/*
Plugin Name: Protección IA Content Booster 2.3
Plugin URI: https://thenext.social/
Description: Optimiza tu contenido para ser fuente de IA y voz, mejora visibilidad y estructura semántica automáticamente.
Version: 2.3
Author: Tu Nombre
Author URI: https://thenext.social/
License: GPL2
*/

// (1) Agregar esquema Article y FAQPage con respuestas reales multilinea
add_action('wp_head', function() {
    if (is_single()) {
        global $post;
        $author_name = get_the_author_meta('display_name', $post->post_author);
        $post_title = get_the_title($post);
        $post_url = get_permalink($post);
        $post_date = get_the_date('c', $post);
        $modified_date = get_the_modified_date('c', $post);
        $site_name = get_bloginfo('name');
        $logo_url = get_site_icon_url();

        $schema = [
            "@context" => "https://schema.org",
            "@type" => "Article",
            "headline" => $post_title,
            "datePublished" => $post_date,
            "dateModified" => $modified_date,
            "author" => ["@type" => "Person", "name" => $author_name],
            "publisher" => [
                "@type" => "Organization",
                "name" => $site_name,
                "logo" => ["@type" => "ImageObject", "url" => $logo_url]
            ],
            "mainEntityOfPage" => ["@type" => "WebPage", "@id" => $post_url]
        ];

        echo '<script type="application/ld+json">' . json_encode($schema, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT) . '</script>';

        $content = wp_strip_all_tags($post->post_content);
        preg_match_all('/(?:¿)?(.*?)[?]/', $content, $questions);

        if (!empty($questions[1])) {
            $faq = ["@context" => "https://schema.org", "@type" => "FAQPage", "mainEntity" => []];

            foreach ($questions[1] as $q) {
                $pregunta_regex = '/¿' . preg_quote($q, '/') . '\?/'u;
                if (preg_match($pregunta_regex, $content, $match, PREG_OFFSET_CAPTURE)) {
                    $inicio = $match[0][1] + strlen($match[0][0]);
                    $resto = substr($content, $inicio);
                    $fin = preg_match('/\n\s*\n|¿.*?\?/', $resto, $mfin, PREG_OFFSET_CAPTURE) ? $mfin[0][1] : strlen($resto);
                    $respuesta = trim(substr($resto, 0, $fin));
                } else {
                    $respuesta = 'Consulta la respuesta completa en el artículo.';
                }

                $faq["mainEntity"][] = [
                    "@type" => "Question",
                    "name" => "¿" . trim($q) . "?",
                    "acceptedAnswer" => ["@type" => "Answer", "text" => $respuesta]
                ];
            }

            echo '<script type="application/ld+json">' . json_encode($faq, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT) . '</script>';
        }
    }
});

// (2) Mostrar sugerencias dinámicas por preguntas
add_filter('the_content', function($content) {
    if (!is_single()) return $content;
    global $post;
    $post_content = wp_strip_all_tags($post->post_content);
    preg_match_all('/(?:¿)?(.*?)[?]/', $post_content, $questions);

    $bloque_total = '';

    if (!empty($questions[1])) {
        foreach ($questions[1] as $pregunta_base) {
            if (strlen($pregunta_base) < 10) continue;
            $args = ['post_type' => 'post', 'posts_per_page' => 3, 'post__not_in' => [$post->ID], 's' => $pregunta_base];
            $query = new WP_Query($args);
            if ($query->have_posts()) {
                $bloque = '<div class="relacionados-ai"><h3>¿Te interesa saber más sobre: ' . esc_html($pregunta_base) . '?</h3><ul>';
                while ($query->have_posts()) {
                    $query->the_post();
                    $bloque .= '<li><a href="' . get_permalink() . '">' . get_the_title() . '</a></li>';
                }
                $bloque .= '</ul></div>';
                wp_reset_postdata();
                $bloque_total .= $bloque;
            }
        }
    }
    return $content . $bloque_total;
}, 30);

// (3) Escáner y etiquetas IA desde cero con barra de progreso
add_action('admin_menu', function() {
    add_submenu_page('tools.php', 'Escanear Posts Antiguos IA', 'Escanear Posts IA', 'manage_options', 'escanear-posts-ia', 'escanear_posts_ia_page');
});

function escanear_posts_ia_page() {
    if (!current_user_can('manage_options')) return;

    if (isset($_POST['escanear_posts_ia'])) {
        global $wpdb;
        $wpdb->query("DELETE FROM {$wpdb->term_relationships} WHERE term_taxonomy_id IN (SELECT term_taxonomy_id FROM {$wpdb->term_taxonomy} WHERE taxonomy = 'post_tag')");

