#include "ephoto.h"

#define ZOOM_MAX 512
#define ZOOM_MIN 128
#define ZOOM_STEP 32

#define TODO_ITEM_MIN_BATCH 16

typedef struct _Ephoto_Thumb_Browser Ephoto_Thumb_Browser;

struct _Ephoto_Thumb_Browser
{
   Ephoto *ephoto;
   Ephoto_Entry *entry;
   Evas_Object *grid;
   Eio_File *ls;
   Eina_List *todo_items;
   Eina_List *grid_items;
   Eina_List *handlers;
   struct {
      Ecore_Animator *todo_items;
   } animator;
   Eina_Bool layout_deleted : 1;
};

static void
_todo_items_free(Ephoto_Thumb_Browser *tb)
{
   eina_list_free(tb->todo_items);
   tb->todo_items = NULL;
}

static void
_grid_items_free(Ephoto_Thumb_Browser *tb)
{
   eina_list_free(tb->grid_items);
   tb->grid_items = NULL;
}

static char *
_ephoto_thumb_item_label_get(void *data, Evas_Object *obj __UNUSED__, const char *part __UNUSED__)
{
   Ephoto_Entry *e = data;
   return strdup(e->label);
}

static Evas_Object *
_ephoto_thumb_file_icon_get(void *data, Evas_Object *obj, const char *part __UNUSED__)
{
   Ephoto_Entry *e = data;
   return ephoto_thumb_add(e->ephoto, obj, e->path);
}

static void
_ephoto_thumb_item_del(void *data __UNUSED__, Evas_Object *obj __UNUSED__)
{
   /* FIXME: the entry is already freed when changing directories
    * One solution is to take care of this cleaning when manually removing
    * some grid items
   Ephoto_Entry *e = data;
   e->item = NULL;
   */
}

static const Elm_Gengrid_Item_Class _ephoto_thumb_file_class = {
  "thumb",
  {
    _ephoto_thumb_item_label_get,
    _ephoto_thumb_file_icon_get,
    NULL,
    _ephoto_thumb_item_del
  }
};

static int
_entry_cmp(const void *pa, const void *pb)
{
   const Ephoto_Entry *a = pa, *b = pb;
   int ret, s;
  
   s = strcmp(a->basename, b->basename);
   if (s > 0)
     ret = 1;
   else if (s < 0)
     ret = -1;
   else
     ret = 0; 
   return ret;
}

static void
_entry_item_add(Ephoto_Thumb_Browser *tb, Ephoto_Entry *e)
{
   const Elm_Gengrid_Item_Class *ic;
  
   ic = &_ephoto_thumb_file_class;

   if (!tb->grid_items)
     {
        e->item = elm_gengrid_item_append(tb->grid, ic, e, NULL, NULL);
        tb->grid_items = eina_list_append(tb->grid_items, e);
     }
   else
     {
        int near_cmp;
        Ephoto_Entry *near_entry;
        Elm_Gengrid_Item *near_item;
        Eina_List *near_node = eina_list_search_sorted_near_list
          (tb->grid_items, _entry_cmp, e, &near_cmp);
       
        near_entry = near_node->data;
        near_item = near_entry->item;
        if (near_cmp < 0)
          {
             e->item = elm_gengrid_item_insert_after
               (tb->grid, ic, e, near_item, NULL, NULL);
             tb->grid_items = eina_list_append_relative_list
               (tb->grid_items, e, near_node);
          }
        else
          {
             e->item = elm_gengrid_item_insert_before
               (tb->grid, ic, e, near_item, NULL, NULL);
             tb->grid_items = eina_list_prepend_relative_list
               (tb->grid_items, e, near_node);
          }
     }
   if (e->item)
     elm_gengrid_item_data_set(e->item, e);
   else
     {
        ERR("could not add item to grid: path '%s'", e->path);
        ephoto_entry_free(e);
        return;
     }
}

static Eina_Bool
_todo_items_process(void *data)
{
   Ephoto_Thumb_Browser *tb = data;
   Ephoto_Entry *entry;

   if ((tb->ls) && (eina_list_count(tb->todo_items) < TODO_ITEM_MIN_BATCH))
     return EINA_TRUE;

   tb->animator.todo_items = NULL;

   EINA_LIST_FREE(tb->todo_items, entry)
     _entry_item_add(tb, entry);

   return EINA_FALSE;
}

static void
_ephoto_thumb_selected(void *data, Evas_Object *o __UNUSED__, void *event_info)
{
   Ephoto_Thumb_Browser *tb = data;
   Elm_Gengrid_Item *it = event_info;
   Ephoto_Entry *e = elm_gengrid_item_data_get(it);

   elm_gengrid_item_selected_set(it, EINA_FALSE);

   ephoto_promote_single_browser(tb->ephoto, e);
}

static void
_zoom_set(Ephoto_Thumb_Browser *tb, int zoom)
{
   if (zoom > ZOOM_MAX) zoom = ZOOM_MAX;
   else if (zoom < ZOOM_MIN) zoom = ZOOM_MIN;

   ephoto_thumb_size_set(tb->ephoto, zoom);
   elm_gengrid_item_size_set(tb->grid, zoom, zoom);
}

static void
_grid_del(void *data, Evas *e __UNUSED__, Evas_Object *o __UNUSED__, void *event_info __UNUSED__)
{
   Ephoto_Thumb_Browser *tb = data;
   Ecore_Event_Handler *handler;

