<?php

/**
 * Title         : Aqua Resizer
 * Description   : Resizes WordPress images on the fly
 * Version       : 1.2.2
 * Author        : Syamil MJ
 * Author URI    : http://aquagraphite.com
 * License       : WTFPL - http://sam.zoy.org/wtfpl/
 * Documentation : https://github.com/sy4mil/Aqua-Resizer/.
 *
 * @param string $url     - (required) must be uploaded using wp media uploader
 * @param int    $width   - (required)
 * @param int    $height  - (optional)
 * @param bool   $crop    - (optional) default to soft crop
 * @param bool   $single  - (optional) returns an array if false
 * @param bool   $upscale - (optional) resizes smaller images
 *
 * @uses  wp_upload_dir()
 * @uses  image_resize_dimensions()
 * @uses  wp_get_image_editor()
 *
 * @return array|string
 */
if (!class_exists('Aq_Resize')) {
    class Aq_Exception extends Exception
    {
    }

    class Aq_Resize
    {
        /**
         * Should an Aq_Exception be thrown on error?
         * If false (default), then the error will just be logged.
         */
        public $throwOnError = false;
        /**
         * The singleton instance.
         */
        private static $__instance;

        /**
         * No initialization allowed.
         */
        private function __construct()
        {
        }

        /**
         * No cloning allowed.
         */
        private function __clone()
        {
        }

        /**
         * For your custom default usage you may want to initialize an Aq_Resize object by yourself and then have own defaults.
         */
        public static function getInstance()
        {
            if (null == self::$instance) {
                self::$instance = new self();
            }

            return self::$instance;
        }

        /**
         * Run, forest.
         *
         * @param mixed      $url
         * @param null|mixed $width
         * @param null|mixed $height
         * @param null|mixed $crop
         * @param mixed      $single
         * @param mixed      $upscale
         */
        public function process($url, $width = null, $height = null, $crop = null, $single = true, $upscale = false)
        {
            try {
                // Validate inputs.
                if (!$url) {
                    throw new Aq_Exception('$url parameter is required');
                }

                if (!$width) {
                    throw new Aq_Exception('$width parameter is required');
                }

                // Caipt'n, ready to hook.
                if (true === $upscale) {
                    add_filter('image_resize_dimensions', [$this, 'aq_upscale'], 10, 6);
                }

                // Define upload path & dir.
                $upload_info = wp_upload_dir();
                $upload_dir = $upload_info['basedir'];
                $upload_url = $upload_info['baseurl'];

                $http_prefix = 'http://';
                $https_prefix = 'https://';
                $relative_prefix = '//'; // The protocol-relative URL

                /* if the $url scheme differs from $upload_url scheme, make them match
                if the schemes differe, images don't show up. */
                if (!strncmp($url, $https_prefix, strlen($https_prefix))) { //if url begins with https:// make $upload_url begin with https:// as well
                    $upload_url = str_replace($http_prefix, $https_prefix, $upload_url);
                } elseif (!strncmp($url, $http_prefix, strlen($http_prefix))) { //if url begins with http:// make $upload_url begin with http:// as well
                    $upload_url = str_replace($https_prefix, $http_prefix, $upload_url);
                } elseif (!strncmp($url, $relative_prefix, strlen($relative_prefix))) { //if url begins with // make $upload_url begin with // as well
                    $upload_url = str_replace([0 => "{$http_prefix}", 1 => "{$https_prefix}"], $relative_prefix, $upload_url);
                }

                // Check if $img_url is local.
                if (false === strpos($url, $upload_url)) {
                    throw new Aq_Exception('图片必须是本地图片: '.$url);
                }

                // Define path of image.
                $rel_path = str_replace($upload_url, '', $url);
                $img_path = $upload_dir.$rel_path;

                // Check if img path exists, and is an image indeed.
                if (!file_exists($img_path) or !getimagesize($img_path)) {
                    throw new Aq_Exception('图片不存在或者不是一个图片文件: '.$img_path);
                }

                // Get image info.
                $info = pathinfo($img_path);
                $ext = $info['extension'];
                list($orig_w, $orig_h) = getimagesize($img_path);

                // Get image size after cropping.
                $dims = image_resize_dimensions($orig_w, $orig_h, $width, $height, $crop);
                $dst_w = $dims[4];
                $dst_h = $dims[5];

