/*
 * e-shell.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-shell.h"

#include <glib/gi18n.h>
#include <e-preferences-window.h>
#include <e-util/e-util.h>

#include <e-shell-module.h>
#include <e-shell-upgrade.h>
#include <e-shell-window.h>

#define SHUTDOWN_TIMEOUT	500  /* milliseconds */

#define E_SHELL_GET_PRIVATE(obj) \
	(G_TYPE_INSTANCE_GET_PRIVATE \
	((obj), E_TYPE_SHELL, EShellPrivate))

struct _EShellPrivate {
	GList *active_windows;
	EShellLineStatus line_status;

	/* Shell Modules */
	GList *loaded_modules;
	GHashTable *modules_by_name;
	GHashTable *modules_by_scheme;

	guint online_mode : 1;
	guint safe_mode   : 1;
};

enum {
	PROP_0,
	PROP_ONLINE_MODE
};

enum {
	HANDLE_URI,
	SEND_RECEIVE,
	WINDOW_CREATED,
	WINDOW_DESTROYED,
	LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];

#if NM_SUPPORT
void e_shell_dbus_initialize (EShell *shell);
#endif

static gboolean
shell_window_delete_event_cb (EShell *shell,
                              EShellWindow *shell_window)
{
	/* If other windows are open we can safely close this one. */
	if (g_list_length (shell->priv->active_windows) > 1)
		return FALSE;

	/* Otherwise we initiate application shutdown. */
	return !e_shell_quit (shell);
}

static gboolean
shell_window_focus_in_event_cb (EShell *shell,
                                GdkEventFocus *event,
                                EShellWindow *shell_window)
{
	GList *list, *link;

	/* Keep the active windows list sorted by most recently focused,
	 * so the first item in the list should always be the currently
	 * focused shell window. */

	list = shell->priv->active_windows;
	link = g_list_find (list, shell_window);
	g_return_val_if_fail (link != NULL, FALSE);

	if (link != list) {
		list = g_list_remove_link (list, link);
		list = g_list_concat (link, list);
	}

	shell->priv->active_windows = list;

	return FALSE;
}

static void
shell_window_weak_notify_cb (EShell *shell,
                             GObject *where_the_object_was)
{
	GList *active_windows;
	gboolean last_window;

	active_windows = shell->priv->active_windows;
	active_windows = g_list_remove (active_windows, where_the_object_was);
	shell->priv->active_windows = active_windows;

	last_window = (shell->priv->active_windows == NULL);
	g_signal_emit (shell, signals[WINDOW_DESTROYED], 0, last_window);
}

/* Helper for shell_query_module() */
static void
shell_split_and_insert_items (GHashTable *hash_table,
                              const gchar *items,
                              EShellModule *shell_module)
{
	gpointer key;
	gchar **strv;
	gint ii;

	strv = g_strsplit_set (items, ":", -1);

	for (ii = 0; strv[ii] != NULL; ii++) {
		key = (gpointer) g_intern_string (strv[ii]);
		g_hash_table_insert (hash_table, key, shell_module);
	}

	g_strfreev (strv);
}

static void
shell_query_module (EShell *shell,
                    const gchar *filename)
{
	EShellModule *shell_module;
	EShellModuleInfo *info;
	GHashTable *modules_by_name;
	GHashTable *modules_by_scheme;
	const gchar *string;

	shell_module = e_shell_module_new (shell, filename);

	if (!g_type_module_use (G_TYPE_MODULE (shell_module))) {
		g_critical ("Failed to load module: %s", filename);
		g_object_unref (shell_module);
		return;
	}

	shell->priv->loaded_modules = g_list_insert_sorted (
		shell->priv->loaded_modules, shell_module,
		(GCompareFunc) e_shell_module_compare);

