<?php
if ( ! defined( 'ABSPATH' ) ) exit;

class WMW_Admin {

    public function init() {
        add_action( 'admin_menu',           array( $this, 'add_menus' ) );
        add_action( 'admin_enqueue_scripts',array( $this, 'enqueue_scripts' ) );
        add_action( 'add_meta_boxes',       array( $this, 'add_meta_boxes' ) );
        add_action( 'save_post',            array( $this, 'save_meta_boxes' ) );
        add_filter( 'manage_wmw_article_posts_columns',       array( $this, 'article_columns' ) );
        add_action( 'manage_wmw_article_posts_custom_column', array( $this, 'article_column_data' ), 10, 2 );
        add_filter( 'manage_wmw_wiki_posts_columns',          array( $this, 'wiki_columns' ) );
        add_action( 'manage_wmw_wiki_posts_custom_column',    array( $this, 'wiki_column_data' ), 10, 2 );
        add_action( 'admin_notices',        array( $this, 'admin_notices' ) );
    }

    // ── Admin Menu ────────────────────────────────────────────────────────────

    public function add_menus() {
        add_menu_page(
            'WP Multi Wiki',
            'WP Multi Wiki',
            'manage_options',
            'wp-multi-wiki',
            array( $this, 'page_dashboard' ),
            'dashicons-book-alt',
            30
        );

        add_submenu_page( 'wp-multi-wiki', 'Alle Wikis',        'Alle Wikis',        'manage_options', 'wp-multi-wiki',       array( $this, 'page_dashboard' ) );
        add_submenu_page( 'wp-multi-wiki', 'Neues Wiki',        'Neues Wiki',        'manage_options', 'wmw-new-wiki',        array( $this, 'page_new_wiki' ) );
        add_submenu_page( 'wp-multi-wiki', 'Alle Artikel',      'Alle Artikel',      'manage_options', 'wmw-articles',        array( $this, 'page_articles' ) );
        add_submenu_page( 'wp-multi-wiki', 'Neuer Artikel',     'Neuer Artikel',     'manage_options', 'wmw-new-article',     array( $this, 'page_new_article' ) );
        add_submenu_page( 'wp-multi-wiki', 'Kategorien',        'Kategorien',        'manage_options', 'wmw-categories',      array( $this, 'page_categories' ) );
        add_submenu_page( 'wp-multi-wiki', 'Einstellungen',     'Einstellungen',     'manage_options', 'wmw-settings',        array( $this, 'page_settings' ) );
        add_submenu_page( 'wp-multi-wiki', '🐙 Gitea Import',   '🐙 Gitea Import',   'manage_options', 'wmw-gitea-import',    array( $this, 'page_gitea_import' ) );

        // Hidden edit pages
        add_submenu_page( 'wp-multi-wiki', 'Wiki bearbeiten',   '',  'manage_options', 'wmw-edit-wiki',    array( $this, 'page_edit_wiki' ) );
        add_submenu_page( 'wp-multi-wiki', 'Artikel bearbeiten','',  'manage_options', 'wmw-edit-article', array( $this, 'page_edit_article' ) );
    }

    // ── Scripts & Styles ──────────────────────────────────────────────────────

    public function enqueue_scripts( $hook ) {
        if ( strpos( $hook, 'wp-multi-wiki' ) === false && strpos( $hook, 'wmw-' ) === false ) return;

        wp_enqueue_style(
            'wmw-admin',
            WMW_PLUGIN_URL . 'admin/css/wmw-admin.css',
            array(),
            WMW_VERSION
        );
        wp_enqueue_style( 'wp-color-picker' );
        wp_enqueue_script(
            'wmw-admin',
            WMW_PLUGIN_URL . 'admin/js/wmw-admin.js',
            array( 'jquery', 'wp-color-picker' ),
            WMW_VERSION,
            true
        );
        wp_localize_script( 'wmw-admin', 'wmwAdmin', array(
            'ajaxUrl' => admin_url( 'admin-ajax.php' ),
            'nonce'   => wp_create_nonce( 'wmw_admin_nonce' ),
            'confirm_delete' => __( 'Wirklich löschen?', 'wp-multi-wiki' ),
        ) );

        wp_enqueue_editor();
    }

    // ── Meta Boxes ────────────────────────────────────────────────────────────

    public function add_meta_boxes() {
        add_meta_box( 'wmw_wiki_options', 'Wiki-Optionen', array( $this, 'mb_wiki_options' ), 'wmw_wiki', 'side' );
        add_meta_box( 'wmw_article_meta', 'Artikel-Einstellungen', array( $this, 'mb_article_meta' ), 'wmw_article', 'side' );
    }

