/*  XMMS2 - X Music Multiplexer System
 *  Copyright (C) 2003-2007 XMMS2 Team
 *
 *  PLUGINS ARE NOT CONSIDERED TO BE DERIVED WORK !!!
 *
 *  This library 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 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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.
 */


/** @file
 * This file controls the XMMS2 main loop.
 */

#include <glib.h>

/* scons takes care of this too, this is just an extra check */
#if !GLIB_CHECK_VERSION(2,6,0)
# error You need atleast glib 2.6.0
#endif

#include "xmms_configuration.h"
#include "xmmsc/xmmsc_util.h"
#include "xmmspriv/xmms_plugin.h"
#include "xmmspriv/xmms_config.h"
#include "xmmspriv/xmms_playlist.h"
#include "xmmspriv/xmms_collection.h"
#include "xmmspriv/xmms_signal.h"
#include "xmmspriv/xmms_medialib.h"
#include "xmmspriv/xmms_output.h"
#include "xmmspriv/xmms_ipc.h"
#include "xmmspriv/xmms_log.h"
#include "xmmspriv/xmms_sqlite.h"
#include "xmmspriv/xmms_xform.h"
#include "xmmspriv/xmms_bindata.h"
#include "xmmspriv/xmms_utils.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>

#include <pthread.h>

/*
 * Forward declarations of the methods in the main object
 */
static void quit (xmms_object_t *object, xmms_error_t *error);
static GHashTable *stats (xmms_object_t *object, xmms_error_t *error);
static guint hello (xmms_object_t *object, guint protocolver, gchar *client, xmms_error_t *error);
static void install_scripts (const gchar *into_dir);
static xmms_xform_object_t *xform_obj;
static xmms_bindata_t *bindata_obj;

XMMS_CMD_DEFINE (quit, quit, xmms_object_t*, NONE, NONE, NONE);
XMMS_CMD_DEFINE (hello, hello, xmms_object_t *, UINT32, UINT32, STRING);
XMMS_CMD_DEFINE (stats, stats, xmms_object_t *, DICT, NONE, NONE);
XMMS_CMD_DEFINE (plugin_list, xmms_plugin_client_list, xmms_object_t *, LIST, UINT32, NONE);

/** @defgroup XMMSServer XMMSServer
  * @brief look at this if you want to code inside the server.
  * The XMMS2 project is split into a server and a multiple clients.
  * This documents the server part.
  */

/**
  * @defgroup Main Main
  * @ingroup XMMSServer
  * @brief main object
  * @{
  */


/**
 * Main object, when this is unreffed, XMMS2 is quiting.
 */
struct xmms_main_St {
	xmms_object_t object;
	xmms_output_t *output;
	time_t starttime;
};

typedef struct xmms_main_St xmms_main_t;

/** This is the mainloop of the xmms2 server */
static GMainLoop *mainloop;

/** The path of the configfile */
static gchar *conffile = NULL;

/**
 * This returns the main stats for the server
 */
static GHashTable *
stats (xmms_object_t *object, xmms_error_t *error)
{
	gint starttime;
	GHashTable *ret = g_hash_table_new_full (g_str_hash, g_str_equal,
	                                         g_free, xmms_object_cmd_value_free);

	starttime = ((xmms_main_t*)object)->starttime;

	g_hash_table_insert (ret, g_strdup ("version"),
	                     xmms_object_cmd_value_str_new (XMMS_VERSION));
	g_hash_table_insert (ret, g_strdup ("uptime"),
	                     xmms_object_cmd_value_int_new (time (NULL)-starttime));

	return ret;
}

/**
 * @internal Execute all programs or scripts in a directory. Used when starting
 * up and shutting down the daemon.
 *
 * @param[in] scriptdir Directory to search for executable programs/scripts.
 * started.
 */
static void
do_scriptdir (const gchar *scriptdir)
{
	GError *err = NULL;
	GDir *dir;
	const gchar *f;
	gchar *argv[2] = {NULL, NULL};

	XMMS_DBG ("Running scripts in %s", scriptdir);
	if (!g_file_test (scriptdir, G_FILE_TEST_IS_DIR)) {
		g_mkdir_with_parents (scriptdir, 0755);
		install_scripts (scriptdir);
	}

	dir = g_dir_open (scriptdir, 0, &err);
	if (!dir) {
		xmms_log_error ("Could not open script dir '%s' error: %s", scriptdir, err->message);
		return;
	}

	while ((f = g_dir_read_name (dir))) {
		argv[0] = g_strdup_printf ("%s/%s", scriptdir, f);
		if (g_file_test (argv[0], G_FILE_TEST_IS_EXECUTABLE)) {
			g_spawn_async (g_get_home_dir (),
			               argv, NULL, 0,
			               NULL, NULL, NULL, &err);
		}
		g_free (argv[0]);
	}

	g_dir_close (dir);

