path: root/calendar/gui/e-cal-model-tasks.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.
 *
 * 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 General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this 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 <math.h>
#include <string.h>
#include <gtk/gtk.h>
#include <glib/gi18n.h>

#include "calendar-config.h"
#include "e-cal-model-tasks.h"
#include "e-cell-date-edit-text.h"
#include "misc.h"

#define E_CAL_MODEL_TASKS_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_CAL_MODEL_TASKS, ECalModelTasksPrivate))

struct _ECalModelTasksPrivate {
    gboolean highlight_due_today;
    gchar *color_due_today;
    gboolean highlight_overdue;
    gchar *color_overdue;
};

enum {
    PROP_0,
    PROP_HIGHLIGHT_DUE_TODAY,
    PROP_COLOR_DUE_TODAY,
    PROP_HIGHLIGHT_OVERDUE,
    PROP_COLOR_OVERDUE
};

/* Forward Declarations */
static void e_cal_model_tasks_table_model_init
                    (ETableModelInterface *iface);

static ETableModelInterface *table_model_parent_interface;

G_DEFINE_TYPE_WITH_CODE (
    ECalModelTasks,
    e_cal_model_tasks,
    E_TYPE_CAL_MODEL,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_TABLE_MODEL,
        e_cal_model_tasks_table_model_init))

/* This makes sure a task is marked as complete.
 * It makes sure the "Date Completed" property is set. If the completed_date
 * is not -1, then that is used, otherwise if the "Date Completed" property
 * is not already set it is set to the current time.
 * It makes sure the percent is set to 100, and that the status is "Completed".
 * Note that this doesn't update the component on the server. */
static void
ensure_task_complete (ECalModelComponent *comp_data,
                      time_t completed_date)
{
    icalproperty *prop;
    gboolean set_completed = TRUE;

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

    /* Date Completed. */
    if (completed_date == -1) {
        if (prop)
            set_completed = FALSE;
        else
            completed_date = time (NULL);
    }

    if (set_completed) {
        icaltimezone *utc_zone;
        struct icaltimetype new_completed;

        /* COMPLETED is stored in UTC. */
        utc_zone = icaltimezone_get_utc_timezone ();
        new_completed = icaltime_from_timet_with_zone (
            completed_date,
            FALSE,
            utc_zone);
        if (prop)
            icalproperty_set_completed (prop, new_completed);
        else {
            prop = icalproperty_new_completed (new_completed);
            icalcomponent_add_property (comp_data->icalcomp, prop);
        }
    }

    /* Percent. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (!prop)
        icalcomponent_add_property (comp_data->icalcomp, icalproperty_new_percentcomplete (100));
    else
        icalproperty_set_percentcomplete (prop, 100);

    /* Status. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop)
        icalproperty_set_status (prop, ICAL_STATUS_COMPLETED);
    else
        icalcomponent_add_property (comp_data->icalcomp, icalproperty_new_status (ICAL_STATUS_COMPLETED));
}

static void
ensure_task_partially_complete (ECalModelComponent *comp_data)
{
    icalproperty *prop;

    /* Date Completed. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_COMPLETED_PROPERTY);
    if (prop) {
        icalcomponent_remove_property (comp_data->icalcomp, prop);
        icalproperty_free (prop);
    }

    /* Percent. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (!prop)
        icalcomponent_add_property (comp_data->icalcomp, icalproperty_new_percentcomplete (50));
    else if (icalproperty_get_percentcomplete (prop) == 0 || icalproperty_get_percentcomplete (prop) == 100)
        icalproperty_set_percentcomplete (prop, 50);

    /* Status. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop)
        icalproperty_set_status (prop, ICAL_STATUS_INPROCESS);
    else
        icalcomponent_add_property (comp_data->icalcomp, icalproperty_new_status (ICAL_STATUS_INPROCESS));
}

/* This makes sure a task is marked as incomplete. It clears the
 * "Date Completed" property. If the percent is set to 100 it removes it,
 * and if the status is "Completed" it sets it to "Needs Action".
 * Note that this doesn't update the component on the client. */
static void
ensure_task_not_complete (ECalModelComponent *comp_data)
{
    icalproperty *prop;

    /* Date Completed. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_COMPLETED_PROPERTY);
    if (prop) {
        icalcomponent_remove_property (comp_data->icalcomp, prop);
        icalproperty_free (prop);
    }

    /* Percent. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (prop) {
        icalcomponent_remove_property (comp_data->icalcomp, prop);
        icalproperty_free (prop);
    }

