#include <glib.h>
#include <gio/gio.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "wmud_types.h"
#include "main.h"
#include "networking.h"
#include "interpreter.h"
#include "db.h"

struct {
	char *file;
	int line;
} debug_context_loc = {NULL, 0};

GMainContext *game_context;
guint32 elapsed_seconds = 0;
guint32 elapsed_cycle = 0;
GRand *main_rand = NULL;
GQuark WMUD_CONFIG_ERROR = 0;
GQuark WMUD_DB_ERROR = 0;
guint port = 0;
gchar *database_file = NULL;
gchar *admin_email = NULL;

/* rl_sec_elapsed()
 *
 * This function keeps track of elapsed real-world time. It is inaccurate by
 * design, but it doesn't actually matter.
 */
gboolean
rl_sec_elapsed(gpointer user_data)
{
	elapsed_seconds++;
	if (elapsed_seconds == G_MAXUINT32)
	{
		elapsed_seconds = 0;
		elapsed_cycle++;
	}

	if (elapsed_seconds % 30 == 0)
	{
		g_log(G_LOG_DOMAIN, G_LOG_LEVEL_MESSAGE, "Heartbeat");
	}

	return TRUE;
}

#ifdef DEBUG
void
/* debug_context()
 *
 * This function keeps track of the code flow in some way. It can help with
 * debugging, as during a SIGSEGV or such signal this will print out the last
 * place of DebugContext in the code.
 */
debug_context(char *file, int line)
{
	if (debug_context_loc.file != NULL)
		g_free(debug_context_loc.file);

	debug_context_loc.file = g_strdup(file);
	debug_context_loc.line = line;
}
#define DebugContext debug_context(__FILE__, __LINE__)
#else
#define DebugContext
#endif

void
wmud_type_init(void)
{
	WMUD_CONFIG_ERROR = g_quark_from_string("wmud_config_error");
	WMUD_DB_ERROR = g_quark_from_string("wmud_db_error");
}

gboolean
wmud_config_init(GError **err)
{
	GString *config_file = g_string_new(WMUD_CONFDIR);
	GKeyFile *config;
	GError *in_err = NULL;

	g_string_append(config_file, "/wmud.conf");

	config = g_key_file_new();
	/* TODO: Error checking */
	g_key_file_load_from_file(config, config_file->str, 0, &in_err);

	if (!g_key_file_has_group(config, "global"))
	{
		g_set_error(err, WMUD_CONFIG_ERROR, WMUD_CONFIG_ERROR_NOGLOBAL, "Config file (%s) does not contain a [global] group", config_file->str);
		g_key_file_free(config);
		g_string_free(config_file, TRUE);

		return FALSE;
	}

	g_clear_error(&in_err);
	port = g_key_file_get_integer(config, "global", "port", &in_err);
	if (in_err)
	{
		if (g_error_matches(in_err, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
		{
			port = DEFAULT_PORT;
		}
		else if (g_error_matches(in_err, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_INVALID_VALUE))
		{
			g_set_error(err, WMUD_CONFIG_ERROR, WMUD_CONFIG_ERROR_BADPORT, "Config file (%s) contains an invalid port number", config_file->str);
			g_key_file_free(config);
			g_string_free(config_file, TRUE);
			port = 0;

			return FALSE;
		}

		return FALSE;
	}

	g_clear_error(&in_err);
	database_file = g_key_file_get_string(config, "global", "world file", &in_err);
	if (in_err)
	{
		if (g_error_matches(in_err, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
		{
			g_set_error(err, WMUD_CONFIG_ERROR, WMUD_CONFIG_ERROR_NOWORLD, "Config file (%s) does not contain a world file path", config_file->str);
			g_key_file_free(config);
			g_string_free(config_file, TRUE);
			database_file = NULL;

			return FALSE;
		}
	}

	g_clear_error(&in_err);
	admin_email = g_key_file_get_string(config, "global", "admin email", &in_err);
	if (in_err)
	{
		if (g_error_matches(in_err, G_KEY_FILE_ERROR, G_KEY_FILE_ERROR_KEY_NOT_FOUND))
		{
			g_set_error(err, WMUD_CONFIG_ERROR, WMUD_CONFIG_ERROR_NOEMAIL, "Config file (%s) does not contain an admin e-mail address", config_file->str);
			g_key_file_free(config);
			g_string_free(config_file, TRUE);
			admin_email = NULL;

			return FALSE;
		}
	}

	g_key_file_free(config);
	g_string_free(config_file, TRUE);

	return TRUE;
}

gpointer
game_thread_func(GMainLoop *game_loop)
{
	/* Run the game loop */
	g_main_loop_run(game_loop);

	return NULL;
}

int
main(int argc, char **argv)
{
	GMainLoop *game_loop;
	GSource *timeout_source;
	guint timeout_id;
	GError *err = NULL;
	GThread *game_thread;

	/* Initialize the thread and type system */
	g_thread_init(NULL);
	g_type_init();
	wmud_type_init();

	/* TODO: Command line parsing */

	/* Initialize random number generator */
	main_rand = g_rand_new();

	/* Create the game context and main loop */
	game_context = g_main_context_new();
	game_loop = g_main_loop_new(game_context, FALSE);

	/* Create the timeout source which keeps track of elapsed real-world
	 * time */
	timeout_source = g_timeout_source_new(1000);
	g_source_set_callback(timeout_source, rl_sec_elapsed, NULL, NULL);
	timeout_id = g_source_attach(timeout_source, game_context);
	g_source_unref(timeout_source);

	/* TODO: Create signal handlers! */

	if (!wmud_config_init(&err))
	{
		if (err)
		{
			g_critical("Config file parsing error: %s", err->message);
		}
		else
		{
			g_critical("Config file parsing error!");
		}

		return 1;
	}

	g_assert(port != 0);
	g_assert(database_file != NULL);

	g_clear_error(&err);
	if (!wmud_db_init(&err))
	{
		if (err)
		{
			g_critical("Database initialization error: %s", err->message);
		}
		else
		{
			g_critical("Database initialization error!");
		}

		return 1;
	}
	g_clear_error(&err);
	if (!wmud_networking_init(port, &err))
	{
		if (err)
		{
			g_critical("Database initialization error: %s", err->message);
		}
		else
		{
			g_critical("Database initialization error!");
		}

		return 1;
	}

	g_clear_error(&err);
	wmud_db_players_load(&err);

	/* Initialization ends here */

	g_clear_error(&err);
	game_thread = g_thread_create((GThreadFunc)game_thread_func, game_loop, TRUE, &err);

	/* Initialize other threads here */

	g_thread_join(game_thread);

	return 0;
}