<?php
/**
 * Plugin Name: Pixlio – Image Editor
 * Description: A private, browser-based image studio with media library integration, layers and image adjustments.
 * Version: 0.1.2
 * Author: ikedajapn
 * Author URI: https://www.patreon.com/cw/IkedaJapanDev
 * License: GPL-2.0-or-later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain: pixlio-image-editor
 * Domain Path: /languages
 * Requires at least: 6.5
 * Requires PHP: 7.4
 */
if (!defined('ABSPATH')) { exit; }
define('PIXLIO_IMAGE_EDITOR_VERSION', '0.1.2');
require_once __DIR__ . '/i18n.php';
require_once __DIR__ . '/settings.php';
function pixlio_image_editor_message($en, $ja) { $strings = pixlio_image_editor_strings(); return $strings['_errors'][$en] ?? (pixlio_image_editor_language() === 'ja' ? $ja : $en); }
function pixlio_image_editor_error($en, $ja, $status = 400) { return new WP_Error('pixlio_image_editor_error', pixlio_image_editor_message($en, $ja), array('status' => $status)); }
add_action('admin_menu', function () {
    add_menu_page('Pixlio – Image Editor', 'Pixlio – Image Editor', 'upload_files', 'pixlio-image-editor', function () {
        if (!current_user_can('upload_files')) { return; }
        echo '<div id="pixlio-image-editor-root"></div>';
    }, 'dashicons-format-image', 100);
});
add_action('admin_enqueue_scripts', function ($hook) {
    if ('toplevel_page_pixlio-image-editor' !== $hook) { return; }
    wp_enqueue_media();
    wp_enqueue_style('pixlio-image-editor', plugins_url('assets/studio.css', __FILE__), array(), PIXLIO_IMAGE_EDITOR_VERSION . '.' . filemtime(__DIR__ . '/assets/studio.css'));
    wp_enqueue_script('pixlio-image-editor-engine', plugins_url('assets/engine.js', __FILE__), array(), PIXLIO_IMAGE_EDITOR_VERSION . '.' . filemtime(__DIR__ . '/assets/engine.js'), true);
    wp_enqueue_script('pixlio-image-editor', plugins_url('assets/studio-controls.js', __FILE__), array('pixlio-image-editor-engine'), PIXLIO_IMAGE_EDITOR_VERSION . '.' . filemtime(__DIR__ . '/assets/studio-controls.js'), true);
    wp_localize_script('pixlio-image-editor', 'PixlioConfig', array(
        'rest' => esc_url_raw(rest_url('pixlio-image-editor/v1/')), 'nonce' => wp_create_nonce('wp_rest'),
        'locale' => pixlio_image_editor_language(), 'strings' => pixlio_image_editor_strings(), 'defaults' => pixlio_image_editor_options(), 
        'maxBytes' => min(wp_max_upload_size(), 20 * MB_IN_BYTES),
    ));
    do_action('pixlio_image_editor_enqueue');
});
add_filter('all_plugins', function ($plugins) {
    $key = plugin_basename(__FILE__);
    if (isset($plugins[$key])) { $plugins[$key]['Description'] = pixlio_image_editor_label('pluginDescription'); }
    return $plugins;
});
function pixlio_image_editor_permission($request) {
    if (!is_user_logged_in() || !current_user_can('upload_files') || !wp_verify_nonce($request->get_header('X-WP-Nonce'), 'wp_rest')) {
        return pixlio_image_editor_error('Your session expired or permission was denied. Reload the page.', 'セッション切れ、または権限がありません。画面を再読み込みしてください。', 403);
    }
    return true;
}
function pixlio_image_editor_attachment($id) {
    return get_post_type($id) === 'attachment' && wp_attachment_is_image($id) && current_user_can('edit_post', $id);
}
function pixlio_image_editor_revision($id) {
    return hash('sha256', (string) get_attached_file($id) . wp_json_encode(wp_get_attachment_metadata($id)) . (string) get_post_meta($id, '_image_studio_revision', true));
}
function pixlio_image_editor_file($id) {
    if (!pixlio_image_editor_attachment($id)) { return pixlio_image_editor_error('Image not found or access denied.', '画像が見つからないか、編集権限がありません。', 403); }
    $attached = get_attached_file($id);
    $path = is_string($attached) && $attached !== '' ? realpath($attached) : false;
