#include "e.h"
#include <assert.h>

typedef struct _CFModule CFModule;
typedef struct _CFType   CFType;
typedef struct _CFTypes  CFTypes;

struct _CFModule
{
   const char  *short_name, *name, *comment;
   const char  *icon, *orig_path;
   E_Module    *module;
   Evas_Object *end;
   int          idx;
   Eina_Bool    enabled : 1;
};

struct _CFType
{
   const char *key, *name, *icon;
   Eina_Hash  *modules_hash; /* just used before constructing list */
   Eina_List  *modules; /* sorted and ready to be used */
};

struct _E_Config_Dialog_Data
{
   Evas                *evas;
   Evas_Object         *l_modules;
   Evas_Object         *o_toolbar;
   Evas_Object         *b_load, *b_unload;
   Evas_Object         *o_desc;
   Eina_List           *types;
   Ecore_Event_Handler *module_update;
   struct
   {
      Eina_List *loaded, *unloaded;
   } selected;
};

struct _CFTypes
{
   size_t      key_len;
   const char *key, *name, *icon;
};

/* pre defined types (used to specify icon and i18n name) */
static const CFTypes _types[] =
{
#define _CFT(k, n, i) \
  {sizeof(k) - 1, k, n, i}
   _CFT("utils", N_("Utilities"), "modules-utils"),
   _CFT("system", N_("System"), "modules-system"),
   _CFT("look", N_("Look"), "modules-look"),
   _CFT("files", N_("Files"), "modules-files"),
   _CFT("launcher", N_("Launcher"), "modules-launcher"),
   _CFT("core", N_("Core"), "modules-core"),
   _CFT("mobile", N_("Mobile"), "modules-mobile"),
   _CFT("settings", N_("Settings"), "modules-settings"),
#undef _CFT
   {0, NULL, NULL, NULL}
};

/* local function protos */
static void         _cftype_free(CFType *cft);

static void         _widget_list_selection_changed(void *data, Evas_Object *obj EINA_UNUSED);

static void        *_create_data(E_Config_Dialog *cfd);
static void         _free_data(E_Config_Dialog *cfd, E_Config_Dialog_Data *cfdata);
static Evas_Object *_basic_create(E_Config_Dialog *cfd, Evas *evas, E_Config_Dialog_Data *cfdata);
static void         _fill_cat_list(E_Config_Dialog_Data *cfdata);
static void         _module_end_state_apply(CFModule *cfm);

static void         _toolbar_select_cb(void *data, void *data2);

static CFType      *_cftype_find(E_Config_Dialog_Data *cfdata, const char *key, const char *name, const char *icon);
static CFType      *_cftype_new(const char *key, const char *name, const char *icon);
static void         _load_module(E_Module_Desktop *md, Eina_Hash *types_hash);
static Eina_Bool    _types_list_create_foreach_cb(const Eina_Hash *hash EINA_UNUSED, const void *key EINA_UNUSED, void *data, void *fdata);
static int          _types_list_sort(const void *data1, const void *data2);

static void         _btn_cb_unload(void *data, void *data2);
static void         _btn_cb_load(void *data, void *data2);

E_API E_Config_Dialog *
e_int_config_modules(Evas_Object *parent EINA_UNUSED, const char *params EINA_UNUSED)
{
   E_Config_Dialog *cfd = NULL;
   E_Config_Dialog_View *v = NULL;

   if (e_config_dialog_find("E", "extensions/modules")) return NULL;

   v = E_NEW(E_Config_Dialog_View, 1);
   v->create_cfdata = _create_data;
   v->free_cfdata = _free_data;
   v->basic.create_widgets = _basic_create;

   cfd = e_config_dialog_new(NULL, _("Module Settings"),
                             "E", "extensions/modules",
                             "preferences-plugin", 0, v, NULL);
   return cfd;
}

static void *
_create_data(E_Config_Dialog *cfd EINA_UNUSED)
{
   Eina_Hash *types_hash;
   Eina_List *mods;
   E_Module_Desktop *md;
   E_Config_Dialog_Data *cfdata;

   cfdata = E_NEW(E_Config_Dialog_Data, 1);

   types_hash = eina_hash_string_superfast_new(NULL);
   mods = e_module_desktop_list();
   if (!mods)
     {
        eina_hash_free(types_hash);
        return cfdata;
     }

