/*
Code to build and maintain the status adjustment menuitems.

Copyright 2011 Canonical Ltd.

Authors:
    Ted Gould <ted@canonical.com>

This program is free software: you can redistribute it and/or modify it 
under the terms of the GNU General Public License version 3, as published 
by the Free Software Foundation.

This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranties of 
MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.
*/

#include <glib.h>
#include <glib/gi18n.h>
#include <gio/gio.h>
#include <libdbusmenu-glib/dbusmenu-glib.h>

#include "status-items.h"
#include "status-provider.h"

static const gchar * status_strings [STATUS_PROVIDER_STATUS_LAST] = {
  /* STATUS_PROVIDER_STATUS_ONLINE,    */   N_("Available"),
  /* STATUS_PROVIDER_STATUS_AWAY,      */   N_("Away"),
  /* STATUS_PROVIDER_STATUS_DND        */   N_("Busy"),
  /* STATUS_PROVIDER_STATUS_INVISIBLE  */   N_("Invisible"),
  /* STATUS_PROVIDER_STATUS_OFFLINE,   */   N_("Offline"),
  /* STATUS_PROVIDER_STATUS_DISCONNECTED*/  N_("Offline")
};

static const gchar * status_icons[STATUS_PROVIDER_STATUS_LAST] = {
  /* STATUS_PROVIDER_STATUS_ONLINE, */      "user-available",
  /* STATUS_PROVIDER_STATUS_AWAY, */        "user-away",
  /* STATUS_PROVIDER_STATUS_DND, */         "user-busy",
  /* STATUS_PROVIDER_STATUS_INVISIBLE, */   "user-invisible",
  /* STATUS_PROVIDER_STATUS_OFFLINE */      "user-offline",
  /* STATUS_PROVIDER_STATUS_DISCONNECTED */ "user-offline-panel"
};

static const gchar * panel_icons[STATUS_PROVIDER_STATUS_LAST] = {
  /* STATUS_PROVIDER_STATUS_ONLINE, */      "indicator-messages-user-available",
  /* STATUS_PROVIDER_STATUS_AWAY, */        "indicator-messages-user-away",
  /* STATUS_PROVIDER_STATUS_DND, */         "indicator-messages-user-busy",
  /* STATUS_PROVIDER_STATUS_INVISIBLE, */   "indicator-messages-user-invisible",
  /* STATUS_PROVIDER_STATUS_OFFLINE */      "indicator-messages-user-offline",
  /* STATUS_PROVIDER_STATUS_DISCONNECTED */ "indicator-messages-user-disconnected"
};

static const gchar * panel_active_icons[STATUS_PROVIDER_STATUS_LAST] = {
  /* STATUS_PROVIDER_STATUS_ONLINE, */      "indicator-messages-new-user-available",
  /* STATUS_PROVIDER_STATUS_AWAY, */        "indicator-messages-new-user-away",
  /* STATUS_PROVIDER_STATUS_DND, */         "indicator-messages-new-user-busy",
  /* STATUS_PROVIDER_STATUS_INVISIBLE, */   "indicator-messages-new-user-invisible",
  /* STATUS_PROVIDER_STATUS_OFFLINE */      "indicator-messages-new-user-offline",
  /* STATUS_PROVIDER_STATUS_DISCONNECTED */ "indicator-messages-new-user-disconnected"
};

/* Prototypes */
static gboolean provider_directory_parse (gpointer dir);
static gboolean load_status_provider (gpointer dir);
static void user_status_change (DbusmenuMenuitem * item, guint timestamp, gpointer pstatus);

/* Globals */
static StatusProviderStatus current_status = STATUS_PROVIDER_STATUS_DISCONNECTED;
static GList * menuitems = NULL;
static GList * status_providers = NULL;
static StatusUpdateFunc update_func = NULL;

