/*
 * e-mail-shell-backend.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)
 *
 */

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-mail-shell-backend.h"

#include <glib/gi18n.h>

#include "e-util/e-import.h"
#include "e-util/e-util.h"
#include "shell/e-shell.h"
#include "shell/e-shell-window.h"
#include "composer/e-msg-composer.h"
#include "widgets/misc/e-preferences-window.h"
#include "widgets/misc/e-web-view.h"

#include "e-mail-shell-settings.h"
#include "e-mail-shell-sidebar.h"
#include "e-mail-shell-view.h"

#include "e-mail-browser.h"
#include "e-mail-folder-utils.h"
#include "e-mail-reader.h"
#include "e-mail-session.h"
#include "e-mail-store.h"
#include "em-account-editor.h"
#include "em-account-prefs.h"
#include "em-composer-prefs.h"
#include "em-composer-utils.h"
#include "em-folder-utils.h"
#include "em-format-hook.h"
#include "em-format-html-display.h"
#include "em-mailer-prefs.h"
#include "em-network-prefs.h"
#include "em-utils.h"
#include "mail-config.h"
#include "mail-ops.h"
#include "mail-send-recv.h"
#include "mail-vfolder.h"
#include "importers/mail-importer.h"

#define BACKEND_NAME "mail"

struct _EMailShellBackendPrivate {
	gint mail_sync_in_progress;
	guint mail_sync_source_id;
};

static gpointer parent_class;
static GType mail_shell_backend_type;

static void mbox_create_preview_cb (GObject *preview, GtkWidget **preview_widget);
static void mbox_fill_preview_cb (GObject *preview, CamelMimeMessage *msg);

static void
mail_shell_backend_init_importers (void)
{
	EImportClass *import_class;
	EImportImporter *importer;

	import_class = g_type_class_ref (e_import_get_type ());

	importer = mbox_importer_peek ();
	e_import_class_add_importer (import_class, importer, NULL, NULL);
	mbox_importer_set_preview_funcs (
		mbox_create_preview_cb, mbox_fill_preview_cb);

	importer = elm_importer_peek ();
	e_import_class_add_importer (import_class, importer, NULL, NULL);

	importer = pine_importer_peek ();
	e_import_class_add_importer (import_class, importer, NULL, NULL);
}

static void
mail_shell_backend_mail_icon_cb (EShellWindow *shell_window,
                                 const gchar *icon_name)
{
	GtkAction *action;

	action = e_shell_window_get_shell_view_action (
		shell_window, BACKEND_NAME);
	gtk_action_set_icon_name (action, icon_name);
}

static void
action_mail_folder_new_cb (GtkAction *action,
                           EShellWindow *shell_window)
{
	EMFolderTree *folder_tree = NULL;
	EMailShellSidebar *mail_shell_sidebar;
	EMailBackend *backend;
	EShellSidebar *shell_sidebar;
	EShellView *shell_view;
	const gchar *view_name;

	/* Take care not to unnecessarily load the mail shell view. */
	view_name = e_shell_window_get_active_view (shell_window);
	if (g_strcmp0 (view_name, BACKEND_NAME) != 0) {
		EShellBackend *shell_backend;
		EShell *shell;

		shell = e_shell_window_get_shell (shell_window);

		shell_backend =
			e_shell_get_backend_by_name (shell, BACKEND_NAME);
		g_return_if_fail (E_IS_MAIL_BACKEND (shell_backend));

		backend = E_MAIL_BACKEND (shell_backend);

		goto exit;
	}

	shell_view = e_shell_window_get_shell_view (shell_window, view_name);
	shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);

	mail_shell_sidebar = E_MAIL_SHELL_SIDEBAR (shell_sidebar);
	folder_tree = e_mail_shell_sidebar_get_folder_tree (mail_shell_sidebar);
	backend = em_folder_tree_get_backend (folder_tree);

exit:
	em_folder_utils_create_folder (
		GTK_WINDOW (shell_window), backend, folder_tree, NULL);
}

static void
action_mail_message_new_cb (GtkAction *action,
                            EShellWindow *shell_window)
{
	EMailShellSidebar *mail_shell_sidebar;
	EShellSidebar *shell_sidebar;
	EShellView *shell_view;
	EShell *shell;
	EMFolderTree *folder_tree;
	CamelFolder *folder = NULL;
	CamelStore *store;
	const gchar *view_name;
	gchar *folder_name;

	shell = e_shell_window_get_shell (shell_window);

	if (!em_utils_check_user_can_send_mail ())
		return;