   EINA_LIST_FREE(mods, md)
     {
        _load_module(md, types_hash);
        e_module_desktop_free(md);
     }

   eina_hash_foreach(types_hash, _types_list_create_foreach_cb, cfdata);
   eina_hash_free(types_hash);
   cfdata->types = eina_list_sort(cfdata->types, -1, _types_list_sort);

   return cfdata;
}

static void
_free_data(E_Config_Dialog *cfd EINA_UNUSED, E_Config_Dialog_Data *cfdata)
{
   CFType *cft;

   EINA_LIST_FREE(cfdata->types, cft)
     _cftype_free(cft);

   eina_list_free(cfdata->selected.loaded);
   eina_list_free(cfdata->selected.unloaded);
   if (cfdata->module_update) ecore_event_handler_del(cfdata->module_update);
   free(cfdata);
}

static Eina_Bool
_module_update(E_Config_Dialog_Data *cfdata, int type EINA_UNUSED, E_Event_Module_Update *ev)
{
   CFType *cft;
   Eina_List *l, *ll;
   CFModule *cfm;

   EINA_LIST_FOREACH(cfdata->types, l, cft)
     {
        EINA_LIST_FOREACH(cft->modules, ll, cfm)
          if (cfm->short_name == ev->name)
            {
               cfm->enabled = ev->enabled;
               _module_end_state_apply(cfm);
               return ECORE_CALLBACK_RENEW;
            }
     }

   return ECORE_CALLBACK_RENEW;
}

static Evas_Object *
_basic_create(E_Config_Dialog *cfd, Evas *evas, E_Config_Dialog_Data *cfdata)
{
   Evas_Coord mw, mh;
   Evas_Object *of, *ol;

   e_dialog_resizable_set(cfd->dia, 1);

   cfdata->evas = evas_object_evas_get(cfd->dia->win);

   of = e_widget_table_add(e_win_evas_win_get(evas), 0);

   cfdata->o_toolbar = e_widget_toolbar_add(evas, 32 * e_scale, 32 * e_scale);
   e_widget_toolbar_scrollable_set(cfdata->o_toolbar, 1);
   _fill_cat_list(cfdata);
   e_widget_table_object_append(of, cfdata->o_toolbar, 0, 0, 2, 1, 1, 1, 1, 0);

   cfdata->l_modules = e_widget_ilist_add(evas, 32 * e_scale, 32 * e_scale, NULL);
   e_widget_ilist_multi_select_set(cfdata->l_modules, EINA_TRUE);
   e_widget_ilist_go(cfdata->l_modules);
   e_widget_size_min_get(cfdata->l_modules, &mw, &mh);
   if (mw < (200 * e_scale)) mw = 200 * e_scale;
   if (mh < (100 * e_scale)) mh = 100 * e_scale;
   e_widget_size_min_set(cfdata->l_modules, mw, mh);
   e_widget_on_change_hook_set(cfdata->l_modules,
                               _widget_list_selection_changed, cfdata);
   e_widget_table_object_append(of, cfdata->l_modules, 0, 1, 2, 1, 1, 1, 1, 1);

   ol = e_widget_button_add(evas, _("Load"), NULL, _btn_cb_load, cfdata, NULL);
   cfdata->b_load = ol;
   e_widget_disabled_set(ol, 1);
   e_widget_table_object_append(of, ol, 0, 2, 1, 1, 1, 1, 1, 0);

   ol = e_widget_button_add(evas, _("Unload"), NULL, _btn_cb_unload, cfdata, NULL);
   cfdata->b_unload = ol;
   e_widget_disabled_set(ol, 1);
   e_widget_table_object_append(of, ol, 1, 2, 1, 1, 1, 1, 1, 0);

   ol = e_widget_textblock_add(evas);
   e_widget_size_min_set(ol, (200 * e_scale), 40 * e_scale);
   cfdata->o_desc = ol;
   e_widget_table_object_append(of, ol, 0, 3, 2, 1, 1, 0, 1, 0);

   e_dialog_resizable_set(cfd->dia, 1);
   e_util_win_auto_resize_fill(cfd->dia->win);
   elm_win_center(cfd->dia->win, 1, 1);

   e_widget_focus_set(cfdata->o_toolbar, 1);
   e_widget_toolbar_item_select(cfdata->o_toolbar, 0);

   cfdata->module_update = ecore_event_handler_add(E_EVENT_MODULE_UPDATE, (Ecore_Event_Handler_Cb)_module_update, cfdata);

