp_data = g_ptr_array_index (priv->objects, row);
    g_return_if_fail (comp_data != NULL);

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
        set_categories (comp_data, value);
        break;
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
        set_classification (comp_data, value);
        break;
    case E_CAL_MODEL_FIELD_DESCRIPTION :
        set_description (comp_data, value);
        break;
    case E_CAL_MODEL_FIELD_DTSTART :
        set_dtstart (model, comp_data, value);
        break;
    case E_CAL_MODEL_FIELD_SUMMARY :
        set_summary (comp_data, value);
        break;
    }

    /* FIXME ask about mod type */
    if (!e_cal_client_modify_object_sync (comp_data->client, comp_data->icalcomp, CALOBJ_MOD_ALL, NULL, &error)) {
        g_warning (G_STRLOC ": Could not modify the object! %s", error ? error->message : "Unknown error");

        /* FIXME Show error dialog */
        if (error)
            g_error_free (error);
    }
}

/**
 * e_cal_model_test_row_editable
 * @model: an #ECalModel
 * @row: Row of our interest. -1 is editable only when default client is
 * editable.
 *
 * Checks if component at @row is editable or not.  It doesn't check bounds
 * for @row.
 *
 * Returns: Whether @row is editable or not.
 **/
gboolean
e_cal_model_test_row_editable (ECalModel *model,
                               gint row)
{
    gboolean readonly;
    ECalClient *client = NULL;

    if (row != -1) {
        ECalModelComponent *comp_data;

        comp_data = e_cal_model_get_component_at (model, row);

        if (comp_data)
            client = comp_data->client;

    } else {
        client = e_cal_model_get_default_client (model);
    }

    readonly = client == NULL;

    if (!readonly)
        readonly = e_client_is_readonly (E_CLIENT (client));

    return !readonly;
}

static gboolean
ecm_is_cell_editable (ETableModel *etm,
                      gint col,
                      gint row)
{
    ECalModelPrivate *priv;
    ECalModel *model = (ECalModel *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), FALSE);

    priv = model->priv;

    g_return_val_if_fail (col >= 0 && col <= E_CAL_MODEL_FIELD_LAST, FALSE);
    g_return_val_if_fail (row >= -1 || (row >= 0 && row < priv->objects->len), FALSE);

    if (!e_cal_model_test_row_editable (E_CAL_MODEL (etm), row))
        return FALSE;

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_SUMMARY :
        return TRUE;
    }

    return FALSE;
}

static void
ecm_append_row (ETableModel *etm,
                ETableModel *source,
                gint row)
{
    ECalModelClass *model_class;
    ECalModelComponent *comp_data;
    ECalModel *model = (ECalModel *) etm;
    gchar *uid = NULL;
    GError *error = NULL;

    g_return_if_fail (E_IS_CAL_MODEL (model));
    g_return_if_fail (E_IS_TABLE_MODEL (source));

    comp_data = g_object_new (E_TYPE_CAL_MODEL_COMPONENT, NULL);

    comp_data->client = e_cal_model_get_default_client (model);
    if (comp_data->client)
        g_object_ref (comp_data->client);

    /* guard against saving before the calendar is open */
    if (!comp_data->client || !e_client_is_opened (E_CLIENT (comp_data->client))) {
        g_object_unref (comp_data);
        return;
    }

    comp_data->icalcomp = e_cal_model_create_component_with_defaults (model, FALSE);

    /* set values for our fields */
    set_categories (comp_data, e_table_model_value_at (source, E_CAL_MODEL_FIELD_CATEGORIES, row));
    set_classification (comp_data, e_table_model_value_at (source, E_CAL_MODEL_FIELD_CLASSIFICATION, row));
    set_description (comp_data, e_table_model_value_at (source, E_CAL_MODEL_FIELD_DESCRIPTION, row));
    set_summary (comp_data, e_table_model_value_at (source, E_CAL_MODEL_FIELD_SUMMARY, row));

    if (e_table_model_value_at (source, E_CAL_MODEL_FIELD_DTSTART, row)) {
        set_dtstart (model, comp_data, e_table_model_value_at (source, E_CAL_MODEL_FIELD_DTSTART, row));
    } else if (model->priv->get_default_time) {
        time_t tt = model->priv->get_default_time (model, model->priv->get_default_time_user_data);

        if (tt > 0) {
            struct icaltimetype itt = icaltime_from_timet_with_zone (tt, FALSE, e_cal_model_get_timezone (model));
            icalproperty *prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DTSTART_PROPERTY);

            if (prop) {
                icalproperty_set_dtstart (prop, itt);
            } else {
                prop = icalproperty_new_dtstart (itt);
                icalcomponent_add_property (comp_data->icalcomp, prop);
            }
        }
    }

    /* call the class' method for filling the component */
    model_class = (ECalModelClass *) G_OBJECT_GET_CLASS (model);
    if (model_class->fill_component_from_model != NULL) {
        model_class->fill_component_from_model (model, comp_data, source, row);
    }

    if (!e_cal_client_create_object_sync (comp_data->client, comp_data->icalcomp, &uid, NULL, &error)) {
        g_warning (G_STRLOC ": Could not create the object! %s", error ? error->message : "Unknown error");

        /* FIXME: show error dialog */
        if (error)
            g_error_free (error);
    } else {
        if (uid)
            icalcomponent_set_uid (comp_data->icalcomp, uid);

        g_signal_emit (G_OBJECT (model), signals[ROW_APPENDED], 0);
    }

    g_free (uid);
    g_object_unref (comp_data);
}

static gpointer
ecm_duplicate_value (ETableModel *etm,
                     gint col,
                     gconstpointer value)
{
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST, NULL);

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_SUMMARY :
        return g_strdup (value);
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
    case E_CAL_MODEL_FIELD_ICON :
    case E_CAL_MODEL_FIELD_COLOR :
        return (gpointer) value;
    case E_CAL_MODEL_FIELD_COMPONENT :
        return icalcomponent_new_clone ((icalcomponent *) value);
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_CREATED :
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
        if (value) {
            ECellDateEditValue *dv, *orig_dv;

            orig_dv = (ECellDateEditValue *) value;
            dv = g_new0 (ECellDateEditValue, 1);
            *dv = *orig_dv;

            return dv;
        }
        break;
    }

    return NULL;
}

static void
ecm_free_value (ETableModel *etm,
                gint col,
                gpointer value)
{
    g_return_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST);

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_SUMMARY :
        if (value)
            g_free (value);
        break;
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
    case E_CAL_MODEL_FIELD_ICON :
    case E_CAL_MODEL_FIELD_COLOR :
        break;
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_CREATED :
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
        if (value)
            g_free (value);
        break;
    case E_CAL_MODEL_FIELD_COMPONENT :
        if (value)
            icalcomponent_free ((icalcomponent *) value);
        break;
    }
}

static gpointer
ecm_initialize_value (ETableModel *etm,
                      gint col)
{
    ECalModelPrivate *priv;
    ECalModel *model = (ECalModel *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST, NULL);

    priv = model->priv;

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
        return g_strdup (priv->default_category?priv->default_category:"");
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_SUMMARY :
        return g_strdup ("");
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_CREATED :
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
    case E_CAL_MODEL_FIELD_ICON :
    case E_CAL_MODEL_FIELD_COLOR :
    case E_CAL_MODEL_FIELD_COMPONENT :
        return NULL;
    }

    return NULL;
}

static gboolean
ecm_value_is_empty (ETableModel *etm,
                    gint col,
                    gconstpointer value)
{
    ECalModelPrivate *priv;
    ECalModel *model = (ECalModel *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), TRUE);
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST, TRUE);

    priv = model->priv;

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
        /* This could be a hack or not.  If the categories field only
         * contains the default category, then it possibly means that
         * the user has not entered anything at all in the click-to-add;
         * the category is in the value because we put it there in
         * ecm_initialize_value().
         */
        if (priv->default_category && value && strcmp (priv->default_category, value) == 0)
            return TRUE;
        else
            return string_is_empty (value);
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_SUMMARY :
        return string_is_empty (value);
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_CREATED :
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
        return value ? FALSE : TRUE;
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
    case E_CAL_MODEL_FIELD_ICON :
    case E_CAL_MODEL_FIELD_COLOR :
    case E_CAL_MODEL_FIELD_COMPONENT :
        return TRUE;
    }

    return TRUE;
}

static gchar *
ecm_value_to_string (ETableModel *etm,
                     gint col,
                     gconstpointer value)
{
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_FIELD_LAST, g_strdup (""));