    /* Status. */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop)
        icalproperty_set_status (prop, ICAL_STATUS_NEEDSACTION);
}

static ECellDateEditValue *
get_completed (ECalModelComponent *comp_data)
{
    struct icaltimetype tt_completed;

    if (!comp_data->completed) {
        icaltimezone *zone;
        icalproperty *prop;

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

        tt_completed = icalproperty_get_completed (prop);
        if (!icaltime_is_valid_time (tt_completed) || icaltime_is_null_time (tt_completed))
            return NULL;

        comp_data->completed = g_new0 (ECellDateEditValue, 1);
        comp_data->completed->tt = tt_completed;

        if (icaltime_get_tzid (tt_completed)
            && e_cal_client_get_timezone_sync (comp_data->client, icaltime_get_tzid (tt_completed), &zone, NULL, NULL))
            comp_data->completed->zone = zone;
        else
            comp_data->completed->zone = NULL;
    }

    return comp_data->completed;
}

static ECellDateEditValue *
get_due (ECalModelComponent *comp_data)
{
    struct icaltimetype tt_due;

    if (!comp_data->due) {
        icaltimezone *zone;
        icalproperty *prop;

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

        tt_due = icalproperty_get_due (prop);
        if (!icaltime_is_valid_time (tt_due) || icaltime_is_null_time (tt_due))
            return NULL;

        comp_data->due = g_new0 (ECellDateEditValue, 1);
        comp_data->due->tt = tt_due;

        if (icaltime_get_tzid (tt_due)
            && e_cal_client_get_timezone_sync (comp_data->client, icaltime_get_tzid (tt_due), &zone, NULL, NULL))
            comp_data->due->zone = zone;
        else
            comp_data->due->zone = NULL;
    }

    return comp_data->due;
}

static gpointer
get_geo (ECalModelComponent *comp_data)
{
    icalproperty *prop;
    struct icalgeotype geo;
    static gchar buf[32];

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_GEO_PROPERTY);
    if (prop) {
        geo = icalproperty_get_geo (prop);
        g_snprintf (
            buf, sizeof (buf), "%g %s, %g %s",
            fabs (geo.lat),
            geo.lat >= 0.0 ? "N" : "S",
            fabs (geo.lon),
            geo.lon >= 0.0 ? "E" : "W");
        return buf;
    }

    return (gpointer) "";
}

static gint
get_percent (ECalModelComponent *comp_data)
{
    icalproperty *prop;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (prop)
        return icalproperty_get_percentcomplete (prop);

    return 0;
}

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

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PRIORITY_PROPERTY);
    if (prop)
        return (gpointer) e_cal_util_priority_to_string (icalproperty_get_priority (prop));

    return (gpointer) "";
}

static gboolean
is_status_canceled (ECalModelComponent *comp_data)
{
    icalproperty *prop;

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

    return prop && icalproperty_get_status (prop) == ICAL_STATUS_CANCELLED;
}

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

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop) {
        switch (icalproperty_get_status (prop)) {
        case ICAL_STATUS_NONE:
            return (gpointer) "";
        case ICAL_STATUS_NEEDSACTION:
            return (gpointer) _("Not Started");
        case ICAL_STATUS_INPROCESS:
            return (gpointer) _("In Progress");
        case ICAL_STATUS_COMPLETED:
            return (gpointer) _("Completed");
        case ICAL_STATUS_CANCELLED:
            return (gpointer) _("Canceled");
        default:
            return (gpointer) "";
        }
    }

    return (gpointer) "";
}

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

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_URL_PROPERTY);
    if (prop)
        return (gpointer) icalproperty_get_url (prop);

    return (gpointer) "";
}

static gboolean
is_complete (ECalModelComponent *comp_data)
{
    icalproperty *prop;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_COMPLETED_PROPERTY);
    if (prop)
        return TRUE;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (prop && icalproperty_get_percentcomplete (prop) == 100)
        return TRUE;

    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop && icalproperty_get_status (prop) == ICAL_STATUS_COMPLETED)
        return TRUE;

    return FALSE;
}

typedef enum {
    E_CAL_MODEL_TASKS_DUE_NEVER,
    E_CAL_MODEL_TASKS_DUE_FUTURE,
    E_CAL_MODEL_TASKS_DUE_TODAY,
    E_CAL_MODEL_TASKS_DUE_OVERDUE,
    E_CAL_MODEL_TASKS_DUE_COMPLETE
} ECalModelTasksDueStatus;

static ECalModelTasksDueStatus
get_due_status (ECalModelTasks *model,
                ECalModelComponent *comp_data)
{
    icalproperty *prop;

