AI Search Settings

<?php
/**
 * AI Search Settings Pages
 * 
 * Handles all settings page functionality and form processing
 */

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

class AI_Search_Settings_Pages {
    
    /**
     * @var AI_Search_Service
     */
    private $service_client;
    
    /**
     * Initialize settings pages
     */
    public function __construct() {
        $this->service_client = new AI_Search_Service();
    }
    
    /**
     * Display main settings page with tabs
     */
    public function display_settings_page() {
        // Check if setup wizard should be shown
        if ( isset( $_GET['setup'] ) && $_GET['setup'] === 'wizard' ) {
            $wizard = new AI_Search_Setup_Wizard();
            $wizard->display_wizard_page();
            return;
        }

        $active_tab = isset( $_GET['tab'] ) ? sanitize_text_field( $_GET['tab'] ) : 'general';

        echo '<div class="wrap">';
        echo '<h1>AI Search Settings</h1>';
        
        $this->display_tab_navigation( $active_tab );
        $this->display_tab_content( $active_tab );
        
        echo '</div>';
    }
    
    /**
     * Display tab navigation
     */
    private function display_tab_navigation( $active_tab ) {
        echo '<h2 class="nav-tab-wrapper">';
        echo '<a href="?page=ai-search&tab=general" class="nav-tab ' . ( $active_tab == 'general' ? 'nav-tab-active' : '' ) . '">General Settings</a>';
        echo '<a href="?page=ai-search&tab=embeddings" class="nav-tab ' . ( $active_tab == 'embeddings' ? 'nav-tab-active' : '' ) . '">Generate Embeddings</a>';
        echo '<a href="?page=ai-search&tab=custom-fields" class="nav-tab ' . ( $active_tab == 'custom-fields' ? 'nav-tab-active' : '' ) . '">Custom Fields</a>';
        
        // Add WooCommerce tab if WooCommerce is active
        if ( class_exists( 'WooCommerce' ) ) {
            echo '<a href="?page=ai-search&tab=woocommerce" class="nav-tab ' . ( $active_tab == 'woocommerce' ? 'nav-tab-active' : '' ) . '">WooCommerce</a>';
        }
        
        echo '<a href="?page=ai-search&tab=cache" class="nav-tab ' . ( $active_tab == 'cache' ? 'nav-tab-active' : '' ) . '">Cache Management</a>';
        echo '</h2>';
    }
    
    /**
     * Display tab content
     */
    private function display_tab_content( $active_tab ) {
        switch ( $active_tab ) {
            case 'general':
                include plugin_dir_path( __FILE__ ) . 'views/settings-general.php';
                break;
            case 'embeddings':
                include plugin_dir_path( __FILE__ ) . 'views/settings-embeddings.php';
                break;
            case 'custom-fields':
                include plugin_dir_path( __FILE__ ) . 'views/settings-custom-fields.php';
                break;
            case 'woocommerce':
                if ( class_exists( 'WooCommerce' ) ) {
                    include plugin_dir_path( __FILE__ ) . 'views/settings-woocommerce.php';
                }
                break;
            case 'cache':
                include plugin_dir_path( __FILE__ ) . 'views/settings-cache.php';
                break;
        }
    }
    
    /**
     * Generate embedding for selected custom post type.
     */
    public function generate_selected_embeddings() {
        if ( ! current_user_can( 'manage_options' ) || ! isset( $_POST['cpt'] ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        $cpt = sanitize_text_field( $_POST['cpt'] );
        $limit = isset( $_POST['limit'] ) ? intval( $_POST['limit'] ) : 50;
        $limit = min( max( $limit, 1 ), 1000 );
        $processed_titles = [];

        $posts = get_posts([
            'numberposts' => $limit,
            'post_type'   => $cpt,
            'post_status' => 'publish',
            'meta_query'  => [
                [
                    'key'     => '_ai_search_embedding',
                    'compare' => 'NOT EXISTS'
                ]
            ]
        ]);

        $ai_search = AI_Search::get_instance();
        foreach ( $posts as $post ) {
            $ai_search->generate_embedding( $post->ID );
            $processed_titles[] = $post->post_title;
        }

        set_transient( 'ai_search_processed_titles', $processed_titles, MINUTE_IN_SECONDS );
        wp_redirect( admin_url( 'options-general.php?page=ai-search&embeddings_generated=true&tab=embeddings' ) );
        exit;
    }