   _todo_items_free(tb);
   _grid_items_free(tb);
   EINA_LIST_FREE(tb->handlers, handler)
      ecore_event_handler_del(handler);

   if (tb->animator.todo_items)
     {
        ecore_animator_del(tb->animator.todo_items);
        tb->animator.todo_items = NULL;
     }
   if (tb->ls)
     {
        tb->layout_deleted = EINA_TRUE;
        eio_file_cancel(tb->ls);
        return;
     }
   free(tb);
}

static Eina_Bool
_ephoto_thumb_populate_start(void *data, int type __UNUSED__, void *event __UNUSED__)
{
   Ephoto_Thumb_Browser *tb = data;

   _todo_items_free(tb);
   _grid_items_free(tb);
   elm_gengrid_clear(tb->grid);

   return ECORE_CALLBACK_PASS_ON;
}

static Eina_Bool
_ephoto_thumb_populate_end(void *data, int type __UNUSED__, void *event __UNUSED__)
{
   Ephoto_Thumb_Browser *tb = data;

   tb->ls = NULL;
   if (tb->layout_deleted)
     {
        free(tb);
        return ECORE_CALLBACK_PASS_ON;
     }

   return ECORE_CALLBACK_PASS_ON;
}

static Eina_Bool
_ephoto_thumb_populate_error(void *data __UNUSED__, int type __UNUSED__, void *event __UNUSED__)
{
   return ECORE_CALLBACK_PASS_ON;
}

static Eina_Bool
_ephoto_thumb_entry_create(void *data, int type __UNUSED__, void *event)
{
   Ephoto_Thumb_Browser *tb = data;
   Ephoto_Event_Entry_Create *ev = event;
   Ephoto_Entry *e;

   e = ev->entry;
   tb->todo_items = eina_list_append(tb->todo_items, e);

   if (!tb->animator.todo_items)
     tb->animator.todo_items = ecore_animator_add(_todo_items_process, tb);

   return ECORE_CALLBACK_PASS_ON;
}

Evas_Object *
ephoto_thumb_browser_add(Ephoto *ephoto, Evas_Object *parent)
{
   Ephoto_Thumb_Browser *tb;

   tb = calloc(1, sizeof(Ephoto_Thumb_Browser));
   EINA_SAFETY_ON_NULL_GOTO(tb, error);
   tb->ephoto = ephoto;

   tb->grid = elm_gengrid_add(parent);
   EINA_SAFETY_ON_NULL_GOTO(tb->grid, error);
   elm_gengrid_align_set(tb->grid, 0.5, 0.5);
   elm_gengrid_bounce_set(tb->grid, EINA_FALSE, EINA_TRUE);
   evas_object_size_hint_align_set
     (tb->grid, EVAS_HINT_FILL, EVAS_HINT_FILL);
   evas_object_size_hint_weight_set
     (tb->grid, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
   evas_object_smart_callback_add
     (tb->grid, "selected", _ephoto_thumb_selected, tb);
   _zoom_set(tb, tb->ephoto->config->thumb_size);
   evas_object_event_callback_add(tb->grid, EVAS_CALLBACK_DEL, _grid_del, tb);
   evas_object_data_set(tb->grid, "thumb_browser", tb);
   evas_object_show(tb->grid);

   tb->handlers = eina_list_append
      (tb->handlers, ecore_event_handler_add
       (EPHOTO_EVENT_POPULATE_START, _ephoto_thumb_populate_start, tb));

   tb->handlers = eina_list_append
      (tb->handlers, ecore_event_handler_add
       (EPHOTO_EVENT_POPULATE_END, _ephoto_thumb_populate_end, tb));

   tb->handlers = eina_list_append
      (tb->handlers, ecore_event_handler_add
       (EPHOTO_EVENT_POPULATE_ERROR, _ephoto_thumb_populate_error, tb));

   tb->handlers = eina_list_append
      (tb->handlers, ecore_event_handler_add
       (EPHOTO_EVENT_ENTRY_CREATE_THUMB, _ephoto_thumb_entry_create, tb));

   return tb->grid;

 error:
   evas_object_del(tb->grid);
   return NULL;
}

void
ephoto_thumb_browser_entry_set(Evas_Object *obj, Ephoto_Entry *entry)
{
   Ephoto_Thumb_Browser *tb = evas_object_data_get(obj, "thumb_browser");
   tb->entry = entry;
}