    $uploads = wp_upload_dir(); $base = realpath($uploads['basedir']);
    if (!$path || !$base || strpos($path, $base . DIRECTORY_SEPARATOR) !== 0 || !is_file($path) || !is_readable($path)) {
        return pixlio_image_editor_error('This image is not available on local storage. Cloud-only media is not supported yet.', 'ローカルの画像ファイルが見つかりません。外部ストレージのみの画像には未対応です。');
    }
    return $path;
}
function pixlio_image_editor_decode($data, $extra = array()) {
    if (!is_string($data) || strlen($data) > 28 * MB_IN_BYTES || !preg_match('#^data:image/(png|jpeg|webp);base64,([A-Za-z0-9+/=\r\n]+)$#D', $data, $m)) {
        return pixlio_image_editor_error('Invalid image data.', '画像データが不正です。');
    }
    $allowed = array_merge(array('png','jpeg'), $extra);
    if (!in_array($m[1], $allowed, true)) { return pixlio_image_editor_error('Unsupported export format.', 'この書き出し形式には対応していません。'); }
    $bytes = base64_decode($m[2], true);
    if (!$bytes || strlen($bytes) > min(wp_max_upload_size(), 20 * MB_IN_BYTES)) { return pixlio_image_editor_error('Image exceeds the upload size limit.', '画像がアップロード容量の上限を超えています。'); }
    $info = @getimagesizefromstring($bytes);
    if (!$info || $info['mime'] !== 'image/' . $m[1] || $info[0] > 8192 || $info[1] > 8192 || $info[0] * $info[1] > 24000000) {
        return pixlio_image_editor_error('Invalid image or dimensions exceed 8192 px / 24 MP.', '画像が不正、または8192px・2400万画素の上限を超えています。');
    }
    return array('bytes' => $bytes, 'mime' => $info['mime'], 'ext' => $m[1] === 'jpeg' ? 'jpg' : $m[1]);
}
function pixlio_image_editor_write($decoded, $name) {
    require_once ABSPATH . 'wp-admin/includes/file.php';
    $temp = wp_tempnam('pixlio-image-editor');
    if (!$temp || file_put_contents($temp, $decoded['bytes']) !== strlen($decoded['bytes'])) {
        if ($temp) { wp_delete_file($temp); }
        return pixlio_image_editor_error('Unable to write image. Check free disk space.', '画像を書き込めません。空き容量を確認してください。', 500);
    }
    $safe_name = sanitize_file_name($name);
    if ($safe_name === '') { $safe_name = 'pixlio-image'; }
    $file = array('name' => $safe_name . '.' . $decoded['ext'], 'tmp_name' => $temp, 'error' => 0, 'size' => strlen($decoded['bytes']));
    $result = wp_handle_sideload($file, array('test_form' => false, 'mimes' => array('png'=>'image/png','jpg'=>'image/jpeg','webp'=>'image/webp')));
    if (file_exists($temp)) { wp_delete_file($temp); }
    return isset($result['error']) ? pixlio_image_editor_error($result['error'], $result['error'], 500) : $result;
}
function pixlio_image_editor_new_image($decoded, $title) {
    require_once ABSPATH . 'wp-admin/includes/image.php';
    $file = pixlio_image_editor_write($decoded, $title);
    if (is_wp_error($file)) { return $file; }
    $id = wp_insert_attachment(array('post_mime_type'=>$decoded['mime'], 'post_title'=>sanitize_text_field($title), 'post_status'=>'inherit'), $file['file'], 0, true);
    if (is_wp_error($id)) { wp_delete_file($file['file']); return $id; }
    // Preserve the requested export dimensions; WordPress normally scales large uploads.
    $keep_dimensions = function () { return false; };
    add_filter('big_image_size_threshold', $keep_dimensions, 999);
    try { $meta = wp_generate_attachment_metadata($id, $file['file']); }
    finally { remove_filter('big_image_size_threshold', $keep_dimensions, 999); }
    if (empty($meta['width']) || empty($meta['height'])) { wp_delete_attachment($id, true); return pixlio_image_editor_error('Image metadata generation failed.', '画像情報の生成に失敗しました。', 500); }
    // Sub-size generation can already persist the complete metadata. WordPress
    // returns false for an unchanged value as well as for a database failure.