    /**
     * Clear all embedding cache (transients and post meta).
     */
    public function clear_embeddings_cache() {
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        check_admin_referer( 'ai_search_clear_cache' );

        $cache_type = isset( $_POST['cache_type'] ) ? sanitize_text_field( $_POST['cache_type'] ) : 'transients';
        $cleared_count = 0;

        if ( $cache_type === 'transients' || $cache_type === 'all' ) {
            $cleared_count += $this->clear_embedding_transients();
        }

        if ( $cache_type === 'post_meta' || $cache_type === 'all' ) {
            $cleared_count += $this->clear_post_meta_embeddings();
        }

        $message = $cache_type === 'all' ? 'all_cache_cleared' : $cache_type . '_cleared';
        wp_redirect( admin_url( 'options-general.php?page=ai-search&cache_cleared=' . $message . '&count=' . $cleared_count . '&tab=cache' ) );
        exit;
    }

    /**
     * Validate the service token via admin action.
     */
    public function validate_service_token() {
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        check_admin_referer( 'ai_search_validate_token' );

        $service_token = get_option( 'ai_search_service_token', '' );
        if ( empty( $service_token ) ) {
            wp_redirect( admin_url( 'options-general.php?page=ai-search&token_validation=no_token&tab=general' ) );
            exit;
        }

        $validation_result = $this->service_client->validate_token();
        
        if ( $validation_result === false ) {
            wp_redirect( admin_url( 'options-general.php?page=ai-search&token_validation=error&tab=general' ) );
        } elseif ( isset( $validation_result['valid'] ) && $validation_result['valid'] === true ) {
            set_transient( 'ai_search_validation_data', $validation_result, 300 );
            wp_redirect( admin_url( 'options-general.php?page=ai-search&token_validation=success&tab=general' ) );
        } else {
            set_transient( 'ai_search_validation_error', $validation_result, 300 );
            wp_redirect( admin_url( 'options-general.php?page=ai-search&token_validation=invalid&tab=general' ) );
        }
        
        exit;
    }

    /**
     * Save custom fields settings.
     */
    public function save_custom_fields_settings() {
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        check_admin_referer( 'ai_search_save_custom_fields' );

        $custom_fields = isset( $_POST['custom_fields'] ) ? $_POST['custom_fields'] : [];
        $post_types = get_post_types( [ 'public' => true ] );
        
        foreach ( $post_types as $post_type ) {
            if ( isset( $custom_fields[ $post_type ] ) && is_array( $custom_fields[ $post_type ] ) ) {
                $selected_fields = array_map( 'sanitize_text_field', $custom_fields[ $post_type ] );
                update_option( 'ai_search_custom_fields_' . $post_type, $selected_fields );
            } else {
                delete_option( 'ai_search_custom_fields_' . $post_type );
            }
        }

        wp_redirect( admin_url( 'options-general.php?page=ai-search&custom_fields_saved=true&tab=custom-fields' ) );
        exit;
    }

    /**
     * Save WooCommerce fields settings.
     */
    public function save_woocommerce_fields_settings() {
        if ( ! current_user_can( 'manage_options' ) || ! class_exists( 'WooCommerce' ) ) {
            wp_die( __( 'Unauthorized access', 'ai-search' ) );
        }

        check_admin_referer( 'ai_search_save_woocommerce_fields' );

        $woocommerce_fields = isset( $_POST['woocommerce_fields'] ) ? $_POST['woocommerce_fields'] : [];
        
        if ( ! empty( $woocommerce_fields ) && is_array( $woocommerce_fields ) ) {
            $selected_fields = array_map( 'sanitize_text_field', $woocommerce_fields );
            update_option( 'ai_search_woocommerce_fields', $selected_fields );
        } else {
            delete_option( 'ai_search_woocommerce_fields' );
        }

        wp_redirect( admin_url( 'options-general.php?page=ai-search&woocommerce_fields_saved=true&tab=woocommerce' ) );
        exit;
    }

    /**
     * Clear embedding transients from WordPress cache.
     */
    private function clear_embedding_transients() {
        global $wpdb;
        
