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/*
 * evolution-cal-config-local.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/>
 *
 */

#include <config.h>
#include <glib/gi18n-lib.h>

#include <libebackend/libebackend.h>

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

#include "e-source-local.h"

typedef ESourceConfigBackend ECalConfigLocal;
typedef ESourceConfigBackendClass ECalConfigLocalClass;

typedef struct _Context Context;

struct _Context {
    GtkWidget *custom_file_checkbox;
    GtkWidget *custom_file_chooser;
    GtkWidget *writable_checkbox;
};

/* Module Entry Points */
void e_module_load (GTypeModule *type_module);
void e_module_unload (GTypeModule *type_module);

/* Forward Declarations */
GType e_cal_config_local_get_type (void);

G_DEFINE_DYNAMIC_TYPE (
    ECalConfigLocal,
    e_cal_config_local,
    E_TYPE_SOURCE_CONFIG_BACKEND)

static void
cal_config_local_context_free (Context *context)
{
    g_object_unref (context->custom_file_checkbox);
    g_object_unref (context->custom_file_chooser);
    g_object_unref (context->writable_checkbox);

    g_slice_free (Context, context);
}

static gboolean
cal_config_local_active_to_custom_file (GBinding *binding,
                                        const GValue *source_value,
                                        GValue *target_value,
                                        gpointer user_data)
{
    Context *context = user_data;
    GtkFileChooser *file_chooser;
    GFile *file = NULL;

    file_chooser = GTK_FILE_CHOOSER (context->custom_file_chooser);

    if (g_value_get_boolean (source_value))
        file = gtk_file_chooser_get_file (file_chooser);

    g_value_take_object (target_value, file);

    return TRUE;
}

static gboolean
cal_config_local_custom_file_to_active (GBinding *binding,
                                        const GValue *source_value,
                                        GValue *target_value,
                                        gpointer user_data)
{
    Context *context = user_data;
    GtkFileChooser *file_chooser;
    GFile *file;
    gboolean success;

    file_chooser = GTK_FILE_CHOOSER (context->custom_file_chooser);

    file = g_value_get_object (source_value);

    if (file == NULL) {
        g_value_set_boolean (target_value, FALSE);
        return TRUE;
    }

    success = gtk_file_chooser_set_file (file_chooser, file, NULL);
    g_value_set_boolean (target_value, success);

    return success;
}

static void
cal_config_local_file_set_cb (GtkFileChooserButton *button,
                              GtkWidget *custom_file_checkbox)
{
    /* This will update ESourceLocal:custom-file. */
    g_object_notify (G_OBJECT (custom_file_checkbox), "active");
}

static void
cal_config_local_insert_widgets (ESourceConfigBackend *backend,
                                 ESource *scratch_source)
{
    ESourceConfig *config;
    ESource *builtin_source;
    ESourceRegistry *registry;
    ESourceExtension *extension;
    GtkFileFilter *filter;
    GtkWidget *container;
    GtkWidget *widget;
    Context *context;
    gboolean source_is_builtin = FALSE;
    const gchar *extension_name;
    const gchar *uid;
    gchar *markup;

    uid = e_source_get_uid (scratch_source);
    config = e_source_config_backend_get_config (backend);
    registry = e_source_config_get_registry (config);

    /* The built-in sources can't use a custom file. */

    builtin_source = e_source_registry_ref_builtin_calendar (registry);
    source_is_builtin |= e_source_equal (scratch_source, builtin_source);
    g_object_unref (builtin_source);

    builtin_source = e_source_registry_ref_builtin_memo_list (registry);
    source_is_builtin |= e_source_equal (scratch_source, builtin_source);
    g_object_unref (builtin_source);

    builtin_source = e_source_registry_ref_builtin_task_list (registry);
    source_is_builtin |= e_source_equal (scratch_source, builtin_source);
    g_object_unref (builtin_source);

    if (source_is_builtin)
        return;

    context = g_slice_new (Context);

    g_object_set_data_full (
        G_OBJECT (backend), uid, context,
        (GDestroyNotify) cal_config_local_context_free);

    widget = gtk_check_button_new_with_label (
        _("Use an existing iCalendar (ics) file"));
    e_source_config_insert_widget (
        config, scratch_source, NULL, widget);
    context->custom_file_checkbox = g_object_ref (widget);
    gtk_widget_show (widget);

    g_signal_connect_swapped (
        widget, "toggled",
        G_CALLBACK (e_source_config_resize_window), config);

    container = e_source_config_get_page (config, scratch_source);

