/*
 * Sylpheed -- a GTK+ based, lightweight, and fast e-mail client
 * Copyright (C) 1999-2009 Hiroyuki Yamamoto and the Claws Mail Team
 *
 * 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 <glib.h>
#include <glib/gi18n.h>
#include <string.h>

#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>

#include "defs.h"
#include "plugin.h"

#include "filesel.h"
#include "alertpanel.h"
#include "prefs_common.h"
#include "../inc.h"
#include "manual.h"
#include "manage_window.h"

enum {
	PLUGINWINDOW_NAME,		/*<! plugin name */
	PLUGINWINDOW_DATA,		/*<! Plugin pointer */
	PLUGINWINDOW_STYLE,		/*<! italic if error */
	N_PLUGINWINDOW_COLUMNS
};

typedef struct _PluginWindow
{
	GtkWidget *window;
	GtkWidget *plugin_list_view;
	GtkWidget *plugin_desc;
	GtkWidget *unload_btn;

	Plugin *selected_plugin;
	
	gboolean loading;
} PluginWindow;

static GtkListStore* pluginwindow_create_data_store	(void);
static GtkWidget *pluginwindow_list_view_create		(PluginWindow *pluginwindow);
static void pluginwindow_create_list_view_columns	(GtkWidget *list_view);
static gboolean pluginwindow_selected			(GtkTreeSelection *selector,
							 GtkTreeModel *model, 
							 GtkTreePath *path,
							 gboolean currently_selected,
							 gpointer data);

static void close_cb(GtkButton *button, PluginWindow *pluginwindow)
{
	if (pluginwindow->loading)
		return;
	gtk_widget_destroy(pluginwindow->window);
	g_free(pluginwindow);
	plugin_save_list();
	inc_unlock();
}

static gint pluginwindow_delete_cb(GtkWidget *widget, GdkEventAny *event,
				  PluginWindow *pluginwindow)
{
	if (pluginwindow->loading)
		return FALSE;
	close_cb(NULL,pluginwindow);
	return TRUE;
}

static void set_plugin_list(PluginWindow *pluginwindow)
{
	GSList *plugins, *cur, *unloaded;
	const gchar *text;
	GtkListStore *store;
	GtkTreeIter iter;
	GtkTextBuffer *textbuf;
	GtkTextIter start_iter, end_iter;
	GtkTreeSelection *selection;

	plugins = plugin_get_list();
	unloaded = plugin_get_unloaded_list();

	store = GTK_LIST_STORE(gtk_tree_view_get_model(GTK_TREE_VIEW
				(pluginwindow->plugin_list_view)));
 	gtk_tree_sortable_set_sort_column_id(GTK_TREE_SORTABLE(store),
                                             0, GTK_SORT_ASCENDING);
	gtk_list_store_clear(store);
	
	textbuf = gtk_text_view_get_buffer(GTK_TEXT_VIEW(pluginwindow->plugin_desc));
	gtk_text_view_set_cursor_visible(GTK_TEXT_VIEW(pluginwindow->plugin_desc), FALSE);
	gtk_text_view_set_editable(GTK_TEXT_VIEW(pluginwindow->plugin_desc), FALSE);
	gtk_text_buffer_get_start_iter(textbuf, &start_iter);
	gtk_text_buffer_get_end_iter(textbuf, &end_iter);
	gtk_text_buffer_delete(textbuf, &start_iter, &end_iter);
	gtk_widget_set_sensitive(pluginwindow->unload_btn, FALSE);

	for(cur = plugins; cur != NULL; cur = g_slist_next(cur)) {
		Plugin *plugin = (Plugin *) cur->data;

		gtk_list_store_append(store, &iter);
		text = plugin_get_name(plugin); 
		gtk_list_store_set(store, &iter,
				   PLUGINWINDOW_NAME, text,
				   PLUGINWINDOW_DATA, plugin,
				   PLUGINWINDOW_STYLE, PANGO_STYLE_NORMAL,
				   -1);
	}