    switch (col) {
    case E_CAL_MODEL_FIELD_CATEGORIES :
    case E_CAL_MODEL_FIELD_CLASSIFICATION :
    case E_CAL_MODEL_FIELD_DESCRIPTION :
    case E_CAL_MODEL_FIELD_SUMMARY :
        return g_strdup (value);
    case E_CAL_MODEL_FIELD_DTSTART :
    case E_CAL_MODEL_FIELD_CREATED :
    case E_CAL_MODEL_FIELD_LASTMODIFIED :
        return e_cal_model_date_value_to_string (E_CAL_MODEL (etm), value);
    case E_CAL_MODEL_FIELD_ICON :
        if (GPOINTER_TO_INT (value) == 0)
            return g_strdup (_("Normal"));
        else if (GPOINTER_TO_INT (value) == 1)
            return g_strdup (_("Recurring"));
        else
            return g_strdup (_("Assigned"));
    case E_CAL_MODEL_FIELD_HAS_ALARMS :
        return g_strdup (value ? _("Yes") : _("No"));
    case E_CAL_MODEL_FIELD_COLOR :
    case E_CAL_MODEL_FIELD_COMPONENT :
        return g_strdup ("");
    }

    return g_strdup ("");
}

/* ECalModel class methods */

typedef struct {
    const gchar *color;
    GList *uris;
} AssignedColorData;

static const gchar *
ecm_get_color_for_component (ECalModel *model,
                             ECalModelComponent *comp_data)
{
    ESource *source;
    const gchar *color_spec;
    gint i, first_empty = 0;

    static AssignedColorData assigned_colors[] = {
        { "#BECEDD", NULL }, /* 190 206 221     Blue */
        { "#E2F0EF", NULL }, /* 226 240 239     Light Blue */
        { "#C6E2B7", NULL }, /* 198 226 183     Green */
        { "#E2F0D3", NULL }, /* 226 240 211     Light Green */
        { "#E2D4B7", NULL }, /* 226 212 183     Khaki */
        { "#EAEAC1", NULL }, /* 234 234 193     Light Khaki */
        { "#F0B8B7", NULL }, /* 240 184 183     Pink */
        { "#FED4D3", NULL }, /* 254 212 211     Light Pink */
        { "#E2C6E1", NULL }, /* 226 198 225     Purple */
        { "#F0E2EF", NULL }  /* 240 226 239     Light Purple */
    };

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    source = e_client_get_source (E_CLIENT (comp_data->client));
    color_spec = e_source_peek_color_spec (source);
    if (color_spec != NULL) {
        g_free (comp_data->color);
        comp_data->color = g_strdup (color_spec);
        return comp_data->color;
    }

    for (i = 0; i < G_N_ELEMENTS (assigned_colors); i++) {
        GList *l;

        if (assigned_colors[i].uris == NULL) {
            first_empty = i;
            continue;
        }

        for (l = assigned_colors[i].uris; l != NULL; l = l->next) {
            if (!strcmp ((const gchar *) l->data,
                     e_client_get_uri (E_CLIENT (comp_data->client))))
            {
                return assigned_colors[i].color;
            }
        }
    }

    /* return the first unused color */
    assigned_colors[first_empty].uris = g_list_append (
        assigned_colors[first_empty].uris,
        g_strdup (e_client_get_uri (E_CLIENT (comp_data->client))));

    return assigned_colors[first_empty].color;
}

gboolean
e_cal_model_get_confirm_delete (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), FALSE);

    return model->priv->confirm_delete;
}

void
e_cal_model_set_confirm_delete (ECalModel *model,
                                gboolean confirm_delete)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->confirm_delete = confirm_delete;

    g_object_notify (G_OBJECT (model), "confirm-delete");
}

icalcomponent_kind
e_cal_model_get_component_kind (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), ICAL_NO_COMPONENT);

    return model->priv->kind;
}

void
e_cal_model_set_component_kind (ECalModel *model,
                                icalcomponent_kind kind)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->kind = kind;
}

ECalModelFlags
e_cal_model_get_flags (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->flags;
}

void
e_cal_model_set_flags (ECalModel *model,
                       ECalModelFlags flags)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->flags = flags;
}

icaltimezone *
e_cal_model_get_timezone (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    return model->priv->zone;
}

void
e_cal_model_set_timezone (ECalModel *model,
                          icaltimezone *zone)
{
    icaltimezone *old_zone;
    g_return_if_fail (E_IS_CAL_MODEL (model));

    if (model->priv->zone == zone)
        return;

    e_table_model_pre_change (E_TABLE_MODEL (model));
    old_zone = model->priv->zone;
    model->priv->zone = zone;

    /* the timezone affects the times shown for date fields,
     * so we need to redisplay everything */
    e_table_model_changed (E_TABLE_MODEL (model));
    redo_queries (model);

    g_object_notify (G_OBJECT (model), "timezone");
    g_signal_emit (G_OBJECT (model), signals[TIMEZONE_CHANGED], 0,
               old_zone, zone);
}

gboolean
e_cal_model_get_compress_weekend (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), FALSE);

    return model->priv->compress_weekend;
}

void
e_cal_model_set_compress_weekend (ECalModel *model,
                                  gboolean compress_weekend)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->compress_weekend = compress_weekend;

    g_object_notify (G_OBJECT (model), "compress-weekend");
}

void
e_cal_model_set_default_category (ECalModel *model,
                                  const gchar *default_category)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    g_free (model->priv->default_category);
    model->priv->default_category = g_strdup (default_category);
}

gint
e_cal_model_get_default_reminder_interval (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->default_reminder_interval;
}

void
e_cal_model_set_default_reminder_interval (ECalModel *model,
                                           gint default_reminder_interval)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->default_reminder_interval = default_reminder_interval;

    g_object_notify (G_OBJECT (model), "default-reminder-interval");
}

EDurationType
e_cal_model_get_default_reminder_units (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->default_reminder_units;
}

void
e_cal_model_set_default_reminder_units (ECalModel *model,
                                        EDurationType default_reminder_units)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->default_reminder_units = default_reminder_units;

    g_object_notify (G_OBJECT (model), "default-reminder-units");
}

gboolean
e_cal_model_get_use_24_hour_format (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), FALSE);

    return model->priv->use_24_hour_format;
}

void
e_cal_model_set_use_24_hour_format (ECalModel *model,
                                    gboolean use_24_hour_format)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    if (model->priv->use_24_hour_format == use_24_hour_format)
        return;

    e_table_model_pre_change (E_TABLE_MODEL (model));
    model->priv->use_24_hour_format = use_24_hour_format;

    /* Get the views to redraw themselves. */
    e_table_model_changed (E_TABLE_MODEL (model));

    g_object_notify (G_OBJECT (model), "use-24-hour-format");
}

gboolean
e_cal_model_get_use_default_reminder (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), FALSE);

    return model->priv->use_default_reminder;
}

void
e_cal_model_set_use_default_reminder (ECalModel *model,
                                      gboolean use_default_reminder)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->use_default_reminder = use_default_reminder;

    g_object_notify (G_OBJECT (model), "use-default-reminder");
}

gint
e_cal_model_get_week_start_day (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->week_start_day;
}

void
e_cal_model_set_week_start_day (ECalModel *model,
                                gint week_start_day)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));
    g_return_if_fail (week_start_day >= 0);
    g_return_if_fail (week_start_day < 7);

    if (model->priv->week_start_day == week_start_day)
        return;

    model->priv->week_start_day = week_start_day;

    g_object_notify (G_OBJECT (model), "week-start-day");
}

gint
e_cal_model_get_work_day_end_hour (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->work_day_end_hour;
}

void
e_cal_model_set_work_day_end_hour (ECalModel *model,
                                   gint work_day_end_hour)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->work_day_end_hour = work_day_end_hour;

    g_object_notify (G_OBJECT (model), "work-day-end-hour");
}

gint
e_cal_model_get_work_day_end_minute (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->work_day_end_minute;
}

void
e_cal_model_set_work_day_end_minute (ECalModel *model,
                                   gint work_day_end_minute)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->work_day_end_minute = work_day_end_minute;

    g_object_notify (G_OBJECT (model), "work-day-end-minute");
}

gint
e_cal_model_get_work_day_start_hour (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->work_day_start_hour;
}

void
e_cal_model_set_work_day_start_hour (ECalModel *model,
                                   gint work_day_start_hour)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->work_day_start_hour = work_day_start_hour;

    g_object_notify (G_OBJECT (model), "work-day-start-hour");
}

gint
e_cal_model_get_work_day_start_minute (ECalModel *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL (model), 0);

    return model->priv->work_day_start_minute;
}

void
e_cal_model_set_work_day_start_minute (ECalModel *model,
                                   gint work_day_start_minute)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->work_day_start_minute = work_day_start_minute;

    g_object_notify (G_OBJECT (model), "work-day-start-minute");
}

ECalClient *
e_cal_model_get_default_client (ECalModel *model)
{
    ECalModelPrivate *priv;
    ECalModelClient *client_data;

    g_return_val_if_fail (model != NULL, NULL);
    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    /* FIXME Should we force the client to be open? */

