<?php
/**
 * Admin: settings page, customer linking, connection test.
 */

defined( 'ABSPATH' ) || exit;

class WooDoo_Admin {

    public static function init(): void {
        add_action( 'admin_menu',             [ __CLASS__, 'add_menu' ] );
        add_action( 'admin_init',             [ __CLASS__, 'register_settings' ] );
        add_action( 'admin_enqueue_scripts',  [ __CLASS__, 'enqueue_admin_assets' ] );

        // User profile: add Odoo Partner ID field
        add_action( 'show_user_profile',      [ __CLASS__, 'user_profile_fields' ] );
        add_action( 'edit_user_profile',      [ __CLASS__, 'user_profile_fields' ] );
        add_action( 'personal_options_update',[ __CLASS__, 'save_user_profile_fields' ] );
        add_action( 'edit_user_profile_update',[ __CLASS__, 'save_user_profile_fields' ] );

        // AJAX handlers (admin only)
        add_action( 'wp_ajax_woodoo_test_connection',    [ __CLASS__, 'ajax_test_connection' ] );
        add_action( 'wp_ajax_woodoo_search_partners',    [ __CLASS__, 'ajax_search_partners' ] );
        add_action( 'wp_ajax_woodoo_search_wc_customers',[ __CLASS__, 'ajax_search_wc_customers' ] );
        add_action( 'wp_ajax_woodoo_link_customer',      [ __CLASS__, 'ajax_link_customer' ] );
        add_action( 'wp_ajax_woodoo_unlink_customer',    [ __CLASS__, 'ajax_unlink_customer' ] );

        // WC customer list column
        add_filter( 'manage_users_columns',              [ __CLASS__, 'add_users_column' ] );
        add_filter( 'manage_users_custom_column',        [ __CLASS__, 'render_users_column' ], 10, 3 );
    }

    // ── Menu & Settings ───────────────────────────────────────────────────

    public static function add_menu(): void {
        add_submenu_page(
            'woocommerce',
            __( 'WooDoo – Odoo Integration', 'woodoo' ),
            __( 'Odoo Integration', 'woodoo' ),
            'manage_woocommerce',
            'woodoo-settings',
            [ __CLASS__, 'render_settings_page' ]
        );
    }

    public static function register_settings(): void {
        $fields = [
            'woodoo_odoo_url'      => __( 'Odoo URL (e.g. https://odoo.example.com)', 'woodoo' ),
            'woodoo_odoo_db'       => __( 'Database Name', 'woodoo' ),
            'woodoo_odoo_username' => __( 'Username / Login', 'woodoo' ),
            'woodoo_odoo_api_key'  => __( 'API Key', 'woodoo' ),
        ];
        foreach ( $fields as $key => $label ) {
            register_setting( 'woodoo_settings', $key, [ 'sanitize_callback' => 'sanitize_text_field' ] );
        }

        // Meeting settings
        $meeting_fields = [
            'woodoo_meeting_duration'    => 30,   // minutes
            'woodoo_available_days'      => [ 1, 2, 3, 4, 5 ], // Mon-Fri
            'woodoo_available_from'      => '09:00',
            'woodoo_available_to'        => '17:00',
            'woodoo_meeting_title_prefix'=> 'Meeting via WooDoo',
        ];
        foreach ( $meeting_fields as $key => $default ) {
            register_setting( 'woodoo_settings', $key );
        }

        // Order sync toggle
        register_setting( 'woodoo_settings', 'woodoo_sync_orders', [ 'sanitize_callback' => 'rest_sanitize_boolean' ] );
    }