	/* Take care not to unnecessarily load the mail shell view. */
	view_name = e_shell_window_get_active_view (shell_window);
	if (g_strcmp0 (view_name, BACKEND_NAME) != 0)
		goto exit;

	shell_view = e_shell_window_get_shell_view (shell_window, view_name);
	shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);

	mail_shell_sidebar = E_MAIL_SHELL_SIDEBAR (shell_sidebar);
	folder_tree = e_mail_shell_sidebar_get_folder_tree (mail_shell_sidebar);

	if (em_folder_tree_get_selected (folder_tree, &store, &folder_name)) {

		/* FIXME This blocks and is not cancellable. */
		folder = camel_store_get_folder_sync (
			store, folder_name, 0, NULL, NULL);

		g_object_unref (store);
		g_free (folder_name);
	}

exit:
	em_utils_compose_new_message (shell, folder);
}

static GtkActionEntry item_entries[] = {

	{ "mail-message-new",
	  "mail-message-new",
	  NC_("New", "_Mail Message"),
	  "<Shift><Control>m",
	  N_("Compose a new mail message"),
	  G_CALLBACK (action_mail_message_new_cb) }
};

static GtkActionEntry source_entries[] = {

	{ "mail-folder-new",
	  "folder-new",
	  NC_("New", "Mail _Folder"),
	  NULL,
	  N_("Create a new mail folder"),
	  G_CALLBACK (action_mail_folder_new_cb) }
};

static void
mail_shell_backend_sync_store_done_cb (CamelStore *store,
                                       gpointer user_data)
{
	EMailShellBackend *mail_shell_backend = user_data;

	mail_shell_backend->priv->mail_sync_in_progress--;
}

static void
mail_shell_backend_sync_store_cb (CamelStore *store,
                                  EMailShellBackend *mail_shell_backend)
{
	mail_shell_backend->priv->mail_sync_in_progress++;

	mail_sync_store (
		store, FALSE,
		mail_shell_backend_sync_store_done_cb,
		mail_shell_backend);
}

static gboolean
mail_shell_backend_mail_sync (EMailShellBackend *mail_shell_backend)
{
	EShell *shell;
	EShellBackend *shell_backend;

	shell_backend = E_SHELL_BACKEND (mail_shell_backend);
	shell = e_shell_backend_get_shell (shell_backend);

	/* Obviously we can only sync in online mode. */
	if (!e_shell_get_online (shell))
		goto exit;

	/* If a sync is still in progress, skip this round. */
	if (mail_shell_backend->priv->mail_sync_in_progress)
		goto exit;

	e_mail_store_foreach (
		E_MAIL_BACKEND (mail_shell_backend),
		(GFunc) mail_shell_backend_sync_store_cb,
		mail_shell_backend);

exit:
	return TRUE;
}

static gboolean
mail_shell_backend_handle_uri_cb (EShell *shell,
                                  const gchar *uri,
                                  EMailShellBackend *mail_shell_backend)
{
	gboolean handled = FALSE;

	if (g_str_has_prefix (uri, "mailto:")) {
		if (em_utils_check_user_can_send_mail ())
			em_utils_compose_new_message_with_mailto (
				shell, uri, NULL);
		handled = TRUE;
	}

	return handled;
}

static void
mail_shell_backend_prepare_for_quit_cb (EShell *shell,
                                        EActivity *activity,
                                        EShellBackend *shell_backend)
{
	EMailShellBackendPrivate *priv;

	priv = E_MAIL_SHELL_BACKEND (shell_backend)->priv;

	/* Prevent a sync from starting while trying to shutdown. */
	if (priv->mail_sync_source_id > 0) {
		g_source_remove (priv->mail_sync_source_id);
		priv->mail_sync_source_id = 0;
	}
}

static void
mail_shell_backend_window_weak_notify_cb (EShell *shell,
                                          GObject *where_the_object_was)
{
	g_signal_handlers_disconnect_by_func (
		shell, mail_shell_backend_mail_icon_cb,
		where_the_object_was);
}

static void
mail_shell_backend_window_added_cb (GtkApplication *application,
                                    GtkWindow *window,
                                    EShellBackend *shell_backend)
{
	EShell *shell = E_SHELL (application);
	const gchar *backend_name;

