/*
 * Copyright (c) 2015 Samsung Electronics Co., Ltd All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the License);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an AS IS BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <Elementary.h>
#include <media_content.h>
#include <app_debug.h>
#include <app_media.h>
#include <gridmgr.h>
#include <inputmgr.h>
#include <layoutmgr.h>
#include <viewmgr.h>

#include "define.h"
#include "layout.h"
#include "view.h"
#include "data/datamgr.h"
#include "grid/grid.h"
#include "util/listmgr.h"
#include "util/util.h"
#include "util/locmgr.h"

#define TEXT_NOCONTENT "No Photo & Video"

#define GRID_PADDING 6
#define GRID_ITEM_X (200 + GRID_PADDING)
#define GRID_ITEM_Y (200 + GRID_PADDING)
#define GRID_NUM_ITEM 3

#define BOX_PADDING (62 - GRID_PADDING)

#define JOB_INTERVAL 1.0

struct _priv {
	Evas_Object *base;
	Evas_Object *layout;
	Evas_Object *menu_btn;
	Evas_Object *view_btn;

	layoutmgr *lmgr;

	struct listmgr *listmgr;
	struct listmgr_data *ldata;

	struct datamgr *dmgr[E_DATA_MAX];

	Eina_List *media_list;

	int view_mode;
	struct grid_data *gdata;

	struct locmgr *locmgr;
};

static void _recent_item_selected(struct _priv *priv, app_media *am)
{
	app_media_info *info;
	struct view_update_data vdata;
	struct datamgr *dmgr;

	info = app_media_get_info(am);
	if (!info) {
		_ERR("failed to get app media info");
		return;
	}

	dmgr = priv->dmgr[E_DATA_MEDIA];
	if (!dmgr)
		return;

	vdata.list = dmgr->ops->get_list(dmgr->handle, E_LIST_MEDIA, NULL);
	vdata.index = util_get_media_index_from_id(vdata.list, info->media_id);

	viewmgr_update_view(VIEW_VIEWER, UPDATE_CONTENT, &vdata);
	viewmgr_push_view(VIEW_VIEWER);
}

static struct listmgr_data *_create_listmgr_data(struct _priv *priv)
{
	struct listmgr_data *data;

	data = calloc(1, sizeof(*data));
	if (!data) {
		_ERR("failed to allocate memory");
		return NULL;
	}

	data->menu_btn = priv->menu_btn;
	data->view_btn = priv->view_btn;

	return data;
}

static void _update_content_info(struct _priv *priv)
{
	struct datamgr *dmgr;
	int photo, video;
	char buf[128];

	dmgr = priv->dmgr[E_DATA_MEDIA];
	if (!dmgr)
		return;

	photo = dmgr->ops->get_count(dmgr->handle, E_FILE_PHOTO);
	video = dmgr->ops->get_count(dmgr->handle, E_FILE_VIDEO);

	if (photo < 0 || video < 0) {
		_ERR("failed to get media count");
		return;
	}

	snprintf(buf, sizeof(buf), "%d Photos, %d Videos", photo, video);

	elm_object_part_text_set(priv->base, PART_BASE_CONTENT_INFO, buf);
}

static void _clear_content_list(struct _priv *priv)
{
	if (priv->media_list) {
		priv->gdata->free_item_list(priv->dmgr[E_DATA_MEDIA],
				priv->media_list);
		priv->media_list = NULL;
	}

	listmgr_clear_content_list(priv->listmgr);
}

static void _update_content_list(struct _priv *priv)
{
	Eina_List *list;

	if (priv->media_list) {
		_update_content_info(priv);
		return;
	}

	priv->gdata = get_gallery_grid_data(priv->view_mode);

	list = priv->gdata->get_item_list(priv->dmgr[E_DATA_MEDIA]);
	if (!list) {
		elm_object_part_text_set(priv->layout,
				PART_NOCONTENT, TEXT_NOCONTENT);
		return;
	}

	priv->gdata->data = priv->dmgr[E_DATA_MEDIA];

	if (!listmgr_update_content_list(priv->listmgr, list, priv->gdata))
		_ERR("failed to update list area");

	priv->media_list = list;

	_update_content_info(priv);
}

static void _destroy_datamgr(struct _priv *priv)
{
	int i;

	for (i = 0; i < E_DATA_MAX; i++)
		datamgr_destroy(priv->dmgr[i]);
}

static void _destroy_utils(struct _priv *priv)
{
	locmgr_destroy(priv->locmgr);
	_destroy_datamgr(priv);

	listmgr_destroy(priv->listmgr);
	free(priv->ldata);
}

static Eina_Bool _create_location(void *data)
{
	struct _priv *priv;
	struct locmgr *locmgr;
	struct datamgr *dmgr;

	if (!data) {
		_ERR("invalid argument");
		return ECORE_CALLBACK_CANCEL;
	}

	priv = data;

	if (!priv->dmgr) {
		_ERR("failed to get datamgr");
		return ECORE_CALLBACK_CANCEL;
	}

	dmgr = priv->dmgr[E_DATA_MEDIA];
	if (!dmgr) {
		_ERR("failed to get datamgr");
		return ECORE_CALLBACK_CANCEL;
	}

	locmgr = locmgr_create();
	if (!locmgr) {
		_ERR("failed to create locmgr");
		return ECORE_CALLBACK_CANCEL;
	}

	priv->locmgr = locmgr;

	locmgr_set_locations(locmgr,
			dmgr->ops->get_list(dmgr->handle, E_LIST_MEDIA, NULL));

