<?php
/**
 * @package    jelix
 * @subpackage utils
 *
 * @author      Bastien Jaillot
 * @contributor Dominique Papin, Lepeltier kévin (the author of the original plugin)
 * @contributor geekbay, Brunto, Laurent Jouanneau
 *
 * @copyright   2007-2008 Lepeltier kévin, 2008 Dominique Papin, 2008 Bastien Jaillot, 2009 geekbay, 2010 Brunto, 2011-2024 Laurent Jouanneau
 *
 * @see       http://www.jelix.org
 * @licence    GNU Lesser General Public Licence see LICENCE file or http://www.gnu.org/licenses/lgpl.html
 */

/**
 * Utility class to manipulate image.
 *
 * @package    jelix
 * @subpackage utils
 * @static
 */
class jImageModifier
{
    /**
     * params inducing transforms of source image.
     *
     * @var array
     */
    protected static $transformParams = array('width', 'height', 'maxwidth', 'maxheight', 'zoom', 'alignh',
        'alignv', 'ext', 'quality', 'shadow', 'scolor', 'sopacity', 'sblur',
        'soffset', 'sangle', 'background', 'omo', );

    /**
     * params associated with html equivalent attributes
     * do not induce any transform of source image.
     *
     * @var array
     */
    protected static $attributeParams = array('alt', 'class', 'id', 'style', 'longdesc', 'name', 'ismap', 'usemap',
        'title', 'dir', 'lang', 'onclick', 'ondblclick', 'onmousedown',
        'onmouseup', 'onmouseover', 'onmousemove', 'onmouseout', 'onkeypress',
        'onkeydown', 'onkeyup', 'width', 'height', );

    /**
     * retrieve an image from the combination of a source image and parameters.
     *
     * parameters list
     * some induce transformations, some not
     *
     *
     * class :string
     * id :string
     * alt :string
     * width :uint
     * height :uint
     * maxwidth :uint only with maxheight
     * maxheight :uint only with maxwidth
     * zoom 1-100
     * omo :boolean
     * alignh [left|center|right|:int]
     * alignv [top|center|bottom|:int]
     * ext [png|jpg|gif]
     * quality 0-100 if ext = jpg
     * shadow :boolean
     * soffset :uint
     * sangle :uint
     * sblur :uint
     * sopacity :uint
     * scolor #000000 :string
     * background #000000 :string
     *
     *
     * gif   -> image/gif
     * jpeg  -> image/jpeg
     * jpg   -> image/jpeg
     * jpe   -> image/jpeg
     * xpm   -> image/x-xpixmap
     * xbm   -> image/x-xbitmap
     * wbmp  -> image/vnd.wap.wbmp
     * png   -> image/png
     * other -> image/png
     *
     * @param string $src             the path to the source image, relative to the www directory
     *                                or relative to the path indicated into the configuration.
     *                                The filename should have one of these extensions:
     *                                gif,jpeg,jpg,jpe,xpm,xbm,wbmp,png
     * @param array  $params          parameters specifying image
     * @param array  $send_cache_path include cache path in result
     * @param array  $config          the paths configuration. should contain same parameters
     *                                as you find in the imagemodifier section of the configuration.
     *                                give these array if you want to override the configuration.
     * @param mixed  $sendCachePath
     *
     * @return array list of attributes
     */
    public static function get($src, $params = array(), $sendCachePath = true, $config = null)
    {
        $basePath = jApp::urlBasePath();
        if (strpos($src, $basePath) === 0) {
            // in the case where the path is constructed with $j_basepath or $j_themepath
            // in a template
            $src = substr($src, strlen($basePath));
        }

        // extension
        $ext = self::getExtension($src, $params['ext']??'');

        //// white background for IE
        //if (empty($params['background'])
        //    && strpos($_SERVER["HTTP_USER_AGENT"], 'MSIE') !== false
        //    && strpos($_SERVER["HTTP_USER_AGENT"], 'MSIE 7') === false) {
        //    $params['background'] = '#ffffff';
        //}