                // Return the original image only if it exactly fits the needed measures.
                if (!$dims || (((null === $height && $orig_w == $width) xor (null === $width && $orig_h == $height)) xor ($height == $orig_h && $width == $orig_w))) {
                    $img_url = $url;
                    $dst_w = $orig_w;
                    $dst_h = $orig_h;
                } else {
                    // Use this to check if cropped image already exists, so we can return that instead.
                    $suffix = "{$dst_w}x{$dst_h}";
                    $dst_rel_path = str_replace('.'.$ext, '', $rel_path);
                    $destfilename = "{$upload_dir}{$dst_rel_path}-{$suffix}.{$ext}";

                    if (!$dims || (true == $crop && false == $upscale && ($dst_w < $width || $dst_h < $height))) {
                        // Can't resize, so return false saying that the action to do could not be processed as planned.
                        throw new Aq_Exception('Unable to resize image because image_resize_dimensions() failed');
                    }
                    // Else check if cache exists.
                    if (file_exists($destfilename) && getimagesize($destfilename)) {
                        $img_url = "{$upload_url}{$dst_rel_path}-{$suffix}.{$ext}";
                    }
                    // Else, we resize the image and return the new resized image url.
                    else {
                        $editor = wp_get_image_editor($img_path);

                        if (is_wp_error($editor) || is_wp_error($editor->resize($width, $height, $crop))) {
                            throw new Aq_Exception('Unable to get WP_Image_Editor: '.
                                $editor->get_error_message().' (is GD or ImageMagick installed?)');
                        }

                        $resized_file = $editor->save();

                        if (!is_wp_error($resized_file)) {
                            $resized_rel_path = str_replace($upload_dir, '', $resized_file['path']);
                            $img_url = $upload_url.$resized_rel_path;
                        } else {
                            throw new Aq_Exception('Unable to save resized image file: '.$editor->get_error_message());
                        }
                    }
                }

                // Okay, leave the ship.
                if (true === $upscale) {
                    remove_filter('image_resize_dimensions', [$this, 'aq_upscale']);
                }

                // Return the output.
                if ($single) {
                    // str return.
                    $image = $img_url;
                } else {
                    // array return.
                    $image = [
                        0 => $img_url,
                        1 => $dst_w,
                        2 => $dst_h,
                    ];
                }

                return $image;
            } catch (Aq_Exception $ex) {
                error_log('Aq_Resize.process() error: '.$ex->getMessage());

                if ($this->throwOnError) {
                    // Bubble up exception.
                    throw $ex;
                }
                // Return false, so that this patch is backwards-compatible.
                return false;
            }
        }

        /**
         * Callback to overwrite WP computing of thumbnail measures.
         *
         * @param mixed $default
         * @param mixed $orig_w
         * @param mixed $orig_h
         * @param mixed $dest_w
         * @param mixed $dest_h
         * @param mixed $crop
         */
        public function aq_upscale($default, $orig_w, $orig_h, $dest_w, $dest_h, $crop)
        {
            if (!$crop) {
                return null;
            }
            // Let the wordpress default function handle this.

            // Here is the point we allow to use larger image size than the original one.
            $aspect_ratio = $orig_w / $orig_h;
            $new_w = $dest_w;
            $new_h = $dest_h;

            if (!$new_w) {
                $new_w = intval($new_h * $aspect_ratio);
            }

            if (!$new_h) {
                $new_h = intval($new_w / $aspect_ratio);
            }

            $size_ratio = max($new_w / $orig_w, $new_h / $orig_h);

            $crop_w = round($new_w / $size_ratio);
            $crop_h = round($new_h / $size_ratio);

            $s_x = floor(($orig_w - $crop_w) / 2);
            $s_y = floor(($orig_h - $crop_h) / 2);

            return [0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h];
        }
    }
}

if (!function_exists('aq_resize')) {
    /**
     * This is just a tiny wrapper function for the class above so that there is no
     * need to change any code in your own WP themes. Usage is still the same :).
     *
     * @param mixed      $url
     * @param null|mixed $width
     * @param null|mixed $height
     * @param null|mixed $crop
     * @param mixed      $single
     * @param mixed      $upscale
     */
    function aq_resize($url, $width = null, $height = null, $crop = null, $single = true, $upscale = false)
    {
        // WPML Fix
        if (defined('ICL_SITEPRESS_VERSION')) {
            global $sitepress;
            $url = $sitepress->convert_url($url, $sitepress->get_default_language());
        }
        // WPML Fix

        $aq_resize = Aq_Resize::getInstance();

        return $aq_resize->process($url, $width, $height, $crop, $single, $upscale);
    }
}