    /* First, do we have a due date? */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_DUE_PROPERTY);
    if (!prop)
        return E_CAL_MODEL_TASKS_DUE_NEVER;
    else {
        struct icaltimetype now_tt, due_tt;
        icaltimezone *zone = NULL;

        /* Second, is it already completed? */
        if (is_complete (comp_data))
            return E_CAL_MODEL_TASKS_DUE_COMPLETE;

        /* Third, are we overdue as of right now? */
        due_tt = icalproperty_get_due (prop);
        if (due_tt.is_date) {
            gint cmp;

            now_tt = icaltime_current_time_with_zone (e_cal_model_get_timezone (E_CAL_MODEL (model)));
            cmp = icaltime_compare_date_only (due_tt, now_tt);

            if (cmp < 0)
                return E_CAL_MODEL_TASKS_DUE_OVERDUE;
            else if (cmp == 0)
                return E_CAL_MODEL_TASKS_DUE_TODAY;
            else
                return E_CAL_MODEL_TASKS_DUE_FUTURE;
        } else {
            icalparameter *param;
            const gchar *tzid;

            if (!(param = icalproperty_get_first_parameter (prop, ICAL_TZID_PARAMETER)))
                return E_CAL_MODEL_TASKS_DUE_FUTURE;

            /* Get the current time in the same timezone as the DUE date.*/
            tzid = icalparameter_get_tzid (param);
            e_cal_client_get_timezone_sync (
                comp_data->client, tzid, &zone, NULL, NULL);
            if (zone == NULL)
                return E_CAL_MODEL_TASKS_DUE_FUTURE;

            now_tt = icaltime_current_time_with_zone (zone);

            if (icaltime_compare (due_tt, now_tt) <= 0)
                return E_CAL_MODEL_TASKS_DUE_OVERDUE;
            else
                if (icaltime_compare_date_only (due_tt, now_tt) == 0)
                    return E_CAL_MODEL_TASKS_DUE_TODAY;
                else
                    return E_CAL_MODEL_TASKS_DUE_FUTURE;
        }
    }
}

static gboolean
is_overdue (ECalModelTasks *model,
            ECalModelComponent *comp_data)
{
    switch (get_due_status (model, comp_data)) {
    case E_CAL_MODEL_TASKS_DUE_NEVER:
    case E_CAL_MODEL_TASKS_DUE_FUTURE:
    case E_CAL_MODEL_TASKS_DUE_COMPLETE:
        return FALSE;
    case E_CAL_MODEL_TASKS_DUE_TODAY:
    case E_CAL_MODEL_TASKS_DUE_OVERDUE:
        return TRUE;
    }

    return FALSE;
}

static void
set_completed (ECalModelTasks *model,
               ECalModelComponent *comp_data,
               gconstpointer value)
{
    ECellDateEditValue *dv = (ECellDateEditValue *) value;

    if (!dv)
        ensure_task_not_complete (comp_data);
    else {
        time_t t;

        if (dv->tt.is_date) {
            /* if it's a date, it will be floating,
             * but completed needs a date time value */
            dv->tt.is_date = FALSE;
            t = icaltime_as_timet_with_zone (dv->tt, e_cal_model_get_timezone (E_CAL_MODEL (model)));
        } else {
            /* we assume that COMPLETED is entered in the current timezone,
             * even though it gets stored in UTC */
            t = icaltime_as_timet_with_zone (dv->tt, dv->zone);
        }

        ensure_task_complete (comp_data, t);
    }
}

static void
set_complete (ECalModelComponent *comp_data,
              gconstpointer value)
{
    gint state = GPOINTER_TO_INT (value);

    if (state)
        ensure_task_complete (comp_data, -1);
    else
        ensure_task_not_complete (comp_data);
}

static void
set_due (ECalModel *model,
         ECalModelComponent *comp_data,
         gconstpointer value)
{
    e_cal_model_update_comp_time (model, comp_data, value, ICAL_DUE_PROPERTY, icalproperty_set_due, icalproperty_new_due);
}

/* FIXME: We need to set the "transient_for" property for the dialog, but the
 * model doesn't know anything about the windows.
 */
static void
show_geo_warning (void)
{
    GtkWidget *dialog;

    dialog = gtk_message_dialog_new (
        NULL, 0, GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
        "%s", _("The geographical position must be entered "
        "in the format: \n\n45.436845,125.862501"));
    gtk_widget_show (dialog);
}

static void
set_geo (ECalModelComponent *comp_data,
         const gchar *value)
{
    gdouble latitude, longitude;
    gint matched;
    struct icalgeotype geo;
    icalproperty *prop;