	for(cur = unloaded; cur != NULL; cur = g_slist_next(cur)) {
		Plugin *plugin = (Plugin *) cur->data;

		gtk_list_store_append(store, &iter);
		text = plugin_get_name(plugin);
		gtk_list_store_set(store, &iter,
				   PLUGINWINDOW_NAME, text,
				   PLUGINWINDOW_DATA, plugin,
				   PLUGINWINDOW_STYLE, PANGO_STYLE_ITALIC,
				   -1);
	}

	selection = gtk_tree_view_get_selection(GTK_TREE_VIEW(pluginwindow->plugin_list_view));
	if (gtk_tree_model_get_iter_first(GTK_TREE_MODEL(store), &iter))
		gtk_tree_selection_select_iter(selection, &iter);
		
	g_slist_free(plugins);
}

static void select_row_cb(Plugin *plugin, PluginWindow *pluginwindow)
{
	GtkTextView *plugin_desc = GTK_TEXT_VIEW(pluginwindow->plugin_desc);
	GtkTextBuffer *textbuf = gtk_text_view_get_buffer(plugin_desc);
	GtkTextIter start_iter, end_iter;
	gchar *text;

	pluginwindow->selected_plugin = plugin;

	if (pluginwindow->selected_plugin != NULL) {
		const gchar *desc = plugin_get_desc(plugin);
		const gchar *err = plugin_get_error(plugin);
		gtk_text_buffer_get_start_iter(textbuf, &start_iter);
		gtk_text_buffer_get_end_iter(textbuf, &end_iter);
		gtk_text_buffer_delete(textbuf, &start_iter, &end_iter);
		
		if (err == NULL)
			text = g_strconcat(desc, _("\n\nVersion: "),
				   plugin_get_version(plugin), "\n", NULL);
		else
			text = g_strconcat(_("Error: "),
				   err, "\n", _("Plugin is not functional."), 
				   "\n\n", desc, _("\n\nVersion: "),
				   plugin_get_version(plugin), "\n", NULL);
		gtk_text_buffer_insert(textbuf, &start_iter, text, strlen(text));
		g_free(text);
		gtk_widget_set_sensitive(pluginwindow->unload_btn, TRUE);
	} else {
		gtk_widget_set_sensitive(pluginwindow->unload_btn, FALSE);
	}
}

static void unselect_row_cb(Plugin *plugin, PluginWindow *pluginwindow)
{
	gtk_widget_set_sensitive(pluginwindow->unload_btn, FALSE);	
}

static void unload_cb(GtkButton *button, PluginWindow *pluginwindow)
{
	Plugin *plugin = pluginwindow->selected_plugin;

	cm_return_if_fail(plugin != NULL);
	pluginwindow->loading = TRUE;
	plugin_unload(plugin);
	pluginwindow->loading = FALSE;
	pluginwindow->selected_plugin = NULL;
	set_plugin_list(pluginwindow);
}

static void load_cb(GtkButton *button, PluginWindow *pluginwindow)
{
	GList *file_list;

	file_list = filesel_select_multiple_files_open_with_filter(
			_("Select the Plugins to load"), get_plugin_dir(), 
			"*." G_MODULE_SUFFIX);

	if (file_list) {
		GList *tmp;
		pluginwindow->loading = TRUE;
		for ( tmp = file_list; tmp; tmp = tmp->next) {
			gchar *file, *error = NULL;

			file = (gchar *) tmp->data;
			if (!file) continue;
			plugin_load(file, &error);
			if (error != NULL) {
				gchar *basename = g_path_get_basename(file);
				alertpanel_error(
				_("The following error occurred while loading %s :\n\n%s\n"),
				basename, error);
				g_free(basename);
				g_free(error);
			}