   return of;
}

static void
_fill_cat_list(E_Config_Dialog_Data *cfdata)
{
   Evas_Coord w, h;
   Evas_Object *icon;
   CFType *cft;
   const CFTypes *itr;

   evas_event_freeze(cfdata->evas);
   edje_freeze();

   for (itr = _types; itr->key_len > 0; itr++)
     {
        cft = _cftype_find(cfdata, itr->key, itr->name, itr->icon);
        if (!cft)
          {
             WRN("CFT MISSING!!! key(%s) name(%s) icon(%s)", itr->key, itr->name, itr->icon);
             continue;
          }
        icon = e_icon_add(cfdata->evas);
        if (icon)
          {
             if (!e_util_icon_theme_set(icon, cft->icon))
               {
                  evas_object_del(icon);
                  icon = NULL;
               }
          }

        e_widget_toolbar_item_append(cfdata->o_toolbar, icon, _(cft->name),
                                     _toolbar_select_cb, cfdata, cft);
     }

   e_widget_size_min_get(cfdata->o_toolbar, &w, &h);
   e_widget_size_min_set(cfdata->o_toolbar, w, h);

   edje_thaw();
   evas_event_thaw(cfdata->evas);
}

static void
_list_item_append(E_Config_Dialog_Data *cfdata, CFModule *cfm)
{
   Evas_Object *icon, *end;

   if (!cfm->icon)
     icon = NULL;
   else
     {
        icon = e_icon_add(cfdata->evas);
        if (icon)
          {
             if (!e_util_icon_theme_set(icon, cfm->icon))
               {
                  if (cfm->orig_path)
                    {
                       char *dir = ecore_file_dir_get(cfm->orig_path);
                       char buf[PATH_MAX];

                       snprintf(buf, sizeof(buf), "%s/%s.edj", dir, cfm->icon);
                       free(dir);

                       e_icon_file_edje_set(icon, buf, "icon");
                    }
                  else
                    {
                       evas_object_del(icon);
                       icon = NULL;
                    }
               }
          }
     }

   end = edje_object_add(cfdata->evas);
   if (end)
     {
        if (e_theme_edje_object_set(end, "base/theme/widgets",
                                    "e/widgets/ilist/toggle_end"))
          {
             cfm->end = end;
             _module_end_state_apply(cfm);
          }
        else
          {
             EINA_LOG_ERR("your theme is missing 'e/widgets/ilist/toggle_end'!");
             evas_object_del(end);
             end = NULL;
          }
     }

   e_widget_ilist_append_full(cfdata->l_modules, icon, end,
                              cfm->name, NULL, cfm, NULL);
}

static void
_toolbar_select_cb(void *data, void *data2)
{
   CFType *cft, *cft_cat;
   E_Config_Dialog_Data *cfdata;
   Eina_List *l_type;
   Evas_Coord w, h;

   cfdata = data;
   cft_cat = data2;
   if (!cfdata || !cft_cat) return;

   eina_list_free(cfdata->selected.loaded);
   eina_list_free(cfdata->selected.unloaded);
   cfdata->selected.loaded = NULL;
   cfdata->selected.unloaded = NULL;
   e_widget_disabled_set(cfdata->b_load, EINA_TRUE);
   e_widget_disabled_set(cfdata->b_unload, EINA_TRUE);
   e_widget_textblock_markup_set(cfdata->o_desc, _("No modules selected."));

   evas_event_freeze(evas_object_evas_get(cfdata->l_modules));
   edje_freeze();
   e_widget_ilist_freeze(cfdata->l_modules);
   e_widget_ilist_clear(cfdata->l_modules);

   EINA_LIST_FOREACH(cfdata->types, l_type, cft)
     {
        CFModule *cfm;
        Eina_List *l_module;

        if (strcmp(cft->key, cft_cat->key))
          continue;

        EINA_LIST_FOREACH(cft->modules, l_module, cfm)
          _list_item_append(cfdata, cfm);
     }

   e_widget_ilist_go(cfdata->l_modules);
   e_widget_size_min_get(cfdata->l_modules, &w, &h);
   e_widget_size_min_set(cfdata->l_modules, w, h);
   e_widget_ilist_thaw(cfdata->l_modules);
   edje_thaw();
   evas_event_thaw(evas_object_evas_get(cfdata->l_modules));
}

static CFModule *
_module_new(const char *short_name, const Efreet_Desktop *desk)
{
   CFModule *cfm = E_NEW(CFModule, 1);