        $result = $wpdb->query( 
            $wpdb->prepare( 
                "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
                '_transient_ai_search_embedding_%',
                '_transient_timeout_ai_search_embedding_%'
            )
        );

        $result += $wpdb->query( 
            $wpdb->prepare( 
                "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
                '_transient_ai_service_embedding_%',
                '_transient_timeout_ai_service_embedding_%'
            )
        );

        return $result;
    }

    /**
     * Clear post meta embeddings.
     */
    private function clear_post_meta_embeddings() {
        global $wpdb;
        
        $result = $wpdb->query( 
            $wpdb->prepare( 
                "DELETE FROM {$wpdb->postmeta} WHERE meta_key = %s",
                '_ai_search_embedding'
            )
        );

        return $result;
    }

    /**
     * Get cache statistics.
     */
    public function get_cache_statistics() {
        global $wpdb;
        
        $transients = $wpdb->get_var( 
            $wpdb->prepare( 
                "SELECT COUNT(*) FROM {$wpdb->options} WHERE option_name LIKE %s OR option_name LIKE %s",
                '_transient_ai_search_embedding_%',
                '_transient_ai_service_embedding_%'
            )
        );

        $post_meta = $wpdb->get_var( 
            $wpdb->prepare( 
                "SELECT COUNT(*) FROM {$wpdb->postmeta} WHERE meta_key = %s",
                '_ai_search_embedding'
            )
        );

        return [
            'transients' => intval( $transients ),
            'post_meta' => intval( $post_meta )
        ];
    }

    /**
     * Get all custom fields used by a specific post type.
     */
    public function get_custom_fields_for_post_type( $post_type ) {
        global $wpdb;

        $fields = [];

        // Get regular custom fields (non-underscore prefixed)
        $query = $wpdb->prepare( "
            SELECT DISTINCT pm.meta_key
            FROM {$wpdb->postmeta} pm
            INNER JOIN {$wpdb->posts} p ON pm.post_id = p.ID
            WHERE p.post_type = %s
            AND pm.meta_key NOT LIKE '\_%'
            AND pm.meta_key != 'ai_search_embedding'
            AND pm.meta_value != ''
            ORDER BY pm.meta_key
        ", $post_type );

        $regular_fields = $wpdb->get_col( $query );
        if ( $regular_fields ) {
            $fields = array_merge( $fields, $regular_fields );
        }

        // If ACF is active, get ACF field groups for this post type
        if ( function_exists( 'acf_get_field_groups' ) ) {
            $field_groups = acf_get_field_groups( [ 'post_type' => $post_type ] );

            foreach ( $field_groups as $field_group ) {
                $acf_fields = acf_get_fields( $field_group['key'] );

                if ( $acf_fields ) {
                    foreach ( $acf_fields as $field ) {
                        // Only include fields that can be converted to text
                        $searchable_types = [
                            'text', 'textarea', 'number', 'email', 'url', 'password',
                            'wysiwyg', 'select', 'checkbox', 'radio', 'button_group',
                            'true_false', 'post_object', 'relationship', 'taxonomy',
                            'user', 'date_picker', 'date_time_picker', 'time_picker',
                            'color_picker'
                        ];

                        if ( in_array( $field['type'], $searchable_types ) ) {
                            $fields[] = $field['name'];
                        }
                    }
                }
            }
        }

        // Remove duplicates and sort
        $fields = array_unique( $fields );
        sort( $fields );

        return $fields;
    }

    /**
     * Get available WooCommerce fields.
     */
    public function get_woocommerce_fields() {
        return [
            'content' => [
                'product_description' => 'Product Description',
                'product_short_description' => 'Short Description',
                'product_sku' => 'Product SKU',
            ],
            'taxonomies' => [
                'product_categories' => 'Product Categories',
                'product_tags' => 'Product Tags',
            ]
        ];
    }

    /**
     * Get product attributes.
     */
    public function get_product_attributes() {
        if ( ! class_exists( 'WooCommerce' ) ) {
            return [];
        }
        return wc_get_attribute_taxonomies();
    }

    /**
     * Get default WooCommerce fields to include.
     */
    public function get_default_woocommerce_fields() {
        return [
            'product_description',
            'product_short_description',
            'product_categories',
            'product_tags'
        ];
    }
}