/**
 * @file
 * Functions for handling the "Quick Open" menu
 */

/*
 * Copyright (C) 2012 Otto-von-Guericke-Universität Magdeburg
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <assert.h>
#include <string.h>
#include <unistd.h>

#include <glib.h>
#include <glib/gprintf.h>
#include <glib/gstdio.h>

#include <gtk/gtk.h>

#include "experiment-player.h"

static inline gboolean quickopen_filter(const gchar *name);
static gint quickopen_item_cmp(gconstpointer a, gconstpointer b);

static void reconfigure_all_check_menu_items_cb(GtkWidget *widget, gpointer user_data);
static void quickopen_item_on_activate(GtkWidget *widget, gpointer user_data);

GtkWidget *quickopen_menu,
	  *quickopen_menu_empty_item;

/*
 * GtkBuilder signal callbacks
 * NOTE: for some strange reason the parameters are switched
 */

/** @private */
void
quickopen_menu_choosedir_item_activate_cb(GtkWidget *widget,
					  gpointer data __attribute__((unused)))
{
	GtkWidget *dialog;
	gchar *quickopen_directory;

	dialog = gtk_file_chooser_dialog_new("Choose Directory...", GTK_WINDOW(widget),
					     GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER,
					     GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
					     GTK_STOCK_OK, GTK_RESPONSE_ACCEPT,
					     NULL);

	quickopen_directory = config_get_quickopen_directory();
	gtk_file_chooser_set_current_folder(GTK_FILE_CHOOSER(dialog),
					    quickopen_directory);
	g_free(quickopen_directory);

	if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
		quickopen_directory =
			gtk_file_chooser_get_filename(GTK_FILE_CHOOSER(dialog));
		config_set_quickopen_directory(quickopen_directory);
		g_free(quickopen_directory);

		refresh_quickopen_menu(GTK_MENU(quickopen_menu));
	}

	gtk_widget_destroy(dialog);
}

/** @todo refresh item unnecessary, rebuild menu when it is opened */
/** @private */
void
quickopen_menu_refresh_item_activate_cb(GtkWidget *widget,
					gpointer data __attribute__((unused)))
{
	refresh_quickopen_menu(GTK_MENU(widget));
}

static inline gboolean
quickopen_filter(const gchar *name)
{
	static GPatternSpec **patterns = NULL;

	guint name_length = strlen(name);
	gchar *name_reversed = g_strreverse(g_strdup(name));

	gchar *quickopen_directory;
	gchar *trans_name, *p;
	gboolean res = FALSE;

	if (patterns == NULL) {
		patterns = (GPatternSpec **)
			   g_strsplit(EXPERIMENT_MOVIE_FILTER, ";", 0);

		for (GPatternSpec **filter = patterns; *filter != NULL; filter++) {
			GPatternSpec *pattern;

			pattern = g_pattern_spec_new((gchar *)*filter);
			g_free(*filter);
			*filter = pattern;
		}
	}

	for (GPatternSpec **pattern = patterns; *pattern != NULL; pattern++) {
		res = g_pattern_match(*pattern, name_length,
				      name, name_reversed);
		if (res)
			break;
	}
	g_free(name_reversed);
	if (!res)
		return FALSE;

	quickopen_directory = config_get_quickopen_directory();
	trans_name = g_build_filename(quickopen_directory, name, NULL);
	g_free(quickopen_directory);
	trans_name = g_realloc(trans_name, strlen(trans_name) +
					   sizeof(EXPERIMENT_TRANSCRIPT_EXT));
	if ((p = g_strrstr(trans_name, ".")) == NULL) {
		g_free(trans_name);
		return FALSE;
	}
	g_stpcpy(++p, EXPERIMENT_TRANSCRIPT_EXT);

	res = !g_access(trans_name, F_OK | R_OK);
	g_free(trans_name);