    public function mb_wiki_options( $post ) {
        wp_nonce_field( 'wmw_save_wiki', 'wmw_wiki_nonce' );
        $icon  = get_post_meta( $post->ID, '_wmw_icon', true ) ?: '📖';
        $color = get_post_meta( $post->ID, '_wmw_color', true ) ?: '#2271b1';
        $ver   = get_post_meta( $post->ID, '_wmw_version', true ) ?: '1.0.0';
        ?>
        <p>
            <label><strong>Icon (Emoji)</strong></label><br>
            <input type="text" name="wmw_icon" value="<?php echo esc_attr( $icon ); ?>" style="width:100%;font-size:20px;">
        </p>
        <p>
            <label><strong>Akzentfarbe</strong></label><br>
            <input type="text" name="wmw_color" value="<?php echo esc_attr( $color ); ?>" class="wmw-color-picker">
        </p>
        <p>
            <label><strong>Plugin-Version</strong></label><br>
            <input type="text" name="wmw_version" value="<?php echo esc_attr( $ver ); ?>" style="width:100%;">
        </p>
        <?php
    }

    public function mb_article_meta( $post ) {
        wp_nonce_field( 'wmw_save_article', 'wmw_article_nonce' );
        $wiki_id  = (int) get_post_meta( $post->ID, '_wmw_wiki_id', true );
        $order    = (int) get_post_meta( $post->ID, '_wmw_order', true );
        $wikis    = wmw_get_wikis();
        ?>
        <p>
            <label><strong>Gehört zu Wiki</strong></label><br>
            <select name="wmw_wiki_id" style="width:100%">
                <option value="">— Kein Wiki —</option>
                <?php foreach ( $wikis as $wiki ) : ?>
                    <option value="<?php echo $wiki->ID; ?>" <?php selected( $wiki_id, $wiki->ID ); ?>>
                        <?php echo esc_html( $wiki->post_title ); ?>
                    </option>
                <?php endforeach; ?>
            </select>
        </p>
        <p>
            <label><strong>Sortierreihenfolge</strong></label><br>
            <input type="number" name="wmw_order" value="<?php echo esc_attr( $order ); ?>" style="width:100%;" min="0">
        </p>
        <?php
    }

    public function save_meta_boxes( $post_id ) {
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) return;
        if ( ! current_user_can( 'edit_post', $post_id ) ) return;

        // Save wiki options
        if ( isset( $_POST['wmw_wiki_nonce'] ) && wp_verify_nonce( $_POST['wmw_wiki_nonce'], 'wmw_save_wiki' ) ) {
            update_post_meta( $post_id, '_wmw_icon',    sanitize_text_field( $_POST['wmw_icon'] ?? '📖' ) );
            update_post_meta( $post_id, '_wmw_color',   sanitize_hex_color( $_POST['wmw_color'] ?? '#2271b1' ) );
            update_post_meta( $post_id, '_wmw_version', sanitize_text_field( $_POST['wmw_version'] ?? '1.0.0' ) );
        }

        // Save article meta
        if ( isset( $_POST['wmw_article_nonce'] ) && wp_verify_nonce( $_POST['wmw_article_nonce'], 'wmw_save_article' ) ) {
            $wiki_id = absint( $_POST['wmw_wiki_id'] ?? 0 );
            update_post_meta( $post_id, '_wmw_wiki_id', $wiki_id );
            update_post_meta( $post_id, '_wmw_order',   absint( $_POST['wmw_order'] ?? 0 ) );

            // Update search index
            $this->update_search_index( $post_id, $wiki_id );
        }
    }

    private function update_search_index( $article_id, $wiki_id ) {
        global $wpdb;
        $post     = get_post( $article_id );
        $keywords = wp_strip_all_tags( $post->post_title . ' ' . $post->post_content . ' ' . $post->post_excerpt );
        $table    = $wpdb->prefix . 'wmw_search_index';
        $wpdb->replace( $table, array(
            'article_id' => $article_id,
            'wiki_id'    => $wiki_id,
            'keywords'   => $keywords,
        ) );
    }

    // ── Column Overrides ─────────────────────────────────────────────────────

    public function article_columns( $columns ) {
        unset( $columns['date'] );
        $columns['wmw_wiki']     = 'Wiki';
        $columns['wmw_category'] = 'Kategorie';
        $columns['date']         = 'Datum';
        return $columns;
    }

    public function article_column_data( $column, $post_id ) {
        if ( 'wmw_wiki' === $column ) {
            $wiki = wmw_get_article_wiki( $post_id );
            echo $wiki ? '<a href="' . admin_url( 'admin.php?page=wmw-edit-wiki&id=' . $wiki->ID ) . '">' . esc_html( $wiki->post_title ) . '</a>' : '—';
        }
        if ( 'wmw_category' === $column ) {
            $terms = get_the_terms( $post_id, 'wmw_category' );
            echo $terms ? implode( ', ', wp_list_pluck( $terms, 'name' ) ) : '—';
        }
    }

    public function wiki_columns( $columns ) {
        unset( $columns['date'] );
        $columns['wmw_articles'] = 'Artikel';
        $columns['wmw_icon']     = 'Icon';
        $columns['wmw_version']  = 'Version';
        $columns['date']         = 'Datum';
        return $columns;
    }

    public function wiki_column_data( $column, $post_id ) {
        if ( 'wmw_articles' === $column ) {
            $count = count( wmw_get_articles( $post_id ) );
            echo '<strong>' . $count . '</strong>';
        }
        if ( 'wmw_icon' === $column ) {
            echo '<span style="font-size:20px">' . wmw_get_wiki_icon( $post_id ) . '</span>';
        }
        if ( 'wmw_version' === $column ) {
            echo esc_html( get_post_meta( $post_id, '_wmw_version', true ) ?: '1.0.0' );
        }
    }