    /* we always return a valid ECal, since we rely on it in many places */
    if (priv->default_client)
        return priv->default_client;

    if (!priv->clients)
        return NULL;

    client_data = (ECalModelClient *) priv->clients->data;

    return client_data ? client_data->client : NULL;
}

void
e_cal_model_set_default_client (ECalModel *model,
                                ECalClient *client)
{
    ECalModelPrivate *priv;
    ECalModelClient *client_data;

    g_return_if_fail (E_IS_CAL_MODEL (model));

    if (client != NULL)
        g_return_if_fail (E_IS_CAL_CLIENT (client));

    priv = model->priv;

    if (priv->default_client) {
        client_data = find_client_data (model, priv->default_client);
        if (!client_data) {
            g_warning ("client_data is NULL\n");
        } else {
            if (!client_data->do_query)
                remove_client (model, client_data);
        }
    }

    if (client != NULL) {
        /* Make sure its in the model */
        client_data = add_new_client (model, client, FALSE);

        /* Store the default client */
        priv->default_client = client_data->client;
    } else
        priv->default_client = NULL;

    g_object_notify (G_OBJECT (model), "default-client");
}

GList *
e_cal_model_get_client_list (ECalModel *model)
{
    GList *list = NULL, *l;
    ECalClient *default_client;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    default_client = model->priv->default_client;

    for (l = model->priv->clients; l != NULL; l = l->next) {
        ECalModelClient *client_data = (ECalModelClient *) l->data;

        /* Exclude the default client if we're not querying it. */
        if (client_data->client == default_client && !client_data->do_query)
            continue;

        list = g_list_append (list, client_data->client);
    }

    return list;
}

/**
 * e_cal_model_get_client_for_uri:
 * @model: an #ECalModel
 * @uri: Uri for the client to get.
 */
ECalClient *
e_cal_model_get_client_for_uri (ECalModel *model,
                                const gchar *uri)
{
    GList *l;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);
    g_return_val_if_fail (uri != NULL, NULL);

    for (l = model->priv->clients; l != NULL; l = l->next) {
        ECalModelClient *client_data = (ECalModelClient *) l->data;

        if (!strcmp (uri, e_client_get_uri (E_CLIENT (client_data->client))))
            return client_data->client;
    }

    return NULL;
}

static ECalModelClient *
find_client_data (ECalModel *model,
                  ECalClient *client)
{
    ECalModelPrivate *priv;
    GList *l;

    priv = model->priv;

    for (l = priv->clients; l != NULL; l = l->next) {
        ECalModelClient *client_data = (ECalModelClient *) l->data;

        if (client_data->client == client)
            return client_data;
    }

    return NULL;
}

static ECalModelComponent *
search_by_id_and_client (ECalModelPrivate *priv,
                         ECalClient *client,
                         const ECalComponentId *id)
{
    gint i;

    for (i = 0; i < priv->objects->len; i++) {
        ECalModelComponent *comp_data = g_ptr_array_index (priv->objects, i);

        if (comp_data) {
            const gchar *uid;
            gchar *rid = NULL;
            struct icaltimetype icalrid;
            gboolean has_rid = (id->rid && *id->rid);

            uid = icalcomponent_get_uid (comp_data->icalcomp);
            icalrid = icalcomponent_get_recurrenceid (comp_data->icalcomp);
            if (!icaltime_is_null_time (icalrid))
                rid = icaltime_as_ical_string_r (icalrid);

            if (uid && *uid) {
                if ((!client || comp_data->client == client) && !strcmp (id->uid, uid)) {
                    if (has_rid) {
                        if (!(rid && *rid && !strcmp (rid, id->rid))) {
                            g_free (rid);
                            continue;
                        }
                    }
                    g_free (rid);
                    return comp_data;
                }
            }

            g_free (rid);
        }
    }

    return NULL;
}

static void
remove_all_for_id_and_client (ECalModel *model,
                              ECalClient *client,
                              const ECalComponentId *id)
{
    ECalModelComponent *comp_data;

    while ((comp_data = search_by_id_and_client (model->priv, client, id))) {
        gint pos;
        GSList *list = NULL;

        pos = get_position_in_array (model->priv->objects, comp_data);

        if (!g_ptr_array_remove (model->priv->objects, comp_data))
            continue;

        list = g_slist_append (list, comp_data);
        g_signal_emit (G_OBJECT (model), signals[COMPS_DELETED], 0, list);

        g_slist_free (list);
        g_object_unref (comp_data);

        e_table_model_pre_change (E_TABLE_MODEL (model));
        e_table_model_row_deleted (E_TABLE_MODEL (model), pos);
    }
}

typedef struct {
    ECalClient *client;
    ECalClientView *view;
    ECalModel *model;
    icalcomponent *icalcomp;
} RecurrenceExpansionData;

static void
free_rdata (gpointer data)
{
    RecurrenceExpansionData *rdata = data;

    if (!rdata)
        return;

    g_object_unref (rdata->client);
    g_object_unref (rdata->view);
    g_object_unref (rdata->model);
    g_free (rdata);
}

static gboolean
add_instance_cb (ECalComponent *comp,
                 time_t instance_start,
                 time_t instance_end,
                 gpointer user_data)
{
    ECalModelComponent *comp_data;
    ECalModelPrivate *priv;
    RecurrenceExpansionData *rdata = user_data;
    icaltimetype time;
    ECalComponentDateTime datetime, to_set;
    icaltimezone *zone = NULL;
    ECalComponentId *id;

    g_return_val_if_fail (E_IS_CAL_COMPONENT (comp), TRUE);

    priv = rdata->model->priv;

    id = e_cal_component_get_id (comp);
    remove_all_for_id_and_client (rdata->model, rdata->client, id);
    e_cal_component_free_id (id);

    e_table_model_pre_change (E_TABLE_MODEL (rdata->model));

    /* set the right instance start date to component */
    e_cal_component_get_dtstart (comp, &datetime);
    if (datetime.tzid)
        e_cal_client_get_timezone_sync (rdata->client, datetime.tzid, &zone, NULL, NULL);
    time = icaltime_from_timet_with_zone (instance_start, FALSE, zone ? zone : priv->zone);
    to_set.value = &time;
    to_set.tzid = datetime.tzid;
    e_cal_component_set_dtstart (comp, &to_set);
    e_cal_component_free_datetime (&datetime);

    /* set the right instance end date to component*/
    e_cal_component_get_dtend (comp, &datetime);
    zone = NULL;
    if (datetime.tzid)
        e_cal_client_get_timezone_sync (rdata->client, datetime.tzid, &zone, NULL, NULL);
    time = icaltime_from_timet_with_zone (instance_end, FALSE, zone ? zone : priv->zone);
    to_set.value = &time;
    to_set.tzid = datetime.tzid;
    e_cal_component_set_dtend (comp, &to_set);
    e_cal_component_free_datetime (&datetime);

    comp_data = g_object_new (E_TYPE_CAL_MODEL_COMPONENT, NULL);
    comp_data->client = g_object_ref (rdata->client);
    comp_data->icalcomp = icalcomponent_new_clone (e_cal_component_get_icalcomponent (comp));
    comp_data->instance_start = instance_start;
    comp_data->instance_end = instance_end;

    g_ptr_array_add (priv->objects, comp_data);
    e_table_model_row_inserted (E_TABLE_MODEL (rdata->model), priv->objects->len - 1);

    return TRUE;
}

/* We do this check since the calendar items are downloaded from the server
 * in the open_method, since the default timezone might not be set there. */
static void
ensure_dates_are_in_default_zone (ECalModel *model,
                                  icalcomponent *icalcomp)
{
    icaltimetype dt;
    icaltimezone *zone;

    zone = e_cal_model_get_timezone (model);
    if (!zone)
        return;

    dt = icalcomponent_get_dtstart (icalcomp);
    if (dt.is_utc) {
        dt = icaltime_convert_to_zone (dt, zone);
        icalcomponent_set_dtstart (icalcomp, dt);
    }

    dt = icalcomponent_get_dtend (icalcomp);
    if (dt.is_utc) {
        dt = icaltime_convert_to_zone (dt, zone);
        icalcomponent_set_dtend (icalcomp, dt);
    }
}

static gint
place_master_object_first_cb (gconstpointer p1,
                              gconstpointer p2)
{
    icalcomponent *c1 = (icalcomponent *) p1, *c2 = (icalcomponent *) p2;
    const gchar *uid1, *uid2;
    gint res;

    g_return_val_if_fail (c1 != NULL, 0);
    g_return_val_if_fail (c2 != NULL, 0);

    uid1 = icalcomponent_get_uid (c1);
    uid2 = icalcomponent_get_uid (c2);

    res = g_strcmp0 (uid1, uid2);
    if (res == 0) {
        struct icaltimetype rid1, rid2;

        rid1 = icalcomponent_get_recurrenceid (c1);
        rid2 = icalcomponent_get_recurrenceid (c2);

        if (icaltime_is_null_time (rid1)) {
            if (!icaltime_is_null_time (rid2))
                res = -1;
        } else if (icaltime_is_null_time (rid2)) {
            res = 1;
        } else {
            res = icaltime_compare (rid1, rid2);
        }
    }

    return res;
}

static void client_view_objects_added_cb (ECalClientView *view, const GSList *objects, ECalModel *model);

static void
process_added (ECalClientView *view,
               const GSList *objects,
               ECalModel *model)
{
    ECalModelPrivate *priv;
    const GSList *l;
    GSList *copy;

    priv = model->priv;

