/**
 * --------------------------------------------------------------------------------
 * PROPRIETARY & CONFIDENTIAL
 * --------------------------------------------------------------------------------
 * Plugin Name: Yokko Ultimate SEO Engine
 * Description: Custom high-performance SEO system (Auto-Title, Auto-Desc, 
 * OG-Tags, Schema, and XML Sitemap).
 * Author:      Yokko
 * Version:     2.5 (Ultimate Protected)
 * Copyright:   (c) 2026 Yokko. All rights reserved.
 * * NOTICE: All information contained herein is the property of Yokko.
 * Unauthorized copying or distribution of this file via any medium is 
 * strictly prohibited.
 * --------------------------------------------------------------------------------
 */

if ( ! class_exists( 'WP_Pro_Custom_SEO' ) ) {

    class WP_Pro_Custom_SEO {

        public function __construct() {
            add_action( 'add_meta_boxes', [ $this, 'add_seo_meta_box' ] );
            add_action( 'save_post', [ $this, 'save_seo_data' ] );
            add_action( 'wp_head', [ $this, 'render_seo_meta_tags' ], 1 );
            add_filter( 'pre_get_document_title', [ $this, 'custom_seo_title' ], 15 );
            add_action( 'init', [ $this, 'register_sitemap_route' ] );
            add_action( 'template_redirect', [ $this, 'render_sitemap' ] );
            add_filter( 'wp_sitemaps_enabled', '__return_false' );
        }

        public function add_seo_meta_box() {
            $screens = [ 'post', 'page' ];
            foreach ( $screens as $screen ) {
                add_meta_box( 'wp_pro_seo_box', 'Pengaturan SEO', [ $this, 'render_meta_box_html' ], $screen, 'advanced', 'high' );
            }
        }

        public function render_meta_box_html( $post ) {
            wp_nonce_field( 'wp_pro_seo_save_data', 'wp_pro_seo_meta_nonce' );
            $seo_title     = get_post_meta( $post->ID, '_pro_seo_title', true );
            $seo_desc      = get_post_meta( $post->ID, '_pro_seo_desc', true );
            $seo_canonical = get_post_meta( $post->ID, '_pro_seo_canonical', true );
            $seo_robots    = get_post_meta( $post->ID, '_pro_seo_robots', true );

            echo '<style>.pro-seo-field { margin-bottom: 15px; } .pro-seo-field label { font-weight: bold; display: block; margin-bottom: 5px; } .pro-seo-field input[type="text"], .pro-seo-field textarea, .pro-seo-field select { width: 100%; max-width: 100%; }</style>';
            echo '<div class="pro-seo-field"><label>SEO Title (Opsional)</label><input type="text" name="pro_seo_title" value="' . esc_attr( $seo_title ) . '" placeholder="Judul Artikel - Nama Website" /></div>';
            echo '<div class="pro-seo-field"><label>Meta Description (Opsional)</label><textarea name="pro_seo_desc" rows="3" placeholder="Kosongkan untuk auto-generate dari isi artikel...">' . esc_textarea( $seo_desc ) . '</textarea></div>';
            echo '<div class="pro-seo-field"><label>Custom Canonical URL</label><input type="url" name="pro_seo_canonical" value="' . esc_url( $seo_canonical ) . '" /></div>';
            echo '<div class="pro-seo-field"><label>Meta Robots</label><select name="pro_seo_robots"><option value="index, follow" ' . selected( $seo_robots, 'index, follow', false ) . '>Index, Follow</option><option value="noindex, follow" ' . selected( $seo_robots, 'noindex, follow', false ) . '>Noindex, Follow</option></select></div>';
        }

        public function save_seo_data( $post_id ) {
            if ( ! isset( $_POST['wp_pro_seo_meta_nonce'] ) || ! wp_verify_nonce( $_POST['wp_pro_seo_meta_nonce'], 'wp_pro_seo_save_data' ) ) return;
            if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
            if ( isset( $_POST['pro_seo_title'] ) ) update_post_meta( $post_id, '_pro_seo_title', sanitize_text_field( $_POST['pro_seo_title'] ) );
            if ( isset( $_POST['pro_seo_desc'] ) ) update_post_meta( $post_id, '_pro_seo_desc', sanitize_textarea_field( $_POST['pro_seo_desc'] ) );
            if ( isset( $_POST['pro_seo_canonical'] ) ) update_post_meta( $post_id, '_pro_seo_canonical', esc_url_raw( $_POST['pro_seo_canonical'] ) );
            if ( isset( $_POST['pro_seo_robots'] ) ) update_post_meta( $post_id, '_pro_seo_robots', sanitize_text_field( $_POST['pro_seo_robots'] ) );
        }