/* Build the inital status items and start kicking off the async code
   for handling all the statuses */
GList *
status_items_build (StatusUpdateFunc status_update_func)
{
	int i;
	for (i = STATUS_PROVIDER_STATUS_ONLINE; i < STATUS_PROVIDER_STATUS_DISCONNECTED; i++) {
		DbusmenuMenuitem * item = dbusmenu_menuitem_new();

		dbusmenu_menuitem_property_set(item, DBUSMENU_MENUITEM_PROP_LABEL, _(status_strings[i]));
		dbusmenu_menuitem_property_set(item, DBUSMENU_MENUITEM_PROP_ICON_NAME, status_icons[i]);

		dbusmenu_menuitem_property_set_bool(item, DBUSMENU_MENUITEM_PROP_VISIBLE, TRUE);
		dbusmenu_menuitem_property_set_bool(item, DBUSMENU_MENUITEM_PROP_ENABLED, FALSE);

		dbusmenu_menuitem_property_set(item, DBUSMENU_MENUITEM_PROP_TOGGLE_TYPE, DBUSMENU_MENUITEM_TOGGLE_RADIO);
		dbusmenu_menuitem_property_set(item, DBUSMENU_MENUITEM_PROP_TOGGLE_STATE, DBUSMENU_MENUITEM_TOGGLE_STATE_UNCHECKED);

		g_signal_connect(G_OBJECT(item), DBUSMENU_MENUITEM_SIGNAL_ITEM_ACTIVATED, G_CALLBACK(user_status_change), GINT_TO_POINTER(i));

		menuitems = g_list_append(menuitems, item);
	}

	update_func = status_update_func;

	const gchar * status_providers_env = g_getenv("INDICATOR_MESSAGES_STATUS_PROVIDER_DIR");
	if (status_providers_env == NULL) {
		g_idle_add(provider_directory_parse, STATUS_PROVIDER_DIR);
	} else {
		g_idle_add(provider_directory_parse, (gpointer)status_providers_env);
	}

	return menuitems;
}

/* Clean up our globals and stop with all this allocation
   of memory */
void
status_items_cleanup (void)
{
	while (status_providers != NULL) {
		StatusProvider * sprovider = STATUS_PROVIDER(status_providers->data);
		g_object_unref(sprovider);
		status_providers = g_list_remove(status_providers, sprovider);
	}

	return;
}

/* Get the icon that should be shown on the panel */
const gchar *
status_current_panel_icon (gboolean alert)
{
	if (alert) {
		return panel_active_icons[current_status];
	} else {
		return panel_icons[current_status];
	}
}

/* Update status from all the providers */
static void
update_status (void)
{
	StatusProviderStatus status = STATUS_PROVIDER_STATUS_DISCONNECTED;
	GList * provider;

	for (provider = status_providers; provider != NULL; provider = g_list_next(provider)) {
		StatusProviderStatus localstatus = status_provider_get_status(STATUS_PROVIDER(provider->data));

		if (localstatus < status) {
			status = localstatus;
		}
	}

	if (status == current_status) {
		return;
	}

	current_status = status;

	if (update_func != NULL) {
		update_func();
	}

	GList * menu;
	int i;
	for (menu = menuitems, i = 0; menu != NULL && i < STATUS_PROVIDER_STATUS_DISCONNECTED; menu = g_list_next(menu), i++) {
		/* If we're the seleced status or if we're disconnected
		   show the user that we're offline */
		if (i == current_status || (current_status == STATUS_PROVIDER_STATUS_DISCONNECTED && i == STATUS_PROVIDER_STATUS_OFFLINE)) {
			dbusmenu_menuitem_property_set_int(DBUSMENU_MENUITEM(menu->data), DBUSMENU_MENUITEM_PROP_TOGGLE_STATE, DBUSMENU_MENUITEM_TOGGLE_STATE_CHECKED);
		} else {
			dbusmenu_menuitem_property_set_int(DBUSMENU_MENUITEM(menu->data), DBUSMENU_MENUITEM_PROP_TOGGLE_STATE, DBUSMENU_MENUITEM_TOGGLE_STATE_UNCHECKED);
		}

		if (current_status == STATUS_PROVIDER_STATUS_DISCONNECTED) {
			dbusmenu_menuitem_property_set_bool(DBUSMENU_MENUITEM(menu->data), DBUSMENU_MENUITEM_PROP_ENABLED, FALSE);
		} else {
			dbusmenu_menuitem_property_set_bool(DBUSMENU_MENUITEM(menu->data), DBUSMENU_MENUITEM_PROP_ENABLED, TRUE);
		}
	}

	return;
}

/* Handle the user requesting a status change */
static void
user_status_change (DbusmenuMenuitem * item, guint timestamp, gpointer pstatus)
{
	StatusProviderStatus status = GPOINTER_TO_INT(pstatus);
	GList * provider;