}

/**
 * @internal Load the xmms2d configuration file. Creates the config directory
 * if needed.
 */
static void
load_config ()
{
	gchar *configdir = g_malloc0 (PATH_MAX);

	if (!conffile) {
		conffile = XMMS_BUILD_PATH ("xmms2.conf");
	}

	g_assert (strlen (conffile) <= XMMS_MAX_CONFIGFILE_LEN);

	if (!xmms_userconfdir_get (configdir, PATH_MAX))
		xmms_log_error ("Could not get path to config dir");
	if (!g_file_test (configdir, G_FILE_TEST_IS_DIR)) {
		g_mkdir_with_parents (configdir, 0755);
	}
	g_free (configdir);

	xmms_config_init (conffile);
}

/**
 * @internal Switch to using another output plugin
 * @param object An object
 * @param data The name of the output plugin to switch to
 * @param userdata The #xmms_main_t object
 */
static void
change_output (xmms_object_t *object, gconstpointer data, gpointer userdata)
{
	xmms_output_plugin_t *plugin;
	xmms_main_t *mainobj = (xmms_main_t*)userdata;
	gchar *outname = (gchar *) data;

	if (!mainobj->output)
		return;

	xmms_log_info ("Switching to output %s", outname);

	plugin = (xmms_output_plugin_t *)xmms_plugin_find (XMMS_PLUGIN_TYPE_OUTPUT, outname);
	if (!plugin) {
		xmms_log_error ("Baaaaad output plugin, try to change the output.plugin config variable to something usefull");
	} else {
		if (!xmms_output_plugin_switch (mainobj->output, plugin)) {
			xmms_log_error ("Baaaaad output plugin, try to change the output.plugin config variable to something usefull");
		}
	}
}

/**
 * @internal Destroy the main object
 * @param[in] object The object to destroy
 */
static void
xmms_main_destroy (xmms_object_t *object)
{
	xmms_main_t *mainobj = (xmms_main_t *) object;
	xmms_object_cmd_arg_t arg;
	xmms_config_property_t *cv;

	cv = xmms_config_lookup ("core.shutdownpath");
	do_scriptdir (xmms_config_property_get_string (cv));

	/* stop output */
	xmms_object_cmd_arg_init (&arg);

	xmms_object_cmd_call (XMMS_OBJECT (mainobj->output),
	                      XMMS_IPC_CMD_STOP, &arg);

	g_usleep (G_USEC_PER_SEC); /* wait for the output thread to end */
	xmms_object_unref (mainobj->output);

	xmms_object_unref (xform_obj);

	g_assert (conffile != NULL);
	xmms_config_save (conffile);

	xmms_config_shutdown ();
	xmms_plugin_shutdown ();

	xmms_ipc_object_unregister (XMMS_IPC_OBJECT_MAIN);
	xmms_ipc_shutdown ();

	xmms_log_shutdown ();
}

/**
 * @internal Function to respond to the 'hello' sent from clients on connect
 */
static guint
hello (xmms_object_t *object, guint protocolver, gchar *client, xmms_error_t *error)
{
	XMMS_DBG ("Client %s with protocol version %d sent hello!", client, protocolver);
	return 1;
}

static gboolean
kill_server (gpointer object) {
	xmms_object_emit_f (XMMS_OBJECT (object),
	                    XMMS_IPC_SIGNAL_QUIT,
	                    XMMS_OBJECT_CMD_ARG_UINT32,
	                    time (NULL)-((xmms_main_t*)object)->starttime);

	xmms_object_unref (object);

	exit (EXIT_SUCCESS);
}


/**
 * @internal Function to respond to the 'quit' command sent from a client
 */
static void
quit (xmms_object_t *object, xmms_error_t *error)
{
	/*
	 * to be able to return from this method
	 * we add a timeout that will kill the server
	 * very "ugly"
	 */
	g_timeout_add (1, kill_server, object);
}

static gboolean
symlink_file (gchar *source, gchar *dest)
{
	gint r;

	g_return_val_if_fail (source, FALSE);
	g_return_val_if_fail (dest, FALSE);

	r = symlink (source, dest);

	return r != -1;
}

static void
install_scripts (const gchar *into_dir)
{
	GDir *dir;
	GError *err = NULL;
	gchar path[PATH_MAX];
	const gchar *f;
	gchar *s;

	s = strrchr (into_dir, '/');
	if (!s)
		return;

	s++;