			/* FIXME: globally or atom-ly : ? */
			set_plugin_list(pluginwindow);
			g_free(file);
		}
		pluginwindow->loading = FALSE;
		g_list_free(file_list);
	}		
}

static gboolean pluginwindow_key_pressed(GtkWidget *widget, GdkEventKey *event,
				     PluginWindow *pluginwindow)
{
	if (event) {
		switch (event->keyval) {
			case GDK_Escape : 
			case GDK_Return : 
			case GDK_KP_Enter :
				close_cb(NULL, pluginwindow);
				break;
			case GDK_Insert : 
			case GDK_KP_Insert :
			case GDK_KP_Add : 
			case GDK_plus :
				load_cb(NULL, pluginwindow);
				break;
			case GDK_Delete : 
			case GDK_KP_Delete :
			case GDK_KP_Subtract : 
			case GDK_minus :
				unload_cb(NULL, pluginwindow);
				break;
			default :
				break;
		}
	}
	return FALSE;
}

/*!
 *\brief	Save Gtk object size to prefs dataset
 */
static void pluginwindow_size_allocate_cb(GtkWidget *widget,
					 GtkAllocation *allocation)
{
	cm_return_if_fail(allocation != NULL);

	prefs_common.pluginswin_width = allocation->width;
	prefs_common.pluginswin_height = allocation->height;
}


void pluginwindow_create()
{
	PluginWindow *pluginwindow;
	GtkWidget *window;
	GtkWidget *vbox1;
	GtkWidget *hbox2;
	GtkWidget *scrolledwindow2;
	GtkWidget *plugin_list_view;
	GtkWidget *vbox2;
	GtkWidget *frame2;
	GtkWidget *label13;
	GtkWidget *scrolledwindow3;
	GtkWidget *plugin_desc;
	GtkWidget *hbuttonbox1;
	GtkWidget *hbuttonbox2;
	GtkWidget *help_btn;
	GtkWidget *load_btn;
	GtkWidget *unload_btn;
	GtkWidget *close_btn;
	GtkWidget *get_more_btn;
	GtkWidget *desc_lbl;
	GtkWidget *vbox3;
	GtkWidget *hbox_info;
	static GdkGeometry geometry;
	CLAWS_TIP_DECL();	

	debug_print("Creating plugins window...\n");

	pluginwindow = g_new0(PluginWindow, 1);

	window = gtkut_window_new(GTK_WINDOW_TOPLEVEL, "pluginwindow");
	gtk_container_set_border_width(GTK_CONTAINER(window), 8);
	gtk_window_set_title(GTK_WINDOW(window), _("Plugins"));
	gtk_window_set_modal(GTK_WINDOW(window), TRUE);
	manage_window_set_transient(GTK_WINDOW(window));

	vbox1 = gtk_vbox_new(FALSE, 4);
	gtk_widget_show(vbox1);
	gtk_container_add(GTK_CONTAINER(window), vbox1);
	gtk_box_set_homogeneous(GTK_BOX(vbox1), FALSE);
	gtk_widget_realize(window);

	hbox2 = gtk_hbox_new(FALSE, 8);
	gtk_widget_show(hbox2);
	gtk_box_pack_start(GTK_BOX(vbox1), hbox2, TRUE, TRUE, 0);

	vbox3 = gtk_vbox_new(FALSE, 4);
	gtk_widget_show(vbox3);
	gtk_box_pack_start(GTK_BOX(hbox2), vbox3, FALSE, FALSE, 0);

	scrolledwindow2 = gtk_scrolled_window_new(NULL, NULL);
	gtk_widget_show(scrolledwindow2);
	gtk_box_pack_start(GTK_BOX(vbox3), scrolledwindow2, TRUE, TRUE, 0);
	gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolledwindow2),
					GTK_SHADOW_ETCHED_IN);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW
				       (scrolledwindow2), GTK_POLICY_NEVER,
				       GTK_POLICY_AUTOMATIC);

	plugin_list_view = pluginwindow_list_view_create(pluginwindow);
	gtk_widget_show(plugin_list_view);
	gtk_container_add(GTK_CONTAINER(scrolledwindow2), plugin_list_view);
	gtk_widget_grab_focus(GTK_WIDGET(plugin_list_view));