	/* Bookkeeping */

	info = (EShellModuleInfo *) shell_module->priv;
	modules_by_name = shell->priv->modules_by_name;
	modules_by_scheme = shell->priv->modules_by_scheme;

	if ((string = info->name) != NULL)
		g_hash_table_insert (
			modules_by_name, (gpointer)
			g_intern_string (string), shell_module);

	if ((string = info->aliases) != NULL)
		shell_split_and_insert_items (
			modules_by_name, string, shell_module);

	if ((string = info->schemes) != NULL)
		shell_split_and_insert_items (
			modules_by_scheme, string, shell_module);
}

static gboolean
shell_shutdown_timeout (EShell *shell)
{
	GList *list, *iter;
	gboolean proceed = TRUE;
	static guint source_id = 0;
	static guint message_timer = 1;

	/* Module list is read-only; do not free. */
	list = e_shell_list_modules (shell);

	/* Any module can defer shutdown if it's still busy. */
	for (iter = list; proceed && iter != NULL; iter = iter->next) {
		EShellModule *shell_module = iter->data;
		proceed = e_shell_module_shutdown (shell_module);

		/* Emit a message every few seconds to indicate
		 * which module(s) we're still waiting on. */
		if (proceed || message_timer == 0)
			continue;

		g_message (
			_("Waiting for the \"%s\" module to finish..."),
			G_TYPE_MODULE (shell_module)->name);
	}

	message_timer = (message_timer + 1) % 10;

	/* If we're go for shutdown, destroy all shell windows.  Note,
	 * we iterate over a /copy/ of the active windows list because
	 * the act of destroying a shell window will modify the active
	 * windows list, which would otherwise derail the iteration. */
	if (proceed) {
		list = g_list_copy (shell->priv->active_windows);
		g_list_foreach (list, (GFunc) gtk_widget_destroy, NULL);
		g_list_free (list);

	/* If a module is still busy, try again after a short delay. */
	} else if (source_id == 0)
		source_id = g_timeout_add (
			SHUTDOWN_TIMEOUT, (GSourceFunc)
			shell_shutdown_timeout, shell);

	/* Return TRUE to repeat the timeout, FALSE to stop it.  This
	 * may seem backwards if the function was called directly. */
	return !proceed;
}

static void
shell_set_property (GObject *object,
                    guint property_id,
                    const GValue *value,
                    GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ONLINE_MODE:
			e_shell_set_online_mode (
				E_SHELL (object),
				g_value_get_boolean (value));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_get_property (GObject *object,
                    guint property_id,
                    GValue *value,
                    GParamSpec *pspec)
{
	switch (property_id) {
		case PROP_ONLINE_MODE:
			g_value_set_boolean (
				value, e_shell_get_online_mode (
				E_SHELL (object)));
			return;
	}

	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_dispose (GObject *object)
{
	EShellPrivate *priv;

	priv = E_SHELL_GET_PRIVATE (object);

	g_list_foreach (
		priv->loaded_modules,
		(GFunc) g_type_module_unuse, NULL);
	g_list_free (priv->loaded_modules);
	priv->loaded_modules = NULL;

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

static void
shell_finalize (GObject *object)
{
	EShellPrivate *priv;

	priv = E_SHELL_GET_PRIVATE (object);

	g_hash_table_destroy (priv->modules_by_name);
	g_hash_table_destroy (priv->modules_by_scheme);

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

static void
shell_constructed (GObject *object)
{
	GDir *dir;
	EShell *shell;
	const gchar *dirname;
	const gchar *basename;
	GError *error = NULL;

	shell = E_SHELL (object);
	dirname = EVOLUTION_MODULEDIR;

	dir = g_dir_open (dirname, 0, &error);
	if (dir == NULL) {
		g_critical ("%s", error->message);
		g_error_free (error);
		return;
	}

	while ((basename = g_dir_read_name (dir)) != NULL) {
		gchar *filename;

		if (!g_str_has_suffix (basename, "." G_MODULE_SUFFIX))
			continue;

		filename = g_build_filename (dirname, basename, NULL);
		shell_query_module (shell, filename);
		g_free (filename);
	}

	g_dir_close (dir);

	e_shell_upgrade_attempt (shell);
}

static void
shell_class_init (EShellClass *class)
{
	GObjectClass *object_class;