        // attributes for the img tag
        $att = array();
        $chaine = $src;
        // parse params
        foreach ($params as $key => $value) {
            if (in_array($key, jImageModifier::$transformParams)) {
                $chaine .= $key.$value;
            }
            if (in_array($key, jImageModifier::$attributeParams)) {
                // attribute params are just transmitted back
                $att[$key] = $value;
            }
        }
        // generate cache key based on image src and transform params
        $cacheName = md5($chaine).'.'.$ext;

        // paths & uri
        list($srcPath, $srcUri, $cachePath, $cacheUri) = self::computeUrlFilePath($config, $src);

        // apply transforms if necessary (serve directly or from cache otherwise)
        $pendingTransforms = ($chaine !== $src);
        if ($pendingTransforms && is_file($srcPath.$src) && !is_file($cachePath.$cacheName)) {
            self::transformImage($srcPath.$src, $cachePath, $cacheName, $params);
        }

        // Attributes
        if (!is_file($cachePath.$cacheName)) {
            // image does not undergo any transformation
            $att['src'] = $srcUri.$src;
            $att['style'] = empty($att['style']) ? '' : $att['style'];
            if (!empty($params['width'])) {
                $att['style'] .= 'width:'.$params['width'].'px;';
            } elseif (!empty($params['maxwidth'])) {
                $att['style'] .= 'width:'.$params['maxwidth'].'px;';
            }
            if (!empty($params['height'])) {
                $att['style'] .= 'height:'.$params['height'].'px;';
            } elseif (!empty($params['maxheight'])) {
                $att['style'] .= 'height:'.$params['maxheight'].'px;';
            }
        } else {
            $att['src'] = $cacheUri.$cacheName;
        }

        if ($sendCachePath) {
            $att['cache_path'] = $cachePath.$cacheName;
        }

        return $att;
    }

    /**
     * compute path from the configuration or from
     * the given array. These paths will be used to read images and to save them
     * into a cache directory.
     *
     * @param null|mixed $config
     * @param null|mixed $src
     *
     * @return array keys are
     *               src_url, src_path, cache_path, cache_url
     */
    public static function computeUrlFilePath($config = null, $src = null)
    {
        // paths & uri
        $basePath = jApp::urlBasePath();

        if (!$config) {
            $config = &jApp::config()->imagemodifier;
        }

        // compute URL and file path of the source image
        if ($config['src_url'] && $config['src_path']) {
            $srcUri = $config['src_url'];
            if ($srcUri[0] != '/' && !preg_match('/^https?\\:\\/\\/$/', $srcUri)) {
                $srcUri = $basePath.$srcUri;
            }
            $srcPath = jFile::parseJelixPath($config['src_path']);
        } elseif (jApp::coord()) {
            $srcUri = jServer::getServerURI().$basePath;
            $srcPath = jApp::wwwPath();
        } else {
            throw new Exception('No router and no src_url in parameters. src_url is missing');
        }

        if ($config['cache_path'] && $config['cache_url']) {
            $cacheUri = $config['cache_url'];
            if ($cacheUri[0] != '/' && !preg_match('/^https?\\:\\/\\/$/', $cacheUri)) {
                $cacheUri = $basePath.$cacheUri;
            }
            $cachePath = jFile::parseJelixPath($config['cache_path']);
        } elseif (jApp::coord()) {
            $cachePath = jApp::wwwPath('cache/images/');
            $cacheUri = jServer::getServerURI().$basePath.'cache/images/';
        } else {
            throw new Exception('No router and no cache_url in parameters. cache_url is missing');
        }

        if ($src && (!isset($config['use_old_cache_path']) || !$config['use_old_cache_path'])) {
            // new cache path. Only generate if there is no old_cache_path config parameter of if it's old
            $cachePath .= $src.'.cache/';
            $cacheUri .= $src.'.cache/';
        }

        return array($srcPath, $srcUri, $cachePath, $cacheUri);
    }

    protected static $mimes = array('gif' => 'image/gif', 'png' => 'image/png',
        'jpeg' => 'image/jpeg', 'jpg' => 'image/jpeg', 'jpe' => 'image/jpeg',
        'xpm' => 'image/x-xpixmap', 'xbm' => 'image/x-xbitmap', 'wbmp' => 'image/vnd.wap.wbmp', );