	gtkut_stock_button_set_create(&hbuttonbox1,
				&load_btn, _("Load..."),
				&unload_btn, _("Unload"),
				NULL, NULL);
	gtk_widget_show(hbuttonbox1);
	gtk_box_pack_start(GTK_BOX(vbox3), hbuttonbox1, FALSE, FALSE, 0);
	
	vbox2 = gtk_vbox_new(FALSE, 0);
	gtk_widget_show(vbox2);
	gtk_box_pack_start(GTK_BOX(hbox2), vbox2, TRUE, TRUE, 0);

	frame2 = gtk_frame_new(NULL);
	gtk_widget_show(frame2);
	gtk_box_pack_start(GTK_BOX(vbox2), frame2, FALSE, TRUE, 0);

	label13 = gtk_label_new(_("Description"));
	gtk_widget_show(label13);
	gtk_container_add(GTK_CONTAINER(frame2), label13);
	gtk_misc_set_alignment(GTK_MISC(label13), 0, 0.5);
	gtk_misc_set_padding(GTK_MISC(label13), 2, 2);

	scrolledwindow3 = gtk_scrolled_window_new(NULL, NULL);
	gtk_widget_show(scrolledwindow3);
	gtk_box_pack_start(GTK_BOX(vbox2), scrolledwindow3, TRUE, TRUE, 0);
	gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(scrolledwindow3),
					GTK_SHADOW_ETCHED_IN);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW
				       (scrolledwindow3), GTK_POLICY_NEVER,
				       GTK_POLICY_ALWAYS);

	plugin_desc = gtk_text_view_new();
	gtk_widget_show(plugin_desc);
	gtk_container_add(GTK_CONTAINER(scrolledwindow3), plugin_desc);

	hbox_info = gtk_hbox_new(FALSE, 5);
	gtk_widget_show(hbox_info);
	
	desc_lbl = gtk_label_new(_("More plugins are available from the "
			           "Claws Mail website."));
	gtk_misc_set_alignment(GTK_MISC(desc_lbl), 0, 0.5);
	gtk_widget_show(desc_lbl);
	gtk_box_pack_start(GTK_BOX(hbox_info), desc_lbl, FALSE, FALSE, 0);

	get_more_btn = gtkut_get_link_btn(window, PLUGINS_URI, _("Get more..."));
	gtk_misc_set_alignment(GTK_MISC(gtk_bin_get_child(GTK_BIN((get_more_btn)))), 0, 0.5);
	gtk_widget_show(get_more_btn);
	gtk_box_pack_start(GTK_BOX(hbox_info), get_more_btn, FALSE, FALSE, 0);
	gtk_box_pack_start(GTK_BOX(hbox_info), gtk_label_new(""), TRUE, TRUE, 0);
	gtk_box_pack_start(GTK_BOX(vbox1), hbox_info, FALSE, FALSE, 0);

	gtkut_stock_button_set_create_with_help(&hbuttonbox2, &help_btn,
			&close_btn, GTK_STOCK_CLOSE,
			NULL, NULL, NULL, NULL);

	gtk_box_set_spacing(GTK_BOX(hbuttonbox2), 6);
	gtk_widget_show(hbuttonbox2);
	gtk_box_pack_end(GTK_BOX(vbox1), hbuttonbox2, FALSE, FALSE, 0);

	gtk_text_view_set_wrap_mode(GTK_TEXT_VIEW(plugin_desc), GTK_WRAP_WORD);
	gtk_widget_set_sensitive(GTK_WIDGET(unload_btn), FALSE);