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

	object_class = G_OBJECT_CLASS (class);
	object_class->set_property = shell_set_property;
	object_class->get_property = shell_get_property;
	object_class->dispose = shell_dispose;
	object_class->finalize = shell_finalize;
	object_class->constructed = shell_constructed;

	g_object_class_install_property (
		object_class,
		PROP_ONLINE_MODE,
		g_param_spec_boolean (
			"online-mode",
			_("Online Mode"),
			_("Whether the shell is online"),
			TRUE,
			G_PARAM_READWRITE |
			G_PARAM_CONSTRUCT));

	signals[HANDLE_URI] = g_signal_new (
		"handle-uri",
		G_OBJECT_CLASS_TYPE (object_class),
		G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		0, g_signal_accumulator_true_handled, NULL,
		e_marshal_BOOLEAN__STRING,
		G_TYPE_BOOLEAN, 1,
		G_TYPE_STRING);

	signals[SEND_RECEIVE] = g_signal_new (
		"send-receive",
		G_OBJECT_CLASS_TYPE (object_class),
		G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
		0, NULL, NULL,
		g_cclosure_marshal_VOID__OBJECT,
		G_TYPE_NONE, 1,
		GTK_TYPE_WINDOW);

	signals[WINDOW_CREATED] = g_signal_new (
		"window-created",
		G_OBJECT_CLASS_TYPE (object_class),
		G_SIGNAL_RUN_LAST,
		0, NULL, NULL,
		g_cclosure_marshal_VOID__OBJECT,
		G_TYPE_NONE, 1,
		E_TYPE_SHELL_WINDOW);

	signals[WINDOW_DESTROYED] = g_signal_new (
		"window-destroyed",
		G_OBJECT_CLASS_TYPE (object_class),
		G_SIGNAL_RUN_LAST,
		0, NULL, NULL,
		g_cclosure_marshal_VOID__BOOLEAN,
		G_TYPE_NONE, 1,
		G_TYPE_BOOLEAN);
}

static void
shell_init (EShell *shell)
{
	GHashTable *modules_by_name;
	GHashTable *modules_by_scheme;

	shell->priv = E_SHELL_GET_PRIVATE (shell);

	modules_by_name = g_hash_table_new (g_str_hash, g_str_equal);
	modules_by_scheme = g_hash_table_new (g_str_hash, g_str_equal);

	shell->priv->modules_by_name = modules_by_name;
	shell->priv->modules_by_scheme = modules_by_scheme;
	shell->priv->safe_mode = e_file_lock_exists ();

#if NM_SUPPORT
	e_shell_dbus_initialize (shell);
#endif

	e_file_lock_create ();
}

GType
e_shell_get_type (void)
{
	static GType type = 0;

	if (G_UNLIKELY (type == 0)) {
		const GTypeInfo type_info = {
			sizeof (EShellClass),
			(GBaseInitFunc) NULL,
			(GBaseFinalizeFunc) NULL,
			(GClassInitFunc) shell_class_init,
			(GClassFinalizeFunc) NULL,
			NULL,  /* class_data */
			sizeof (EShell),
			0,     /* n_preallocs */
			(GInstanceInitFunc) shell_init,
			NULL   /* value_table */
		};

		type = g_type_register_static (
			G_TYPE_OBJECT, "EShell", &type_info, 0);
	}

	return type;
}

EShell *
e_shell_new (gboolean online_mode)
{
	return g_object_new (E_TYPE_SHELL, "online-mode", online_mode, NULL);
}

GList *
e_shell_list_modules (EShell *shell)
{
	g_return_val_if_fail (E_IS_SHELL (shell), NULL);

	return shell->priv->loaded_modules;
}

const gchar *
e_shell_get_canonical_name (EShell *shell,
                            const gchar *name)
{
	EShellModule *shell_module;

	g_return_val_if_fail (E_IS_SHELL (shell), NULL);

