<?php
/**
 * @package   ImpressPages
 *
 *
 */

namespace Modules\administrator\repository\Transform;

class ImageCrop extends Image
{
    protected $x1;
    protected $y1;
    protected $x2;
    protected $y2;
    protected $widthDest;
    protected $heightDest;
    protected $quality;

    /**
     * @param int $x1 left top coordinate of source
     * @param int $y1 left top coordinate of source
     * @param int $x2 right bottom coordinate of source
     * @param int $y2 right bottom coordinate of source
     * @param int $widthDest required width of destination image
     * @param int $heightDest required height of destination image
     * @param null $quality
     */
    public function __construct($x1, $y1, $x2, $y2, $widthDest, $heightDest, $quality = null)
    {
        global $parametersMod;
        if ($quality === null)
        {
            $quality = $parametersMod->getValue('standard', 'configuration', 'advanced_options', 'default_image_quality');
        }

        list($x1, $y1, $x2, $y2) = $this->fixSourceRatio($x1, $y1, $x2, $y2, $widthDest, $heightDest);

        $this->x1 = $x1;
        $this->y1 = $y1;
        $this->x2 = $x2;
        $this->y2 = $y2;
        $this->widthDest = $widthDest;
        $this->heightDest = $heightDest;
        $this->quality = $quality;
    }

    /**
     * @param string $sourceFile
     * @param string $destinationFile
     * @return void
     */
    public function transform($sourceFile, $destinationFile)
    {
        //check if modifications are needed
        if (!$this->resizeRequired($sourceFile)) {
            copy($sourceFile, $destinationFile);
            return;
        }

        //modify image
        $croppedImage = $this->crop(
            $sourceFile,
            $this->x1,
            $this->y1,
            $this->x2,
            $this->y2,
            $this->widthDest,
            $this->heightDest
        );

        self::saveImage($croppedImage, $destinationFile, $this->quality);
    }


    /**
     * If cropping area goes out of image, jpg is converted to png to make transparent edges
     * @param string $file original file
     * @param string $ext original file extension
     * @return string
     */
    public function getNewExtension($sourceFile, $ext)
    {
        switch (strtolower($ext)) {
            case 'png':
            case 'gif':
                return 'png';
                break;
            case 'jpeg':
            case 'jpg':
                if ($this->croppingGoesOutOfImage($sourceFile, $this->x1, $this->y1, $this->x2, $this->y2)) {
                    return 'png';
                } else {
                    return $ext;
                }
                break;
            default:
                return 'png';
        }

    }



    public function crop($sourceFile, $x1, $y1, $x2, $y2, $widthDest, $heightDest)
    {
        $image = $this->createImageImage($sourceFile);


        if ($widthDest === null) {
            $widthDest = $x2 - $x1;
        }
        if ($heightDest === null) {
            $heightDest = $y2 - $y1;
        }



        if ($this->croppingGoesOutOfImage($sourceFile, $x1, $y1, $x2, $y2)) { //cropping area goes out of image edge. Fill transparent.
            /*
            * Negative coordinates x1, y1 are possible.
            * This part of code just adds transparent edges in this way making $image required proportions.
            * We don't care about the size in this step.
            *
            * */
            $tmpImage = imagecreatetruecolor($x2 - $x1, $y2 - $y1);
            imagealphablending($tmpImage, false);
            imagesavealpha($tmpImage,true);
            $color = imagecolorallocatealpha($tmpImage, 255, 255, 255, 127);
            imagefilledrectangle($tmpImage, 0, 0, $x2 - $x1, $y2 - $y1, $color);
            if ($x1 >= 0) {
                $sx1 = $x1;
                $dx1 = 0;
            } else {
                $sx1 = 0;
                $dx1 = -$x1;
            }
            if ($y1 >= 0) {
                $sy1 = $y1;
                $dy1 = 0;
            } else {
                $sy1 = 0;
                $dy1 = -$y1;
            }
            if ($x2 - $x1 > imagesx($image)) {
                $sx2 = imagesx($image);
                $dx2 = $dx1 + imagesx($image);
            } else {
                $sx2 = $x2;
                $dx2 = imagesx($tmpImage);
            }
            if ($y2 - $y1 > imagesy($image)) {
                $sy2 = imagesy($image);
                $dy2 = $dy1 + imagesy($image);
            } else {
                $sy2 = $y2;
                $dy2 = imagesy($tmpImage);

            }

            imagecopyresampled($tmpImage, $image, $dx1, $dy1, $sx1, $sy1, $dx2 - $dx1, $dy2 - $dy1, $sx2 - $sx1, $sy2 - $sy1);
            $image = $tmpImage;

            $sx1 = 0;
            $sy1 = 0;
            $sx2 = imagesx($image);
            $sy2 = imagesy($image);

        } else {
            $sx1 = $x1;
            $sx2 = $x2;
            $sy1 = $y1;
            $sy2 = $y2;
        }

        /**
         * Our $image is required proportions. The only thing we need to do is to scale the image and save.
         */

        $imageNew = imagecreatetruecolor($widthDest, $heightDest);
        imagealphablending($imageNew, false);
        imagesavealpha($imageNew,true);
        $color = imagecolorallocatealpha($imageNew, 255, 255, 255, 127);
        imagefilledrectangle($imageNew, 0, 0, $widthDest, $heightDest, $color);
        imagecopyresampled($imageNew, $image, 0,  0, $sx1, $sy1, $widthDest, $heightDest, $sx2 - $sx1, $sy2 - $sy1);

        return $imageNew;
    }

    private function croppingGoesOutOfImage($sourceFile, $x1, $y1, $x2, $y2)
    {
        $imageInfo = getimagesize(BASE_DIR.$sourceFile);
        $widthSource = $imageInfo[0];
        $heightSource = $imageInfo[1];
        $goesOut = $x2 - $x1 > $widthSource || $y2 - $y1 > $heightSource || $x1 < 0 || $y1 < 0;
        return $goesOut;
    }


    private function resizeRequired($imageFile)
    {
        $imageInfo = getimagesize(BASE_DIR.$imageFile);
        $widthS = $imageInfo[0];
        $heightS = $imageInfo[1];
        $widthT = $this->widthDest;
        $heightT = $this->heightDest;

        $resizeRequired = $widthS != $widthT || $heightS != $heightT;
        $resizeRequired = $resizeRequired || $this->x1 != 0 || $this->x2 != 0 || $this->x2 != $imageInfo[0] || $this->y2 != $imageInfo[1];

        return $resizeRequired;

    }

}