    /* order matters, process master object first, then detached instances */
    copy = g_slist_sort (g_slist_copy ((GSList *) objects), place_master_object_first_cb);

    for (l = copy; l; l = l->next) {
        ECalModelComponent *comp_data;
        ECalComponentId *id;
        ECalComponent *comp = e_cal_component_new ();
        ECalClient *client = e_cal_client_view_get_client (view);

        /* This will fail for alarm or VCalendar component */
        if (!e_cal_component_set_icalcomponent (comp, icalcomponent_new_clone (l->data))) {
            g_object_unref (comp);
            continue;
        }

        id = e_cal_component_get_id (comp);

        /* remove the components if they are already present and re-add them */
        remove_all_for_id_and_client (model, client, id);

        e_cal_component_free_id (id);
        g_object_unref (comp);
        ensure_dates_are_in_default_zone (model, l->data);

        if (e_cal_util_component_has_recurrences (l->data) && (priv->flags & E_CAL_MODEL_FLAGS_EXPAND_RECURRENCES)) {
            ECalModelClient *client_data = find_client_data (model, client);

            if (client_data) {
                RecurrenceExpansionData *rdata = g_new0 (RecurrenceExpansionData, 1);
                rdata->client = g_object_ref (client);
                rdata->view = g_object_ref (view);
                rdata->model = g_object_ref (model);

                e_cal_client_generate_instances_for_object (rdata->client, l->data, priv->start, priv->end, client_data->cancellable,
                                        (ECalRecurInstanceFn) add_instance_cb, rdata, free_rdata);
            }
        } else {
            e_table_model_pre_change (E_TABLE_MODEL (model));

            comp_data = g_object_new (E_TYPE_CAL_MODEL_COMPONENT, NULL);
            comp_data->client = g_object_ref (client);
            comp_data->icalcomp = icalcomponent_new_clone (l->data);
            e_cal_model_set_instance_times (comp_data, priv->zone);

            g_ptr_array_add (priv->objects, comp_data);
            e_table_model_row_inserted (E_TABLE_MODEL (model), priv->objects->len - 1);
        }
    }

    g_slist_free (copy);
}

static void
process_modified (ECalClientView *view,
                  const GSList *objects,
                  ECalModel *model)
{
    ECalModelPrivate *priv;
    const GSList *l;
    GSList *list = NULL;

    priv = model->priv;

    /*  re-add only the recurrence objects */
    for (l = objects; l != NULL; l = g_slist_next (l)) {
        if (!e_cal_util_component_is_instance (l->data) && e_cal_util_component_has_recurrences (l->data) && (priv->flags & E_CAL_MODEL_FLAGS_EXPAND_RECURRENCES))
            list = g_slist_prepend (list, l->data);
        else {
            gint pos;
            ECalModelComponent *comp_data;
            ECalComponentId *id;
            ECalComponent *comp = e_cal_component_new ();
            ECalClient *client = e_cal_client_view_get_client (view);

            if (!e_cal_component_set_icalcomponent (comp, icalcomponent_new_clone (l->data))) {
                g_object_unref (comp);
                continue;
            }

            e_table_model_pre_change (E_TABLE_MODEL (model));

            id = e_cal_component_get_id (comp);

            comp_data = search_by_id_and_client (priv, client, id);

            e_cal_component_free_id (id);
            g_object_unref (comp);

            if (!comp_data) {
                /* the modified component is not in the model yet, just skip it */
                continue;
            }

            if (comp_data->icalcomp)
                icalcomponent_free (comp_data->icalcomp);
            if (comp_data->dtstart) {
                g_free (comp_data->dtstart);
                comp_data->dtstart = NULL;
            }
            if (comp_data->dtend) {
                g_free (comp_data->dtend);
                comp_data->dtend = NULL;
            }
            if (comp_data->due) {
                g_free (comp_data->due);
                comp_data->due = NULL;
            }
            if (comp_data->completed) {
                g_free (comp_data->completed);
                comp_data->completed = NULL;
            }
            if (comp_data->created) {
                g_free (comp_data->created);
                comp_data->created = NULL;
            }
            if (comp_data->lastmodified) {
                g_free (comp_data->lastmodified);
                comp_data->lastmodified = NULL;
            }
            if (comp_data->color) {
                g_free (comp_data->color);
                comp_data->color = NULL;
            }

            comp_data->icalcomp = icalcomponent_new_clone (l->data);
            e_cal_model_set_instance_times (comp_data, priv->zone);

            pos = get_position_in_array (priv->objects, comp_data);

            e_table_model_row_changed (E_TABLE_MODEL (model), pos);
        }
    }

    client_view_objects_added_cb (view, list, model);
    g_slist_free (list);
}

static void
process_removed (ECalClientView *view,
                 const GSList *ids,
                 ECalModel *model)
{
    ECalModelPrivate *priv;
    const GSList *l;

    priv = model->priv;

    for (l = ids; l; l = l->next) {
        ECalModelComponent *comp_data = NULL;
        ECalComponentId *id = l->data;
        gint pos;

        /* make sure we remove all objects with this UID */
        while ((comp_data = search_by_id_and_client (priv, e_cal_client_view_get_client (view), id))) {
            GSList *l = NULL;

            pos = get_position_in_array (priv->objects, comp_data);

            if (!g_ptr_array_remove (priv->objects, comp_data))
                continue;

            l = g_slist_append (l, comp_data);
            g_signal_emit (G_OBJECT (model), signals[COMPS_DELETED], 0, l);

            g_slist_free (l);
            g_object_unref (comp_data);

            e_table_model_pre_change (E_TABLE_MODEL (model));
            e_table_model_row_deleted (E_TABLE_MODEL (model), pos);
        }
    }

    /* to notify about changes, because in call of row_deleted there are still all events */
    e_table_model_changed (E_TABLE_MODEL (model));
}

static gpointer
copy_comp_id (gpointer id)
{
    ECalComponentId *comp_id = (ECalComponentId *) id, *copy;

    g_return_val_if_fail (comp_id != NULL, NULL);

    copy = g_new0 (ECalComponentId, 1);
    copy->uid = g_strdup (comp_id->uid);
    copy->rid = g_strdup (comp_id->rid);

    return copy;
}

static void
free_comp_id (gpointer id)
{
    ECalComponentId *comp_id = (ECalComponentId *) id;

    g_return_if_fail (comp_id != NULL);

    g_free (comp_id->uid);
    g_free (comp_id->rid);
    g_free (comp_id);
}

static void
process_event (ECalClientView *view,
               const GSList *objects,
               ECalModel *model,
               void (*process_fn) (ECalClientView *view,
                                   const GSList *objects,
                                   ECalModel *model),
               gboolean *in,
               GHashTable *save_hash,
               gpointer (*copy_fn) (gpointer data),
               void (*free_fn) (gpointer data))
{
    gboolean skip = FALSE;
    const GSList *l;

    g_return_if_fail (save_hash != NULL);

    g_mutex_lock (model->priv->notify_lock);
    if (*in) {
        GSList *save_list = g_hash_table_lookup (save_hash, view);

        skip = TRUE;
        for (l = objects; l; l = l->next) {
            if (l->data)
                save_list = g_slist_append (save_list, copy_fn (l->data));
        }

        g_hash_table_insert (save_hash, g_object_ref (view), save_list);
    } else {
        *in = TRUE;
    }

    g_mutex_unlock (model->priv->notify_lock);

    if (skip)
        return;

    /* do it */
    process_fn (view, objects, model);

    g_mutex_lock (model->priv->notify_lock);
    while (g_hash_table_size (save_hash)) {
        gpointer key = NULL, value = NULL;
        GHashTableIter iter;
        GSList *save_list;

        g_hash_table_iter_init (&iter, save_hash);
        if (!g_hash_table_iter_next (&iter, &key, &value)) {
            g_debug ("%s: Failed to get first item of the save_hash", G_STRFUNC);
            break;
        }

        save_list = value;
        view = g_object_ref (key);

        g_hash_table_remove (save_hash, view);

        g_mutex_unlock (model->priv->notify_lock);

