#include "e.h"

/* local subsystem functions */
static void _e_bg_signal(void *data, Evas_Object *obj, const char *emission, const char *source);
static void _e_bg_event_bg_update_free(void *data, void *event);

static void _e_bg_image_import_dialog_done(void *data, const char *path, Eina_Bool ok, Eina_Bool external, int quality, E_Image_Import_Mode mode);
static void _e_bg_image_import_done(void *data, Eina_Bool ok, const char *image_path, const char *edje_path);
static void _e_bg_handler_image_imported(void *data, const char *image_path);

/* local subsystem globals */
EAPI int E_EVENT_BG_UPDATE = 0;
static E_Fm2_Mime_Handler *bg_hdl = NULL;

struct _E_Bg_Image_Import_Handle
{
   struct
   {
      void  (*func)(void *data, const char *edje_file);
      void *data;
   } cb;
   E_Dialog                   *dia;
   E_Util_Image_Import_Handle *importer;
   Eina_Bool                   canceled : 1;
};

/* externally accessible functions */
EINTERN int
e_bg_init(void)
{
   Eina_List *l = NULL;
   E_Config_Desktop_Background *cfbg = NULL;

   /* Register mime handler */
   bg_hdl = e_fm2_mime_handler_new(_("Set As Background"),
                                   "preferences-desktop-wallpaper",
                                   e_bg_handler_set, NULL,
                                   e_bg_handler_test, NULL);
   if (bg_hdl)
     {
        e_fm2_mime_handler_glob_add(bg_hdl, "*.edj");
        e_fm2_mime_handler_mime_add(bg_hdl, "image/png");
        e_fm2_mime_handler_mime_add(bg_hdl, "image/jpeg");
     }

   /* Register files in use */
   if (e_config->desktop_default_background)
     e_filereg_register(e_config->desktop_default_background);

   EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cfbg)
     {
        if (!cfbg) continue;
        e_filereg_register(cfbg->file);
     }

   E_EVENT_BG_UPDATE = ecore_event_type_new();
   return 1;
}

EINTERN int
e_bg_shutdown(void)
{
   Eina_List *l = NULL;
   E_Config_Desktop_Background *cfbg = NULL;

   /* Deregister mime handler */
   if (bg_hdl)
     {
        e_fm2_mime_handler_glob_del(bg_hdl, "*.edj");
        e_fm2_mime_handler_free(bg_hdl);
     }

   /* Deregister files in use */
   if (e_config->desktop_default_background)
     e_filereg_deregister(e_config->desktop_default_background);

   EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cfbg)
     {
        if (!cfbg) continue;
        e_filereg_deregister(cfbg->file);
     }

   return 1;
}

/**
 * Find the configuration for a given desktop background
 * Use -1 as a wild card for each parameter.
 * The most specific match will be returned
 */
EAPI const E_Config_Desktop_Background *
e_bg_config_get(int container_num, int zone_num, int desk_x, int desk_y)
{
   Eina_List *l, *ll, *entries;
   E_Config_Desktop_Background *bg = NULL, *cfbg = NULL;
   const char *bgfile = "";
   char *entry;
   int current_spec = 0; /* how specific the setting is - we want the least general one that applies */

   /* look for desk specific background. */
   if (container_num >= 0 || zone_num >= 0 || desk_x >= 0 || desk_y >= 0)
     {
        EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cfbg)
          {
             int spec;

             if (!cfbg) continue;
             spec = 0;
             if (cfbg->container == container_num) spec++;
             else if (cfbg->container >= 0)
               continue;
             if (cfbg->zone == zone_num) spec++;
             else if (cfbg->zone >= 0)
               continue;
             if (cfbg->desk_x == desk_x) spec++;
             else if (cfbg->desk_x >= 0)
               continue;
             if (cfbg->desk_y == desk_y) spec++;
             else if (cfbg->desk_y >= 0)
               continue;

             if (spec <= current_spec) continue;
             bgfile = cfbg->file;
             if (bgfile)
               {
                  if (bgfile[0] != '/')
                    {
                       const char *bf;

                       bf = e_path_find(path_backgrounds, bgfile);
                       if (bf) bgfile = bf;
                    }
               }
             if (eina_str_has_extension(bgfile, ".edj"))
               {
                  entries = edje_file_collection_list(bgfile);
                  if (entries)
                    {
                       EINA_LIST_FOREACH(entries, ll, entry)
                         {
                            if (!strcmp(entry, "e/desktop/background"))
                              {
                                 bg = cfbg;
                                 current_spec = spec;
                              }
                         }
                       edje_file_collection_list_free(entries);
                    }
               }
             else
               {
                  bg = cfbg;
                  current_spec = spec;
               }
          }
     }
   return bg;
}