    /**
     * transform source image file (given parameters) and store the result into an other file.
     *
     * @param string $srcFs      the path to the image to transform. [gif|jpeg|jpg|jpe|xpm|xbm|wbmp|png]
     * @param string $targetPath the path of the directory to store the resulting image
     * @param string $targetName the filename of the resulting image
     * @param array  $params     parameters specifying transformations
     */
    public static function transformImage($srcFs, $targetPath, $targetName, $params)
    {
        $ext = self::getExtension($srcFs);
        if (!$ext || !isset(self::$mimes[$ext])) {
            return false;
        }

        $mimeType = self::$mimes[$ext];

        $quality = (!empty($params['quality'])) ? $params['quality'] : 100;

        // Creating an image
        switch ($mimeType) {
            case 'image/gif':
                $image = imagecreatefromgif($srcFs);

                break;

            case 'image/jpeg':
                $image = imagecreatefromjpeg($srcFs);

                break;

            case 'image/png':
                $image = imagecreatefrompng($srcFs);

                break;

            case 'image/vnd.wap.wbmp':
                $image = imagecreatefromwbmp($srcFs);

                break;

            case 'image/image/x-xbitmap':
                $image = imagecreatefromxbm($srcFs);

                break;

            case 'image/x-xpixmap':
                $image = imagecreatefromxpm($srcFs);

                break;

            default:
                return false;
        }

        if ($image === false) {
            return false;
        }

        if (!empty($params['maxwidth']) && !empty($params['maxheight'])) {
            $origWidth = imagesx($image);
            $origHeight = imagesy($image);
            $constWidth = $params['maxwidth'];
            $constHeight = $params['maxheight'];
            $ratio = imagesx($image) / imagesy($image);

            if ($origWidth < $constWidth && $origHeight < $constHeight) {
                $params['width'] = $origWidth;
                $params['height'] = $origHeight;
            } else {
                $ratioHeight = $constWidth / $ratio;
                $ratioWidth = $constHeight * $ratio;
                if ($ratioWidth > $constWidth) {
                    $constHeight = $ratioHeight;
                } elseif ($ratioHeight > $constHeight) {
                    $constWidth = $ratioWidth;
                }
                $params['width'] = $constWidth;
                $params['height'] = $constHeight;
            }
        }

        if (!empty($params['width']) || !empty($params['height'])) {
            $ancienimage = $image;
            $resampleheight = imagesy($ancienimage);
            $resamplewidth = imagesx($ancienimage);

            if (empty($params['width'])) {
                $finalheight = (int) $params['height'];
                $finalwidth = floor($finalheight * imagesx($ancienimage) / imagesy($ancienimage));
            } elseif (empty($params['height'])) {
                $finalwidth = (int) $params['width'];
                $finalheight = floor($finalwidth * imagesy($ancienimage) / imagesx($ancienimage));
            } else {
                $finalwidth = (int) $params['width'];
                $finalheight = (int) $params['height'];
                if (!empty($params['omo']) && $params['omo'] == 'true') {
                    if ($params['width'] >= $params['height']) {
                        $resampleheight = floor(($resamplewidth * $params['height']) / $params['width']);
                    } else {
                        $resamplewidth = floor(($resampleheight * $params['width']) / $params['height']);
                    }
                }
            }

            if (!empty($params['zoom'])) {
                $resampleheight /= 100 / $params['zoom'];
                $resamplewidth /= 100 / $params['zoom'];
            }