	g_signal_connect(G_OBJECT(help_btn), "clicked",
			 G_CALLBACK(manual_open_with_anchor_cb),
			 MANUAL_ANCHOR_PLUGINS);
	g_signal_connect(G_OBJECT(load_btn), "clicked",
			 G_CALLBACK(load_cb), pluginwindow);
	g_signal_connect(G_OBJECT(unload_btn), "clicked",
			 G_CALLBACK(unload_cb), pluginwindow);
	g_signal_connect(G_OBJECT(close_btn), "clicked",
			 G_CALLBACK(close_cb), pluginwindow);
	g_signal_connect(G_OBJECT(window), "size_allocate",
			 G_CALLBACK(pluginwindow_size_allocate_cb), NULL);
	g_signal_connect(G_OBJECT(window), "key_press_event",
			   G_CALLBACK(pluginwindow_key_pressed), pluginwindow);
	g_signal_connect(G_OBJECT(window), "delete_event",
			 G_CALLBACK(pluginwindow_delete_cb), pluginwindow);

	CLAWS_SET_TIP(load_btn,
			_("Click here to load one or more plugins"));

	CLAWS_SET_TIP(unload_btn,
			_("Unload the selected plugin"));

	pluginwindow->window = window;
	pluginwindow->plugin_list_view = plugin_list_view;
	pluginwindow->plugin_desc = plugin_desc;
	pluginwindow->unload_btn = unload_btn;
	pluginwindow->selected_plugin = NULL;

	set_plugin_list(pluginwindow);

	inc_lock();

	if (!geometry.min_height) {
		geometry.min_width = -1;
		geometry.min_height = 300;
	}

	gtk_window_set_geometry_hints(GTK_WINDOW(window), NULL, &geometry,
				      GDK_HINT_MIN_SIZE);
	gtk_window_set_default_size(GTK_WINDOW(window), prefs_common.pluginswin_width,
				    prefs_common.pluginswin_height);

	gtk_widget_show(window);
}

static GtkListStore* pluginwindow_create_data_store(void)
{
	return gtk_list_store_new(N_PLUGINWINDOW_COLUMNS,
				  G_TYPE_STRING,	
				  G_TYPE_POINTER,
				  PANGO_TYPE_STYLE,
				  -1);
}

static GtkWidget *pluginwindow_list_view_create(PluginWindow *pluginwindow)
{
	GtkTreeView *list_view;
	GtkTreeSelection *selector;
	GtkTreeModel *model;

	model = GTK_TREE_MODEL(pluginwindow_create_data_store());
	list_view = GTK_TREE_VIEW(gtk_tree_view_new_with_model(model));
	g_object_unref(model);	

	gtk_tree_view_set_rules_hint(list_view, prefs_common.use_stripes_everywhere);
	gtk_tree_view_set_search_column (list_view, 0);

	selector = gtk_tree_view_get_selection(list_view);
	gtk_tree_selection_set_mode(selector, GTK_SELECTION_BROWSE);
	gtk_tree_selection_set_select_function(selector, pluginwindow_selected,
					       pluginwindow, NULL);

	/* create the columns */
	pluginwindow_create_list_view_columns(GTK_WIDGET(list_view));

	return GTK_WIDGET(list_view);
}

static void pluginwindow_create_list_view_columns(GtkWidget *list_view)
{
	GtkTreeViewColumn *column;
	GtkCellRenderer *renderer;

	renderer = gtk_cell_renderer_text_new();
	column = gtk_tree_view_column_new_with_attributes
		(_("Loaded plugins"),
		 renderer,
		 "text", PLUGINWINDOW_NAME,
		 "style", PLUGINWINDOW_STYLE,
		 NULL);
	gtk_tree_view_append_column(GTK_TREE_VIEW(list_view), column);		
}

static gboolean pluginwindow_selected(GtkTreeSelection *selector,
				      GtkTreeModel *model, 
				      GtkTreePath *path,
				      gboolean currently_selected,
				      gpointer data)
{
	GtkTreeIter iter;
	Plugin *plugin;
	
	if (!gtk_tree_model_get_iter(model, &iter, path))
		return TRUE;

	gtk_tree_model_get(model, &iter, 
			   PLUGINWINDOW_DATA, &plugin,
			   -1);

	if (currently_selected) 
		unselect_row_cb(plugin, data);
	else
		select_row_cb(plugin, data);

	return TRUE;
}