EAPI const char *
e_bg_file_get(int container_num, int zone_num, int desk_x, int desk_y)
{
   const E_Config_Desktop_Background *cfbg;
   Eina_List *l, *entries;
   const char *bgfile = "";
   char *entry;
   int ok = 0;

   cfbg = e_bg_config_get(container_num, zone_num, desk_x, desk_y);

   /* fall back to default */
   if (cfbg)
     {
        bgfile = cfbg->file;
        if (bgfile)
          {
             if (bgfile[0] != '/')
               {
                  const char *bf;

                  bf = e_path_find(path_backgrounds, bgfile);
                  if (bf) bgfile = bf;
               }
          }
     }
   else
     {
        bgfile = e_config->desktop_default_background;
        if (bgfile)
          {
             if (bgfile[0] != '/')
               {
                  const char *bf;

                  bf = e_path_find(path_backgrounds, bgfile);
                  if (bf) bgfile = bf;
               }
          }
        if (bgfile && eina_str_has_extension(bgfile, ".edj"))
          {
             entries = edje_file_collection_list(bgfile);
             if (entries)
               {
                  EINA_LIST_FOREACH(entries, l, entry)
                    {
                       if (!strcmp(entry, "e/desktop/background"))
                         {
                            ok = 1;
                            break;
                         }
                    }
                  edje_file_collection_list_free(entries);
               }
          }
        else if ((bgfile) && (bgfile[0]))
          ok = 1;
        if (!ok)
          bgfile = e_theme_edje_file_get("base/theme/background",
                                         "e/desktop/background");
     }

   return bgfile;
}

EAPI void
e_bg_zone_update(E_Zone *zone, E_Bg_Transition transition)
{
   Evas_Object *o;
   const char *bgfile = "";
   const char *trans = "";
   E_Desk *desk;

   if (transition == E_BG_TRANSITION_START) trans = e_config->transition_start;
   else if (transition == E_BG_TRANSITION_DESK)
     trans = e_config->transition_desk;
   else if (transition == E_BG_TRANSITION_CHANGE)
     trans = e_config->transition_change;
   if ((!trans) || (!trans[0])) transition = E_BG_TRANSITION_NONE;

   desk = e_desk_current_get(zone);
   if (desk)
     bgfile = e_bg_file_get(zone->container->num, zone->num, desk->x, desk->y);
   else
     bgfile = e_bg_file_get(zone->container->num, zone->num, -1, -1);

   if (zone->bg_object)
     {
        const char *pfile = "";

        edje_object_file_get(zone->bg_object, &pfile, NULL);
        if (!e_util_strcmp(pfile, bgfile)) return;
     }

   if (transition == E_BG_TRANSITION_NONE)
     {
        if (zone->bg_object)
          {
             evas_object_del(zone->bg_object);
             zone->bg_object = NULL;
          }
     }
   else
     {
        char buf[4096];

        if (zone->bg_object)
          {
             if (zone->prev_bg_object)
               evas_object_del(zone->prev_bg_object);
             zone->prev_bg_object = zone->bg_object;
             if (zone->transition_object)
               evas_object_del(zone->transition_object);
             zone->transition_object = NULL;
             zone->bg_object = NULL;
          }
        o = edje_object_add(zone->container->bg_evas);
        zone->transition_object = o;
        /* FIXME: segv if zone is deleted while up??? */
        evas_object_data_set(o, "e_zone", zone);
        snprintf(buf, sizeof(buf), "e/transitions/%s", trans);
        e_theme_edje_object_set(o, "base/theme/transitions", buf);
        edje_object_signal_callback_add(o, "e,state,done", "*", _e_bg_signal, zone);
        evas_object_move(o, zone->x, zone->y);
        evas_object_resize(o, zone->w, zone->h);
        evas_object_layer_set(o, -1);
        evas_object_clip_set(o, zone->bg_clip_object);
        evas_object_show(o);
     }
   if (eina_str_has_extension(bgfile, ".edj"))
     {
        o = edje_object_add(zone->container->bg_evas);
        evas_object_data_set(o, "e_zone", zone);
        edje_object_file_set(o, bgfile, "e/desktop/background");
     }
   else
     {
        o = e_icon_add(zone->container->bg_evas);
        evas_object_data_set(o, "e_zone", zone);
        e_icon_file_key_set(o, bgfile, NULL);
        e_icon_fill_inside_set(o, 0);
     }
   zone->bg_object = o;
   if (transition == E_BG_TRANSITION_NONE)
     {
        evas_object_move(o, zone->x, zone->y);
        evas_object_resize(o, zone->w, zone->h);
        evas_object_layer_set(o, -1);
     }
   evas_object_clip_set(o, zone->bg_clip_object);
   evas_object_show(o);