	g_snprintf (path, PATH_MAX, "%s/scripts/%s", SHAREDDIR, s);
	xmms_log_info ("Installing scripts from %s", path);
	dir = g_dir_open (path, 0, &err);
	if (!dir) {
		xmms_log_error ("Global script directory not found");
		return;
	}

	while ((f = g_dir_read_name (dir))) {
		gchar *source = g_strdup_printf ("%s/%s", path, f);
		gchar *dest = g_strdup_printf ("%s/%s", into_dir, f);
		if (!symlink_file (source, dest)) {
			break;
		}
		g_free (source);
		g_free (dest);
	}

	g_dir_close (dir);
}

/**
 * Just print version and quit
 */
void
print_version ()
{
	printf ("XMMS2 version " XMMS_VERSION "\n");
	printf ("Copyright (C) 2003-2007 XMMS2 Team\n");
	printf ("This is free software; see the source for copying conditions.\n");
	printf ("There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n");
	printf ("PARTICULAR PURPOSE.\n");
	printf (" Using glib version %d.%d.%d (compiled against "
	        G_STRINGIFY (GLIB_MAJOR_VERSION) "."
	        G_STRINGIFY (GLIB_MINOR_VERSION) "."
	        G_STRINGIFY (GLIB_MICRO_VERSION) ")\n",
	        glib_major_version,
	        glib_minor_version,
	        glib_micro_version);
	xmms_sqlite_print_version ();

	exit (EXIT_SUCCESS);
}

/**
 * The xmms2 daemon main initialisation function
 */
int
main (int argc, char **argv)
{
	xmms_output_plugin_t *o_plugin;
	xmms_config_property_t *cv;
	xmms_main_t *mainobj;
	int loglevel = 1;
	xmms_playlist_t *playlist;
	gchar default_path[XMMS_PATH_MAX + 16], *tmp;

	const gchar *vererr;

	gboolean verbose = FALSE;
	gboolean quiet = FALSE;
	gboolean version = FALSE;
	gboolean nologging = FALSE;
	gboolean runasroot = FALSE;
	const gchar *outname = NULL;
	const gchar *ipcpath = NULL;
	gchar *ppath = NULL;
	int status_fd = -1;
	GOptionContext *context = NULL;
	GError *error = NULL;

	/**
	 * The options that the server accepts.
	 */
	GOptionEntry opts[] = {
		{"verbose", 'v', 0, G_OPTION_ARG_NONE, &verbose, "Increase verbosity", NULL},
		{"quiet", 'q', 0, G_OPTION_ARG_NONE, &quiet, "Decrease verbosity", NULL},
		{"version", 'V', 0, G_OPTION_ARG_NONE, &version, "Print version", NULL},
		{"no-logging", 'n', 0, G_OPTION_ARG_NONE, &nologging, "Disable logging", NULL},
		{"output", 'o', 0, G_OPTION_ARG_STRING, &outname, "Use 'x' as output plugin", "<x>"},
		{"ipc-socket", 'i', 0, G_OPTION_ARG_FILENAME, &ipcpath, "Listen to socket 'url'", "<url>"},
		{"plugindir", 'p', 0, G_OPTION_ARG_FILENAME, &ppath, "Search for plugins in directory 'foo'", "<foo>"},
		{"conf", 'c', 0, G_OPTION_ARG_FILENAME, &conffile, "Specify alternate configuration file", "<file>"},
		{"status-fd", 's', 0, G_OPTION_ARG_INT, &status_fd, "Specify a filedescriptor to write to when started", "fd"},
		{"yes-run-as-root", 0, 0, G_OPTION_ARG_NONE, &runasroot, "Give me enough rope to shoot myself in the foot", NULL},
		{NULL}
	};

	/** Check that we are running against the correct glib version */
	vererr = glib_check_version (GLIB_MAJOR_VERSION, GLIB_MINOR_VERSION, 0);
	if (vererr) {
		g_print ("Bad glib version: %s\n", vererr);
		exit (EXIT_FAILURE);
	}

	xmms_signal_block ();

	context = g_option_context_new ("- XMMS2 Daemon");
	g_option_context_add_main_entries (context, opts, NULL);
	if (!g_option_context_parse (context, &argc, &argv, &error) || error) {
		g_print ("Error parsing options: %s\n", error->message);
		g_clear_error (&error);
		exit (EXIT_FAILURE);
	}
	g_option_context_free (context);

	if (argc != 1) {
		g_print ("There was unknown options, aborting!\n");
		exit (EXIT_FAILURE);
	}