    $metadata_updated = wp_update_attachment_metadata($id, $meta);
    $stored_metadata = wp_get_attachment_metadata($id, true);
    if (false === $metadata_updated && (!is_array($stored_metadata) || $stored_metadata != $meta)) {
        wp_delete_attachment($id, true);
        return pixlio_image_editor_error('Unable to save image metadata.', '画像情報を保存できませんでした。', 500);
    }
    update_post_meta($id, '_image_studio_edited', 1);
    return $id;
}
add_action('rest_api_init', function () {
    register_rest_route('pixlio-image-editor/v1', '/images', array('args'=>array(
        'page'=>array('type'=>'integer','minimum'=>1,'maximum'=>100000,'default'=>1),
        'sort'=>array('type'=>'string','enum'=>array('newest','oldest','title'),'default'=>'newest'),
        'search'=>array('type'=>'string','maxLength'=>200,'default'=>''),
        'edited'=>array('type'=>'string','enum'=>array('','0','1'),'default'=>'')
    ),'methods'=>'GET', 'permission_callback'=>'pixlio_image_editor_permission', 'callback'=>function ($r) {
        $sort = $r->get_param('sort'); $page = max(1, absint($r->get_param('page')));
        if (!is_null($r->get_param('search')) && !is_string($r->get_param('search'))) { return pixlio_image_editor_error('Invalid search.', '検索文字列が不正です。'); }
        $args = array('post_type'=>'attachment', 'post_status'=>'inherit', 'post_mime_type'=>'image', 'posts_per_page'=>24, 'paged'=>$page, 's'=>sanitize_text_field((string)$r->get_param('search')), 'orderby'=>$sort === 'title' ? 'title' : 'date', 'order'=>$sort === 'oldest' || $sort === 'title' ? 'ASC' : 'DESC');
        if (!current_user_can('edit_others_posts')) { $args['author'] = get_current_user_id(); }
        if ($r->get_param('edited')) { $args['meta_key'] = '_image_studio_edited'; $args['meta_value'] = 1; }
        $q = new WP_Query($args); $items = array();
        foreach ($q->posts as $p) {
            if (!pixlio_image_editor_attachment($p->ID)) { continue; }
            $m = wp_get_attachment_metadata($p->ID);
            $items[] = array('id'=>$p->ID, 'title'=>get_the_title($p->ID), 'thumb'=>wp_get_attachment_image_url($p->ID, 'medium'), 'width'=>$m['width'] ?? 0, 'height'=>$m['height'] ?? 0, 'mime'=>$p->post_mime_type, 'edited'=>(bool)get_post_meta($p->ID, '_image_studio_edited', true));
        }
        return array('items'=>$items, 'pages'=>(int)$q->max_num_pages);
    }));
    register_rest_route('pixlio-image-editor/v1', '/image/(?P<id>\d+)', array('methods'=>'GET','permission_callback'=>'pixlio_image_editor_permission','callback'=>function ($r) {
        $id = absint($r['id']); $path = pixlio_image_editor_file($id); if (is_wp_error($path)) { return $path; }
        if (filesize($path) > 20 * MB_IN_BYTES) { return pixlio_image_editor_error('Source image exceeds 20 MB.', '元画像が20MBを超えています。'); }
        $size = wp_getimagesize($path);
        if (!$size || $size[0] > 8192 || $size[1] > 8192 || $size[0] * $size[1] > 24000000) { return pixlio_image_editor_error('Image exceeds 8192 px / 24 MP.', '画像が8192px・2400万画素の上限を超えています。'); }
        $mime = wp_get_image_mime($path);
        if (!in_array($mime, array('image/png','image/jpeg','image/webp','image/gif'), true)) { return pixlio_image_editor_error('Unsupported source image.', 'この画像形式には対応していません。'); }
        $contents = file_get_contents($path);
        if (false === $contents || $contents === '') { return pixlio_image_editor_error('Unable to read image data.', '画像データを読み込めませんでした。', 500); }
        return array('id'=>$id, 'title'=>get_the_title($id), 'data'=>'data:' . $mime . ';base64,' . base64_encode($contents), 'revision'=>pixlio_image_editor_revision($id));
    }));
    register_rest_route('pixlio-image-editor/v1', '/save', array('methods'=>'POST','permission_callback'=>'pixlio_image_editor_permission','callback'=>function ($r) {
        if (!is_string($r->get_param('title')) || strlen($r->get_param('title')) > 1000) { return pixlio_image_editor_error('Invalid image title.', '画像名が不正です。'); }
        $decoded = pixlio_image_editor_decode($r->get_param('image'), apply_filters('pixlio_image_editor_export_formats', array()));
        if (is_wp_error($decoded)) { return $decoded; }
        $id = pixlio_image_editor_new_image($decoded, sanitize_text_field((string)$r->get_param('title')) ?: 'Pixlio – Image Editor');
        if (is_wp_error($id)) { return $id; }
        return array('id'=>$id, 'url'=>wp_get_attachment_url($id), 'revision'=>pixlio_image_editor_revision($id));
    }));
});