   if (transition != E_BG_TRANSITION_NONE)
     {
        edje_extern_object_max_size_set(zone->prev_bg_object, 65536, 65536);
        edje_extern_object_min_size_set(zone->prev_bg_object, 0, 0);
        edje_object_part_swallow(zone->transition_object, "e.swallow.bg.old",
                                 zone->prev_bg_object);
        edje_extern_object_max_size_set(zone->bg_object, 65536, 65536);
        edje_extern_object_min_size_set(zone->bg_object, 0, 0);
        edje_object_part_swallow(zone->transition_object, "e.swallow.bg.new",
                                 zone->bg_object);
        edje_object_signal_emit(zone->transition_object, "e,action,start", "e");
     }
}

EAPI void
e_bg_default_set(const char *file)
{
   E_Event_Bg_Update *ev;
   Eina_Bool changed;

   file = eina_stringshare_add(file);
   changed = file != e_config->desktop_default_background;

   if (!changed)
     {
        eina_stringshare_del(file);
        return;
     }

   if (e_config->desktop_default_background)
     {
        e_filereg_deregister(e_config->desktop_default_background);
        eina_stringshare_del(e_config->desktop_default_background);
     }

   if (file)
     {
        e_filereg_register(file);
        e_config->desktop_default_background = file;
     }
   else
     e_config->desktop_default_background = NULL;

   ev = E_NEW(E_Event_Bg_Update, 1);
   ev->container = -1;
   ev->zone = -1;
   ev->desk_x = -1;
   ev->desk_y = -1;
   ecore_event_add(E_EVENT_BG_UPDATE, ev, _e_bg_event_bg_update_free, NULL);
}

EAPI void
e_bg_add(int container, int zone, int desk_x, int desk_y, const char *file)
{
   const Eina_List *l;
   E_Config_Desktop_Background *cfbg;
   E_Event_Bg_Update *ev;

   file = eina_stringshare_add(file);

   EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cfbg)
     {
        if ((cfbg) &&
            (cfbg->container == container) &&
            (cfbg->zone == zone) &&
            (cfbg->desk_x == desk_x) &&
            (cfbg->desk_y == desk_y) &&
            (cfbg->file == file))
          {
             eina_stringshare_del(file);
             return;
          }
     }

   e_bg_del(container, zone, desk_x, desk_y);
   cfbg = E_NEW(E_Config_Desktop_Background, 1);
   cfbg->container = container;
   cfbg->zone = zone;
   cfbg->desk_x = desk_x;
   cfbg->desk_y = desk_y;
   cfbg->file = file;
   e_config->desktop_backgrounds = eina_list_append(e_config->desktop_backgrounds, cfbg);

   e_filereg_register(cfbg->file);

   ev = E_NEW(E_Event_Bg_Update, 1);
   ev->container = container;
   ev->zone = zone;
   ev->desk_x = desk_x;
   ev->desk_y = desk_y;
   ecore_event_add(E_EVENT_BG_UPDATE, ev, _e_bg_event_bg_update_free, NULL);
}

EAPI void
e_bg_del(int container, int zone, int desk_x, int desk_y)
{
   Eina_List *l;
   E_Config_Desktop_Background *cfbg;
   E_Event_Bg_Update *ev;

   EINA_LIST_FOREACH(e_config->desktop_backgrounds, l, cfbg)
     {
        if (!cfbg) continue;
        if ((cfbg->container == container) && (cfbg->zone == zone) &&
            (cfbg->desk_x == desk_x) && (cfbg->desk_y == desk_y))
          {
             e_config->desktop_backgrounds = eina_list_remove_list(e_config->desktop_backgrounds, l);
             e_filereg_deregister(cfbg->file);
             if (cfbg->file) eina_stringshare_del(cfbg->file);
             free(cfbg);
             break;
          }
     }

   ev = E_NEW(E_Event_Bg_Update, 1);
   ev->container = container;
   ev->zone = zone;
   ev->desk_x = desk_x;
   ev->desk_y = desk_y;
   ecore_event_add(E_EVENT_BG_UPDATE, ev, _e_bg_event_bg_update_free, NULL);
}

