<?php
/**
 * Plugin Name: KGV FAQ
 * Description: FAQ-Verwaltung mit Fragen, Antworten, Kategorien, sauberem Backend und Shortcode-Ausgabe.
 * Version: 1.0.4
 * Author: Ronny Grobel
 * Author URI: https://apex-project.de/
 * Plugin URI: https://apex-project.de/
 * Update URI: https://git.apex-project.de/Wordpress_Plugins/KGV-FAQ
 * Gitea Plugin URI: https://git.apex-project.de/Wordpress_Plugins/KGV-FAQ
 * Requires Plugins: KGV-Updater
 */

if (!defined('ABSPATH')) {
    exit;
}

final class KGV_FAQ_Plugin {

    const VERSION = '1.0.4';
    const POST_TYPE = 'kgv_faq';
    const TAXONOMY = 'kgv_faq_cat';

    public function __construct() {
        add_action('init', [$this, 'register_post_type']);
        add_action('init', [$this, 'register_taxonomy']);

        add_action('admin_enqueue_scripts', [$this, 'enqueue_admin_assets']);
        add_action('wp_enqueue_scripts', [$this, 'enqueue_front_assets']);

        add_filter('manage_' . self::POST_TYPE . '_posts_columns', [$this, 'admin_columns']);
        add_action('manage_' . self::POST_TYPE . '_posts_custom_column', [$this, 'admin_column_content'], 10, 2);
        add_filter('manage_edit-' . self::POST_TYPE . '_sortable_columns', [$this, 'sortable_columns']);

        add_shortcode('kgv_faq', [$this, 'faq_shortcode']);

        register_activation_hook(__FILE__, [$this, 'activate']);
        register_deactivation_hook(__FILE__, [$this, 'deactivate']);
    }

    public function activate() {
        $this->register_post_type();
        $this->register_taxonomy();
        flush_rewrite_rules();
    }

    public function deactivate() {
        flush_rewrite_rules();
    }

    public function register_post_type() {
        register_post_type(self::POST_TYPE, [
            'labels' => [
                'name'               => 'FAQ',
                'singular_name'      => 'FAQ',
                'add_new'            => 'Neu hinzufügen',
                'add_new_item'       => 'Neue Frage hinzufügen',
                'edit_item'          => 'Frage bearbeiten',
                'new_item'           => 'Neue Frage',
                'view_item'          => 'Frage ansehen',
                'search_items'       => 'Fragen durchsuchen',
                'not_found'          => 'Keine Fragen gefunden',
                'not_found_in_trash' => 'Keine Fragen im Papierkorb gefunden',
                'menu_name'          => 'FAQ',
            ],
            'public'              => false,
            'publicly_queryable'  => false,
            'exclude_from_search' => true,
            'has_archive'         => false,
            'rewrite'             => false,
            'query_var'           => false,
            'show_ui'             => true,
            'show_in_menu'        => true,
            'show_in_nav_menus'   => false,
            'show_in_admin_bar'   => true,
            'show_in_rest'        => true,
            'menu_icon'           => 'dashicons-editor-help',
            'supports'            => ['title', 'editor', 'excerpt', 'page-attributes'],
        ]);
    }

    public function register_taxonomy() {
        register_taxonomy(self::TAXONOMY, [self::POST_TYPE], [
            'labels' => [
                'name'              => 'FAQ-Kategorien',
                'singular_name'     => 'FAQ-Kategorie',
                'search_items'      => 'Kategorien durchsuchen',
                'all_items'         => 'Alle Kategorien',
                'edit_item'         => 'Kategorie bearbeiten',
                'update_item'       => 'Kategorie aktualisieren',
                'add_new_item'      => 'Neue Kategorie hinzufügen',
                'new_item_name'     => 'Neuer Kategoriename',
                'menu_name'         => 'Kategorien',
            ],
            'public'             => false,
            'publicly_queryable' => false,
            'hierarchical'       => true,
            'show_ui'            => true,
            'show_admin_column'  => true,
            'rewrite'            => false,
            'query_var'          => false,
            'show_in_rest'       => true,
        ]);
    }

    public function enqueue_admin_assets($hook) {
        global $post_type;

        $allowed = ['post.php', 'post-new.php', 'edit.php', 'term.php', 'edit-tags.php'];

        if (!in_array($hook, $allowed, true)) {
            return;
        }

        if ($post_type !== self::POST_TYPE && (!isset($_GET['taxonomy']) || sanitize_key(wp_unslash($_GET['taxonomy'])) !== self::TAXONOMY)) {
            return;
        }

        wp_enqueue_style(
            'kgv-faq-admin',
            plugin_dir_url(__FILE__) . 'assets/admin.css',
            [],
            self::VERSION
        );
    }

    public function enqueue_front_assets() {
        wp_enqueue_style(
            'kgv-faq-front',
            plugin_dir_url(__FILE__) . 'assets/front.css',
            [],
            self::VERSION
        );

        wp_enqueue_script(
            'kgv-faq-front',
            plugin_dir_url(__FILE__) . 'assets/front.js',
            [],
            self::VERSION,
            true
        );
    }

    public function admin_columns($columns) {
        $new_columns = [];

        foreach ($columns as $key => $label) {
            if ($key === 'date') {
                continue;
            }