	/* Set each provider to this status */
	for (provider = status_providers; provider != NULL; provider = g_list_next(provider)) {
		status_provider_set_status(STATUS_PROVIDER(provider->data), status);
	}

	/* See what we really are now */
	update_status();
	return;
}

/* Start parsing a directory and setting up the entires in the idle loop */
static gboolean
provider_directory_parse (gpointer directory)
{
	const gchar * dirname = (const gchar *)directory;
	g_debug("Looking for status providers in: %s", dirname);

	if (!g_file_test(dirname, G_FILE_TEST_EXISTS)) {
		return FALSE;
	}

	GDir * dir = g_dir_open(dirname, 0, NULL);
	if (dir == NULL) {
		return FALSE;
	}

	const gchar * name;
	while ((name = g_dir_read_name(dir)) != NULL) {
		if (!g_str_has_suffix(name, G_MODULE_SUFFIX)) {
			continue;
		}

		gchar * fullname = g_build_filename(dirname, name, NULL);
		g_idle_add(load_status_provider, fullname);
	}

	g_dir_close(dir);

	return FALSE;
}

/* Close the module as an idle function so that we know
   it's all cleaned up */
static gboolean
module_destroy_in_idle_helper (gpointer data)
{
	GModule * module = (GModule *)data;
	if (module != NULL) {
		g_debug("Unloading module: %s", g_module_name(module));
		g_module_close(module);
	}
	return FALSE;
}

/* Set up an idle function to close the module */
static void
module_destroy_in_idle (gpointer data)
{
	g_idle_add_full(G_PRIORITY_LOW, module_destroy_in_idle_helper, data, NULL);
	return;
}

/* Load a particular status provider */
static gboolean
load_status_provider (gpointer dir)
{
	gchar * provider = dir;

	if (!g_file_test(provider, G_FILE_TEST_EXISTS)) {
		goto exit_final;
	}

	g_debug("Loading status provider: %s", provider);

	GModule * module;

	module = g_module_open(provider, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
	if (module == NULL) {
		g_warning("Unable to open module: %s", provider);
		goto exit_module_fail;
	}

	/* Got it */
	GType (*type_func) (void);
	if (!g_module_symbol(module, STATUS_PROVIDER_EXPORT_S, (gpointer *)&type_func)) {
		g_warning("Unable to find type symbol in: %s", provider);
		goto exit_module_fail;
	}

	GType provider_type = type_func();
	if (provider_type == 0) {
		g_warning("Unable to create type from: %s", provider);
		goto exit_module_fail;
	}

	StatusProvider * sprovider = STATUS_PROVIDER(g_object_new(provider_type, NULL));
	if (sprovider == NULL) {
		g_warning("Unable to build provider from: %s", provider);
		goto exit_module_fail;
	}

	/* On update let's talk to all of them and create the aggregate
	   value to export */
	g_signal_connect(G_OBJECT(sprovider), STATUS_PROVIDER_SIGNAL_STATUS_CHANGED, G_CALLBACK(update_status), NULL);

	/* Attach the module object to the status provider so
	   that when the status provider is free'd the module
	   is closed automatically. */
	g_object_set_data_full(G_OBJECT(sprovider), "status-provider-module", module, module_destroy_in_idle);

	status_providers = g_list_prepend(status_providers, sprovider);

	/* Force an update to ensure a consistent state*/
	update_status();

	goto exit_final;

exit_module_fail:
	g_module_close(module);

exit_final:
	g_free(provider);
	return FALSE;
}