    public static function enqueue_admin_assets( string $hook ): void {
        if ( strpos( $hook, 'woodoo-settings' ) === false
             && $hook !== 'user-edit.php'
             && $hook !== 'profile.php' ) {
            return;
        }
        wp_enqueue_style(
            'woodoo-admin',
            WOODOO_URL . 'assets/css/woodoo-admin.css',
            [],
            WOODOO_VERSION
        );
        wp_enqueue_script(
            'woodoo-admin',
            WOODOO_URL . 'assets/js/woodoo-admin.js',
            [ 'jquery' ],
            WOODOO_VERSION,
            true
        );
        wp_localize_script( 'woodoo-admin', 'WooDooAdmin', [
            'nonce'    => wp_create_nonce( 'woodoo_admin' ),
            'ajax_url' => admin_url( 'admin-ajax.php' ),
            'i18n'     => [
                'testing'          => __( 'Testing…', 'woodoo' ),
                'searching'        => __( 'Searching…', 'woodoo' ),
                'no_wc_customers'  => __( 'No customers found.', 'woodoo' ),
                'no_odoo_partners' => __( 'No Odoo partners found.', 'woodoo' ),
                'link_done'        => __( 'Linked!', 'woodoo' ),
                'unlink_confirm'   => __( 'Remove the Odoo link for this customer?', 'woodoo' ),
                'unlinked'         => __( 'Unlinked', 'woodoo' ),
                'error'            => __( 'Error. Check console.', 'woodoo' ),
                'search_odoo'      => __( 'Search Odoo partners…', 'woodoo' ),
                'linked_to'        => __( 'Linked to', 'woodoo' ),
                'not_linked'       => __( 'Not linked', 'woodoo' ),
            ],
        ] );
    }

    // ── Settings Page HTML ────────────────────────────────────────────────

    public static function render_settings_page(): void {
        if ( ! current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Access denied.', 'woodoo' ) );
        }

        $days_map = [
            1 => __( 'Monday', 'woodoo' ),
            2 => __( 'Tuesday', 'woodoo' ),
            3 => __( 'Wednesday', 'woodoo' ),
            4 => __( 'Thursday', 'woodoo' ),
            5 => __( 'Friday', 'woodoo' ),
            6 => __( 'Saturday', 'woodoo' ),
            7 => __( 'Sunday', 'woodoo' ),
        ];
        $saved_days = (array) get_option( 'woodoo_available_days', [ 1, 2, 3, 4, 5 ] );
        ?>
        <div class="wrap woodoo-settings">
            <h1><?php esc_html_e( 'WooDoo – Odoo Integration', 'woodoo' ); ?></h1>

            <nav class="nav-tab-wrapper">
                <a href="#tab-connection" class="nav-tab nav-tab-active"><?php esc_html_e( 'Connection', 'woodoo' ); ?></a>
                <a href="#tab-meetings"   class="nav-tab"><?php esc_html_e( 'Meetings', 'woodoo' ); ?></a>
                <a href="#tab-orders"     class="nav-tab"><?php esc_html_e( 'Order Sync', 'woodoo' ); ?></a>
                <a href="#tab-customers"  class="nav-tab"><?php esc_html_e( 'Customers', 'woodoo' ); ?></a>
            </nav>

            <form method="post" action="options.php">
                <?php settings_fields( 'woodoo_settings' ); ?>

                <!-- Connection Tab -->
                <div id="tab-connection" class="woodoo-tab active">
                    <h2><?php esc_html_e( 'Odoo Connection', 'woodoo' ); ?></h2>
                    <table class="form-table">
                        <tr>
                            <th><?php esc_html_e( 'Odoo URL', 'woodoo' ); ?></th>
                            <td>
                                <input type="url" name="woodoo_odoo_url" value="<?php echo esc_attr( get_option( 'woodoo_odoo_url' ) ); ?>" class="regular-text" placeholder="https://odoo.yourcompany.com">
                                <p class="description"><?php esc_html_e( 'Include https://, no trailing slash.', 'woodoo' ); ?></p>
                            </td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Database Name', 'woodoo' ); ?></th>
                            <td><input type="text" name="woodoo_odoo_db" value="<?php echo esc_attr( get_option( 'woodoo_odoo_db' ) ); ?>" class="regular-text"></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Username', 'woodoo' ); ?></th>
                            <td><input type="text" name="woodoo_odoo_username" value="<?php echo esc_attr( get_option( 'woodoo_odoo_username' ) ); ?>" class="regular-text" autocomplete="off"></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'API Key', 'woodoo' ); ?></th>
                            <td>
                                <input type="password" name="woodoo_odoo_api_key" value="<?php echo esc_attr( get_option( 'woodoo_odoo_api_key' ) ); ?>" class="regular-text" autocomplete="off">
                                <p class="description"><?php esc_html_e( 'Generate in Odoo: Settings → Users → Your User → Account Security → New API Key.', 'woodoo' ); ?></p>
                            </td>
                        </tr>
                    </table>
                    <p>
                        <button type="button" id="woodoo-test-connection" class="button button-secondary">
                            <?php esc_html_e( 'Test Connection', 'woodoo' ); ?>
                        </button>
                        <span id="woodoo-test-result" style="margin-left:12px;"></span>
                    </p>
                </div>