   if (!cfm) return NULL;
   cfm->short_name = eina_stringshare_add(short_name);

   if (desk->name)
     cfm->name = eina_stringshare_add(desk->name);
   else
     cfm->name = eina_stringshare_ref(cfm->short_name);

   cfm->icon = eina_stringshare_add(desk->icon);
   cfm->comment = eina_stringshare_add(desk->comment);
   cfm->orig_path = eina_stringshare_add(desk->orig_path);
   return cfm;
}

static void
_module_free(CFModule *cfm)
{
   eina_stringshare_del(cfm->short_name);
   eina_stringshare_del(cfm->name);
   eina_stringshare_del(cfm->icon);
   eina_stringshare_del(cfm->comment);
   eina_stringshare_del(cfm->orig_path);
   E_FREE(cfm);
}

static void
_module_end_state_apply(CFModule *cfm)
{
   const char *sig;

   if (!cfm->end) return;
   sig = cfm->enabled ? "e,state,checked" : "e,state,unchecked";
   edje_object_signal_emit(cfm->end, sig, "e");
}

static CFType *
_cftype_find(E_Config_Dialog_Data *cfdata, const char *key, const char *name, const char *icon)
{
   CFType *cft;
   Eina_List *l;

   EINA_LIST_FOREACH(cfdata->types, l, cft)
     if ((!strcmp(cft->key, key)) && (!strcmp(cft->name, name)) && (!strcmp(cft->icon, icon))) return cft;
   return NULL;
}

static CFType *
_cftype_new(const char *key, const char *name, const char *icon)
{
   CFType *cft = E_NEW(CFType, 1);

   if (!cft) return NULL;
   cft->key = eina_stringshare_add(key);
   cft->name = eina_stringshare_add(name);
   cft->icon = eina_stringshare_add(icon);
   //INF("CFT NEW: key(%s) name(%s) icon(%s)", key, name, icon);
   return cft;
}

static void
_cftype_free(CFType *cft)
{
   CFModule *cfm;

   assert(cft->modules_hash == NULL); // must do it before calling this function
   EINA_LIST_FREE(cft->modules, cfm)
     _module_free(cfm);

   eina_stringshare_del(cft->key);
   eina_stringshare_del(cft->name);
   eina_stringshare_del(cft->icon);
   E_FREE(cft);
}

static CFType *
_cftype_new_from_key(const char *key)
{
   const CFTypes *itr;
   char name[1024], icon[1024];
   size_t key_len;

   if (!key) return NULL;

   key_len = strlen(key);
   for (itr = _types; itr->key_len > 0; itr++)
     {
        if (key_len != itr->key_len) continue;
        if (strcmp(itr->key, key) != 0) continue;
        return _cftype_new(itr->key, itr->name, itr->icon);
     }

   if ((key_len + 1) >= sizeof(name)) return NULL;
   if ((key_len + sizeof("enlightenment/")) >= sizeof(icon)) return NULL;

   memcpy(name, key, key_len + 1);
   name[0] = toupper(name[0]);

   snprintf(icon, sizeof(icon), "enlightenment/%s", key);
   return _cftype_new(key, name, icon);
}

static void
_load_module(E_Module_Desktop *md, Eina_Hash *types_hash)
{
   CFType *cft;
   CFModule *cfm;
   const char *type, *mod;
   Eina_Bool new_type = EINA_FALSE;

   mod = ecore_file_file_get(md->dir);
   if (md->desktop->x)
     type = eina_hash_find(md->desktop->x, "X-Enlightenment-ModuleType");
   else
     type = NULL;
   if (!type) type = "utils";  // todo: warn?

   cft = eina_hash_find(types_hash, type);
   if (cft)
     {
        new_type = EINA_FALSE;
        if ((cft->modules_hash) &&
            (eina_hash_find(cft->modules_hash, mod)))
          return;
     }
   else
     {
        cft = _cftype_new_from_key(type);
        if (cft) new_type = EINA_TRUE;
        else return;
     }

   cfm = _module_new(mod, md->desktop);
   if (!cfm)
     {
        if (new_type) _cftype_free(cft);
        return;
     }

   if (!cft->modules_hash)
     cft->modules_hash = eina_hash_string_superfast_new(NULL);
   eina_hash_direct_add(cft->modules_hash, cfm->short_name, cfm);
   cft->modules = eina_list_append(cft->modules, cfm);
   cfm->module = e_module_find(mod);
   if (cfm->module)
     cfm->enabled = e_module_enabled_get(cfm->module);
   else
     cfm->enabled = 0;

   if (new_type)
     eina_hash_direct_add(types_hash, cft->key, cft);
}

static int
_modules_list_sort(const void *data1, const void *data2)
{
   const CFModule *m1 = data1, *m2 = data2;
   return strcmp(m1->name, m2->name);
}

static Eina_Bool
_types_list_create_foreach_cb(const Eina_Hash *hash EINA_UNUSED, const void *key EINA_UNUSED, void *data, void *fdata)
{
   E_Config_Dialog_Data *cfdata = fdata;
   CFType *cft = data;