	if (getuid () == 0 || geteuid () == 0) {
		if (runasroot) {
			g_print ("***************************************\n");
			g_print ("Warning! You are running XMMS2D as root, this is a bad idea!\nBut I'll allow it since you asked nicely.\n");
			g_print ("***************************************\n\n");
		} else {
			g_print ("PLEASE DON'T RUN XMMS2D AS ROOT!\n\n(if you really must, read the help)\n");
			exit (EXIT_FAILURE);
		}
	}

	if (verbose) {
		loglevel++;
	} else if (quiet) {
		loglevel--;
	}

	if (version) {
		print_version ();
	}

	g_thread_init (NULL);

	g_random_set_seed (time (NULL));

	xmms_log_init (loglevel);
	xmms_ipc_init ();

	load_config ();

	xmms_default_ipcpath_get (default_path, sizeof (default_path));

	cv = xmms_config_property_register ("core.ipcsocket",
	                                    default_path,
	                                    on_config_ipcsocket_change,
	                                    NULL);

	if (!ipcpath) {
		/*
		 * if not ipcpath is specifed on the cmd line we
		 * grab it from the config
		 */
		ipcpath = xmms_config_property_get_string (cv);
	}

	if (!xmms_ipc_setup_server (ipcpath)) {
		xmms_ipc_shutdown ();
		xmms_log_fatal ("IPC failed to init!");
	}

	if (!xmms_plugin_init (ppath)) {
		return 1;
	}

	playlist = xmms_playlist_init ();
	xform_obj = xmms_xform_object_init ();
	bindata_obj = xmms_bindata_init ();

	mainobj = xmms_object_new (xmms_main_t, xmms_main_destroy);

	/* find output plugin. */
	cv = xmms_config_property_register ("output.plugin",
	                                    XMMS_OUTPUT_DEFAULT,
	                                    change_output, mainobj);

	if (outname) {
		xmms_config_setvalue (NULL, "output.plugin", outname, NULL);
	}

	outname = xmms_config_property_get_string (cv);
	xmms_log_info ("Using output plugin: %s", outname);
	o_plugin = (xmms_output_plugin_t *)xmms_plugin_find (XMMS_PLUGIN_TYPE_OUTPUT, outname);
	if (!o_plugin) {
		xmms_log_error ("Baaaaad output plugin, try to change the"
		                "output.plugin config variable to something usefull");
	}

	mainobj->output = xmms_output_new (o_plugin, playlist);
	if (!mainobj->output) {
		xmms_log_fatal ("Failed to create output object!");
	}

	if (status_fd != -1) {
		write (status_fd, "+", 1);
	}

	xmms_signal_init (XMMS_OBJECT (mainobj));

	xmms_ipc_object_register (XMMS_IPC_OBJECT_MAIN,
	                          XMMS_OBJECT (mainobj));

	xmms_ipc_broadcast_register (XMMS_OBJECT (mainobj),
	                             XMMS_IPC_SIGNAL_QUIT);

	xmms_object_cmd_add (XMMS_OBJECT (mainobj),
	                     XMMS_IPC_CMD_QUIT,
	                     XMMS_CMD_FUNC (quit));
	xmms_object_cmd_add (XMMS_OBJECT (mainobj),
	                     XMMS_IPC_CMD_HELLO,
	                     XMMS_CMD_FUNC (hello));
	xmms_object_cmd_add (XMMS_OBJECT (mainobj),
	                     XMMS_IPC_CMD_PLUGIN_LIST,
	                     XMMS_CMD_FUNC (plugin_list));
	xmms_object_cmd_add (XMMS_OBJECT (mainobj),
	                     XMMS_IPC_CMD_STATS,
	                     XMMS_CMD_FUNC (stats));

	/* Save the time we started in order to count uptime */
	mainobj->starttime = time (NULL);

	/* Dirty hack to tell XMMS_PATH a valid path */
	g_strlcpy (default_path, ipcpath, sizeof (default_path));

	tmp = strchr (default_path, ';');
	if (tmp) {
		*tmp = '\0';
	}

	putenv (g_strdup_printf ("XMMS_PATH=%s", default_path));

	/* Also put the full path for clients that understands */
	putenv (g_strdup_printf ("XMMS_PATH_FULL=%s", ipcpath));

	tmp = XMMS_BUILD_PATH ("shutdown.d");
	cv = xmms_config_property_register ("core.shutdownpath",
	                                    tmp, NULL, NULL);
	g_free (tmp);

	tmp = XMMS_BUILD_PATH ("startup.d");
	cv = xmms_config_property_register ("core.startuppath",
	                                    tmp, NULL, NULL);
	g_free (tmp);

	/* Startup dir */
	do_scriptdir (xmms_config_property_get_string (cv));

	mainloop = g_main_loop_new (NULL, FALSE);

	g_main_loop_run (mainloop);

	return 0;
}

/** @} */