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/*
 * e-task-shell-sidebar.c
 *
 * 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/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

#include "e-task-shell-sidebar.h"

#include <string.h>
#include <glib/gi18n.h>
#include <libecal/e-cal.h>

#include "e-util/e-alert-dialog.h"
#include "e-util/e-util.h"
#include "calendar/common/authentication.h"
#include "calendar/gui/calendar-config.h"
#include "calendar/gui/e-task-list-selector.h"
#include "calendar/gui/misc.h"

#include "e-task-shell-backend.h"
#include "e-task-shell-view.h"

#define E_TASK_SHELL_SIDEBAR_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_TASK_SHELL_SIDEBAR, ETaskShellSidebarPrivate))

struct _ETaskShellSidebarPrivate {
    GtkWidget *selector;

    /* UID -> Client */
    GHashTable *client_table;
};

enum {
    PROP_0,
    PROP_SELECTOR
};

enum {
    CLIENT_ADDED,
    CLIENT_REMOVED,
    STATUS_MESSAGE,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];
static GType task_shell_sidebar_type;

static void
task_shell_sidebar_emit_client_added (ETaskShellSidebar *task_shell_sidebar,
                                      ECal *client)
{
    guint signal_id = signals[CLIENT_ADDED];

    g_signal_emit (task_shell_sidebar, signal_id, 0, client);
}

static void
task_shell_sidebar_emit_client_removed (ETaskShellSidebar *task_shell_sidebar,
                                        ECal *client)
{
    guint signal_id = signals[CLIENT_REMOVED];

    g_signal_emit (task_shell_sidebar, signal_id, 0, client);
}

static void
task_shell_sidebar_emit_status_message (ETaskShellSidebar *task_shell_sidebar,
                                        const gchar *status_message)
{
    guint signal_id = signals[STATUS_MESSAGE];

    g_signal_emit (task_shell_sidebar, signal_id, 0, status_message, -1.0);
}

static void
task_shell_sidebar_backend_died_cb (ETaskShellSidebar *task_shell_sidebar,
                                    ECal *client)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellSidebar *shell_sidebar;
    GHashTable *client_table;
    ESource *source;
    const gchar *uid;

    client_table = task_shell_sidebar->priv->client_table;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_window = e_shell_view_get_shell_window (shell_view);

    source = e_cal_get_source (client);
    uid = e_source_peek_uid (source);

    g_object_ref (source);

    g_hash_table_remove (client_table, uid);
    task_shell_sidebar_emit_status_message (task_shell_sidebar, NULL);

    e_alert_run_dialog_for_args (
        GTK_WINDOW (shell_window),
        "calendar:tasks-crashed", NULL);

    g_object_unref (source);
}

static void
task_shell_sidebar_backend_error_cb (ETaskShellSidebar *task_shell_sidebar,
                                     const gchar *message,
                                     ECal *client)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellSidebar *shell_sidebar;
    GtkWidget *dialog;
    const gchar *uri;
    gchar *uri_no_passwd;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_window = e_shell_view_get_shell_window (shell_view);

    uri = e_cal_get_uri (client);
    uri_no_passwd = get_uri_without_password (uri);

    dialog = gtk_message_dialog_new (
        GTK_WINDOW (shell_window),
        GTK_DIALOG_DESTROY_WITH_PARENT,
        GTK_MESSAGE_ERROR, GTK_BUTTONS_OK,
        _("Error on %s\n%s"),
        uri_no_passwd, message);

    gtk_dialog_run (GTK_DIALOG (dialog));
    gtk_widget_destroy (dialog);

    g_free (uri_no_passwd);
}

static void
task_shell_sidebar_client_opened_cb (ETaskShellSidebar *task_shell_sidebar,
                                     ECalendarStatus status,
                                     ECal *client)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellSidebar *shell_sidebar;
    ESource *source;

    source = e_cal_get_source (client);