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

    if (string_is_empty (value)) {
        if (prop) {
            icalcomponent_remove_property (comp_data->icalcomp, prop);
            icalproperty_free (prop);
        }
    } else {
        matched = sscanf (value, "%lg , %lg", &latitude, &longitude);
        if (matched != 2)
            show_geo_warning ();

        geo.lat = latitude;
        geo.lon = longitude;
        if (prop)
            icalproperty_set_geo (prop, geo);
        else {
            prop = icalproperty_new_geo (geo);
            icalcomponent_add_property (comp_data->icalcomp, prop);
        }

    }
}

static void
set_status (ECalModelComponent *comp_data,
            const gchar *value)
{
    icalproperty_status status;
    icalproperty *prop;

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

    /* an empty string is the same as 'None' */
    if (!value[0])
        return;

    /* Translators: "None" for task's status */
    if (!e_util_utf8_strcasecmp (value, C_("cal-task-status", "None")))
        return;
    else if (!e_util_utf8_strcasecmp (value, _("Not Started")))
        status = ICAL_STATUS_NEEDSACTION;
    else if (!e_util_utf8_strcasecmp (value, _("In Progress")))
        status = ICAL_STATUS_INPROCESS;
    else if (!e_util_utf8_strcasecmp (value, _("Completed")))
        status = ICAL_STATUS_COMPLETED;
    else if (!e_util_utf8_strcasecmp (value, _("Canceled")))
        status = ICAL_STATUS_CANCELLED;
    else {
        g_warning ("Invalid status: %s\n", value);
        return;
    }

    if (prop)
        icalproperty_set_status (prop, status);
    else {
        prop = icalproperty_new_status (status);
        icalcomponent_add_property (comp_data->icalcomp, prop);
    }

    switch (status) {
    case ICAL_STATUS_NEEDSACTION:
        ensure_task_not_complete (comp_data);
        break;

    case ICAL_STATUS_INPROCESS:
        ensure_task_partially_complete (comp_data);
        break;

    case ICAL_STATUS_CANCELLED:
        ensure_task_not_complete (comp_data);
        /* do this again, because the previous function changed status to NEEDSACTION */
        icalproperty_set_status (prop, status);
        break;

    case ICAL_STATUS_COMPLETED:
        ensure_task_complete (comp_data, -1);
        break;

    /* to make compiler happy */
    /* coverity[dead_error_begin] */
    default:
        break;
    }
}

static void
set_percent (ECalModelComponent *comp_data,
             gconstpointer value)
{
    icalproperty *prop;
    gint percent = GPOINTER_TO_INT (value);

    g_return_if_fail (percent >= -1);
    g_return_if_fail (percent <= 100);

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

    /* A value of -1 means it isn't set */
    if (percent == -1) {
        if (prop) {
            icalcomponent_remove_property (comp_data->icalcomp, prop);
            icalproperty_free (prop);
        }
        ensure_task_not_complete (comp_data);
    } else {
        if (prop)
            icalproperty_set_percentcomplete (prop, percent);
        else {
            prop = icalproperty_new_percentcomplete (percent);
            icalcomponent_add_property (comp_data->icalcomp, prop);
        }

        if (percent == 100)
            ensure_task_complete (comp_data, -1);
        else {
            prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_COMPLETED_PROPERTY);
            if (prop) {
                icalcomponent_remove_property (comp_data->icalcomp, prop);
                icalproperty_free (prop);
            }

            if (percent > 0)
                set_status (comp_data, _("In Progress"));
        }
    }

}

static void
set_priority (ECalModelComponent *comp_data,
              const gchar *value)
{
    icalproperty *prop;
    gint priority;

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

    priority = e_cal_util_priority_from_string (value);
    if (priority == -1) {
        g_warning ("Invalid priority");
        priority = 0;
    }

    if (prop)
        icalproperty_set_priority (prop, priority);
    else {
        prop = icalproperty_new_priority (priority);
        icalcomponent_add_property (comp_data->icalcomp, prop);
    }
}

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

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

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

/**
 * commit_component_changes
 * @comp_data: Component of our interest, which has been changed.
 *
 * Commits changes to the backend calendar of the component.
 **/
static void
commit_component_changes (ECalModelComponent *comp_data)
{
    GError *error = NULL;

    g_return_if_fail (comp_data != NULL);

    /* FIXME ask about mod type */
    e_cal_client_modify_object_sync (
        comp_data->client, comp_data->icalcomp,
        CALOBJ_MOD_ALL, NULL, &error);

    if (error != NULL) {
        g_warning (
            G_STRLOC ": Could not modify the object! %s",
            error->message);