            $new_columns[$key] = $label;

            if ($key === 'title') {
                $new_columns['kgv_faq_order'] = 'Reihenfolge';
                $new_columns['kgv_faq_answer'] = 'Antwort';
            }
        }

        $new_columns['date'] = 'Datum';

        return $new_columns;
    }

    public function admin_column_content($column, $post_id) {
        if ($column === 'kgv_faq_order') {
            echo (int) get_post_field('menu_order', $post_id);
            return;
        }

        if ($column === 'kgv_faq_answer') {
            $content = get_post_field('post_content', $post_id);
            $text = wp_strip_all_tags($content);
            $text = mb_substr($text, 0, 120);
            echo esc_html($text ? $text . '…' : '—');
        }
    }

    public function sortable_columns($columns) {
        $columns['kgv_faq_order'] = 'menu_order';
        return $columns;
    }

    public function faq_shortcode($atts) {
        $atts = shortcode_atts([
            'category'    => '',
            'limit'       => 100,
            'show_filter' => '1',
            'open_first'  => '0',
            'search'      => '0',
        ], $atts, 'kgv_faq');

        $selected_category = '';

        if (!empty($_GET['faq_cat'])) {
            $selected_category = sanitize_title(wp_unslash($_GET['faq_cat']));
        } elseif (!empty($atts['category'])) {
            $selected_category = sanitize_title($atts['category']);
        }

        $query_args = [
            'post_type'      => self::POST_TYPE,
            'post_status'    => 'publish',
            'posts_per_page' => max(1, (int) $atts['limit']),
            'orderby'        => ['menu_order' => 'ASC', 'title' => 'ASC'],
            'order'          => 'ASC',
        ];

        if ($selected_category) {
            $query_args['tax_query'] = [[
                'taxonomy' => self::TAXONOMY,
                'field'    => 'slug',
                'terms'    => $selected_category,
            ]];
        }

        $faq_query = new WP_Query($query_args);
        $terms = get_terms([
            'taxonomy'   => self::TAXONOMY,
            'hide_empty' => true,
        ]);

        $uid = wp_unique_id('kgv-faq-');
        $open_first = $atts['open_first'] === '1';
        $show_search = $atts['search'] === '1';

        ob_start();

        echo '<div class="kgv-faq-wrapper" data-kgv-faq>';

        if ($atts['show_filter'] === '1' && !is_wp_error($terms) && !empty($terms)) {
            echo '<form class="kgv-faq-filter" method="get">';

            foreach ($_GET as $key => $value) {
                if ($key === 'faq_cat' || is_array($value)) {
                    continue;
                }

                echo '<input type="hidden" name="' . esc_attr($key) . '" value="' . esc_attr(wp_unslash($value)) . '">';
            }

            echo '<label for="' . esc_attr($uid . '-cat') . '"><strong>Kategorie:</strong></label> ';
            echo '<select id="' . esc_attr($uid . '-cat') . '" name="faq_cat" onchange="this.form.submit()">';
            echo '<option value="">Alle Fragen</option>';

            foreach ($terms as $term) {
                echo '<option value="' . esc_attr($term->slug) . '" ' . selected($selected_category, $term->slug, false) . '>';
                echo esc_html($term->name);
                echo '</option>';
            }

            echo '</select>';
            echo '</form>';
        }

        if ($show_search) {
            echo '<div class="kgv-faq-search-wrap">';
            echo '<input type="search" class="kgv-faq-search" placeholder="Frage suchen …" aria-label="Frage suchen" data-kgv-faq-search>';
            echo '</div>';
        }

        if ($faq_query->have_posts()) {
            echo '<div class="kgv-faq-list">';

            $index = 0;

            while ($faq_query->have_posts()) {
                $faq_query->the_post();

                $faq_id = get_the_ID();
                $button_id = $uid . '-button-' . $faq_id;
                $panel_id = $uid . '-panel-' . $faq_id;
                $is_open = $open_first && $index === 0;

                echo '<article class="kgv-faq-item" data-kgv-faq-item>';
                echo '<h3 class="kgv-faq-question">';
                echo '<button type="button" class="kgv-faq-toggle' . ($is_open ? ' is-open' : '') . '" id="' . esc_attr($button_id) . '" aria-expanded="' . ($is_open ? 'true' : 'false') . '" aria-controls="' . esc_attr($panel_id) . '" data-kgv-faq-toggle>';
                echo '<span>' . esc_html(get_the_title()) . '</span>';
                echo '<span class="kgv-faq-icon" aria-hidden="true">+</span>';
                echo '</button>';
                echo '</h3>';

                echo '<div class="kgv-faq-answer' . ($is_open ? ' is-open' : '') . '" id="' . esc_attr($panel_id) . '" role="region" aria-labelledby="' . esc_attr($button_id) . '"' . ($is_open ? '' : ' hidden') . '>';
                echo '<div class="kgv-faq-answer__inner">';
                echo wp_kses_post(wpautop(get_the_content()));
                echo '</div>';
                echo '</div>';

                echo '</article>';

                $index++;
            }

            echo '</div>';
            wp_reset_postdata();
        } else {
            echo '<p>Keine Fragen gefunden.</p>';
        }

        echo '</div>';

        return ob_get_clean();
    }
}

new KGV_FAQ_Plugin();