    // ── Admin Notices ─────────────────────────────────────────────────────────

    public function admin_notices() {
        if ( isset( $_GET['wmw_saved'] ) ) {
            echo '<div class="notice notice-success is-dismissible"><p>✅ Gespeichert!</p></div>';
        }
        if ( isset( $_GET['wmw_deleted'] ) ) {
            echo '<div class="notice notice-success is-dismissible"><p>🗑️ Gelöscht!</p></div>';
        }
        if ( isset( $_GET['wmw_error'] ) ) {
            echo '<div class="notice notice-error is-dismissible"><p>❌ Fehler: ' . esc_html( $_GET['wmw_error'] ) . '</p></div>';
        }
    }

    // ── Pages ─────────────────────────────────────────────────────────────────

    public function page_dashboard() {
        $wikis = get_posts( array( 'post_type' => 'wmw_wiki', 'post_status' => 'any', 'posts_per_page' => -1, 'orderby' => 'title', 'order' => 'ASC' ) );
        $total_articles = count( get_posts( array( 'post_type' => 'wmw_article', 'post_status' => 'any', 'posts_per_page' => -1 ) ) );
        include WMW_PLUGIN_DIR . 'templates/admin/dashboard.php';
    }

    public function page_new_wiki() {
        include WMW_PLUGIN_DIR . 'templates/admin/wiki-form.php';
    }

    public function page_edit_wiki() {
        $wiki_id = absint( $_GET['id'] ?? 0 );
        $wiki    = $wiki_id ? get_post( $wiki_id ) : null;
        if ( ! $wiki || $wiki->post_type !== 'wmw_wiki' ) {
            wp_die( 'Wiki nicht gefunden.' );
        }
        include WMW_PLUGIN_DIR . 'templates/admin/wiki-form.php';
    }

    public function page_articles() {
        $wiki_filter = absint( $_GET['wiki_id'] ?? 0 );
        $args = array( 'post_type' => 'wmw_article', 'post_status' => 'any', 'posts_per_page' => 50, 'orderby' => 'title', 'order' => 'ASC' );
        if ( $wiki_filter ) {
            $args['meta_query'] = array( array( 'key' => '_wmw_wiki_id', 'value' => $wiki_filter ) );
        }
        $articles = get_posts( $args );
        $wikis    = wmw_get_wikis();
        include WMW_PLUGIN_DIR . 'templates/admin/article-list.php';
    }

    public function page_new_article() {
        $wiki_id = absint( $_GET['wiki_id'] ?? 0 );
        $wikis   = wmw_get_wikis();
        include WMW_PLUGIN_DIR . 'templates/admin/article-form.php';
    }

    public function page_edit_article() {
        $article_id = absint( $_GET['id'] ?? 0 );
        $article    = $article_id ? get_post( $article_id ) : null;
        if ( ! $article || $article->post_type !== 'wmw_article' ) wp_die( 'Artikel nicht gefunden.' );
        $wikis = wmw_get_wikis();
        include WMW_PLUGIN_DIR . 'templates/admin/article-form.php';
    }

    public function page_categories() {
        include WMW_PLUGIN_DIR . 'templates/admin/categories.php';
    }

    public function page_gitea_import() {
        include WMW_PLUGIN_DIR . 'templates/admin/gitea-importer.php';
    }

    public function page_settings() {

        $saved = false;

        // ── Speichern ────────────────────────────────────────────────────
        if ( isset( $_POST['wmw_settings_nonce'] )
            && wp_verify_nonce( $_POST['wmw_settings_nonce'], 'wmw_save_settings' )
            && current_user_can( 'manage_options' ) ) {

            $settings = array(
                'show_toc'          => isset( $_POST['show_toc'] )         ? 1 : 0,
                'show_breadcrumbs'  => isset( $_POST['show_breadcrumbs'] ) ? 1 : 0,
                'show_related'      => isset( $_POST['show_related'] )     ? 1 : 0,
                'show_search'       => isset( $_POST['show_search'] )      ? 1 : 0,
                'articles_per_page' => absint( $_POST['articles_per_page'] ?? 20 ),
                'sidebar_position'  => sanitize_key( $_POST['sidebar_position'] ?? 'left' ),
                'color_scheme'      => sanitize_key( $_POST['color_scheme'] ?? 'auto' ),
                'custom_css'        => wp_strip_all_tags( $_POST['custom_css'] ?? '' ),
            );

            update_option( 'wmw_settings', $settings );
            $saved = true;
        }

        // ── Seite anzeigen (nach Speichern ODER normalem Aufruf) ─────────
        $settings = get_option( 'wmw_settings', array() );

        // Erfolgsmeldung direkt hier ausgeben, kein Redirect nötig
        if ( $saved ) {
            echo '<div class="notice notice-success is-dismissible"><p>✅ Einstellungen gespeichert!</p></div>';
        }

        include WMW_PLUGIN_DIR . 'templates/admin/settings.php';
    }
}