	/* This applies to both the composer and signature editor. */
	if (GTKHTML_IS_EDITOR (window)) {
		EShellSettings *shell_settings;
		GList *spell_languages;
		gboolean active = TRUE;

		spell_languages = e_load_spell_languages ();
		gtkhtml_editor_set_spell_languages (
			GTKHTML_EDITOR (window), spell_languages);
		g_list_free (spell_languages);

		shell_settings = e_shell_get_shell_settings (shell);

		/* Express mode does not honor this setting. */
		if (!e_shell_get_express_mode (shell))
			active = e_shell_settings_get_boolean (
				shell_settings, "composer-format-html");

		gtkhtml_editor_set_html_mode (GTKHTML_EDITOR (window), active);
	}

	if (E_IS_MSG_COMPOSER (window)) {
		/* Start the mail backend if it isn't already.  This
		 * may be necessary when opening a new composer window
		 * from a shell view other than mail. */
		e_shell_backend_start (shell_backend);

		/* Integrate the new composer into the mail module. */
		em_configure_new_composer (E_MSG_COMPOSER (window));
		return;
	}

	if (!E_IS_SHELL_WINDOW (window))
		return;

	backend_name = E_SHELL_BACKEND_GET_CLASS (shell_backend)->name;

	e_shell_window_register_new_item_actions (
		E_SHELL_WINDOW (window), backend_name,
		item_entries, G_N_ELEMENTS (item_entries));

	e_shell_window_register_new_source_actions (
		E_SHELL_WINDOW (window), backend_name,
		source_entries, G_N_ELEMENTS (source_entries));

	g_signal_connect_swapped (
		shell, "event::mail-icon",
		G_CALLBACK (mail_shell_backend_mail_icon_cb), window);

	g_object_weak_ref (
		G_OBJECT (window), (GWeakNotify)
		mail_shell_backend_window_weak_notify_cb, shell);
}

static void
mail_shell_backend_constructed (GObject *object)
{
	EShell *shell;
	EShellBackend *shell_backend;
	GtkWidget *preferences_window;

	shell_backend = E_SHELL_BACKEND (object);
	shell = e_shell_backend_get_shell (shell_backend);

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

	/* Register format types for EMFormatHook. */
	em_format_hook_register_type (em_format_get_type ());
	em_format_hook_register_type (em_format_html_get_type ());
	em_format_hook_register_type (em_format_html_display_get_type ());

	/* Register plugin hook types. */
	em_format_hook_get_type ();

	mail_shell_backend_init_importers ();

	g_signal_connect (
		shell, "handle-uri",
		G_CALLBACK (mail_shell_backend_handle_uri_cb),
		shell_backend);

	g_signal_connect (
		shell, "prepare-for-quit",
		G_CALLBACK (mail_shell_backend_prepare_for_quit_cb),
		shell_backend);

	g_signal_connect (
		shell, "window-added",
		G_CALLBACK (mail_shell_backend_window_added_cb),
		shell_backend);

	e_mail_shell_settings_init (shell_backend);

	/* Setup preference widget factories */
	preferences_window = e_shell_get_preferences_window (shell);

	e_preferences_window_add_page (
		E_PREFERENCES_WINDOW (preferences_window),
		"mail-accounts",
		"preferences-mail-accounts",
		_("Mail Accounts"),
		em_account_prefs_new,
		100);

	e_preferences_window_add_page (
		E_PREFERENCES_WINDOW (preferences_window),
		"mail",
		"preferences-mail",
		_("Mail Preferences"),
		em_mailer_prefs_new,
		300);

	e_preferences_window_add_page (
		E_PREFERENCES_WINDOW (preferences_window),
		"composer",
		"preferences-composer",
		_("Composer Preferences"),
		em_composer_prefs_new,
		400);

	e_preferences_window_add_page (
		E_PREFERENCES_WINDOW (preferences_window),
		"system-network-proxy",
		"preferences-system-network-proxy",
		_("Network Preferences"),
		em_network_prefs_new,
		500);
}

static void
mail_shell_backend_start (EShellBackend *shell_backend)
{
	EMailShellBackendPrivate *priv;
	EShell *shell;
	EShellSettings *shell_settings;
	EMailBackend *backend;
	gboolean enable_search_folders;
	const gchar *data_dir;

	priv = E_MAIL_SHELL_BACKEND (shell_backend)->priv;

	shell = e_shell_backend_get_shell (shell_backend);
	shell_settings = e_shell_get_shell_settings (shell);