        /* do it */
        process_fn (view, save_list, model);

        for (l = save_list; l; l = l->next) {
            if (l->data) {
                free_fn (l->data);
            }
        }
        g_slist_free (save_list);
        g_object_unref (view);

        g_mutex_lock (model->priv->notify_lock);
    }

    *in = FALSE;
    g_mutex_unlock (model->priv->notify_lock);
}

static void
client_view_objects_added_cb (ECalClientView *view,
                              const GSList *objects,
                              ECalModel *model)
{
    process_event (
        view, objects, model, process_added,
        &model->priv->in_added,
        model->priv->notify_added,
        (gpointer (*)(gpointer)) icalcomponent_new_clone,
        (void (*)(gpointer)) icalcomponent_free);
}

static void
client_view_objects_modified_cb (ECalClientView *view,
                                 const GSList *objects,
                                 ECalModel *model)
{
    process_event (
        view, objects, model, process_modified,
        &model->priv->in_modified,
        model->priv->notify_modified,
        (gpointer (*)(gpointer)) icalcomponent_new_clone,
        (void (*)(gpointer)) icalcomponent_free);
}

static void
client_view_objects_removed_cb (ECalClientView *view,
                                const GSList *ids,
                                ECalModel *model)
{
    process_event (
        view, ids, model, process_removed,
        &model->priv->in_removed,
        model->priv->notify_removed,
        copy_comp_id, free_comp_id);
}

static void
client_view_progress_cb (ECalClientView *view,
                         gint percent,
                         const gchar *message,
                         gpointer user_data)
{
    ECalModel *model = (ECalModel *) user_data;
    ECalClient *client = e_cal_client_view_get_client (view);

    g_return_if_fail (E_IS_CAL_MODEL (model));

    g_signal_emit (
        model, signals[CAL_VIEW_PROGRESS], 0, message,
        percent, e_cal_client_get_source_type (client));
}

static void
client_view_complete_cb (ECalClientView *view,
                         const GError *error,
                         gpointer user_data)
{
    ECalModel *model = (ECalModel *) user_data;
    ECalClient *client = e_cal_client_view_get_client (view);

    g_return_if_fail (E_IS_CAL_MODEL (model));

    g_signal_emit (G_OBJECT (model), signals[CAL_VIEW_COMPLETE], 0, error,
            e_cal_client_get_source_type (client));
}

struct get_view_data
{
    ECalModel *model; /* do not touch this, if cancelled */
    ECalModelClient *client_data; /* do not touch this, if cancelled */
    GCancellable *cancellable;
    guint tries;
};

static void
free_get_view_data (struct get_view_data *gvd)
{
    if (!gvd)
        return;

    g_object_unref (gvd->cancellable);
    g_free (gvd);
}

static gboolean retry_get_view_timeout_cb (gpointer user_data);

static void
get_view_cb (GObject *source_object,
             GAsyncResult *result,
             gpointer user_data)
{
    struct get_view_data *gvd = user_data;
    GError *error = NULL;
    ECalClientView *view = NULL;

    g_return_if_fail (source_object != NULL);
    g_return_if_fail (result != NULL);
    g_return_if_fail (gvd != NULL);
    g_return_if_fail (gvd->model != NULL);
    g_return_if_fail (gvd->client_data != NULL);

    if (!e_cal_client_get_view_finish (E_CAL_CLIENT (source_object), result, &view, &error)) {
        if (g_error_matches (error, E_CLIENT_ERROR, E_CLIENT_ERROR_CANCELLED) ||
            g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
            g_clear_error (&error);

            free_get_view_data (gvd);
            return;
        }

        if (gvd->tries < 10) {
            gvd->tries++;
            g_timeout_add (500, retry_get_view_timeout_cb, gvd);
            return;
        }

        g_debug ("%s: Failed to get view: %s", G_STRFUNC, error ? error->message : "Unknown error");

        g_clear_error (&error);
    } else {
        gvd->client_data->view = view;

        g_signal_connect (gvd->client_data->view, "objects-added", G_CALLBACK (client_view_objects_added_cb), gvd->model);
        g_signal_connect (gvd->client_data->view, "objects-modified", G_CALLBACK (client_view_objects_modified_cb), gvd->model);
        g_signal_connect (gvd->client_data->view, "objects-removed", G_CALLBACK (client_view_objects_removed_cb), gvd->model);
        g_signal_connect (gvd->client_data->view, "progress", G_CALLBACK (client_view_progress_cb), gvd->model);
        g_signal_connect (gvd->client_data->view, "complete", G_CALLBACK (client_view_complete_cb), gvd->model);

        e_cal_client_view_start (gvd->client_data->view, &error);

        if (error) {
            g_debug ("%s: Failed to start view: %s", G_STRFUNC, error->message);
            g_error_free (error);
        }
    }

    free_get_view_data (gvd);
}

static gboolean
retry_get_view_timeout_cb (gpointer user_data)
{
    struct get_view_data *gvd = user_data;

    if (g_cancellable_is_cancelled (gvd->cancellable)) {
        free_get_view_data (gvd);
        return FALSE;
    }

    e_cal_client_get_view (gvd->client_data->client, gvd->model->priv->full_sexp, gvd->cancellable, get_view_cb, gvd);

    return FALSE;
}

static void
update_e_cal_view_for_client (ECalModel *model,
                              ECalModelClient *client_data)
{
    ECalModelPrivate *priv;
    struct get_view_data *gvd;

    priv = model->priv;

    /* Skip if this client has not finished loading yet */
    if (!e_client_is_opened (E_CLIENT (client_data->client)))
        return;

    /* free the previous view, if any */
    if (client_data->view) {
        g_signal_handlers_disconnect_matched (client_data->view, G_SIGNAL_MATCH_DATA,
                              0, 0, NULL, NULL, model);
        g_object_unref (client_data->view);
        client_data->view = NULL;
    }

    /* prepare the view */
    g_return_if_fail (priv->full_sexp != NULL);

    /* Don't create the new query if we won't use it */
    if (!client_data->do_query)
        return;

    if (client_data->cancellable) {
        g_cancellable_cancel (client_data->cancellable);
        g_object_unref (client_data->cancellable);
    }

    client_data->cancellable = g_cancellable_new ();

    gvd = g_new0 (struct get_view_data, 1);
    gvd->client_data = client_data;
    gvd->model = model;
    gvd->tries = 0;
    gvd->cancellable = g_object_ref (client_data->cancellable);

    e_cal_client_get_view (client_data->client, priv->full_sexp, gvd->cancellable, get_view_cb, gvd);
}

void
e_cal_model_update_status_message (ECalModel *model,
                                   const gchar *message,
                                   gdouble percent)
{
    g_return_if_fail (model != NULL);

    g_signal_emit (model, signals[STATUS_MESSAGE], 0, message, percent);
}

static void
backend_died_cb (ECalClient *client,
                 gpointer user_data)
{
    ECalModel *model;

    model = E_CAL_MODEL (user_data);

    e_cal_model_remove_client (model, client);
}

static void
cal_model_retrieve_capabilies_cb (GObject *source_object,
                                  GAsyncResult *result,
                                  gpointer user_data)
{
    ECalClient *client = E_CAL_CLIENT (source_object);
    ECalModel *model = user_data;
    ECalModelClient *client_data;
    gchar *capabilities = NULL;

    g_return_if_fail (client != NULL);
    g_return_if_fail (model != NULL);

    e_client_retrieve_capabilities_finish (
        E_CLIENT (client), result, &capabilities, NULL);
    g_free (capabilities);

    e_cal_model_update_status_message (model, NULL, -1.0);

    client_data = find_client_data (model, client);
    g_return_if_fail (client_data);

    update_e_cal_view_for_client (model, client_data);
}

struct RetryOpenData
{
    EClient *client;
    ECalModel *model;
    GCancellable *cancellable;
};

static void
free_retry_open_data (gpointer data)
{
    struct RetryOpenData *rod = data;

    if (!rod)
        return;

    g_object_unref (rod->client);
    g_object_unref (rod->cancellable);
    g_free (rod);
}

static gboolean cal_model_retry_open_timeout_cb (gpointer user_data);

static void
client_opened_cb (GObject *source_object,
                  GAsyncResult *result,
                  gpointer user_data)
{
    ECalClient *client = E_CAL_CLIENT (source_object);
    ECalModel *model = (ECalModel *) user_data;
    GError *error = NULL;

    e_client_open_finish (E_CLIENT (client), result, &error);

    if (g_error_matches (error, E_CLIENT_ERROR, E_CLIENT_ERROR_CANCELLED) ||
        g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_error_free (error);
        return;
    }

    if (error && g_error_matches (error, E_CLIENT_ERROR, E_CLIENT_ERROR_BUSY)) {
        struct RetryOpenData *rod;

        rod = g_new0 (struct RetryOpenData, 1);
        rod->client = g_object_ref (client);
        rod->model = model;
        rod->cancellable = g_object_ref (model->priv->loading_clients);

        /* postpone for 1/2 of a second, backend is busy now */
        g_timeout_add_full (
            G_PRIORITY_DEFAULT, 500,
            cal_model_retry_open_timeout_cb,
            rod, free_retry_open_data);

        g_error_free (error);

        return;
    }

    if (error != NULL) {
        ESource *source;

        source = e_client_get_source (E_CLIENT (client));
        e_cal_model_remove_client (model, client);
        g_warning (
            "%s: Failed to open '%s': %s",
            G_STRFUNC,
            e_source_peek_name (source),
            error->message);
        g_error_free (error);
        e_cal_model_update_status_message (model, NULL, -1.0);
        return;
    }

