<?php
/**
 * Augmentation to the $_SERVER['DOCUMENT_ROOT'] functionality, because it cannot be relied on to provide the right path
 * in cases where there is URL rewriting at play.
 *
 * @param  $path
 * @return mixed|string
 */
function blackbird_document_root($path) {
    // If the file exists under DOCUMENT_ROOT, return DOCUMENT_ROOT
    if (@file_exists($_SERVER['DOCUMENT_ROOT'] . '/' . $path)) {
        return $_SERVER['DOCUMENT_ROOT'];
    }
    // Get the path of the current script, then compare it with DOCUMENT_ROOT. Then check for the file in each folder.
    $parts = array_diff(explode('/', $_SERVER['SCRIPT_FILENAME']), explode('/', $_SERVER['DOCUMENT_ROOT']));
    $new_path = $_SERVER['DOCUMENT_ROOT'];
    foreach ($parts as $part) {
        $new_path .= '/' . $part;
        if (@file_exists($new_path . '/' . $path)) {
            return $new_path;
        }
    }
    // Microsoft Servers
    if (!isset($_SERVER['DOCUMENT_ROOT'])) {
        $new_path = str_replace("/", "\\", $_SERVER['ORIG_PATH_INFO']);
        $new_path = str_replace($new_path, "", $_SERVER['SCRIPT_FILENAME']);
        if (@file_exists($new_path . '/' . $path)) {
            return $new_path;
        }
    }
    return false;
}
/**
 * This function resizes images It takes image source,
 * width height and quality as a parameter
 * This function is based on the approach described by
 * Victor Teixeira here: http://core.trac.wordpress.org/ticket/15311.
 * @param  $img_url
 * @param  $width
 * @param  $height
 * @param bool $crop
 * @param  $quality
 * @return array with image URL, width and height
 */
function blackbird_image_resize($img_url, $width, $height, $crop = true, $quality = 100) {
    $upload_dir = wp_upload_dir();
    // This used to be the directory for the image cache prior to 3.7.2, so we will leave it that way...
    $upload_path = $upload_dir['basedir'] . '/thumb-cache';
    if (!file_exists($upload_path)) { // Create the directory if it is missing
        wp_mkdir_p($upload_path);
    }
    $file_path = parse_url($img_url);
    if ($_SERVER['HTTP_HOST'] != $file_path['host'] && $file_path['host'] != '') {  // The image is not locally hosted
        $remote_file_info = pathinfo($file_path['path']); // Can't use $img_url as the parameter because pathinfo includes the 'query' for the URL
        if (isset($remote_file_info['extension'])) {
            $remote_file_extension = $remote_file_info['extension'];
        } else {
            $remote_file_extension = 'jpg';
        }
        $remote_file_extension = strtolower($remote_file_extension); // Not doing this creates multiple copies of a remote image.
        $file_base = md5($img_url) . '.' . $remote_file_extension;
        // We will try to copy the file over locally. Otherwise WP's native image_resize() breaks down.
        $copy_to_file = $upload_dir['path'] . '/' . $file_base;
        if (!file_exists($copy_to_file)) {
            $unique_filename = wp_unique_filename($upload_dir['path'], $file_base);
            // Using the HTTP API instead of our own CURL calls...
            $remote_content = wp_remote_request($img_url, array('sslverify' => false)); // Setting the sslverify argument, to prevent errors on HTTPS calls. A user embedding images in a post knows where he is pulling them from
            if (is_wp_error($remote_content)) {
                $copy_to_file = '';
            } else {
                // Not using file open functions, so you have to find your way around by using wp_upload_bits...
                wp_upload_bits($unique_filename, null, $remote_content['body']);
                $copy_to_file = $upload_dir['path'] . '/' . $unique_filename;
            }
        }
        $file_path = $copy_to_file;
    } else {  // Locally hosted image
        //$file_path = $_SERVER['DOCUMENT_ROOT'] . $file_path['path'];
        $file_path = blackbird_document_root($file_path['path']) . $file_path['path'];
    }
    if (!file_exists($file_path)) {
        $resized_image = array(
            'url' => $img_url,
            'width' => $width,
            'height' => $height
        );
        return $resized_image;
    }
    $orig_size = @getimagesize($file_path);
    $source[0] = $img_url;
    $source[1] = $orig_size[0];
    $source[2] = $orig_size[1];
    $file_info = pathinfo($file_path);
    if (isset($file_info['extension'])) {
        $extension = '.' . $file_info['extension'];
        //Image quality is scaled down in case of PNGs, because PNG image creation uses a different scale for quality.