        public function custom_seo_title( $title ) {
            if ( is_singular() ) {
                $custom = get_post_meta( get_the_ID(), '_pro_seo_title', true );
                if ( ! empty( $custom ) ) return $custom;
                return get_the_title() . ' - ' . get_bloginfo( 'name' );
            } elseif ( is_category() || is_tag() ) {
                return single_term_title('', false) . ' - ' . get_bloginfo( 'name' );
            }
            return $title;
        }

        private function generate_auto_description( $post_content ) {
            $text = wp_strip_all_tags( strip_shortcodes( $post_content ) );
            $text = str_replace( [ "\n", "\r", "\t" ], ' ', $text );
            if ( mb_strlen( $text, 'UTF-8' ) > 155 ) $text = mb_substr( $text, 0, 155, 'UTF-8' ) . '...';
            return trim( $text );
        }

        public function render_seo_meta_tags() {
            $seo_desc = '';
            $seo_robots = 'index, follow';
            $canonical_url = '';
            $og_image = '';
            $final_title = '';

            if ( is_singular() ) {
                global $post;
                $seo_title_custom = get_post_meta( $post->ID, '_pro_seo_title', true );
                $seo_desc         = get_post_meta( $post->ID, '_pro_seo_desc', true );
                $seo_robots       = get_post_meta( $post->ID, '_pro_seo_robots', true );
                if ( empty( $seo_desc ) ) $seo_desc = $this->generate_auto_description( $post->post_content );
                $final_title   = ! empty( $seo_title_custom ) ? $seo_title_custom : get_the_title() . ' - ' . get_bloginfo( 'name' );
                $canonical_url = get_permalink();
                $og_image      = has_post_thumbnail() ? get_the_post_thumbnail_url($post->ID, 'large') : '';
            } elseif ( is_category() || is_tag() ) {
                $seo_desc      = term_description();
                $final_title   = single_term_title('', false) . ' - ' . get_bloginfo( 'name' );
                $canonical_url = get_term_link( get_queried_object() );
            } elseif ( is_home() || is_front_page() ) {
                $seo_desc      = get_bloginfo( 'description' );
                $final_title   = get_bloginfo( 'name' ) . ' - ' . $seo_desc;
                $canonical_url = home_url( '/' );
            }

            if ( ! empty( $seo_desc ) ) echo '<meta name="description" content="' . esc_attr( wp_strip_all_tags( $seo_desc ) ) . '" />' . "\n";
            echo '<meta name="robots" content="' . esc_attr( empty( $seo_robots ) ? 'index, follow' : $seo_robots ) . '" />' . "\n";
            remove_action( 'wp_head', 'rel_canonical' );
            echo '<link rel="canonical" href="' . esc_url( $canonical_url ) . '" />' . "\n";
            echo '<meta property="og:title" content="' . esc_attr( $final_title ) . '" />' . "\n";
            if ( ! empty( $og_image ) ) echo '<meta property="og:image" content="' . esc_url( $og_image ) . '" />' . "\n";
        }

        public function register_sitemap_route() {
            add_rewrite_rule( '^sitemap\.xml$', 'index.php?pro_custom_sitemap=1', 'top' );
            add_rewrite_tag( '%pro_custom_sitemap%', '1' );
        }

        public function render_sitemap() {
            if ( get_query_var( 'pro_custom_sitemap' ) ) {
                header( 'Content-Type: application/xml; charset=utf-8' );
                echo '<?xml version="1.0" encoding="UTF-8"?>';
                echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">';
                echo '<url><loc>' . home_url( '/' ) . '</loc><changefreq>daily</changefreq><priority>1.0</priority></url>';
                
                // Sitemap Kategori
                $categories = get_categories();
                foreach ( $categories as $cat ) {
                    echo '<url><loc>' . get_category_link( $cat->term_id ) . '</loc><changefreq>weekly</changefreq><priority>0.7</priority></url>';
                }

                // Sitemap Post & Page
                $query = new WP_Query( [ 'post_type' => ['post', 'page'], 'post_status' => 'publish', 'posts_per_page' => 500 ] );
                while ( $query->have_posts() ) {
                    $query->the_post();
                    if ( strpos( get_post_meta( get_the_ID(), '_pro_seo_robots', true ), 'noindex' ) !== false ) continue;
                    echo '<url><loc>' . get_permalink() . '</loc><lastmod>' . get_the_modified_time( 'c' ) . '</lastmod><changefreq>weekly</changefreq><priority>0.8</priority></url>';
                }
                wp_reset_postdata();
                echo '</urlset>';
                exit;
            }
        }
    }
    new WP_Pro_Custom_SEO();
}