            $posx = imagesx($ancienimage) / 2 - $resamplewidth / 2;
            $posy = imagesy($ancienimage) / 2 - $resampleheight / 2;

            if (!empty($params['alignh'])) {
                if ($params['alignh'] == 'left') {
                    $posx = 0;
                } elseif ($params['alignh'] == 'right') {
                    $posx = -($resamplewidth - imagesx($ancienimage));
                } elseif ($params['alignh'] != 'center') {
                    $posx = -$params['alignh'];
                }
            }

            if (!empty($params['alignv'])) {
                if ($params['alignv'] == 'top') {
                    $posy = 0;
                } elseif ($params['alignv'] == 'bottom') {
                    $posy = -($resampleheight - imagesy($ancienimage));
                } elseif ($params['alignv'] != 'center') {
                    $posy = -$params['alignv'];
                }
            }

            $image = imagecreatetruecolor($finalwidth, $finalheight);
            imagesavealpha($image, true);
            $tp = imagecolorallocatealpha($image, 0, 0, 0, 127);
            imagecopyresampled($image, $ancienimage, 0, 0, (int) $posx, (int) $posy, imagesx($image), imagesy($image), $resamplewidth, $resampleheight);
            imagefill($image, 0, 0, $tp); // Because of a strange behavior (ticket #1486), we must fill the background AFTER imagecopyresampled
        }

        // The shadow cast adds to the dimension of the image chooses
        if (!empty($params['shadow'])) {
            $image = self::createShadow($image, $params);
        }

        // Background
        if (!empty($params['background'])) {
            $params['background'] = str_replace('#', '', $params['background']);
            $rgb = array(0, 0, 0);
            for ($x = 0; $x < 3; ++$x) {
                $rgb[$x] = hexdec(substr($params['background'], (2 * $x), 2));
            }
            $fond = imagecreatetruecolor(imagesx($image), imagesy($image));
            imagefill($fond, 0, 0, imagecolorallocate($fond, $rgb[0], $rgb[1], $rgb[2]));
            imagecopy($fond, $image, 0, 0, 0, 0, imagesx($image), imagesy($image));
            $image = $fond;
        }

        $filename = $targetPath.$targetName;
        jFile::createDir(dirname($filename));

        // Register
        switch ($mimeType) {
            case 'image/gif':
                imagegif($image, $filename);

                break;

            case 'image/jpeg':
                imagejpeg($image, $filename, $quality);

                break;

            default:
                imagepng($image, $filename);
        }
        chmod($filename, jApp::config()->chmodFile);

        // Destruction
        @imagedestroy($image);

        return true;
    }

    protected static function getExtension($filename, $priorityExt = '')
    {
        if ($priorityExt == '') {
            $path_parts = pathinfo($filename);
            if (isset($path_parts['extension'])) {
                $ext = strtolower($path_parts['extension']);
            } else {
                $ext = '';
            }
        } else {
            $ext = strtolower($priorityExt);
        }
        return $ext;
    }

    /**
     * create a shadow.
     *
     * @param string $src    the url of image (myapp/www/):string.[gif|jpeg|jpg|jpe|xpm|xbm|wbmp|png]
     * @param array  $params parameters for the url
     * @param mixed  $image
     *
     * @return resource the image with shadow
     */
    protected static function createShadow($image, $params)
    {

        // Default
        $leng = isset($params['soffset']) ? $params['soffset'] : 10;
        $angle = isset($params['sangle']) ? $params['sangle'] : 135;
        $flou = isset($params['sblur']) ? $params['sblur'] : 10;
        $opac = isset($params['sopacity']) ? $params['sopacity'] : 20;
        $color = isset($params['scolor']) ? $params['scolor'] : '#000000';

        // Color of the shadow
        $color = str_replace('#', '', $color);
        $rgb = array(0, 0, 0);
        if (strlen($color) == 6) {
            for ($x = 0; $x < 3; ++$x) {
                $rgb[$x] = hexdec(substr($color, (2 * $x), 2));
            }
        } elseif (strlen($color) == 3) {
            for ($x = 0; $x < 3; ++$x) {
                $rgb[$x] = hexdec(substr($color, (2 * $x), 1));
            }
        }