	backend = E_MAIL_BACKEND (shell_backend);
	data_dir = e_shell_backend_get_data_dir (shell_backend);

	e_mail_store_init (backend, data_dir);

	enable_search_folders = e_shell_settings_get_boolean (
		shell_settings, "mail-enable-search-folders");
	if (enable_search_folders)
		vfolder_load_storage (backend);

	mail_autoreceive_init (backend);

	if (g_getenv ("CAMEL_FLUSH_CHANGES") != NULL)
		priv->mail_sync_source_id = g_timeout_add_seconds (
			mail_config_get_sync_timeout (),
			(GSourceFunc) mail_shell_backend_mail_sync,
			shell_backend);
}

static gboolean
mail_shell_backend_delete_junk_policy_decision (EMailBackend *backend)
{
	EShell *shell;
	EShellSettings *shell_settings;
	GConfClient *client;
	const gchar *key;
	gboolean delete_junk;
	gint empty_date;
	gint empty_days;
	gint now;
	GError *error = NULL;

	shell = e_shell_backend_get_shell (E_SHELL_BACKEND (backend));

	client = e_shell_get_gconf_client (shell);
	shell_settings = e_shell_get_shell_settings (shell);

	now = time (NULL) / 60 / 60 / 24;

	delete_junk = e_shell_settings_get_boolean (
		shell_settings, "mail-empty-junk-on-exit");

	/* XXX No EShellSettings properties for these keys. */

	empty_date = empty_days = 0;

	if (delete_junk) {
		key = "/apps/evolution/mail/junk/empty_on_exit_days";
		empty_days = gconf_client_get_int (client, key, &error);
		if (error != NULL) {
			g_warning ("%s", error->message);
			g_error_free (error);
			return FALSE;
		}
	}

	if (delete_junk) {
		key = "/apps/evolution/mail/junk/empty_date";
		empty_date = gconf_client_get_int (client, key, &error);
		if (error != NULL) {
			g_warning ("%s", error->message);
			g_error_free (error);
			return FALSE;
		}
	}

	delete_junk &= (empty_days == 0) || (empty_date + empty_days <= now);

	if (delete_junk) {
		key = "/apps/evolution/mail/junk/empty_date";
		gconf_client_set_int (client, key, now, NULL);
	}

	return delete_junk;
}

static gboolean
mail_shell_backend_empty_trash_policy_decision (EMailBackend *backend)
{
	EShell *shell;
	EShellSettings *shell_settings;
	GConfClient *client;
	const gchar *key;
	gboolean empty_trash;
	gint empty_date;
	gint empty_days;
	gint now;
	GError *error = NULL;

	shell = e_shell_backend_get_shell (E_SHELL_BACKEND (backend));

	client = e_shell_get_gconf_client (shell);
	shell_settings = e_shell_get_shell_settings (shell);

	now = time (NULL) / 60 / 60 / 24;

	empty_trash = e_shell_settings_get_boolean (
		shell_settings, "mail-empty-trash-on-exit");

	/* XXX No EShellSettings properties for these keys. */

	empty_date = empty_days = 0;

	if (empty_trash) {
		key = "/apps/evolution/mail/trash/empty_on_exit_days";
		empty_days = gconf_client_get_int (client, key, &error);
		if (error != NULL) {
			g_warning ("%s", error->message);
			g_error_free (error);
			return FALSE;
		}
	}

	if (empty_trash) {
		key = "/apps/evolution/mail/trash/empty_date";
		empty_date = gconf_client_get_int (client, key, &error);
		if (error != NULL) {
			g_warning ("%s", error->message);
			g_error_free (error);
			return FALSE;
		}
	}

	empty_trash &= (empty_days == 0) || (empty_date + empty_days <= now);

	if (empty_trash) {
		key = "/apps/evolution/mail/trash/empty_date";
		gconf_client_set_int (client, key, now, NULL);
	}

	return empty_trash;
}

static void
mail_shell_backend_class_init (EMailShellBackendClass *class)
{
	GObjectClass *object_class;
	EShellBackendClass *shell_backend_class;
	EMailBackendClass *mail_backend_class;