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

static void
cal_model_tasks_set_property (GObject *object,
                              guint property_id,
                              const GValue *value,
                              GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_HIGHLIGHT_DUE_TODAY:
            e_cal_model_tasks_set_highlight_due_today (
                E_CAL_MODEL_TASKS (object),
                g_value_get_boolean (value));
            return;

        case PROP_COLOR_DUE_TODAY:
            e_cal_model_tasks_set_color_due_today (
                E_CAL_MODEL_TASKS (object),
                g_value_get_string (value));
            return;

        case PROP_HIGHLIGHT_OVERDUE:
            e_cal_model_tasks_set_highlight_overdue (
                E_CAL_MODEL_TASKS (object),
                g_value_get_boolean (value));
            return;

        case PROP_COLOR_OVERDUE:
            e_cal_model_tasks_set_color_overdue (
                E_CAL_MODEL_TASKS (object),
                g_value_get_string (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cal_model_tasks_get_property (GObject *object,
                              guint property_id,
                              GValue *value,
                              GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_HIGHLIGHT_DUE_TODAY:
            g_value_set_boolean (
                value,
                e_cal_model_tasks_get_highlight_due_today (
                E_CAL_MODEL_TASKS (object)));
            return;

        case PROP_COLOR_DUE_TODAY:
            g_value_set_string (
                value,
                e_cal_model_tasks_get_color_due_today (
                E_CAL_MODEL_TASKS (object)));
            return;

        case PROP_HIGHLIGHT_OVERDUE:
            g_value_set_boolean (
                value,
                e_cal_model_tasks_get_highlight_overdue (
                E_CAL_MODEL_TASKS (object)));
            return;

        case PROP_COLOR_OVERDUE:
            g_value_set_string (
                value,
                e_cal_model_tasks_get_color_overdue (
                E_CAL_MODEL_TASKS (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
cal_model_tasks_finalize (GObject *object)
{
    ECalModelTasksPrivate *priv;

    priv = E_CAL_MODEL_TASKS_GET_PRIVATE (object);

    g_free (priv->color_due_today);
    g_free (priv->color_overdue);

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

static const gchar *
cal_model_tasks_get_color_for_component (ECalModel *model,
                                         ECalModelComponent *comp_data)
{
    ECalModelTasks *tasks;

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

    tasks = E_CAL_MODEL_TASKS (model);

    /* XXX ECalModel's get_color_for_component() method should really
     *     get a GdkColor instead of a color specification string. */

    switch (get_due_status (tasks, comp_data)) {
    case E_CAL_MODEL_TASKS_DUE_TODAY:
        if (!e_cal_model_tasks_get_highlight_due_today (tasks))
            break;
        return e_cal_model_tasks_get_color_due_today (tasks);
    case E_CAL_MODEL_TASKS_DUE_OVERDUE:
        if (!e_cal_model_tasks_get_highlight_overdue (tasks))
            break;
        return e_cal_model_tasks_get_color_overdue (tasks);
    case E_CAL_MODEL_TASKS_DUE_NEVER:
    case E_CAL_MODEL_TASKS_DUE_FUTURE:
    case E_CAL_MODEL_TASKS_DUE_COMPLETE:
        break;
    }

    return E_CAL_MODEL_CLASS (e_cal_model_tasks_parent_class)->
        get_color_for_component (model, comp_data);
}

static void
cal_model_tasks_fill_component_from_model (ECalModel *model,
                                           ECalModelComponent *comp_data,
                                           ETableModel *source_model,
                                           gint row)
{
    gpointer value;

    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));
    g_return_if_fail (comp_data != NULL);
    g_return_if_fail (E_IS_TABLE_MODEL (source_model));

    /* This just makes sure if anything indicates completion, all
     * three fields do or if percent is 0, status is sane */

    value = e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_COMPLETED, row);
    set_completed ((ECalModelTasks *) model, comp_data, value);
    if (!value) {
        value = e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_PERCENT, row);
        set_percent (comp_data, value);
        if (GPOINTER_TO_INT (value) != 100 && GPOINTER_TO_INT (value) != 0)
            set_status (comp_data, e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_STATUS, row));
    }

    set_due (
        model, comp_data,
        e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_DUE, row));
    set_geo (
        comp_data,
        e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_GEO, row));
    set_priority (
        comp_data,
        e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_PRIORITY, row));
    set_url (
        comp_data,
        e_table_model_value_at (source_model, E_CAL_MODEL_TASKS_FIELD_URL, row));
}

static gint
cal_model_tasks_column_count (ETableModel *etm)
{
    return E_CAL_MODEL_TASKS_FIELD_LAST;
}

static gpointer
cal_model_tasks_value_at (ETableModel *etm,
                          gint col,
                          gint row)
{
    ECalModelComponent *comp_data;
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), NULL);

    g_return_val_if_fail (col >= 0 && (col < E_CAL_MODEL_TASKS_FIELD_LAST || col == E_CAL_MODEL_TASKS_FIELD_STRIKEOUT), NULL);
    g_return_val_if_fail (row >= 0 && row < e_table_model_row_count (etm), NULL);

