/* RetroArch - A frontend for libretro.
 * Copyright (C) 2010-2014 - Hans-Kristian Arntzen
 * Copyright (C) 2011-2016 - Daniel De Matteis
 * Copyright (C) 2012-2015 - Michael Lelli
 *
 * RetroArch is free software: you can redistribute it and/or modify it under the terms
 * of the GNU General Public License as published by the Free Software Found-
 * ation, either version 3 of the License, or (at your option) any later version.
 *
 * RetroArch 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with RetroArch.
 * If not, see <http://www.gnu.org/licenses/>.
 */

#include <file/file_path.h>
#include <retro_assert.h>
#include <retro_stat.h>

#ifdef HAVE_THREADS
#include <rthreads/async_job.h>
#endif

#include "frontend.h"
#include "../ui/ui_companion_driver.h"

#include "../defaults.h"
#include "../content.h"
#include "../driver.h"
#include "../system.h"
#include "../driver.h"
#include "../retroarch.h"
#include "../runloop.h"
#include "../verbosity.h"

#ifdef HAVE_MENU
#include "../menu/menu_driver.h"
#endif

#define MAX_ARGS 32

#ifdef HAVE_THREADS
static async_job_t *async_jobs;

int rarch_main_async_job_add(async_task_t task, void *payload)
{
   return async_job_add(async_jobs, task, payload);
}
#endif

/**
 * main_exit:
 *
 * Cleanly exit RetroArch.
 *
 * Also saves configuration files to disk,
 * and (optionally) autosave state.
 **/
void main_exit(void *args)
{
   settings_t *settings                  = config_get_ptr();

   event_cmd_ctl(EVENT_CMD_MENU_SAVE_CURRENT_CONFIG, NULL);

   if (content_ctl(CONTENT_CTL_IS_INITED, NULL))
   {
#ifdef HAVE_MENU
      /* Do not want menu context to live any more. */
      menu_driver_ctl(RARCH_MENU_CTL_UNSET_OWN_DRIVER, NULL);
#endif
      rarch_main_deinit();
   }

   event_cmd_ctl(EVENT_CMD_PERFCNT_REPORT_FRONTEND_LOG, NULL);

#if defined(HAVE_LOGGER) && !defined(ANDROID)
   logger_shutdown();
#endif

   frontend_driver_deinit(args);
   frontend_driver_exitspawn(settings->libretro,
         sizeof(settings->libretro));

   rarch_ctl(RARCH_CTL_DESTROY, NULL);

   ui_companion_driver_deinit();

   frontend_driver_shutdown(false);

   driver_ctl(RARCH_DRIVER_CTL_DEINIT, NULL);
   ui_companion_driver_free();
   frontend_driver_free();
}

static void check_defaults_dirs(void)
{
   if (*g_defaults.dir.core_assets)
      path_mkdir(g_defaults.dir.core_assets);
   if (*g_defaults.dir.remap)
      path_mkdir(g_defaults.dir.remap);
   if (*g_defaults.dir.screenshot)
      path_mkdir(g_defaults.dir.screenshot);
   if (*g_defaults.dir.core)
      path_mkdir(g_defaults.dir.core);
   if (*g_defaults.dir.autoconfig)
      path_mkdir(g_defaults.dir.autoconfig);
   if (*g_defaults.dir.audio_filter)
      path_mkdir(g_defaults.dir.audio_filter);
   if (*g_defaults.dir.video_filter)
      path_mkdir(g_defaults.dir.video_filter);
   if (*g_defaults.dir.assets)
      path_mkdir(g_defaults.dir.assets);
   if (*g_defaults.dir.playlist)
      path_mkdir(g_defaults.dir.playlist);
   if (*g_defaults.dir.core)
      path_mkdir(g_defaults.dir.core);
   if (*g_defaults.dir.core_info)
      path_mkdir(g_defaults.dir.core_info);
   if (*g_defaults.dir.overlay)
      path_mkdir(g_defaults.dir.overlay);
   if (*g_defaults.dir.port)
      path_mkdir(g_defaults.dir.port);
   if (*g_defaults.dir.shader)
      path_mkdir(g_defaults.dir.shader);
   if (*g_defaults.dir.savestate)
      path_mkdir(g_defaults.dir.savestate);
   if (*g_defaults.dir.sram)
      path_mkdir(g_defaults.dir.sram);
   if (*g_defaults.dir.system)
      path_mkdir(g_defaults.dir.system);
   if (*g_defaults.dir.resampler)
      path_mkdir(g_defaults.dir.resampler);
   if (*g_defaults.dir.menu_config)
      path_mkdir(g_defaults.dir.menu_config);
   if (*g_defaults.dir.content_history)
      path_mkdir(g_defaults.dir.content_history);
   if (*g_defaults.dir.cache)
      path_mkdir(g_defaults.dir.cache);
   if (*g_defaults.dir.database)
      path_mkdir(g_defaults.dir.database);
   if (*g_defaults.dir.cursor)
      path_mkdir(g_defaults.dir.cursor);
   if (*g_defaults.dir.cheats)
      path_mkdir(g_defaults.dir.cheats);
}

static void history_playlist_push(content_playlist_t *playlist,
      const char *path, const char *core_path,
      struct retro_system_info *info)
{
   char tmp[PATH_MAX_LENGTH];
   rarch_system_info_t *system           = NULL;
   
   runloop_ctl(RUNLOOP_CTL_SYSTEM_INFO_GET, &system);

   if (!playlist || rarch_ctl(RARCH_CTL_IS_DUMMY_CORE, NULL) || !info)
      return;