        // Gaussian blur parameter
        $coeffs = array(array(1),
            array(1, 1),
            array(1, 2, 1),
            array(1, 3, 3, 1),
            array(1, 4, 6, 4, 1),
            array(1, 5, 10, 10, 5, 1),
            array(1, 6, 15, 20, 15, 6, 1),
            array(1, 7, 21, 35, 35, 21, 7, 1),
            array(1, 8, 28, 56, 70, 56, 28, 8, 1),
            array(1, 9, 36, 84, 126, 126, 84, 36, 9, 1),
            array(1, 10, 45, 120, 210, 252, 210, 120, 45, 10, 1),
            array(1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1), );
        $sum = pow(2, $flou);
        $demi = $flou / 2;

        // Horizontal blur and blur margin
        $temp1 = imagecreatetruecolor(imagesx($image) + $flou, imagesy($image) + $flou);
        imagesavealpha($temp1, true);
        $tp = imagecolorallocatealpha($temp1, 0, 0, 0, 127);
        imagefill($temp1, 0, 0, $tp);

        for ($i = 0; $i < imagesx($temp1); ++$i) {
            for ($j = 0; $j < imagesy($temp1); ++$j) {
                $ig = $i - $demi;
                $jg = $j - $demi;
                $suma = 0;
                for ($k = 0; $k <= $flou; ++$k) {
                    $ik = $ig - $demi + $k;
                    if ($jg < 0 || $jg > imagesy($temp1) - $flou - 1) {
                        $alpha = 127;
                    } elseif ($ik < 0 || $ik > imagesx($temp1) - $flou - 1) {
                        $alpha = 127;
                    } else {
                        $alpha = (imagecolorat($image, $ik, $jg) & 0x7F000000) >> 24;
                    }
                    $suma += $alpha * $coeffs[$flou][$k];
                }
                $c = imagecolorallocatealpha($temp1, 0, 0, 0, $suma / $sum);
                imagesetpixel($temp1, $i, $j, $c);
            }
        }

        // Vertical blur, a shift of the angle, opacity and color

        $x = cos(deg2rad($angle)) * $leng;
        $y = sin(deg2rad($angle)) * $leng;

        $temp2 = imagecreatetruecolor(imagesx($temp1) + abs($x), imagesy($temp1) + abs($y));
        imagesavealpha($temp2, true);
        $tp = imagecolorallocatealpha($temp2, 0, 0, 0, 127);
        imagefill($temp2, 0, 0, $tp);

        $x1 = $x < 0 ? 0 : $x;
        $y1 = $y < 0 ? 0 : $y;

        for ($i = 0; $i < imagesx($temp1); ++$i) {
            for ($j = 0; $j < imagesy($temp1); ++$j) {
                $suma = 0;
                for ($k = 0; $k <= $flou; ++$k) {
                    $jk = $j - $demi + $k;
                    if ($jk < 0 || $jk > imagesy($temp1) - 1) {
                        $alpha = 127;
                    } else {
                        $alpha = (imagecolorat($temp1, $i, $jk) & 0x7F000000) >> 24;
                    }
                    $suma += $alpha * $coeffs[$flou][$k];
                }
                $alpha = 127 - ((127 - ($suma / $sum)) / (100 / $opac));
                $c = imagecolorallocatealpha(
                    $temp2,
                    $rgb[0],
                    $rgb[1],
                    $rgb[2],
                    $alpha < 0 ? 0 : ($alpha > 127 ? 127 : $alpha)
                );
                imagesetpixel($temp2, $i + $x1, $j + $y1, $c);
            }
        }
        imagedestroy($temp1);

        // Merge of the image and are shade
        $x = $x > 0 ? 0 : $x;
        $y = $y > 0 ? 0 : $y;
        imagecopy($temp2, $image, $demi - $x, $demi - $y, 0, 0, imagesx($image), imagesy($image));

        return $temp2;
    }
}