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->value_at (etm, col, row);

    comp_data = e_cal_model_get_component_at (E_CAL_MODEL (model), row);
    if (!comp_data)
        return (gpointer) "";

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
        return get_completed (comp_data);
    case E_CAL_MODEL_TASKS_FIELD_STRIKEOUT :
        return GINT_TO_POINTER (is_status_canceled (comp_data) || is_complete (comp_data));
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
        return GINT_TO_POINTER (is_complete (comp_data));
    case E_CAL_MODEL_TASKS_FIELD_DUE :
        return get_due (comp_data);
    case E_CAL_MODEL_TASKS_FIELD_GEO :
        return get_geo (comp_data);
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        return GINT_TO_POINTER (is_overdue (model, comp_data));
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
        return GINT_TO_POINTER (get_percent (comp_data));
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
        return get_priority (comp_data);
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
        return get_status (comp_data);
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return get_url (comp_data);
    }

    return (gpointer) "";
}

static void
cal_model_tasks_set_value_at (ETableModel *etm,
                              gint col,
                              gint row,
                              gconstpointer value)
{
    ECalModelComponent *comp_data;
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));

    g_return_if_fail (col >= 0 && col < E_CAL_MODEL_TASKS_FIELD_LAST);
    g_return_if_fail (row >= 0 && row < e_table_model_row_count (etm));

    if (col < E_CAL_MODEL_FIELD_LAST) {
        table_model_parent_interface->set_value_at (etm, col, row, value);
        return;
    }

    comp_data = e_cal_model_get_component_at (E_CAL_MODEL (model), row);
    if (!comp_data)
        return;

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
        set_completed (model, comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
        set_complete (comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_DUE :
        set_due ((ECalModel *) model, comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_GEO :
        set_geo (comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
        set_percent (comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
        set_priority (comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
        set_status (comp_data, value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_URL :
        set_url (comp_data, value);
        break;
    }

    commit_component_changes (comp_data);
}

static gboolean
cal_model_tasks_is_cell_editable (ETableModel *etm,
                                  gint col,
                                  gint row)
{
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), FALSE);

    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_TASKS_FIELD_LAST, FALSE);
    g_return_val_if_fail (row >= -1 || (row >= 0 && row < e_table_model_row_count (etm)), FALSE);

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->is_cell_editable (etm, col, row);

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

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return TRUE;
    }

    return FALSE;
}

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

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->duplicate_value (etm, col, value);

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return g_strdup (value);
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
        if (value) {
            ECellDateEditValue *dv, *orig_dv;

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

            return dv;
        }
        break;

    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        return (gpointer) value;
    }

    return NULL;
}

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

    if (col < E_CAL_MODEL_FIELD_LAST) {
        table_model_parent_interface->free_value (etm, col, value);
        return;
    }

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        if (value)
            g_free (value);
        break;
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        break;
    }
}

static gpointer
cal_model_tasks_initialize_value (ETableModel *etm,
                                  gint col)
{
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), NULL);
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_TASKS_FIELD_LAST, NULL);

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->initialize_value (etm, col);

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return g_strdup ("");
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        return NULL;
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
        return GINT_TO_POINTER (-1);
    }

    return NULL;
}

static gboolean
cal_model_tasks_value_is_empty (ETableModel *etm,
                                gint col,
                                gconstpointer value)
{
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), TRUE);
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_TASKS_FIELD_LAST, TRUE);

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->value_is_empty (etm, col, value);

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return string_is_empty (value);
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
        return value ? FALSE : TRUE;
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
        return (GPOINTER_TO_INT (value) < 0) ? TRUE : FALSE;
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        return TRUE;
    }

    return TRUE;
}

static gchar *
cal_model_tasks_value_to_string (ETableModel *etm,
                                 gint col,
                                 gconstpointer value)
{
    ECalModelTasks *model = (ECalModelTasks *) etm;