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_window = e_shell_view_get_shell_window (shell_view);

    if (status == E_CALENDAR_STATUS_AUTHENTICATION_FAILED ||
        status == E_CALENDAR_STATUS_AUTHENTICATION_REQUIRED)
        auth_cal_forget_password (client);

    switch (status) {
        case E_CALENDAR_STATUS_OK:
            g_signal_handlers_disconnect_matched (
                client, G_SIGNAL_MATCH_FUNC, 0, 0, NULL,
                task_shell_sidebar_client_opened_cb, NULL);

            task_shell_sidebar_emit_status_message (
                task_shell_sidebar, _("Loading tasks"));
            task_shell_sidebar_emit_client_added (
                task_shell_sidebar, client);
            task_shell_sidebar_emit_status_message (
                task_shell_sidebar, NULL);
            break;

        case E_CALENDAR_STATUS_AUTHENTICATION_FAILED:
            e_cal_open_async (client, FALSE);
            break;

        case E_CALENDAR_STATUS_BUSY:
            break;

        case E_CALENDAR_STATUS_REPOSITORY_OFFLINE:
            e_alert_run_dialog_for_args (
                GTK_WINDOW (shell_window),
                "calendar:prompt-no-contents-offline-tasks",
                NULL);
            break;

        default:
            task_shell_sidebar_emit_client_removed (
                task_shell_sidebar, client);
            break;
    }
}

static void
task_shell_sidebar_row_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                   GtkTreePath *tree_path,
                                   GtkTreeIter *tree_iter,
                                   GtkTreeModel *tree_model)
{
    ESourceSelector *selector;
    ESource *source;

    /* XXX ESourceSelector's underlying tree store has only one
     *     column: ESource objects.  While we're not supposed to
     *     know this, listening for "row-changed" signals from
     *     the model is easier to deal with than the selector's
     *     "selection-changed" signal, which doesn't tell you
     *     _which_ row changed. */

    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);
    gtk_tree_model_get (tree_model, tree_iter, 0, &source, -1);

    /* XXX This signal gets emitted a lot while the model is being
     *     rebuilt, during which time we won't get a valid ESource.
     *     ESourceSelector should probably block this signal while
     *     rebuilding the model, but we'll be forgiving and not
     *     emit a warning. */
    if (!E_IS_SOURCE (source))
        return;

    if (e_source_selector_source_is_selected (selector, source))
        e_task_shell_sidebar_add_source (task_shell_sidebar, source);
    else
        e_task_shell_sidebar_remove_source (task_shell_sidebar, source);
}

static void
task_shell_sidebar_selection_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                         ESourceSelector *selector)
{
    GSList *list, *iter;

    /* This signal is emitted less frequently than "row-changed",
     * especially when the model is being rebuilt.  So we'll take
     * it easy on poor GConf. */

    list = e_source_selector_get_selection (selector);

    for (iter = list; iter != NULL; iter = iter->next) {
        ESource *source = iter->data;

        iter->data = (gpointer) e_source_peek_uid (source);
        g_object_unref (source);
    }

    calendar_config_set_tasks_selected (list);

    g_slist_free (list);
}

static void
task_shell_sidebar_primary_selection_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                                 ESourceSelector *selector)
{
    EShell *shell;
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellSidebar *shell_sidebar;
    EShellSettings *shell_settings;
    ESource *source;

    /* XXX ESourceSelector needs a "primary-selection-uid" property
     *     so we can just bind the property with GConfBridge. */

    source = e_source_selector_peek_primary_selection (selector);
    if (source == NULL)
        return;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_window = e_shell_view_get_shell_window (shell_view);

    shell = e_shell_window_get_shell (shell_window);
    shell_settings = e_shell_get_shell_settings (shell);

    e_shell_settings_set_string (
        shell_settings, "cal-primary-task-list",
        e_source_peek_uid (source));
}

static void
task_shell_sidebar_get_property (GObject *object,
                                 guint property_id,
                                 GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SELECTOR:
            g_value_set_object (
                value, e_task_shell_sidebar_get_selector (
                E_TASK_SHELL_SIDEBAR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
task_shell_sidebar_dispose (GObject *object)
{
    ETaskShellSidebarPrivate *priv;

    priv = E_TASK_SHELL_SIDEBAR_GET_PRIVATE (object);

    if (priv->selector != NULL) {
        g_object_unref (priv->selector);
        priv->selector = NULL;
    }

    g_hash_table_remove_all (priv->client_table);