    /* Put some extra padding above and below the header. */
    widget = gtk_alignment_new (0.0, 0.0, 1.0, 1.0);
    gtk_alignment_set_padding (GTK_ALIGNMENT (widget), 12, 6, 0, 0);
    gtk_box_pack_start (GTK_BOX (container), widget, FALSE, FALSE, 0);
    gtk_widget_show (widget);

    g_object_bind_property (
        context->custom_file_checkbox, "active",
        widget, "visible",
        G_BINDING_SYNC_CREATE);

    container = widget;

    markup = g_markup_printf_escaped ("<b>%s</b>", _("iCalendar File"));
    widget = gtk_label_new (markup);
    gtk_label_set_use_markup (GTK_LABEL (widget), TRUE);
    gtk_misc_set_alignment (GTK_MISC (widget), 0.0, 0.5);
    gtk_container_add (GTK_CONTAINER (container), widget);
    gtk_widget_show (widget);
    g_free (markup);

    filter = gtk_file_filter_new ();
    gtk_file_filter_add_mime_type (filter, "text/calendar");

    widget = gtk_file_chooser_button_new (
        _("Choose an iCalendar file"), GTK_FILE_CHOOSER_ACTION_OPEN);
    gtk_file_chooser_set_filter (GTK_FILE_CHOOSER (widget), filter);
    e_source_config_insert_widget (
        config, scratch_source, _("File:"), widget);
    context->custom_file_chooser = g_object_ref (widget);
    gtk_widget_show (widget);

    g_signal_connect (
        widget, "file-set",
        G_CALLBACK (cal_config_local_file_set_cb),
        context->custom_file_checkbox);

    g_object_bind_property (
        context->custom_file_checkbox, "active",
        widget, "visible",
        G_BINDING_SYNC_CREATE);

    widget = gtk_check_button_new_with_label (
        _("Allow Evolution to update the file"));
    e_source_config_insert_widget (
        config, scratch_source, NULL, widget);
    context->writable_checkbox = g_object_ref (widget);
    gtk_widget_show (widget);

    g_object_bind_property (
        context->custom_file_checkbox, "active",
        widget, "visible",
        G_BINDING_SYNC_CREATE);

    extension_name = E_SOURCE_EXTENSION_LOCAL_BACKEND;
    extension = e_source_get_extension (scratch_source, extension_name);

    g_object_bind_property_full (
        extension, "custom-file",
        context->custom_file_checkbox, "active",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE,
        cal_config_local_custom_file_to_active,
        cal_config_local_active_to_custom_file,
        context, (GDestroyNotify) NULL);
}

static gboolean
cal_config_local_check_complete (ESourceConfigBackend *backend,
                                 ESource *scratch_source)
{
    ESourceLocal *extension;
    GtkToggleButton *toggle_button;
    Context *context;
    GFile *file;
    const gchar *extension_name;
    const gchar *uid;
    gboolean active;

    uid = e_source_get_uid (scratch_source);
    context = g_object_get_data (G_OBJECT (backend), uid);

    /* This function might get called before we install a
     * context for this ESource, in which case just return. */
    if (context == NULL)
        return FALSE;

    extension_name = E_SOURCE_EXTENSION_LOCAL_BACKEND;
    extension = e_source_get_extension (scratch_source, extension_name);

    file = e_source_local_get_custom_file (extension);

    toggle_button = GTK_TOGGLE_BUTTON (context->custom_file_checkbox);
    active = gtk_toggle_button_get_active (toggle_button);

    /* If toggle button is active we need a valid file. */
    return !active || (file != NULL);
}

static void
e_cal_config_local_class_init (ESourceConfigBackendClass *class)
{
    EExtensionClass *extension_class;

    extension_class = E_EXTENSION_CLASS (class);
    extension_class->extensible_type = E_TYPE_CAL_SOURCE_CONFIG;

    class->parent_uid = "local-stub";
    class->backend_name = "local";
    class->insert_widgets = cal_config_local_insert_widgets;
    class->check_complete = cal_config_local_check_complete;
}

static void
e_cal_config_local_class_finalize (ESourceConfigBackendClass *class)
{
}

static void
e_cal_config_local_init (ESourceConfigBackend *backend)
{
}

G_MODULE_EXPORT void
e_module_load (GTypeModule *type_module)
{
    e_source_local_type_register (type_module);
    e_cal_config_local_register_type (type_module);
}

G_MODULE_EXPORT void
e_module_unload (GTypeModule *type_module)
{
}