	return res;
}

static gint
quickopen_item_cmp(gconstpointer a, gconstpointer b)
{
	return -g_strcmp0(gtk_menu_item_get_label(*(GtkMenuItem **)a),
			  gtk_menu_item_get_label(*(GtkMenuItem **)b));
}

void
refresh_quickopen_menu(GtkMenu *menu)
{
	static gchar		**fullnames = NULL;
	static GPtrArray	*items = NULL;

	int fullnames_n;

	gchar *quickopen_directory;
	GDir *dir;
	const gchar *name;

	if (items != NULL)
		g_ptr_array_free(items, TRUE);
	items = g_ptr_array_new_with_free_func((GDestroyNotify)gtk_widget_destroy);

	g_strfreev(fullnames);
	fullnames = NULL;
	fullnames_n = 0;

	quickopen_directory = config_get_quickopen_directory();
	dir = g_dir_open(quickopen_directory, 0, NULL);

	while ((name = g_dir_read_name(dir)) != NULL) {
		if (!quickopen_filter(name))
			continue;

		gchar *itemname;
		GtkWidget *item;

		fullnames = g_realloc(fullnames, (fullnames_n+2) * sizeof(gchar *));
		fullnames[fullnames_n] = g_build_filename(quickopen_directory,
							  name, NULL);

		itemname = path_strip_extension(name);
		item = gtk_check_menu_item_new_with_label(itemname);
		g_ptr_array_add(items, item);
		g_free(itemname);

		gtk_check_menu_item_set_draw_as_radio(GTK_CHECK_MENU_ITEM(item),
						      TRUE);
		gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(item),
					       !g_strcmp0(current_filename,
					       	          fullnames[fullnames_n]));

		g_signal_connect(G_OBJECT(item), "activate",
				 G_CALLBACK(quickopen_item_on_activate),
				 fullnames[fullnames_n]);

		fullnames_n++;
	}
	if (fullnames != NULL)
		fullnames[fullnames_n] = NULL;
	g_ptr_array_sort(items, quickopen_item_cmp);

	g_dir_close(dir);
	g_free(quickopen_directory);

	for (int i = 0; i < items->len; i++) {
		GtkWidget *item = GTK_WIDGET(g_ptr_array_index(items, i));

		gtk_menu_shell_prepend(GTK_MENU_SHELL(menu), item);
		gtk_widget_show(item);
	}

	gtk_widget_set_visible(quickopen_menu_empty_item, !fullnames_n);
}

static void
reconfigure_all_check_menu_items_cb(GtkWidget *widget, gpointer user_data)
{
	if (!GTK_IS_CHECK_MENU_ITEM(widget))
		return;

	g_signal_handlers_block_matched(widget, G_SIGNAL_MATCH_FUNC,
					0, 0, NULL,
					quickopen_item_on_activate, NULL);
	gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(widget),
				       widget == GTK_WIDGET(user_data));
	g_signal_handlers_unblock_matched(widget, G_SIGNAL_MATCH_FUNC,
					  0, 0, NULL,
					  quickopen_item_on_activate, NULL);
}

static void
quickopen_item_on_activate(GtkWidget *widget, gpointer user_data)
{
	const gchar *filename = (const gchar *)user_data;
	gchar *trans_name, *p;

	gtk_container_foreach(GTK_CONTAINER(quickopen_menu),
			      reconfigure_all_check_menu_items_cb, widget);

	if (!load_media_file(filename)) {
		/* FIXME */
	}

	trans_name = g_strdup(filename);
	trans_name = g_realloc(trans_name, strlen(trans_name) +
					   sizeof(EXPERIMENT_TRANSCRIPT_EXT));
	if ((p = g_strrstr(trans_name, ".")) == NULL) {
		g_free(trans_name);
		/* FIXME */
		return;
	}
	g_stpcpy(++p, EXPERIMENT_TRANSCRIPT_EXT);

	if (!load_transcript_file(trans_name)) {
		/* FIXME */
	}

	g_free(trans_name);
}