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

static void
task_shell_sidebar_finalize (GObject *object)
{
    ETaskShellSidebarPrivate *priv;

    priv = E_TASK_SHELL_SIDEBAR_GET_PRIVATE (object);

    g_hash_table_destroy (priv->client_table);

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

static void
task_shell_sidebar_constructed (GObject *object)
{
    ETaskShellSidebarPrivate *priv;
    EShell *shell;
    EShellView *shell_view;
    EShellBackend *shell_backend;
    EShellSidebar *shell_sidebar;
    EShellSettings *shell_settings;
    ESourceSelector *selector;
    ESourceList *source_list;
    ESource *source;
    GtkContainer *container;
    GtkTreeModel *model;
    GtkWidget *widget;
    AtkObject *a11y;
    GSList *list, *iter;
    gchar *uid;

    priv = E_TASK_SHELL_SIDEBAR_GET_PRIVATE (object);

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

    shell_sidebar = E_SHELL_SIDEBAR (object);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_backend = e_shell_view_get_shell_backend (shell_view);

    shell = e_shell_backend_get_shell (shell_backend);
    shell_settings = e_shell_get_shell_settings (shell);

    source_list = e_task_shell_backend_get_source_list (
        E_TASK_SHELL_BACKEND (shell_backend));

    container = GTK_CONTAINER (shell_sidebar);

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    gtk_container_add (container, widget);
    gtk_widget_show (widget);

    container = GTK_CONTAINER (widget);

    widget = e_task_list_selector_new (source_list);
    e_source_selector_set_select_new (E_SOURCE_SELECTOR (widget), TRUE);
    gtk_container_add (container, widget);
    a11y = gtk_widget_get_accessible (widget);
    atk_object_set_name (a11y, _("Task List Selector"));
    priv->selector = g_object_ref (widget);
    gtk_widget_show (widget);

    /* Restore the selector state from the last session. */

    selector = E_SOURCE_SELECTOR (priv->selector);
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (widget));

    g_signal_connect_swapped (
        model, "row-changed",
        G_CALLBACK (task_shell_sidebar_row_changed_cb),
        object);

    source = NULL;
    uid = e_shell_settings_get_string (
        shell_settings, "cal-primary-task-list");
    if (uid != NULL)
        source = e_source_list_peek_source_by_uid (source_list, uid);
    if (source == NULL)
        source = e_source_list_peek_source_any (source_list);
    if (source != NULL)
        e_source_selector_set_primary_selection (selector, source);
    g_free (uid);

    list = calendar_config_get_tasks_selected ();
    for (iter = list; iter != NULL; iter = iter->next) {
        uid = iter->data;
        source = e_source_list_peek_source_by_uid (source_list, uid);
        g_free (uid);

        if (source == NULL)
            continue;

        e_source_selector_select_source (selector, source);
    }
    g_slist_free (list);

    /* Listen for subsequent changes to the selector. */

    g_signal_connect_swapped (
        widget, "selection-changed",
        G_CALLBACK (task_shell_sidebar_selection_changed_cb),
        object);

    g_signal_connect_swapped (
        widget, "primary-selection-changed",
        G_CALLBACK (task_shell_sidebar_primary_selection_changed_cb),
        object);
}

static guint32
task_shell_sidebar_check_state (EShellSidebar *shell_sidebar)
{
    ETaskShellSidebar *task_shell_sidebar;
    ESourceSelector *selector;
    ESource *source;
    gboolean can_delete = FALSE;
    gboolean is_system = FALSE;
    gboolean refresh_supported = FALSE;
    guint32 state = 0;