    /* to have them ready for later use */
    e_client_retrieve_capabilities (
        E_CLIENT (client), model->priv->loading_clients,
        cal_model_retrieve_capabilies_cb, model);
}

static gboolean
cal_model_retry_open_timeout_cb (gpointer user_data)
{
    struct RetryOpenData *rod = user_data;

    g_return_val_if_fail (rod != NULL, FALSE);
    g_return_val_if_fail (rod->client != NULL, FALSE);
    g_return_val_if_fail (rod->model != NULL, FALSE);

    e_client_open (
        rod->client, TRUE, rod->cancellable,
        client_opened_cb, rod->model);

    return FALSE;
}

static ECalModelClient *
add_new_client (ECalModel *model,
                ECalClient *client,
                gboolean do_query)
{
    ECalModelPrivate *priv;
    ECalModelClient *client_data;

    priv = model->priv;

    /* DEBUG the load state should always be loaded here
    if (e_cal_get_load_state (client) != E_CAL_LOAD_LOADED) {
        g_assert_not_reached ();
    } */

    /* Look to see if we already have this client */
    client_data = find_client_data (model, client);
    if (client_data) {
        if (client_data->do_query)
            return client_data;
        else
            client_data->do_query = do_query;

        goto load;
    }

    client_data = g_new0 (ECalModelClient, 1);
    client_data->client = g_object_ref (client);
    client_data->view = NULL;
    client_data->do_query = do_query;

    priv->clients = g_list_append (priv->clients, client_data);

    g_signal_connect (
        client_data->client, "backend_died",
        G_CALLBACK (backend_died_cb), model);

 load:
    if (e_client_is_opened (E_CLIENT (client))) {
        update_e_cal_view_for_client (model, client_data);
    } else {
        ESource *source;
        const gchar *display_name;
        gchar *msg;

        source = e_client_get_source (E_CLIENT (client));
        display_name = e_source_peek_name (source);
        msg = g_strdup_printf (_("Opening %s"), display_name);
        e_cal_model_update_status_message (model, msg, -1.0);
        g_free (msg);

        e_cal_client_set_default_timezone (client, e_cal_model_get_timezone (model));

        e_client_open (E_CLIENT (client), TRUE, model->priv->loading_clients, client_opened_cb, model);
    }

    return client_data;
}

/**
 * e_cal_model_add_client
 */
void
e_cal_model_add_client (ECalModel *model,
                        ECalClient *client)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));
    g_return_if_fail (E_IS_CAL_CLIENT (client));

    add_new_client (model, client, TRUE);
}

static void
remove_client_objects (ECalModel *model,
                       ECalModelClient *client_data)
{
    gint i;

    /* remove all objects belonging to this client */
    for (i = model->priv->objects->len; i > 0; i--) {
        ECalModelComponent *comp_data = (ECalModelComponent *) g_ptr_array_index (model->priv->objects, i - 1);

        g_return_if_fail (comp_data != NULL);

        if (comp_data->client == client_data->client) {
            GSList *l = NULL;

            g_ptr_array_remove (model->priv->objects, comp_data);

            l = g_slist_append (l, comp_data);
            g_signal_emit (G_OBJECT (model), signals[COMPS_DELETED], 0, l);

            g_slist_free (l);
            g_object_unref (comp_data);

            e_table_model_pre_change (E_TABLE_MODEL (model));
            e_table_model_row_deleted (E_TABLE_MODEL (model), i - 1);
        }
    }

    /* to notify about changes, because in call of row_deleted there are still all events */
    e_table_model_changed (E_TABLE_MODEL (model));
}

static void
remove_client (ECalModel *model,
               ECalModelClient *client_data)
{
    /* FIXME We might not want to disconnect the open signal for the default client */
    g_signal_handlers_disconnect_matched (client_data->client, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, model);
    if (client_data->view)
        g_signal_handlers_disconnect_matched (client_data->view, G_SIGNAL_MATCH_DATA, 0, 0, NULL, NULL, model);

    remove_client_objects (model, client_data);

    /* If this is the default client and we were querying (so it
     * was also a source), keep it around but don't query it */
    if (model->priv->default_client == client_data->client && client_data->do_query) {
        client_data->do_query = FALSE;

        return;
    }

    if (model->priv->default_client == client_data->client)
        model->priv->default_client = NULL;

    /* Remove the client from the list */
    model->priv->clients = g_list_remove (model->priv->clients, client_data);

    /* free all remaining memory */
    g_object_unref (client_data->client);
    if (client_data->view)
        g_object_unref (client_data->view);
    g_free (client_data);
}

/**
 * e_cal_model_remove_client
 */
void
e_cal_model_remove_client (ECalModel *model,
                           ECalClient *client)
{
    ECalModelClient *client_data;

    g_return_if_fail (E_IS_CAL_MODEL (model));
    g_return_if_fail (E_IS_CAL_CLIENT (client));

    client_data = find_client_data (model, client);
    if (client_data)
        remove_client (model, client_data);
}

/**
 * e_cal_model_remove_all_clients
 */
void
e_cal_model_remove_all_clients (ECalModel *model)
{
    ECalModelPrivate *priv;

    g_return_if_fail (E_IS_CAL_MODEL (model));

    priv = model->priv;
    while (priv->clients != NULL) {
        ECalModelClient *client_data = (ECalModelClient *) priv->clients->data;
        remove_client (model, client_data);
    }
}

static GSList *
get_objects_as_list (ECalModel *model)
{
    gint i;
    GSList *l = NULL;
    ECalModelPrivate *priv = model->priv;

    for (i = 0; i < priv->objects->len; i++) {
        ECalModelComponent *comp_data;

        comp_data = g_ptr_array_index (priv->objects, i);
        if (comp_data == NULL) {
            g_warning ("comp_data is null\n");
            continue;
        }

        l = g_slist_prepend (l, comp_data);
    }

    return l;
}

struct cc_data
{
    ECalModel *model;
    EFlag *eflag;
};

static gboolean
cleanup_content_cb (gpointer user_data)
{
    ECalModel *model;
    ECalModelPrivate *priv;
    GSList *slist;
    gint len;
    struct cc_data *data = user_data;

    g_return_val_if_fail (data != NULL, FALSE);
    g_return_val_if_fail (data->model != NULL, FALSE);
    g_return_val_if_fail (data->eflag != NULL, FALSE);

    model = data->model;
    priv = model->priv;

    g_return_val_if_fail (priv != NULL, FALSE);

    e_table_model_pre_change (E_TABLE_MODEL (model));
    len = priv->objects->len;

    slist = get_objects_as_list (model);
    g_ptr_array_set_size (priv->objects, 0);
    g_signal_emit (G_OBJECT (model), signals[COMPS_DELETED], 0, slist);

    e_table_model_rows_deleted (E_TABLE_MODEL (model), 0, len);

    g_slist_foreach (slist, (GFunc) g_object_unref, NULL);
    g_slist_free (slist);

    e_flag_set (data->eflag);

    return FALSE;
}

static void
redo_queries (ECalModel *model)
{
    ECalModelPrivate *priv;
    GList *l;
    struct cc_data data;

    priv = model->priv;

    if (priv->full_sexp)
        g_free (priv->full_sexp);

    if (priv->start != -1 && priv->end != -1) {
        gchar *iso_start, *iso_end;
        const gchar *default_tzloc = NULL;

        iso_start = isodate_from_time_t (priv->start);
        iso_end = isodate_from_time_t (priv->end);

        if (priv->zone && priv->zone != icaltimezone_get_utc_timezone ())
            default_tzloc = icaltimezone_get_location (priv->zone);
        if (!default_tzloc)
            default_tzloc = "";

        if (priv->search_sexp) {
            priv->full_sexp = g_strdup_printf (
                    "(and (occur-in-time-range? (make-time \"%s\") (make-time \"%s\") \"%s\") %s)",
                    iso_start, iso_end, default_tzloc,
                    priv->search_sexp ? priv->search_sexp : "");
        } else {
            priv->full_sexp = g_strdup_printf ("(occur-in-time-range? (make-time \"%s\") (make-time \"%s\") \"%s\")",
                    iso_start, iso_end, default_tzloc);
        }

        g_free (iso_start);
        g_free (iso_end);
    } else if (priv->search_sexp) {
        priv->full_sexp = g_strdup (priv->search_sexp);
    } else {
        priv->full_sexp = g_strdup ("#f");
    }

    /* clean up the current contents, which should be done
     * always from the main thread, because of gtk calls during removal */
    data.model = model;
    data.eflag = e_flag_new ();

    if (!g_main_context_is_owner (g_main_context_default ())) {
        /* function called from other than main thread */
        g_timeout_add (10, cleanup_content_cb, &data);
        e_flag_wait (data.eflag);
    } else {
        cleanup_content_cb (&data);
    }

    e_flag_free (data.eflag);

