<?php

/**
 * This program 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 Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2015 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
 *
 */

namespace oat\taoItems\model\asset;

use \core_kernel_classes_Resource;
use \taoItems_models_classes_ItemsService;
use \common_Exception;
use \tao_helpers_File;
use oat\taoItems\model\media\ItemMediaResolver;

/**
 * To allow packing of Item. The goal of the packaging is to reprensent the data needed
 * to run an item (ie. an ItemPack).
 *
 * @author Bertrand Chevrier <bertrand@taotesting.com>
 * @deprecated use ItemMediaResolver directly
 */
class Loader
{

    /**
     * The item to pack
     * @var core_kernel_classes_Resource
     */
    private $item;

    /**
     * The lang of the item to pack
     * @var string
     */
    private $lang;

    /**
     * The item service
     * @var taoItems_models_classes_ItemsService
     */
    private $itemService;

    /**
     * Create a packer for an item
     * @param core_kernel_classes_Resource $item
     */
    public function __construct(core_kernel_classes_Resource $item, $lang = '')
    {
        $this->item = $item;
        $this->lang = $lang;
        $this->itemService = taoItems_models_classes_ItemsService::singleton();
    }

    /**
     * Get the content of an asset.
     *
     * @param string $assetPath the asset path
     * @return null|string the asset content or null if not stored locally
     * @throws common_Exception if the resource cannot be retrieved
     */
    public function getAssetContent($assetPath)
    {
        $mediaAsset = $this->getItemMediaResolver()->resolve($assetPath);
        $mediaSource = $mediaAsset->getMediaSource();
        $srcPath = $mediaSource->download($mediaAsset->getMediaIdentifier());
        return file_get_contents($srcPath);
    }

    protected function getItemMediaResolver()
    {
        return new ItemMediaResolver($this->item, $this->lang);
    }
}