    task_shell_sidebar = E_TASK_SHELL_SIDEBAR (shell_sidebar);
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);
    source = e_source_selector_peek_primary_selection (selector);

    if (source != NULL) {
        ECal *client;
        const gchar *uri;
        const gchar *delete;

        uri = e_source_peek_relative_uri (source);
        is_system = (uri == NULL || strcmp (uri, "system") == 0);

        can_delete = !is_system;
        delete = e_source_get_property (source, "delete");
        can_delete &= (delete == NULL || strcmp (delete, "no") != 0);

        client = g_hash_table_lookup (
            task_shell_sidebar->priv->client_table,
            e_source_peek_uid (source));
        refresh_supported =
            client && e_cal_get_refresh_supported (client);
    }

    if (source != NULL)
        state |= E_TASK_SHELL_SIDEBAR_HAS_PRIMARY_SOURCE;
    if (can_delete)
        state |= E_TASK_SHELL_SIDEBAR_CAN_DELETE_PRIMARY_SOURCE;
    if (is_system)
        state |= E_TASK_SHELL_SIDEBAR_PRIMARY_SOURCE_IS_SYSTEM;
    if (refresh_supported)
        state |= E_TASK_SHELL_SIDEBAR_SOURCE_SUPPORTS_REFRESH;

    return state;
}

static void
task_shell_sidebar_client_removed (ETaskShellSidebar *task_shell_sidebar,
                                   ECal *client)
{
    ESourceSelector *selector;
    GHashTable *client_table;
    ESource *source;
    const gchar *uid;

    client_table = task_shell_sidebar->priv->client_table;
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);

    g_signal_handlers_disconnect_matched (
        client, G_SIGNAL_MATCH_DATA, 0, 0,
        NULL, NULL, task_shell_sidebar);

    source = e_cal_get_source (client);
    e_source_selector_unselect_source (selector, source);

    uid = e_source_peek_uid (source);
    g_hash_table_remove (client_table, uid);

    task_shell_sidebar_emit_status_message (task_shell_sidebar, NULL);
}

static void
task_shell_sidebar_class_init (ETaskShellSidebarClass *class)
{
    GObjectClass *object_class;
    EShellSidebarClass *shell_sidebar_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->get_property = task_shell_sidebar_get_property;
    object_class->dispose = task_shell_sidebar_dispose;
    object_class->finalize = task_shell_sidebar_finalize;
    object_class->constructed = task_shell_sidebar_constructed;

    shell_sidebar_class = E_SHELL_SIDEBAR_CLASS (class);
    shell_sidebar_class->check_state = task_shell_sidebar_check_state;

    class->client_removed = task_shell_sidebar_client_removed;

    g_object_class_install_property (
        object_class,
        PROP_SELECTOR,
        g_param_spec_object (
            "selector",
            _("Source Selector Widget"),
            _("This widget displays groups of task lists"),
            E_TYPE_SOURCE_SELECTOR,
            G_PARAM_READABLE));

    signals[CLIENT_ADDED] = g_signal_new (
        "client-added",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, client_added),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_CAL);

    signals[CLIENT_REMOVED] = g_signal_new (
        "client-removed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, client_removed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_CAL);

    signals[STATUS_MESSAGE] = g_signal_new (
        "status-message",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, status_message),
        NULL, NULL,
        e_marshal_VOID__STRING_DOUBLE,
        G_TYPE_NONE, 2,
        G_TYPE_STRING,
        G_TYPE_DOUBLE);
}

static void
task_shell_sidebar_init (ETaskShellSidebar *task_shell_sidebar)
{
    GHashTable *client_table;

    client_table = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_object_unref);

    task_shell_sidebar->priv =
        E_TASK_SHELL_SIDEBAR_GET_PRIVATE (task_shell_sidebar);

    task_shell_sidebar->priv->client_table = client_table;