    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), g_strdup (""));
    g_return_val_if_fail (col >= 0 && col < E_CAL_MODEL_TASKS_FIELD_LAST, g_strdup (""));

    if (col < E_CAL_MODEL_FIELD_LAST)
        return table_model_parent_interface->value_to_string (etm, col, value);

    switch (col) {
    case E_CAL_MODEL_TASKS_FIELD_GEO :
    case E_CAL_MODEL_TASKS_FIELD_PRIORITY :
    case E_CAL_MODEL_TASKS_FIELD_STATUS :
    case E_CAL_MODEL_TASKS_FIELD_URL :
        return g_strdup (value);
    case E_CAL_MODEL_TASKS_FIELD_COMPLETED :
    case E_CAL_MODEL_TASKS_FIELD_DUE :
        return e_cal_model_date_value_to_string (E_CAL_MODEL (model), value);
    case E_CAL_MODEL_TASKS_FIELD_COMPLETE :
    case E_CAL_MODEL_TASKS_FIELD_OVERDUE :
        return g_strdup (value ? _("Yes") : _("No"));
    case E_CAL_MODEL_TASKS_FIELD_PERCENT :
        if (GPOINTER_TO_INT (value) < 0)
            return g_strdup ("N/A");
        else
            return g_strdup_printf ("%i%%", GPOINTER_TO_INT (value));
    }

    return g_strdup ("");
}

static void
e_cal_model_tasks_class_init (ECalModelTasksClass *class)
{
    GObjectClass *object_class;
    ECalModelClass *cal_model_class;

    g_type_class_add_private (class, sizeof (ECalModelTasksPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = cal_model_tasks_set_property;
    object_class->get_property = cal_model_tasks_get_property;
    object_class->finalize = cal_model_tasks_finalize;

    cal_model_class = E_CAL_MODEL_CLASS (class);
    cal_model_class->get_color_for_component = cal_model_tasks_get_color_for_component;
    cal_model_class->fill_component_from_model = cal_model_tasks_fill_component_from_model;

    g_object_class_install_property (
        object_class,
        PROP_HIGHLIGHT_DUE_TODAY,
        g_param_spec_boolean (
            "highlight-due-today",
            "Highlight Due Today",
            NULL,
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_COLOR_DUE_TODAY,
        g_param_spec_string (
            "color-due-today",
            "Color Due Today",
            NULL,
            "#1e90ff",
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_HIGHLIGHT_OVERDUE,
        g_param_spec_boolean (
            "highlight-overdue",
            "Highlight Overdue",
            NULL,
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_COLOR_OVERDUE,
        g_param_spec_string (
            "color-overdue",
            "Color Overdue",
            NULL,
            "#ff0000",
            G_PARAM_READWRITE));
}

static void
e_cal_model_tasks_table_model_init (ETableModelInterface *iface)
{
    table_model_parent_interface =
        g_type_interface_peek_parent (iface);

    iface->column_count = cal_model_tasks_column_count;

    iface->value_at = cal_model_tasks_value_at;
    iface->set_value_at = cal_model_tasks_set_value_at;
    iface->is_cell_editable = cal_model_tasks_is_cell_editable;

    iface->duplicate_value = cal_model_tasks_duplicate_value;
    iface->free_value = cal_model_tasks_free_value;
    iface->initialize_value = cal_model_tasks_initialize_value;
    iface->value_is_empty = cal_model_tasks_value_is_empty;
    iface->value_to_string = cal_model_tasks_value_to_string;
}

static void
e_cal_model_tasks_init (ECalModelTasks *model)
{
    model->priv = E_CAL_MODEL_TASKS_GET_PRIVATE (model);

    model->priv->highlight_due_today = TRUE;
    model->priv->highlight_overdue = TRUE;

    e_cal_model_set_component_kind (
        E_CAL_MODEL (model), ICAL_VTODO_COMPONENT);
}

ECalModel *
e_cal_model_tasks_new (ESourceRegistry *registry)
{
    g_return_val_if_fail (E_IS_SOURCE_REGISTRY (registry), NULL);

    return g_object_new (
        E_TYPE_CAL_MODEL_TASKS,
        "registry", registry, NULL);
}

gboolean
e_cal_model_tasks_get_highlight_due_today (ECalModelTasks *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), FALSE);

    return model->priv->highlight_due_today;
}

void
e_cal_model_tasks_set_highlight_due_today (ECalModelTasks *model,
                                           gboolean highlight)
{
    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));

    if (model->priv->highlight_due_today == highlight)
        return;

    model->priv->highlight_due_today = highlight;

    g_object_notify (G_OBJECT (model), "highlight-due-today");
}

const gchar *
e_cal_model_tasks_get_color_due_today (ECalModelTasks *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), NULL);

    return model->priv->color_due_today;
}

void
e_cal_model_tasks_set_color_due_today (ECalModelTasks *model,
                                       const gchar *color_due_today)
{
    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));
    g_return_if_fail (color_due_today != NULL);