	return ECORE_CALLBACK_CANCEL;
}

static bool _create_utils(struct _priv *priv)
{
	struct listmgr *listmgr;
	struct listmgr_data *ldata;
	struct datamgr *dmgr;
	int i;

	for (i = 0; i < E_DATA_MAX; i++) {
		dmgr = datamgr_create(i, GALLERY_MEDIA_COND, E_SOURCE_ALL);
		if (!dmgr) {
			_ERR("failed to create datamgr");
			_destroy_datamgr(priv);
			return false;
		}

		priv->dmgr[i] = dmgr;
	}

	ldata = _create_listmgr_data(priv);
	if (!ldata) {
		_ERR("failed to create listmgr data");
		_destroy_datamgr(priv);
		return false;
	}

	listmgr = listmgr_create(priv->layout, (void *)ldata);
	if (!listmgr) {
		_ERR("failed to create listmgr");
		_destroy_datamgr(priv);
		free(ldata);
		return false;
	}

	priv->ldata = ldata;
	priv->listmgr = listmgr;

	return true;
}

static bool _create(layoutmgr *lmgr, void *data)
{
	struct layout_data *ld;
	struct _priv *priv;
	Evas_Object *base, *layout;

	if (!lmgr) {
		_ERR("failed to get layoutmgr");
		return false;
	}

	if (!data) {
		_ERR("invalid argument");
		return false;
	}

	ld = data;

	priv = calloc(1, sizeof(*priv));
	if (!priv) {
		_ERR("failed to allocate priv");
		return false;
	}

	base = layoutmgr_get_base(lmgr);
	if (!base) {
		_ERR("failed to get base object");
		goto err;
	}

	layout = elm_layout_add(base);
	if (!layout) {
		_ERR("failed to create layout");
		goto err;
	}

	if (!elm_layout_file_set(layout, EDJEFILE, GRP_GALLERY_LAYOUT)) {
		_ERR("failed to set layout file");
		goto err2;
	}

	priv->base = base;
	priv->layout = layout;
	priv->menu_btn = ld->top;
	priv->view_btn = ld->bottom;
	priv->lmgr = lmgr;
	priv->gdata = get_gallery_grid_data(E_GALLERY_EVENT);

	if (!_create_utils(priv)) {
		_ERR("failed to create utils");
		goto err2;
	}

	layoutmgr_set_layout_data(lmgr, LAYOUT_GALLERY, priv);

	if (!listmgr_draw_list_area(priv->listmgr)) {
		_ERR("failed to draw list area");
		goto err3;
	}

	/* add job for set location tag */
	ecore_timer_add(JOB_INTERVAL, _create_location, priv);

	return true;

err3:
	_destroy_utils(priv);
err2:
	evas_object_del(layout);
err:
	free(priv);
	return false;
}

static void _destroy(void *layout_data)
{
	struct _priv *priv;

	if (!layout_data) {
		_ERR("failed to get layout data");
		return;
	}

	priv = layout_data;

	priv->gdata->free_item_list(priv->dmgr[E_DATA_MEDIA], priv->media_list);

	_destroy_utils(priv);

	evas_object_del(priv->layout);

	free(priv);
}

static void _show(void *layout_data)
{
	struct _priv *priv;

	if (!layout_data) {
		_ERR("failed to layout data");
		return;
	}

	priv = layout_data;

	evas_object_show(priv->layout);
	elm_object_part_content_set(priv->base,
			PART_BASE_THUMBNAIL_AREA, priv->layout);
}

static void _hide(void *layout_data)
{
	struct _priv *priv;

	if (!layout_data) {
		_ERR("failed to get layout data");
		return;
	}

	priv = layout_data;

	evas_object_hide(priv->layout);
	elm_object_part_content_unset(priv->base, PART_BASE_THUMBNAIL_AREA);
}

static void _update(void *layout_data, int update_type, void *data)
{
	struct view_update_data *vdata;
	struct _priv *priv;
	int mode;

	if (!layout_data) {
		_ERR("failed to get layout data");
		return;
	}

	priv = layout_data;

	switch (update_type) {
	case UPDATE_CONTENT:
		_update_content_list(priv);
		break;
	case UPDATE_CONTENT_ITEM:
		listmgr_update_content_item(priv->listmgr);
		break;
	case UPDATE_FOCUS:
		if (!data) {
			_ERR("invalid argument");
			return;
		}

		vdata = data;

		listmgr_focus_content_list(priv->listmgr, vdata->id);
		break;
	case UPDATE_RECENT:
		if (!data) {
			_ERR("invalid argument");
			return;
		}

		_update_content_list(priv);
		_recent_item_selected(priv, data);
		break;
	case UPDATE_FOCUS_STATE:
		listmgr_set_focus_state(priv->listmgr, EINA_FALSE);
		break;
	case UPDATE_VIEW_MODE:
		if (!data) {
			_ERR("invalid argument");
			return;
		}

		vdata = data;
		mode = vdata->index;

		/* Place and folder view mode will be implemented later. */
		if (mode == E_GALLERY_PLACE || mode == E_GALLERY_FOLDER)
			return;

		if (mode == priv->view_mode)
			return;

		_clear_content_list(priv);

		priv->view_mode = mode;
		_update_content_list(priv);
		break;
	default:
		break;
	}
}

static layout_class _lclass = {
	.layout_id = LAYOUT_GALLERY,
	.create = _create,
	.show = _show,
	.hide = _hide,
	.destroy = _destroy,
	.update = _update,
};

layout_class *layout_gallery_get_lclass(void)
{
	return &_lclass;
}