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

	object_class = G_OBJECT_CLASS (class);
	object_class->constructed = mail_shell_backend_constructed;

	shell_backend_class = E_SHELL_BACKEND_CLASS (class);
	shell_backend_class->shell_view_type = E_TYPE_MAIL_SHELL_VIEW;
	shell_backend_class->name = BACKEND_NAME;
	shell_backend_class->aliases = "";
	shell_backend_class->schemes = "mailto:email";
	shell_backend_class->sort_order = 200;
	shell_backend_class->preferences_page = "mail-accounts";
	shell_backend_class->start = mail_shell_backend_start;

	mail_backend_class = E_MAIL_BACKEND_CLASS (class);
	mail_backend_class->delete_junk_policy_decision =
		mail_shell_backend_delete_junk_policy_decision;
	mail_backend_class->empty_trash_policy_decision =
		mail_shell_backend_empty_trash_policy_decision;
}

static void
mail_shell_backend_init (EMailShellBackend *mail_shell_backend)
{
	mail_shell_backend->priv = G_TYPE_INSTANCE_GET_PRIVATE (
		mail_shell_backend, E_TYPE_MAIL_SHELL_BACKEND,
		EMailShellBackendPrivate);
}

GType
e_mail_shell_backend_get_type (void)
{
	return mail_shell_backend_type;
}

void
e_mail_shell_backend_register_type (GTypeModule *type_module)
{
	const GTypeInfo type_info = {
		sizeof (EMailShellBackendClass),
		(GBaseInitFunc) NULL,
		(GBaseFinalizeFunc) NULL,
		(GClassInitFunc) mail_shell_backend_class_init,
		(GClassFinalizeFunc) NULL,
		NULL,  /* class_data */
		sizeof (EMailShellBackend),
		0,     /* n_preallocs */
		(GInstanceInitFunc) mail_shell_backend_init,
		NULL   /* value_table */
	};

	mail_shell_backend_type = g_type_module_register_type (
		type_module, E_TYPE_MAIL_BACKEND,
		"EMailShellBackend", &type_info, 0);
}

/******************* Code below here belongs elsewhere. *******************/

#include "filter/e-filter-option.h"
#include "shell/e-shell-settings.h"
#include "mail/e-mail-label-list-store.h"

GSList *
e_mail_labels_get_filter_options (void)
{
	EShell *shell;
	EShellSettings *shell_settings;
	EMailLabelListStore *list_store;
	GtkTreeModel *model;
	GtkTreeIter iter;
	GSList *list = NULL;
	gboolean valid;

	shell = e_shell_get_default ();
	shell_settings = e_shell_get_shell_settings (shell);
	list_store = e_shell_settings_get_object (
		shell_settings, "mail-label-list-store");

	model = GTK_TREE_MODEL (list_store);
	valid = gtk_tree_model_get_iter_first (model, &iter);

	while (valid) {
		struct _filter_option *option;
		gchar *name, *tag;

		name = e_mail_label_list_store_get_name (list_store, &iter);
		tag = e_mail_label_list_store_get_tag (list_store, &iter);

		if (g_str_has_prefix (tag, "$Label")) {
			gchar *tmp = tag;

			tag = g_strdup (tag + 6);

			g_free (tmp);
		}

		option = g_new0 (struct _filter_option, 1);
		option->title = e_str_without_underscores (name);
		option->value = tag;  /* takes ownership */
		list = g_slist_prepend (list, option);

		g_free (name);

		valid = gtk_tree_model_iter_next (model, &iter);
	}

	g_object_unref (list_store);

	return g_slist_reverse (list);
}

/* utility functions for mbox importer */
static void
mbox_create_preview_cb (GObject *preview,
                        GtkWidget **preview_widget)
{
	EMFormatHTMLDisplay *format;
	EWebView *web_view;

	g_return_if_fail (preview != NULL);
	g_return_if_fail (preview_widget != NULL);

	format = em_format_html_display_new ();
	g_object_set_data_full (
		preview, "mbox-imp-formatter", format, g_object_unref);
	web_view = em_format_html_get_web_view (EM_FORMAT_HTML (format));

	*preview_widget = GTK_WIDGET (web_view);
}

static void
mbox_fill_preview_cb (GObject *preview,
                      CamelMimeMessage *msg)
{
	EMFormatHTMLDisplay *format;

	g_return_if_fail (preview != NULL);
	g_return_if_fail (msg != NULL);

	format = g_object_get_data (preview, "mbox-imp-formatter");
	g_return_if_fail (format != NULL);

	/* FIXME Not passing a GCancellable here. */
	em_format_format (EM_FORMAT (format), NULL, NULL, msg, NULL);
}