   // otherwise it should not be here
   assert(cft->modules);
   assert(cft->modules_hash);

   eina_hash_free(cft->modules_hash);
   cft->modules_hash = NULL;

   cft->modules = eina_list_sort(cft->modules, -1, _modules_list_sort);
   cfdata->types = eina_list_append(cfdata->types, cft);
   // TODO be paranoid about list append failure, otherwise leaks memory
   return EINA_TRUE;
}

static int
_types_list_sort(const void *data1, const void *data2)
{
   const CFType *t1 = data1, *t2 = data2;
   return strcmp(t1->name, t2->name);
}

static void
_widget_list_selection_changed(void *data, Evas_Object *obj EINA_UNUSED)
{
   E_Config_Dialog_Data *cfdata = data;
   const Eina_List *l;
   const E_Ilist_Item *it;
   CFModule *cfm = NULL;
   const char *description;

   cfdata->selected.loaded = eina_list_free(cfdata->selected.loaded);
   cfdata->selected.unloaded = eina_list_free(cfdata->selected.unloaded);

   EINA_LIST_FOREACH(e_widget_ilist_selected_items_get(cfdata->l_modules), l, it)
     {
        cfm = e_widget_ilist_item_data_get(it);

        if (cfm->enabled)
          {
             cfdata->selected.loaded =
               eina_list_append(cfdata->selected.loaded, cfm);
             e_widget_disabled_set(cfdata->b_unload, 0);
             e_widget_disabled_set(cfdata->b_load, 1);
          }
        else
          {
             cfdata->selected.unloaded =
               eina_list_append(cfdata->selected.unloaded, cfm);
             e_widget_disabled_set(cfdata->b_load, 0);
             e_widget_disabled_set(cfdata->b_unload, 1);
          }
     }

   if ((cfm) && (eina_list_count(cfdata->selected.loaded) + eina_list_count(cfdata->selected.unloaded) == 1))
     description = cfm->comment;
   else if (eina_list_count(cfdata->selected.loaded) + eina_list_count(cfdata->selected.unloaded) > 1)
     description = _("More than one module selected.");
   else
     description = _("No modules selected.");

   e_widget_textblock_markup_set(cfdata->o_desc, description);
}

static void
_btn_cb_unload(void *data, void *data2 EINA_UNUSED)
{
   E_Config_Dialog_Data *cfdata = data;
   CFModule *cfm;

   EINA_LIST_FREE(cfdata->selected.loaded, cfm)
     {
        if (!cfm->module)
          cfm->module = e_module_find(cfm->short_name);

        if (cfm->module)
          {
             e_module_disable(cfm->module);
             cfm->enabled = e_module_enabled_get(cfm->module);
          }

        _module_end_state_apply(cfm);
        cfdata->selected.unloaded = eina_list_append(cfdata->selected.unloaded, cfm);
     }

   e_widget_disabled_set(cfdata->b_unload, 1);
   e_widget_disabled_set(cfdata->b_load, 0);
}

static void
_btn_cb_load(void *data, void *data2 EINA_UNUSED)
{
   E_Config_Dialog_Data *cfdata = data;
   CFModule *cfm;

   EINA_LIST_FREE(cfdata->selected.unloaded, cfm)
     {
        if (!cfm->module)
          cfm->module = e_module_find(cfm->short_name);
        if (!cfm->module)
          cfm->module = e_module_new(cfm->short_name);

        if (cfm->module)
          {
             e_module_enable(cfm->module);
             cfm->enabled = e_module_enabled_get(cfm->module);
          }

        _module_end_state_apply(cfm);
        cfdata->selected.loaded = eina_list_append(cfdata->selected.loaded, cfm);
     }

   e_widget_disabled_set(cfdata->b_load, 1);
   e_widget_disabled_set(cfdata->b_unload, 0);
}