        $args = ['post_type' => 'post', 'post_status' => 'publish', 'posts_per_page' => -1];
        $query = new WP_Query($args);
        $total = $query->found_posts;
        $procesados = $etiquetas_creadas = $posts_actualizados = 0;

        if ($query->have_posts()) {
            echo '<div class="wrap"><h2>Procesando publicaciones...</h2><div id="progress" style="width:100%;background:#ccc;"><div id="bar" style="width:0;height:20px;background:#4caf50;"></div></div><script>let total=' . $total . ';let bar=document.getElementById("bar");</script>';

            while ($query->have_posts()) {
                $query->the_post();
                $post_id = get_the_ID();
                $content = wp_strip_all_tags(get_post_field('post_content', $post_id));
                $conceptos = [];

                if (preg_match_all('/(?:¿)?(.*?)[?]/', $content, $matches)) {
                    foreach ($matches[1] as $pregunta) {
                        $pregunta = trim($pregunta);
                        if (strlen($pregunta) >= 10 && strlen($pregunta) <= 100) {
                            $conceptos[] = $pregunta;
                        }
                    }
                }

                $conceptos = array_unique($conceptos);
                $conceptos = array_slice($conceptos, 0, 5);
                $nuevas_etiquetas = [];

                foreach ($conceptos as $concepto) {
                    $term = term_exists($concepto, 'post_tag');
                    if (!$term) {
                        $new_term = wp_insert_term($concepto, 'post_tag');
                        if (!is_wp_error($new_term)) $etiquetas_creadas++;
                    }
                    $nuevas_etiquetas[] = $concepto;
                }

                if (!empty($nuevas_etiquetas)) {
                    wp_set_post_terms($post_id, $nuevas_etiquetas, 'post_tag', true);
                    $posts_actualizados++;
                }

                $procesados++;
                echo '<script>bar.style.width = ((100 * ' . $procesados . ') / total) + "%";</script>';
                flush();
            }
            wp_reset_postdata();
            echo '</div>';
        }

        echo '<div class="notice notice-success is-dismissible"><p><strong>✅ Escaneo completo.</strong><br>Posts procesados: ' . $procesados . '<br>Etiquetas nuevas creadas: ' . $etiquetas_creadas . '<br>Posts actualizados: ' . $posts_actualizados . '</p></div>';
    }

    echo '<div class="wrap"><h1>Escanear Posts Antiguos IA</h1><p>Haz clic para reiniciar y etiquetar publicaciones a partir de preguntas detectadas.</p><form method="post"><input type="submit" name="escanear_posts_ia" class="button button-primary" value="➤ Escanear Ahora"></form></div>';
}

// 4. Exportar resultados a CSV y JSON
function exportar_ia_tags_a_csv_y_json() {
    if (!current_user_can('manage_options')) return;

    $args = ['post_type' => 'post', 'post_status' => 'publish', 'posts_per_page' => -1];
    $query = new WP_Query($args);
    $data = [];

    if ($query->have_posts()) {
        while ($query->have_posts()) {
            $query->the_post();
            $post_id = get_the_ID();
            $tags = wp_get_post_tags($post_id, ['fields' => 'names']);
            if (!empty($tags)) {
                $data[] = [
                    'id' => $post_id,
                    'title' => get_the_title(),
                    'url' => get_permalink(),
                    'tags' => implode('; ', $tags)
                ];
            }
        }
        wp_reset_postdata();
    }

    $upload_dir = wp_upload_dir();
    $csv_file = $upload_dir['basedir'] . '/ia-tags.csv';
    $json_file = $upload_dir['basedir'] . '/ia-tags.json';

    $csv = fopen($csv_file, 'w');
    fputcsv($csv, ['ID', 'Título', 'URL', 'Etiquetas']);
    foreach ($data as $row) fputcsv($csv, $row);
    fclose($csv);

    file_put_contents($json_file, json_encode($data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE));

    echo '<div class="notice notice-success is-dismissible"><p><strong>✅ Exportación completa.</strong><br>
        <a href="' . $upload_dir['baseurl'] . '/ia-tags.csv" target="_blank">Descargar CSV</a> | 
        <a href="' . $upload_dir['baseurl'] . '/ia-tags.json" target="_blank">Descargar JSON</a></p></div>';
}

add_action('admin_menu', function() {
    add_submenu_page('tools.php', 'Exportar Etiquetas IA', 'Exportar Etiquetas IA', 'manage_options', 'exportar-etiquetas-ia', 'exportar_ia_tags_a_csv_y_json');
});