        if ($extension == '.png' && $quality != null) {
            $quality = floor(0.09 * $quality);
        }
    }
    $crop_str = $crop ? '-crop' : '-nocrop';
    $quality_str = $quality != null ? '-' . $quality : '';
    $cropped_img_path = $upload_path . '/' . $file_info['filename'] . '-' . md5($file_path) . '-' . $width . 'x' . $height . $quality_str . $crop_str . $extension;
    $suffix = md5($file_path) . '-' . $width . 'x' . $height . $quality_str . $crop_str;
    // Checking if the file size is larger than the target size
    // If it is smaller or the same size, stop right here and return
    if ($source[1] > $width || $source[2] > $height) {
        // Source file is larger, check if the resized version already exists (for $crop = true but will also work for $crop = false if the sizes match)
        if (file_exists($cropped_img_path)) {
            $cropped_img_url = str_replace($upload_dir['basedir'], $upload_dir['baseurl'], $cropped_img_path);
            $resized_image = array(
                'url' => $cropped_img_url,
                'width' => $width,
                'height' => $height
            );
            return $resized_image;
        }
        if ($crop == false) {
            // Calculate the size proportionally
            $proportional_size = wp_constrain_dimensions($source[1], $source[2], $width, $height);
            $resized_img_path = $upload_path . '/' . $file_info['filename'] . '-' . md5($file_path) . '-' . $proportional_size[0] . 'x' . $proportional_size[1] . $quality_str . $crop_str . $extension;
            $suffix = md5($file_path) . '-' . $proportional_size[0] . 'x' . $proportional_size[1] . $quality_str . $crop_str;
            // Checking if the file already exists
            if (file_exists($resized_img_path)) {
                $resized_img_url = str_replace($upload_dir['basedir'], $upload_dir['baseurl'], $resized_img_path);
                $resized_image = array(
                    'url' => $resized_img_url,
                    'width' => $proportional_size[0],
                    'height' => $proportional_size[1]
                );
                return $resized_image;
            }
        }
        // No cache files - let's finally resize it using WP's inbuilt resizer
        $new_img_path = image_resize($file_path, $width, $height, $crop, $suffix, $upload_path, $quality);
        if (is_wp_error($new_img_path)) {
            // We hit some errors. Let's just return the original image
            $resized_image = array(
                'url' => $source[0],
                'width' => $source[1],
                'height' => $source[2]
            );
        } else {
            $new_img_size = getimagesize($new_img_path);
            $new_img = str_replace($upload_dir['basedir'], $upload_dir['baseurl'], $new_img_path);
            // resized output
            $resized_image = array(
                'url' => $new_img,
                'width' => $new_img_size[0],
                'height' => $new_img_size[1]
            );
        }
        return $resized_image;
    }
    // default output - without resizing
    $resized_image = array(
        'url' => $source[0],
        'width' => $source[1],
        'height' => $source[2]
    );
    return $resized_image;
}
/**
 * This function gets attachment id and resizes it
 * @param type $attach_id
 * @param type $img_url
 * @param type $width
 * @param type $height
 * @param type $crop
 * @param type $jpeg_quality
 * @return type 
 */
function blackbird_thumbnail_resize($attach_id = null, $img_url = null, $width, $height, $crop = false, $jpeg_quality = 90) {
    // this is an attachment, so we have the ID
    if ($attach_id) {
        $image_src = wp_get_attachment_image_src($attach_id, 'full');
        $file_path = get_attached_file($attach_id);
        // this is not an attachment, let's use the image url
    } else if ($img_url) {
        $file_path = parse_url($img_url);
        $file_path = ltrim($file_path['path'], '/');
        $file_path = rtrim(ABSPATH, '/') . $file_path['path'];
        $orig_size = getimagesize($file_path);
        $image_src[0] = $img_url;
        $image_src[1] = $orig_size[0];
        $image_src[2] = $orig_size[1];
    }
    $file_info = pathinfo($file_path);
    $extension = '.' . $file_info['extension'];
    // the image path without the extension
    $no_ext_path = $file_info['dirname'] . '/' . $file_info['filename'];
    $cropped_img_path = $no_ext_path . '-' . $width . 'x' . $height . $extension;
    // checking if the file size is larger than the target size
    // if it is smaller or the same size, stop right here and return
    if ($image_src[1] > $width || $image_src[2] > $height) {
        // the file is larger, check if the resized version already exists (for crop = true but will also work for crop = false if the sizes match)
        if (file_exists($cropped_img_path)) {
            $cropped_img_url = str_replace(basename($image_src[0]), basename($cropped_img_path), $image_src[0]);
            $vt_image = array(
                'url' => $cropped_img_url,
                'width' => $width,
                'height' => $height
            );
            return $vt_image;
        }
        // crop = false
        if ($crop == false) {
            // calculate the size proportionaly
            $proportional_size = wp_constrain_dimensions($image_src[1], $image_src[2], $width, $height);
            $resized_img_path = $no_ext_path . '-' . $proportional_size[0] . 'x' . $proportional_size[1] . $extension;
            // checking if the file already exists
            if (file_exists($resized_img_path)) {
                $resized_img_url = str_replace(basename($image_src[0]), basename($resized_img_path), $image_src[0]);
                $vt_image = array(
                    'url' => $resized_img_url,
                    'width' => $proportional_size[0],
                    'height' => $proportional_size[1]
                );
                return $vt_image;
            }
        }
        // no cached files - let's finally resize it
        $new_img_path = image_resize($file_path, $width, $height, $crop, $jpeg_quality);
        $new_img_size = getimagesize($new_img_path);
        $new_img = str_replace(basename($image_src[0]), basename($new_img_path), $image_src[0]);
        // resized output
        $vt_image = array(
            'url' => $new_img,
            'width' => $new_img_size[0],
            'height' => $new_img_size[1]
        );
        return $vt_image;
    }
    // default output - without resizing
    $vt_image = array(
        'url' => $image_src[0],
        'width' => $image_src[1],
        'height' => $image_src[2]
    );
    return $vt_image;
}
?>