/*
 * 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)
{
}