    if (g_strcmp0 (model->priv->color_due_today, color_due_today) == 0)
        return;

    g_free (model->priv->color_due_today);
    model->priv->color_due_today = g_strdup (color_due_today);

    g_object_notify (G_OBJECT (model), "color-due-today");
}

gboolean
e_cal_model_tasks_get_highlight_overdue (ECalModelTasks *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), FALSE);

    return model->priv->highlight_overdue;
}

void
e_cal_model_tasks_set_highlight_overdue (ECalModelTasks *model,
                                         gboolean highlight)
{
    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));

    if (model->priv->highlight_overdue == highlight)
        return;

    model->priv->highlight_overdue = highlight;

    g_object_notify (G_OBJECT (model), "highlight-overdue");
}

const gchar *
e_cal_model_tasks_get_color_overdue (ECalModelTasks *model)
{
    g_return_val_if_fail (E_IS_CAL_MODEL_TASKS (model), NULL);

    return model->priv->color_overdue;
}

void
e_cal_model_tasks_set_color_overdue (ECalModelTasks *model,
                                     const gchar *color_overdue)
{
    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));
    g_return_if_fail (color_overdue != NULL);

    if (g_strcmp0 (model->priv->color_overdue, color_overdue) == 0)
        return;

    g_free (model->priv->color_overdue);
    model->priv->color_overdue = g_strdup (color_overdue);

    g_object_notify (G_OBJECT (model), "color-overdue");
}

/**
 * e_cal_model_tasks_mark_comp_complete
 * @model: Currently not used...
 * @comp_data: Component of our interest
 *
 * Marks component as complete and commits changes to the calendar backend.
 **/
void
e_cal_model_tasks_mark_comp_complete (ECalModelTasks *model,
                                      ECalModelComponent *comp_data)
{
    g_return_if_fail (model != NULL);
    g_return_if_fail (comp_data != NULL);

    /* we will receive changes when committed, so don't do this */
    /*e_table_model_pre_change (E_TABLE_MODEL (model));*/

    ensure_task_complete (comp_data, -1);

    /*e_table_model_row_changed (E_TABLE_MODEL (model), model_row);*/

    commit_component_changes (comp_data);
}

/**
 * e_cal_model_tasks_mark_comp_incomplete
 * @model: Currently not used...
 * @comp_data: Component of our interest
 *
 * Marks component as incomplete and commits changes to the calendar backend.
 **/
void
e_cal_model_tasks_mark_comp_incomplete (ECalModelTasks *model,
                                        ECalModelComponent *comp_data)
{
    icalproperty *prop,*prop1;

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

    /* we will receive changes when committed, so don't do this */
    /*e_table_model_pre_change (E_TABLE_MODEL (model));*/

    /* Status */
    prop = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_STATUS_PROPERTY);
    if (prop)
        icalproperty_set_status (prop, ICAL_STATUS_NEEDSACTION);
    else
        icalcomponent_add_property (comp_data->icalcomp, icalproperty_new_status (ICAL_STATUS_NEEDSACTION));

    /*complete property*/
    prop1 = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_COMPLETED_PROPERTY);
    if (prop1) {
        icalcomponent_remove_property (comp_data->icalcomp, prop1);
        icalproperty_free (prop1);
    }

    /* Percent. */
    prop1 = icalcomponent_get_first_property (comp_data->icalcomp, ICAL_PERCENTCOMPLETE_PROPERTY);
    if (prop1) {
        icalcomponent_remove_property (comp_data->icalcomp, prop1);
        icalproperty_free (prop1);
    }

    /*e_table_model_row_changed (E_TABLE_MODEL (model), model_row);*/

    commit_component_changes (comp_data);
}

void
e_cal_model_tasks_update_due_tasks (ECalModelTasks *model)
{
    gint row, row_count;
    ECalModelComponent *comp_data;
    ECalModelTasksDueStatus status;

    g_return_if_fail (E_IS_CAL_MODEL_TASKS (model));

    row_count = e_table_model_row_count (E_TABLE_MODEL (model));

    for (row = 0; row < row_count; row++)
    {
        comp_data = e_cal_model_get_component_at (E_CAL_MODEL (model), row);
        status = get_due_status (E_CAL_MODEL_TASKS (model), comp_data);
        if ((status == E_CAL_MODEL_TASKS_DUE_TODAY) || (status == E_CAL_MODEL_TASKS_DUE_OVERDUE))
        {
            e_table_model_pre_change (E_TABLE_MODEL (model));
            e_table_model_row_changed (E_TABLE_MODEL (model), row);
        }
    }
}