EAPI void
e_bg_update(void)
{
   Eina_List *l, *ll, *lll;
   E_Manager *man;
   E_Container *con;
   E_Zone *zone;

   EINA_LIST_FOREACH(e_manager_list(), l, man)
     {
        EINA_LIST_FOREACH(man->containers, ll, con)
          {
             EINA_LIST_FOREACH(con->zones, lll, zone)
               {
                  e_zone_bg_reconfigure(zone);
               }
          }
     }
}

static inline Eina_Bool
_e_bg_file_edje_check(const char *path)
{
   const char *ext;
   const size_t extlen = sizeof(".edj") - 1;
   size_t len;

   if (!path) return EINA_FALSE;

   len = strlen(path);
   if (len <= extlen) return EINA_FALSE;
   ext = path + len - extlen;
   return memcmp(ext, ".edj", extlen) == 0;
}

/**
 * Go through process of importing an image as E background.
 *
 * This will go through process of importing an image as E
 * background. It will ask fill/tile mode of the image, as well as
 * quality to use.
 *
 * User can cancel operation at any time, and in this case callback is
 * called with @c NULL as second parameter.
 *
 * The operation can be canceled by application/module as well using
 * e_bg_image_import_cancel(). Even in this case the callback is called so user
 * can free possibly allocated data.
 *
 * @param image_file source file to use, must be supported by Evas.
 * @param cb callback to call when import process is done. The first
 *        argument is the given data, while the second is the path to
 *        the imported background file (edje) that can be used with
 *        e_bg_add() or e_bg_default_set(). Note that if @a edje_file
 *        is @c NULL, then the import process was canceled!
 *        This function is @b always called and after it returns
 *        E_Bg_Image_Import_Handle is deleted.
 * @param data pointer to data to be given to callback.
 *
 * @return handle to the import process. It will die automatically
 *         when user cancels the process or when code automatically
 *         calls e_bg_image_import_cancel().  Before dying, callback
 *         will always be called.
 */
EAPI E_Bg_Image_Import_Handle *
e_bg_image_import(const char *image_file, void (*cb)(void *data, const char *edje_file), const void *data)
{
   E_Bg_Image_Import_Handle *handle;

   if (!image_file) return NULL;
   if (!cb) return NULL;

   handle = E_NEW(E_Bg_Image_Import_Handle, 1);
   if (!handle) return NULL;
   handle->cb.func = cb;
   handle->cb.data = (void *)data;

   handle->dia = e_util_image_import_settings_new
       (image_file, _e_bg_image_import_dialog_done, handle);
   if (!handle->dia)
     {
        free(handle);
        return NULL;
     }
   e_dialog_show(handle->dia);

   return handle;
}

/**
 * Cancels previously started import process.
 *
 * Note that his handle will be deleted when process import, so don't
 * call it after your callback is called!
 */
EAPI void
e_bg_image_import_cancel(E_Bg_Image_Import_Handle *handle)
{
   if (!handle) return;

   handle->canceled = EINA_TRUE;

   if (handle->cb.func)
     {
        handle->cb.func(handle->cb.data, NULL);
        handle->cb.func = NULL;
     }
   if (handle->dia)
     {
        e_object_del(E_OBJECT(handle->dia));
        handle->dia = NULL;
     }
   else if (handle->importer)
     {
        e_util_image_import_cancel(handle->importer);
        handle->importer = NULL;
     }
   E_FREE(handle);
}

/**
 * Set background to image, as required in e_fm2_mime_handler_new()
 */
EAPI void
e_bg_handler_set(Evas_Object *obj __UNUSED__, const char *path, void *data __UNUSED__)
{
   if (!path) return;

   if (_e_bg_file_edje_check(path))
     {
        char buf[PATH_MAX];
        int copy = 1;

        E_Container *con = e_container_current_get(e_manager_current_get());
        E_Zone *zone = e_zone_current_get(con);
        E_Desk *desk = e_desk_current_get(zone);

