<?php
/**
 * Plugin Name: ROI APU Search
 * Plugin URI: https://analisisdepreciosunitarios.com
 * Description: Motor de busqueda ultra-rapido para Analisis de Precios Unitarios con PDO persistente y scoring hibrido.
 * Version: 1.3.0
 * Author: ROI Theme
 * Author URI: https://analisisdepreciosunitarios.com
 * Text Domain: roi-apu-search
 * Domain Path: /languages
 * Requires at least: 6.0
 * Requires PHP: 8.0
 *
 * @package ROI_APU_Search
 */

declare(strict_types=1);

// Prevent direct access
if (!defined('ABSPATH')) {
    exit;
}

// Plugin constants
define('ROI_APU_SEARCH_VERSION', '1.3.0');
define('ROI_APU_SEARCH_PLUGIN_DIR', plugin_dir_path(__FILE__));
define('ROI_APU_SEARCH_PLUGIN_URL', plugin_dir_url(__FILE__));
define('ROI_APU_SEARCH_PLUGIN_BASENAME', plugin_basename(__FILE__));

/**
 * Main plugin class
 */
final class ROI_APU_Search_Plugin
{
    private static ?self $instance = null;

    /**
     * Get singleton instance
     */
    public static function get_instance(): self
    {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    /**
     * Constructor
     */
    private function __construct()
    {
        $this->load_dependencies();
        $this->init_hooks();
    }

    /**
     * Load required files
     */
    private function load_dependencies(): void
    {
        require_once ROI_APU_SEARCH_PLUGIN_DIR . 'includes/class-db-connection.php';
        require_once ROI_APU_SEARCH_PLUGIN_DIR . 'includes/class-redis-cache.php';
        require_once ROI_APU_SEARCH_PLUGIN_DIR . 'includes/class-search-engine.php';
        require_once ROI_APU_SEARCH_PLUGIN_DIR . 'includes/class-shortcode.php';
        require_once ROI_APU_SEARCH_PLUGIN_DIR . 'includes/class-analytics.php';

        // Admin dashboard
        if (is_admin()) {
            require_once ROI_APU_SEARCH_PLUGIN_DIR . 'admin/class-metrics-repository.php';
            require_once ROI_APU_SEARCH_PLUGIN_DIR . 'admin/class-analytics-dashboard.php';
        }
    }

    /**
     * Initialize WordPress hooks
     */
    private function init_hooks(): void
    {
        // Register shortcode
        add_action('init', [$this, 'register_shortcode']);

        // Enqueue assets
        add_action('wp_enqueue_scripts', [$this, 'enqueue_assets']);

        // AJAX handlers (for non-SHORTINIT fallback)
        add_action('wp_ajax_roi_apu_search', [$this, 'handle_ajax_search']);
        add_action('wp_ajax_nopriv_roi_apu_search', [$this, 'handle_ajax_search']);

        // Initialize admin dashboard
        if (is_admin()) {
            ROI_APU_Analytics_Dashboard::get_instance()->init();
        }
    }

    /**
     * Register the shortcode
     */
    public function register_shortcode(): void
    {
        $shortcode = new ROI_APU_Search_Shortcode();
        add_shortcode('roi_apu_search', [$shortcode, 'render']);
    }

    /**
     * Enqueue frontend assets
     */
    public function enqueue_assets(): void
    {
        // Only load if shortcode is used
        global $post;
        if (!$post || !has_shortcode($post->post_content, 'roi_apu_search')) {
            return;
        }

        wp_enqueue_style(
            'roi-apu-search',
            ROI_APU_SEARCH_PLUGIN_URL . 'assets/css/search-ui.css',
            [],
            ROI_APU_SEARCH_VERSION
        );

        wp_enqueue_script(
            'roi-apu-search',
            ROI_APU_SEARCH_PLUGIN_URL . 'assets/js/search-handler.js',
            [],
            ROI_APU_SEARCH_VERSION,
            true
        );

        // Obtener configuracion de AdSense del tema (si existe)
        // Verifica que la funcion exista para evitar errores si se usa otro tema
        $adsConfig = function_exists('roi_get_adsense_search_config')
            ? roi_get_adsense_search_config()
            : ['enabled' => false];