    /* update the view for all clients */
    for (l = priv->clients; l != NULL; l = l->next) {
        ECalModelClient *client_data;

        client_data = (ECalModelClient *) l->data;
        update_e_cal_view_for_client (model, client_data);
    }
}

void
e_cal_model_get_time_range (ECalModel *model,
                            time_t *start,
                            time_t *end)
{
    ECalModelPrivate *priv;

    g_return_if_fail (model != NULL);
    g_return_if_fail (E_IS_CAL_MODEL (model));

    priv = model->priv;

    if (start)
        *start = priv->start;

    if (end)
        *end = priv->end;
}

void
e_cal_model_set_time_range (ECalModel *model,
                            time_t start,
                            time_t end)
{
    ECalModelPrivate *priv;

    g_return_if_fail (model != NULL);
    g_return_if_fail (E_IS_CAL_MODEL (model));
    g_return_if_fail (start >= 0 && end >= 0);
    g_return_if_fail (start <= end);

    priv = model->priv;

    if (priv->start == start && priv->end == end)
        return;

    priv->start = start;
    priv->end = end;

    g_signal_emit (G_OBJECT (model), signals[TIME_RANGE_CHANGED], 0, start, end);
    redo_queries (model);
}

const gchar *
e_cal_model_get_search_query (ECalModel *model)
{
    ECalModelPrivate *priv;

    g_return_val_if_fail (model != NULL, NULL);
    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    return priv->search_sexp;
}

/**
 * e_cal_model_set_query
 */
void
e_cal_model_set_search_query (ECalModel *model,
                              const gchar *sexp)
{
    ECalModelPrivate *priv;

    g_return_if_fail (E_IS_CAL_MODEL (model));

    priv = model->priv;

    if (!strcmp (sexp ? sexp : "", priv->search_sexp ? priv->search_sexp : ""))
        return;

    if (priv->search_sexp)
        g_free (priv->search_sexp);

    priv->search_sexp = g_strdup (sexp);

    redo_queries (model);
}

/**
 * e_cal_model_set_query
 */
void
e_cal_model_set_search_query_with_time_range (ECalModel *model,
                                              const gchar *sexp,
                                              time_t start,
                                              time_t end)
{
    ECalModelPrivate *priv;
    gboolean do_query = FALSE;

    g_return_if_fail (E_IS_CAL_MODEL (model));

    priv = model->priv;

    if (strcmp (sexp ? sexp : "", priv->search_sexp ? priv->search_sexp : "")) {
        if (priv->search_sexp)
            g_free (priv->search_sexp);

        priv->search_sexp = g_strdup (sexp);
        do_query = TRUE;
    }

    if (!(priv->start == start && priv->end == end)) {
        priv->start = start;
        priv->end = end;
        do_query = TRUE;

        g_signal_emit (G_OBJECT (model), signals[TIME_RANGE_CHANGED], 0, start, end);
    }

    if (do_query)
        redo_queries (model);
}

/**
 * e_cal_model_create_component_with_defaults
 */
icalcomponent *
e_cal_model_create_component_with_defaults (ECalModel *model,
                                            gboolean all_day)
{
    ECalModelPrivate *priv;
    ECalComponent *comp;
    icalcomponent *icalcomp;
    ECalClient *client;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    g_return_val_if_fail (priv->clients != NULL, NULL);

    client = e_cal_model_get_default_client (model);
    if (!client)
        return icalcomponent_new (priv->kind);

    switch (priv->kind) {
    case ICAL_VEVENT_COMPONENT :
        comp = cal_comp_event_new_with_defaults (
            client, all_day,
            e_cal_model_get_use_default_reminder (model),
            e_cal_model_get_default_reminder_interval (model),
            e_cal_model_get_default_reminder_units (model));
        break;
    case ICAL_VTODO_COMPONENT :
        comp = cal_comp_task_new_with_defaults (client);
        break;
    case ICAL_VJOURNAL_COMPONENT :
        comp = cal_comp_memo_new_with_defaults (client);
        break;
    default:
        return NULL;
    }

    if (!comp)
        return icalcomponent_new (priv->kind);

    icalcomp = icalcomponent_new_clone (e_cal_component_get_icalcomponent (comp));
    g_object_unref (comp);

    /* make sure the component has an UID */
    if (!icalcomponent_get_uid (icalcomp)) {
        gchar *uid;

        uid = e_cal_component_gen_uid ();
        icalcomponent_set_uid (icalcomp, uid);

        g_free (uid);
    }

    return icalcomp;
}

/**
 * Returns information about attendees in the component.
 * If there are no attendees, the function returns NULL.
 *
 * The information is like "Status: Accepted: X   Declined: Y  ...".
 *
 * Free returned pointer with g_free.
 **/
gchar *
e_cal_model_get_attendees_status_info (ECalModel *model,
                                       ECalComponent *comp,
                                       ECalClient *cal_client)
{
    struct _values {
        icalparameter_partstat status;
        const gchar *caption;
        gint count;
    } values[] = {
        { ICAL_PARTSTAT_ACCEPTED,    N_("Accepted"),     0 },
        { ICAL_PARTSTAT_DECLINED,    N_("Declined"),     0 },
        { ICAL_PARTSTAT_TENTATIVE,   N_("Tentative"),    0 },
        { ICAL_PARTSTAT_DELEGATED,   N_("Delegated"),    0 },
        { ICAL_PARTSTAT_NEEDSACTION, N_("Needs action"), 0 },
        { ICAL_PARTSTAT_NONE,        N_("Other"),        0 },
        { ICAL_PARTSTAT_X,           NULL,              -1 }
    };

    GSList *attendees = NULL, *a;
    gboolean have = FALSE;
    gchar *res = NULL;
    gint i;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    if (!comp || !e_cal_component_has_attendees (comp) ||
        !itip_organizer_is_user_ex (comp, cal_client, TRUE))
        return NULL;

    e_cal_component_get_attendee_list (comp, &attendees);

    for (a = attendees; a; a = a->next) {
        ECalComponentAttendee *att = a->data;

        if (att && att->cutype == ICAL_CUTYPE_INDIVIDUAL &&
            (att->role == ICAL_ROLE_CHAIR ||
             att->role == ICAL_ROLE_REQPARTICIPANT ||
             att->role == ICAL_ROLE_OPTPARTICIPANT)) {
            have = TRUE;

            for (i = 0; values[i].count != -1; i++) {
                if (att->status == values[i].status || values[i].status == ICAL_PARTSTAT_NONE) {
                    values[i].count++;
                    break;
                }
            }
        }
    }

    if (have) {
        GString *str = g_string_new ("");

        for (i = 0; values[i].count != -1; i++) {
            if (values[i].count > 0) {
                if (str->str && *str->str)
                    g_string_append (str, "   ");

                g_string_append_printf (str, "%s: %d", _(values[i].caption), values[i].count);
            }
        }

        g_string_prepend (str, ": ");

        /* To Translators: 'Status' here means the state of the attendees, the resulting string will be in a form:
         * Status: Accepted: X   Declined: Y   ... */
        g_string_prepend (str, _("Status"));

        res = g_string_free (str, FALSE);
    }

    if (attendees)
        e_cal_component_free_attendee_list (attendees);

    return res;
}

/**
 * e_cal_model_get_color_for_component
 */
const gchar *
e_cal_model_get_color_for_component (ECalModel *model,
                                     ECalModelComponent *comp_data)
{
    ECalModelClass *model_class;
    const gchar *color = NULL;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);
    g_return_val_if_fail (comp_data != NULL, NULL);

    model_class = (ECalModelClass *) G_OBJECT_GET_CLASS (model);
    if (model_class->get_color_for_component != NULL)
        color = model_class->get_color_for_component (model, comp_data);

    if (!color)
        color = ecm_get_color_for_component (model, comp_data);

    return color;
}

/**
 * e_cal_model_get_rgb_color_for_component
 */
gboolean
e_cal_model_get_rgb_color_for_component (ECalModel *model,
                                         ECalModelComponent *comp_data,
                                         gdouble *red,
                                         gdouble *green,
                                         gdouble *blue)
{
    GdkColor gdk_color;
    const gchar *color;

    color = e_cal_model_get_color_for_component (model, comp_data);
    if (color && gdk_color_parse (color, &gdk_color)) {

        if (red)
            *red = ((double) gdk_color.red)/0xffff;
        if (green)
            *green = ((double) gdk_color.green)/0xffff;
        if (blue)
            *blue = ((double) gdk_color.blue)/0xffff;

        return TRUE;
    }

    return FALSE;
}

/**
 * e_cal_model_get_component_at
 */
ECalModelComponent *
e_cal_model_get_component_at (ECalModel *model,
                              gint row)
{
    ECalModelPrivate *priv;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    g_return_val_if_fail (row >= 0 && row < priv->objects->len, NULL);

    return g_ptr_array_index (priv->objects, row);
}

ECalModelComponent *
e_cal_model_get_component_for_uid (ECalModel *model,
                                   const ECalComponentId *id)
{
    ECalModelPrivate *priv;

    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);

    priv = model->priv;

    return search_by_id_and_client (priv, NULL, id);
}

/**
 * e_cal_model_date_value_to_string
 */
gchar *
e_cal_model_date_value_to_string (ECalModel *model,
                                  gconstpointer value)
{
    ECalModelPrivate *priv;
    ECellDateEditValue *dv = (ECellDateEditValue *) value;
    struct icaltimetype tt;
    struct tm tmp_tm;
    gchar buffer[64];

    g_return_val_if_fail (E_IS_CAL_MODEL (model), g_strdup (""));

    priv = model->priv;

    if (!dv)
        return g_strdup ("");