    /* Postpone widget construction until we have a shell view. */
}

GType
e_task_shell_sidebar_get_type (void)
{
    return task_shell_sidebar_type;
}

void
e_task_shell_sidebar_register_type (GTypeModule *type_module)
{
    static const GTypeInfo type_info = {
        sizeof (ETaskShellSidebarClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) task_shell_sidebar_class_init,
        (GClassFinalizeFunc) NULL,
        NULL,  /* class_data */
        sizeof (ETaskShellSidebar),
        0,     /* n_preallocs */
        (GInstanceInitFunc) task_shell_sidebar_init,
        NULL   /* value_table */
    };

    task_shell_sidebar_type = g_type_module_register_type (
        type_module, E_TYPE_SHELL_SIDEBAR,
        "ETaskShellSidebar", &type_info, 0);
}

GtkWidget *
e_task_shell_sidebar_new (EShellView *shell_view)
{
    g_return_val_if_fail (E_IS_SHELL_VIEW (shell_view), NULL);

    return g_object_new (
        E_TYPE_TASK_SHELL_SIDEBAR,
        "shell-view", shell_view, NULL);
}

GList *
e_task_shell_sidebar_get_clients (ETaskShellSidebar *task_shell_sidebar)
{
    GHashTable *client_table;

    g_return_val_if_fail (
        E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar), NULL);

    client_table = task_shell_sidebar->priv->client_table;

    return g_hash_table_get_values (client_table);
}

ESourceSelector *
e_task_shell_sidebar_get_selector (ETaskShellSidebar *task_shell_sidebar)
{
    g_return_val_if_fail (
        E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar), NULL);

    return E_SOURCE_SELECTOR (task_shell_sidebar->priv->selector);
}

void
e_task_shell_sidebar_add_source (ETaskShellSidebar *task_shell_sidebar,
                                 ESource *source)
{
    ESourceSelector *selector;
    GHashTable *client_table;
    ECal *client;
    const gchar *uid;
    const gchar *uri;
    gchar *message;

    g_return_if_fail (E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar));
    g_return_if_fail (E_IS_SOURCE (source));

    client_table = task_shell_sidebar->priv->client_table;
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);

    uid = e_source_peek_uid (source);
    client = g_hash_table_lookup (client_table, uid);

    if (client != NULL)
        return;

    client = auth_new_cal_from_source (source, E_CAL_SOURCE_TYPE_TODO);
    g_return_if_fail (client != NULL);

    g_signal_connect_swapped (
        client, "backend-died",
        G_CALLBACK (task_shell_sidebar_backend_died_cb),
        task_shell_sidebar);

    g_signal_connect_swapped (
        client, "backend-error",
        G_CALLBACK (task_shell_sidebar_backend_error_cb),
        task_shell_sidebar);

    g_hash_table_insert (client_table, g_strdup (uid), client);
    e_source_selector_select_source (selector, source);

    uri = e_cal_get_uri (client);
    message = g_strdup_printf (_("Opening tasks at %s"), uri);
    task_shell_sidebar_emit_status_message (task_shell_sidebar, message);
    g_free (message);

    g_signal_connect_swapped (
        client, "cal-opened",
        G_CALLBACK (task_shell_sidebar_client_opened_cb),
        task_shell_sidebar);

    e_cal_open_async (client, FALSE);
}

void
e_task_shell_sidebar_remove_source (ETaskShellSidebar *task_shell_sidebar,
                                    ESource *source)
{
    ESourceSelector *selector;
    GHashTable *client_table;
    ECal *client;
    const gchar *uid;

    g_return_if_fail (E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar));
    g_return_if_fail (E_IS_SOURCE (source));

    client_table = task_shell_sidebar->priv->client_table;
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);

    uid = e_source_peek_uid (source);
    client = g_hash_table_lookup (client_table, uid);

    if (client == NULL)
        return;

    task_shell_sidebar_emit_client_removed (task_shell_sidebar, client);
}