        // Localize script with AJAX URL, nonce, click tracking URL, and ads config
        wp_localize_script('roi-apu-search', 'roiApuSearch', [
            'ajaxUrl' => admin_url('admin-ajax.php'),
            'apiUrl' => ROI_APU_SEARCH_PLUGIN_URL . 'api/search-endpoint.php',
            'clickUrl' => ROI_APU_SEARCH_PLUGIN_URL . 'api/click-endpoint.php',
            'nonce' => wp_create_nonce('roi_apu_search'),
            'ads' => $adsConfig,
        ]);
    }

    /**
     * Handle AJAX search request (fallback if SHORTINIT doesn't work)
     */
    public function handle_ajax_search(): void
    {
        // Verify nonce
        if (!check_ajax_referer('roi_apu_search', 'nonce', false)) {
            wp_send_json_error(['message' => 'Invalid security token'], 403);
        }

        // Store raw term before sanitization
        $term_raw = isset($_POST['term']) ? (string) wp_unslash($_POST['term']) : '';
        $term = sanitize_text_field($term_raw);
        $page = isset($_POST['page']) ? absint($_POST['page']) : 1;
        $per_page = isset($_POST['per_page']) ? absint($_POST['per_page']) : 10;
        $categories = isset($_POST['categories']) ? sanitize_text_field(wp_unslash($_POST['categories'])) : '';

        // Validate term
        $min_len = 3;
        $max_len = 250;

        if (mb_strlen($term, 'UTF-8') < $min_len) {
            wp_send_json_error(['message' => "Minimo {$min_len} caracteres"], 400);
        }

        if (mb_strlen($term, 'UTF-8') > $max_len) {
            $term = mb_substr($term, 0, $max_len, 'UTF-8');
        }

        // Execute search
        try {
            $db = ROI_APU_Search_DB::get_instance();
            $pdo = $db->get_pdo();
            $prefix = $db->get_prefix();

            $search = new ROI_APU_Search_Engine($pdo);

            // Parse categories
            $category_ids = [];
            if (!empty($categories)) {
                $category_ids = $this->parse_categories($categories);
            }

            $offset = ($page - 1) * $per_page;
            $results = $search->run($term, $per_page, $offset, $category_ids);

            // Build permalinks for each result (search engine returns empty permalink)
            $site_url = rtrim(home_url(), '/');
            $permalink_structure = get_option('permalink_structure', '/%postname%/');

            foreach ($results['rows'] as &$row) {
                if (empty($row['permalink'])) {
                    $postName = $row['post_name'] ?? '';

                    if (empty($postName)) {
                        $row['permalink'] = $site_url . '/?p=' . $row['ID'];
                        continue;
                    }

                    // Build according to permalink structure
                    if (strpos($permalink_structure, '%post_id%') !== false) {
                        $row['permalink'] = $site_url . '/' . $row['ID'] . '/';
                    } else {
                        $row['permalink'] = $site_url . '/' . $postName . '/';
                    }
                }
            }
            unset($row);

            // Log search for analytics
            $analytics_cfg = ROI_APU_Search_Analytics::get_config();
            $search_id = ROI_APU_Search_Analytics::logSearch(
                $pdo,
                $prefix,
                $analytics_cfg,
                $term_raw,
                $term,
                $results,
                $page,
                $per_page
            );

            // Add search_id to response for click tracking
            $results['search_id'] = $search_id;

            wp_send_json_success($results);
        } catch (\Exception $e) {
            wp_send_json_error(['message' => 'Error en la busqueda'], 500);
        }
    }

    /**
     * Parse categories string to array of IDs
     */
    private function parse_categories(string $categories): array
    {
        $parts = array_filter(array_map('trim', explode(',', $categories)));
        $ids = [];

        foreach ($parts as $part) {
            if (is_numeric($part)) {
                $ids[] = (int) $part;
            } else {
                // Try to get category by slug
                $term = get_term_by('slug', $part, 'category');
                if ($term) {
                    $ids[] = (int) $term->term_id;
                }
            }
        }

        return array_unique($ids);
    }
}

// Initialize plugin
add_action('plugins_loaded', function () {
    ROI_APU_Search_Plugin::get_instance();
});

// Activation hook
register_activation_hook(__FILE__, function () {
    // Check PHP version
    if (version_compare(PHP_VERSION, '8.0', '<')) {
        deactivate_plugins(plugin_basename(__FILE__));
        wp_die('ROI APU Search requiere PHP 8.0 o superior.');
    }

    // Flush rewrite rules
    flush_rewrite_rules();
});

// Deactivation hook
register_deactivation_hook(__FILE__, function () {
    flush_rewrite_rules();
});