	/* Handle NULL name arguments silently. */
	if (name == NULL)
		return NULL;

	shell_module = e_shell_get_module_by_name (shell, name);

	if (shell_module == NULL)
		return NULL;

	return G_TYPE_MODULE (shell_module)->name;
}

EShellModule *
e_shell_get_module_by_name (EShell *shell,
                            const gchar *name)
{
	GHashTable *hash_table;

	g_return_val_if_fail (E_IS_SHELL (shell), NULL);
	g_return_val_if_fail (name != NULL, NULL);

	hash_table = shell->priv->modules_by_name;

	return g_hash_table_lookup (hash_table, name);
}

EShellModule *
e_shell_get_module_by_scheme (EShell *shell,
                              const gchar *scheme)
{
	GHashTable *hash_table;

	g_return_val_if_fail (E_IS_SHELL (shell), NULL);
	g_return_val_if_fail (scheme != NULL, NULL);

	hash_table = shell->priv->modules_by_scheme;

	return g_hash_table_lookup (hash_table, scheme);
}

GtkWidget *
e_shell_create_window (EShell *shell)
{
	GList *active_windows;
	GtkWidget *shell_window;

	g_return_val_if_fail (E_IS_SHELL (shell), NULL);

	shell_window = e_shell_window_new (shell, shell->priv->safe_mode);

	active_windows = shell->priv->active_windows;
	active_windows = g_list_prepend (active_windows, shell_window);
	shell->priv->active_windows = active_windows;

	g_signal_connect_swapped (
		shell_window, "delete-event",
		G_CALLBACK (shell_window_delete_event_cb), shell);

	g_signal_connect_swapped (
		shell_window, "focus-in-event",
		G_CALLBACK (shell_window_focus_in_event_cb), shell);

	g_object_weak_ref (
		G_OBJECT (shell_window), (GWeakNotify)
		shell_window_weak_notify_cb, shell);

	g_signal_emit (shell, signals[WINDOW_CREATED], 0, shell_window);

	gtk_widget_show (shell_window);

	return shell_window;
}

GtkWidget *
e_shell_get_focused_window (EShell *shell)
{
	g_return_val_if_fail (E_IS_SHELL (shell), NULL);

	if (shell->priv->active_windows == NULL)
		return NULL;

	return GTK_WIDGET (shell->priv->active_windows->data);
}

gboolean
e_shell_handle_uri (EShell *shell,
                    const gchar *uri)
{
	gboolean handled;

	g_return_val_if_fail (E_IS_SHELL (shell), FALSE);
	g_return_val_if_fail (uri != NULL, FALSE);

	g_signal_emit (shell, signals[HANDLE_URI], 0, uri, &handled);

	return handled;
}

void
e_shell_send_receive (EShell *shell,
                      GtkWindow *parent)
{
	g_return_if_fail (E_IS_SHELL (shell));
	g_return_if_fail (GTK_IS_WINDOW (parent));

	g_signal_emit (shell, signals[SEND_RECEIVE], 0, parent);
}

gboolean
e_shell_get_online_mode (EShell *shell)
{
	g_return_val_if_fail (E_IS_SHELL (shell), FALSE);

	return shell->priv->online_mode;
}

void
e_shell_set_online_mode (EShell *shell,
                         gboolean online_mode)
{
	g_return_if_fail (E_IS_SHELL (shell));

	shell->priv->online_mode = online_mode;

	g_object_notify (G_OBJECT (shell), "online-mode");
}

EShellLineStatus
e_shell_get_line_status (EShell *shell)
{
	g_return_val_if_fail (E_IS_SHELL (shell), E_SHELL_LINE_STATUS_OFFLINE);

	return shell->priv->line_status;
}

void
e_shell_set_line_status (EShell *shell,
                         EShellLineStatus status)
{
}

GtkWidget *
e_shell_get_preferences_window (void)
{
	static GtkWidget *preferences_window = NULL;

	if (G_UNLIKELY (preferences_window == NULL))
		preferences_window = e_preferences_window_new ();

	return preferences_window;
}

gboolean
e_shell_is_busy (EShell *shell)
{
	/* FIXME */
	return FALSE;
}

gboolean
e_shell_do_quit (EShell *shell)
{
	/* FIXME */
	return TRUE;
}

gboolean
e_shell_quit (EShell *shell)
{
	/* FIXME */
	return TRUE;
}