   /* Path can be relative here.
    * Ensure we're pushing absolute path. */

   strlcpy(tmp, path, sizeof(tmp));

   if (*tmp)
      path_resolve_realpath(tmp, sizeof(tmp));

   if (system->no_content || *tmp)
      content_playlist_push(playlist,
            *tmp ? tmp : NULL,
            NULL,
            core_path,
            info->library_name,
            NULL,
            NULL);
}

/**
 * main_load_content:
 * @argc             : Argument count.
 * @argv             : Argument variable list.
 * @args             : Arguments passed from callee.
 * @environ_get      : Function passed for environment_get function.
 *
 * Loads content file and starts up RetroArch.
 * If no content file can be loaded, will start up RetroArch
 * as-is.
 *
 * Returns: false (0) if rarch_main_init failed, otherwise true (1).
 **/
bool main_load_content(int argc, char **argv, void *args,
      environment_get_t environ_get)
{
   unsigned i;
   bool retval                       = true;
   int ret = 0, rarch_argc           = 0;
   char *rarch_argv[MAX_ARGS]        = {NULL};
   char *argv_copy [MAX_ARGS]        = {NULL};
   char **rarch_argv_ptr             = (char**)argv;
   int *rarch_argc_ptr               = (int*)&argc;
   struct rarch_main_wrap *wrap_args = (struct rarch_main_wrap*)
      calloc(1, sizeof(*wrap_args));

   if (!wrap_args)
      return false;

   (void)rarch_argc_ptr;
   (void)rarch_argv_ptr;
   (void)ret;

   retro_assert(wrap_args);

   if (environ_get)
      environ_get(rarch_argc_ptr, rarch_argv_ptr, args, wrap_args);

   if (wrap_args->touched)
   {
      rarch_main_init_wrap(wrap_args, &rarch_argc, rarch_argv);
      memcpy(argv_copy, rarch_argv, sizeof(rarch_argv));
      rarch_argv_ptr = (char**)rarch_argv;
      rarch_argc_ptr = (int*)&rarch_argc;
   }

   if (rarch_ctl(RARCH_CTL_IS_INITED, NULL))
      rarch_main_deinit();

   if ((ret = rarch_main_init(*rarch_argc_ptr, rarch_argv_ptr)))
   {
      retval = false;
      goto error;
   }

   event_cmd_ctl(EVENT_CMD_RESUME, NULL);

   check_defaults_dirs();

   frontend_driver_process_args(rarch_argc_ptr, rarch_argv_ptr);

error:
   for (i = 0; i < ARRAY_SIZE(argv_copy); i++)
      free(argv_copy[i]);
   free(wrap_args);
   return retval;
}

/**
 * main_entry:
 *
 * Main function of RetroArch.
 *
 * If HAVE_MAIN is not defined, will contain main loop and will not
 * be exited from until we exit the program. Otherwise, will
 * just do initialization.
 *
 * Returns: varies per platform.
 **/
int rarch_main(int argc, char *argv[], void *data)
{
   void *args                      = (void*)data;
   int ret                         = 0;
   settings_t *settings            = NULL;

   rarch_ctl(RARCH_CTL_PREINIT, NULL);

   frontend_driver_init_first(args);
   rarch_ctl(RARCH_CTL_INIT, NULL);

#ifdef HAVE_THREADS
   async_jobs = async_job_new();
#endif
   
   if (frontend_driver_is_inited())
   {
      ret = main_load_content(argc, argv, args,
            frontend_driver_environment_get_ptr());

      if (!ret)
         return ret;
   }

   event_cmd_ctl(EVENT_CMD_HISTORY_INIT, NULL);

   settings = config_get_ptr();

   if (settings->history_list_enable)
   {
      char *fullpath              = NULL;
      rarch_system_info_t *system = NULL;
      
      runloop_ctl(RUNLOOP_CTL_SYSTEM_INFO_GET,  &system);
      runloop_ctl(RUNLOOP_CTL_GET_CONTENT_PATH, &fullpath);

      if (content_ctl(CONTENT_CTL_IS_INITED, NULL) || system->no_content)
         history_playlist_push(
               g_defaults.history,
               fullpath,
               settings->libretro,
               system ? &system->info : NULL);
   }

   ui_companion_driver_init_first();

#ifndef HAVE_MAIN
   do
   {
      unsigned sleep_ms = 0;
      ret = runloop_iterate(&sleep_ms);

      if (ret == 1 && sleep_ms > 0)
         retro_sleep(sleep_ms);
      runloop_ctl(RUNLOOP_CTL_DATA_ITERATE, NULL);
   }while(ret != -1);

   main_exit(args);
#endif

#ifdef HAVE_THREADS
   async_job_free(async_jobs);
   async_jobs = NULL;
#endif

   return 0;
}

#ifndef HAVE_MAIN
int main(int argc, char *argv[])
{
   return rarch_main(argc, argv, NULL);
}
#endif