<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Media
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Media library file image resource model
 *
 * @category   Mage
 * @package    Mage_Media
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Media_Model_File_Image extends Mage_Core_Model_Resource_Abstract
{
    /**
     * Resource initialization
     */
    protected function _construct()
    {
        return $this;
    }

    /**
     * Retrieve connection for read data
     */
    protected function _getReadAdapter()
    {
        return false;
    }

    /**
     * Retrieve connection for write data
     */
    protected function _getWriteAdapter()
    {
        return false;
    }

    public function load(Mage_Media_Model_Image $object, $file, $field=null)
    {
        // Do some implementation
        return $this;
    }

    public function save(Mage_Media_Model_Image $object)
    {
        // Do some implementation
        return $this;
    }

    public function delete(Mage_Media_Model_Image $object)
    {
        return $this;
    }

    /**
     * Create image resource for operation from file
     *
     * @param Mage_Media_Model_Image $object
     * @return Mage_Media_Model_File_Image
     */
    public function getImage(Mage_Media_Model_Image $object)
    {
        $resource = false;
        switch(strtolower($object->getExtension())) {
            case 'jpg':
            case 'jpeg':
                $resource = imagecreatefromjpeg($object->getFilePath());
                break;

            case 'gif':
                $resource = imagecreatefromgif($object->getFilePath());
                break;

            case 'png':
                $resource = imagecreatefrompng($object->getFilePath());
                break;
        }

        if(!$resource) {
            Mage::throwException(Mage::helper('media')->__('The image does not exist or is invalid.'));
        }


        return $resource;
    }

    /**
     * Create tmp image resource for operations
     *
     * @param Mage_Media_Model_Image $object
     * @return Mage_Media_Model_File_Image
     */
    public function getTmpImage(Mage_Media_Model_Image $object)
    {
        $resource = imagecreatetruecolor($object->getDestanationDimensions()->getWidth(), $object->getDestanationDimensions()->getHeight());
        return $resource;
    }

    /**
     * Resize image
     *
     * @param Mage_Media_Model_Image $object
     * @return Mage_Media_Model_File_Image
     */
    public function resize(Mage_Media_Model_Image $object)
    {
        $tmpImage = $object->getTmpImage();
        $sourceImage = $object->getImage();

        imagecopyresampled(
            $tmpImage,
            $sourceImage,
            0, 0, 0, 0,
            $object->getDestanationDimensions()->getWidth(),
            $object->getDestanationDimensions()->getHeight(),
            $object->getDimensions()->getWidth(),
            $object->getDimensions()->getHeight()
        );

        return $this;
    }

    /**
     * Add watermark for image
     *
     * @param Mage_Media_Model_Image $object
     * @return Mage_Media_Model_File_Image
     */
    public function watermark(Mage_Media_Model_Image $object)
    {
        return $this;
    }

    /**
     * Creates image
     *
     * @param Mage_Media_Model_Image $object
     * @param string|null $extension
     * @return Mage_Media_Model_File_Image
     */
    public function saveAs(Mage_Media_Model_Image $object, $extension=null)
    {
        if(is_null($extension)) {
            $extension = $object->getExtension();
        }

        $result = false;
        switch (strtolower($extension)) {
            case 'jpg':
            case 'jpeg':
                $result = imagejpeg($object->getTmpImage(), $object->getFilePath(true), 80);
                break;
            case 'gif':
                $result = imagegif($object->getTmpImage(), $object->getFilePath(true));
                break;
            case 'png':
                $result = imagepng($object->getTmpImage(), $object->getFilePath(true));
                break;
        }

        if(!$result) {
            Mage::throwException(Mage::helper('media')->__('An error occurred while creating the image.'));
        }

        return $this;
    }

    /**
     * Retrive image dimensions
     *
     * @param Mage_Media_Model_Image $object
     * @return Varien_Object
     */
    public function getDimensions(Mage_Media_Model_Image $object)
    {
        $info = @getimagesize($object->getFilePath());
        if(!$info) {
            Mage::throwException(Mage::helper('media')->__('The image does not exist or is invalid.'));
        }

        $info = array('width'=>$info[0], 'height'=>$info[1], 'type'=>$info[2]);
        return new Varien_Object($info);
    }

    /**
     * Destroys resource object
     *
     * @param resource $resource
     */
    public function destroyResource(&$resource)
    {
        imagedestroy($resource);
        return $this;
    }

    /**
     * Destroys resource object
     *
     * @param resource $resource
     */
    public function hasSpecialImage(Mage_Media_Model_Image $object)
    {
        if(file_exists($object->getFilePath(true))) {
            return true;
        }

        return false;
    }


}