        /* if not in system dir or user dir, copy to user dir */
        e_prefix_data_concat_static(buf, "data/backgrounds");
        if (!strncmp(buf, path, strlen(buf)))
          copy = 0;
        if (copy)
          {
             e_user_dir_concat_static(buf, "backgrounds");
             if (!strncmp(buf, path, strlen(buf)))
               copy = 0;
          }
        if (copy)
          {
             const char *file;
             char *name;

             file = ecore_file_file_get(path);
             name = ecore_file_strip_ext(file);

             e_user_dir_snprintf(buf, sizeof(buf), "backgrounds/%s-%f.edj", name, ecore_time_unix_get());
             free(name);

             if (!ecore_file_exists(buf))
               {
                  ecore_file_cp(path, buf);
                  e_bg_add(con->num, zone->num, desk->x, desk->y, buf);
               }
             else
               e_bg_add(con->num, zone->num, desk->x, desk->y, path);
          }
        else
          e_bg_add(con->num, zone->num, desk->x, desk->y, path);

        e_bg_update();
        e_config_save_queue();
        return;
     }

   e_bg_image_import(path, _e_bg_handler_image_imported, NULL);
}

/**
 * Test if possible to set background to file, as required in
 * e_fm2_mime_handler_new()
 *
 * This handler tests for files that would be acceptable for setting
 * background.
 *
 * You should just register it with "*.edj" (glob matching extension)
 * or "image/" (mimetypes)that are acceptable with Evas loaders.
 *
 * Just edje files with "e/desktop/background" group are used.
 */
EAPI int
e_bg_handler_test(Evas_Object *obj __UNUSED__, const char *path, void *data __UNUSED__)
{
   if (!path) return 0;

   if (_e_bg_file_edje_check(path))
     {
        if (edje_file_group_exists(path, "e/desktop/background")) return 1;
        return 0;
     }

   /* it's image/png or image/jpeg, we'll import it. */
   return 1;
}

/* local subsystem functions */
static void
_e_bg_signal(void *data, Evas_Object *obj __UNUSED__, const char *emission __UNUSED__, const char *source __UNUSED__)
{
   E_Zone *zone = data;

   if (zone->prev_bg_object)
     {
        evas_object_del(zone->prev_bg_object);
        zone->prev_bg_object = NULL;
     }
   if (zone->transition_object)
     {
        evas_object_del(zone->transition_object);
        zone->transition_object = NULL;
     }
   evas_object_move(zone->bg_object, zone->x, zone->y);
   evas_object_resize(zone->bg_object, zone->w, zone->h);
   evas_object_layer_set(zone->bg_object, -1);
   evas_object_clip_set(zone->bg_object, zone->bg_clip_object);
   evas_object_show(zone->bg_object);
}

static void
_e_bg_event_bg_update_free(void *data __UNUSED__, void *event)
{
   free(event);
}

static void
_e_bg_image_import_dialog_done(void *data, const char *path, Eina_Bool ok, Eina_Bool external, int quality, E_Image_Import_Mode mode)
{
   E_Bg_Image_Import_Handle *handle = data;
   const char *file;
   char *name;
   char buf[PATH_MAX];
   size_t used, off;
   unsigned num;

   if (!ok) goto aborted;

   file = ecore_file_file_get(path);
   if (!file) goto aborted;
   name = ecore_file_strip_ext(file);
   if (!name) goto aborted;

   used = e_user_dir_snprintf(buf, sizeof(buf), "backgrounds/%s.edj", name);
   free(name);
   if (used >= sizeof(buf)) goto aborted;

   off = used - (sizeof(".edj") - 1);

   for (num = 0; ecore_file_exists(buf); num++)
     snprintf(buf + off, sizeof(buf) - off, "-%u.edj", num);

   handle->importer = e_util_image_import
       (path, buf, "e/desktop/background", external, quality, mode,
       _e_bg_image_import_done, handle);
   if (!handle->importer) goto aborted;

   return;

aborted:
   if (handle->cb.func)
     {
        handle->cb.func(handle->cb.data, NULL);
        handle->cb.func = NULL;
     }
   if (!handle->canceled) E_FREE(handle);
}

static void
_e_bg_image_import_done(void *data, Eina_Bool ok, const char *image_path __UNUSED__, const char *edje_path)
{
   E_Bg_Image_Import_Handle *handle = data;

   if (!ok) edje_path = NULL;

   if (handle->cb.func)
     {
        handle->cb.func(handle->cb.data, edje_path);
        handle->cb.func = NULL;
     }

   if (!handle->canceled) E_FREE(handle);
}

static void
_e_bg_handler_image_imported(void *data __UNUSED__, const char *image_path)
{
   E_Container *con = e_container_current_get(e_manager_current_get());
   E_Zone *zone = e_zone_current_get(con);
   E_Desk *desk = e_desk_current_get(zone);

   if (!image_path) return;

   e_bg_add(con->num, zone->num, desk->x, desk->y, image_path);
   e_bg_update();
   e_config_save_queue();
}