    /* We currently convert all the dates to the current timezone. */
    tt = dv->tt;
    icaltimezone_convert_time (&tt, dv->zone, priv->zone);

    tmp_tm.tm_year = tt.year - 1900;
    tmp_tm.tm_mon = tt.month - 1;
    tmp_tm.tm_mday = tt.day;
    tmp_tm.tm_hour = tt.hour;
    tmp_tm.tm_min = tt.minute;
    tmp_tm.tm_sec = tt.second;
    tmp_tm.tm_isdst = -1;

    tmp_tm.tm_wday = time_day_of_week (tt.day, tt.month - 1, tt.year);

    memset (buffer, 0, sizeof (buffer));
    e_time_format_date_and_time (&tmp_tm, priv->use_24_hour_format,
                     TRUE, FALSE,
                     buffer, sizeof (buffer));
    return g_strdup (buffer);
}

/* FIXME is it still needed ?
static ECellDateEditValue *
copy_ecdv (ECellDateEditValue *ecdv)
{
    ECellDateEditValue *new_ecdv;
 *
    new_ecdv = g_new0 (ECellDateEditValue, 1);
    new_ecdv->tt = ecdv ? ecdv->tt : icaltime_null_time ();
    new_ecdv->zone = ecdv ? ecdv->zone : NULL;
 *
    return new_ecdv;
} */

static void e_cal_model_component_finalize (GObject *object);

static GObjectClass *component_parent_class;

/* Class initialization function for the calendar component object */
static void
e_cal_model_component_class_init (ECalModelComponentClass *class)
{
    GObjectClass *object_class;

    object_class = (GObjectClass *) class;
    g_type_class_add_private (class, sizeof (ECalModelComponentPrivate));

    component_parent_class = g_type_class_peek_parent (class);

    object_class->finalize = e_cal_model_component_finalize;
}

static void
e_cal_model_component_finalize (GObject *object)
{
    ECalModelComponent *comp_data = E_CAL_MODEL_COMPONENT (object);

    if (comp_data->client) {
        g_object_unref (comp_data->client);
        comp_data->client = NULL;
    }
    if (comp_data->icalcomp) {
        icalcomponent_free (comp_data->icalcomp);
        comp_data->icalcomp = NULL;
    }
    if (comp_data->dtstart) {
        g_free (comp_data->dtstart);
        comp_data->dtstart = NULL;
    }
    if (comp_data->dtend) {
        g_free (comp_data->dtend);
        comp_data->dtend = NULL;
    }
    if (comp_data->due) {
        g_free (comp_data->due);
        comp_data->due = NULL;
    }
    if (comp_data->completed) {
        g_free (comp_data->completed);
        comp_data->completed = NULL;
    }
    if (comp_data->created) {
        g_free (comp_data->created);
        comp_data->created = NULL;
    }
    if (comp_data->lastmodified) {
        g_free (comp_data->lastmodified);
        comp_data->lastmodified = NULL;
    }
    if (comp_data->color) {
        g_free (comp_data->color);
        comp_data->color = NULL;
    }

    if (comp_data->priv->categories_str)
        g_string_free (comp_data->priv->categories_str, TRUE);
    comp_data->priv->categories_str = NULL;

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (component_parent_class)->finalize (object);
}

/* Object initialization function for the calendar component object */
static void
e_cal_model_component_init (ECalModelComponent *comp)
{
    comp->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        comp, E_TYPE_CAL_MODEL_COMPONENT, ECalModelComponentPrivate);

    comp->dtstart = NULL;
    comp->dtend = NULL;
    comp->due = NULL;
    comp->completed = NULL;
    comp->created = NULL;
    comp->lastmodified = NULL;
    comp->color = NULL;
    comp->priv->categories_str = NULL;
}

GType
e_cal_model_component_get_type (void)
{
    static GType e_cal_model_component_type = 0;

    if (!e_cal_model_component_type) {
        static GTypeInfo info = {
            sizeof (ECalModelComponentClass),
            (GBaseInitFunc) NULL,
            (GBaseFinalizeFunc) NULL,
            (GClassInitFunc) e_cal_model_component_class_init,
            NULL, NULL,
            sizeof (ECalModelComponent),
            0,
            (GInstanceInitFunc) e_cal_model_component_init
        };
        e_cal_model_component_type = g_type_register_static (G_TYPE_OBJECT, "ECalModelComponent", &info, 0);
    }

    return e_cal_model_component_type;
}

/**
 * e_cal_model_generate_instances_sync
 *
 * cb function is not called with cb_data, but with ECalModelGenerateInstancesData which contains cb_data
 */
void
e_cal_model_generate_instances_sync (ECalModel *model,
                                     time_t start,
                                     time_t end,
                                     ECalRecurInstanceFn cb,
                                     gpointer cb_data)
{
    ECalModelGenerateInstancesData mdata;
    gint i, n;

    n = e_table_model_row_count (E_TABLE_MODEL (model));
    for (i = 0; i < n; i++) {
        ECalModelComponent *comp_data = e_cal_model_get_component_at (model, i);

        mdata.comp_data = comp_data;
        mdata.cb_data = cb_data;

        if (comp_data->instance_start < end && comp_data->instance_end > start)
            e_cal_client_generate_instances_for_object_sync (comp_data->client, comp_data->icalcomp, start, end, cb, &mdata);
    }
}

/**
 * e_cal_model_get_object_array
 */
GPtrArray *
e_cal_model_get_object_array (ECalModel *model)
{
    g_return_val_if_fail (model != NULL, NULL);
    g_return_val_if_fail (E_IS_CAL_MODEL (model), NULL);
    g_return_val_if_fail (model->priv != NULL, NULL);

    return model->priv->objects;
}

void
e_cal_model_set_instance_times (ECalModelComponent *comp_data,
                                const icaltimezone *zone)
{
    struct icaltimetype start_time, end_time;
    icalcomponent_kind kind;

    kind = icalcomponent_isa (comp_data->icalcomp);
    start_time = icalcomponent_get_dtstart (comp_data->icalcomp);
    end_time = icalcomponent_get_dtend (comp_data->icalcomp);

    if (kind == ICAL_VEVENT_COMPONENT) {
        if (start_time.is_date && icaltime_is_null_time (end_time)) {
            /* If end_time is null and it's an all day event,
             * just make start_time = end_time so that end_time
             * will be a valid date
             */
            end_time = start_time;
            icaltime_adjust (&end_time, 1, 0, 0, 0);
            icalcomponent_set_dtend (comp_data->icalcomp, end_time);
        } else if (start_time.is_date && end_time.is_date &&
               (icaltime_compare_date_only (start_time, end_time) == 0)) {
            /* If both DTSTART and DTEND are DATE values, and they are the
             * same day, we add 1 day to DTEND. This means that most
             * events created with the old Evolution behavior will still
             * work OK. */
            icaltime_adjust (&end_time, 1, 0, 0, 0);
            icalcomponent_set_dtend (comp_data->icalcomp, end_time);
        }
    }

    if (start_time.zone)
        zone = start_time.zone;
    else {
        icalparameter *param = NULL;
        icalproperty *prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DTSTART_PROPERTY);

           if (prop)    {
            param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER);

            if (param) {
                const gchar *tzid = NULL;
                icaltimezone *st_zone = NULL;

                tzid = icalparameter_get_tzid (param);
                if (tzid)
                    e_cal_client_get_timezone_sync (comp_data->client, tzid, &st_zone, NULL, NULL);

                if (st_zone)
                    zone = st_zone;
            }
           }
    }

    comp_data->instance_start = icaltime_as_timet_with_zone (start_time, zone);

    if (end_time.zone)
        zone = end_time.zone;
    else {
        icalparameter *param = NULL;
        icalproperty *prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DTSTART_PROPERTY);

           if (prop)    {
            param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER);

            if (param) {
                const gchar *tzid = NULL;
                icaltimezone *end_zone = NULL;

                tzid = icalparameter_get_tzid (param);
                if (tzid)
                    e_cal_client_get_timezone_sync (comp_data->client, tzid, &end_zone, NULL, NULL);

                if (end_zone)
                    zone = end_zone;
            }
           }

    }
    comp_data->instance_end = icaltime_as_timet_with_zone (end_time, zone);
}

/**
 * e_cal_model_set_default_time_func:
 * This function will be used when creating new item from the "click-to-add",
 * when user didn't fill a start date there.
 **/
void
e_cal_model_set_default_time_func (ECalModel *model,
                                   ECalModelDefaultTimeFunc func,
                                   gpointer user_data)
{
    g_return_if_fail (E_IS_CAL_MODEL (model));

    model->priv->get_default_time = func;
    model->priv->get_default_time_user_data = user_data;
}