                <!-- Meetings Tab -->
                <div id="tab-meetings" class="woodoo-tab" style="display:none;">
                    <h2><?php esc_html_e( 'Meeting / Booking Settings', 'woodoo' ); ?></h2>
                    <table class="form-table">
                        <tr>
                            <th><?php esc_html_e( 'Slot Duration (minutes)', 'woodoo' ); ?></th>
                            <td>
                                <input type="number" name="woodoo_meeting_duration" value="<?php echo esc_attr( get_option( 'woodoo_meeting_duration', 30 ) ); ?>" min="15" max="240" step="15" class="small-text">
                            </td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Available Days', 'woodoo' ); ?></th>
                            <td>
                                <?php foreach ( $days_map as $num => $label ) : ?>
                                    <label style="margin-right:12px;">
                                        <input type="checkbox" name="woodoo_available_days[]" value="<?php echo esc_attr( $num ); ?>"
                                            <?php checked( in_array( $num, $saved_days, true ) ); ?>>
                                        <?php echo esc_html( $label ); ?>
                                    </label>
                                <?php endforeach; ?>
                            </td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Available From', 'woodoo' ); ?></th>
                            <td><input type="time" name="woodoo_available_from" value="<?php echo esc_attr( get_option( 'woodoo_available_from', '09:00' ) ); ?>"></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Available To', 'woodoo' ); ?></th>
                            <td><input type="time" name="woodoo_available_to" value="<?php echo esc_attr( get_option( 'woodoo_available_to', '17:00' ) ); ?>"></td>
                        </tr>
                        <tr>
                            <th><?php esc_html_e( 'Meeting Title Prefix', 'woodoo' ); ?></th>
                            <td><input type="text" name="woodoo_meeting_title_prefix" value="<?php echo esc_attr( get_option( 'woodoo_meeting_title_prefix', 'Meeting via WooDoo' ) ); ?>" class="regular-text"></td>
                        </tr>
                    </table>
                </div>

                <!-- Order Sync Tab -->
                <div id="tab-orders" class="woodoo-tab" style="display:none;">
                    <h2><?php esc_html_e( 'Order → Odoo Sales Order Sync', 'woodoo' ); ?></h2>
                    <table class="form-table">
                        <tr>
                            <th><?php esc_html_e( 'Enable Order Sync', 'woodoo' ); ?></th>
                            <td>
                                <label>
                                    <input type="checkbox" name="woodoo_sync_orders" value="1" <?php checked( get_option( 'woodoo_sync_orders', 1 ) ); ?>>
                                    <?php esc_html_e( 'Automatically create a Sales Order in Odoo when a WooCommerce order is placed (status: processing).', 'woodoo' ); ?>
                                </label>
                            </td>
                        </tr>
                    </table>
                    <div class="woodoo-info-box">
                        <strong><?php esc_html_e( 'How it works:', 'woodoo' ); ?></strong>
                        <ul>
                            <li><?php esc_html_e( 'When a WooCommerce order reaches "Processing" status, WooDoo finds or creates the customer in Odoo.', 'woodoo' ); ?></li>
                            <li><?php esc_html_e( 'Products are matched by SKU (default_code). Unmatched items are added as generic lines.', 'woodoo' ); ?></li>
                            <li><?php esc_html_e( 'The Odoo Sales Order is left in "Quotation" (draft) state, ready for invoicing.', 'woodoo' ); ?></li>
                            <li><?php esc_html_e( 'The Odoo SO reference is saved as order meta and visible in the WC order screen.', 'woodoo' ); ?></li>
                        </ul>
                    </div>
                </div>

                <!-- Customer Linking Tab -->
                <div id="tab-customers" class="woodoo-tab" style="display:none;">
                    <h2><?php esc_html_e( 'Customer Linking', 'woodoo' ); ?></h2>
                    <p><?php esc_html_e( 'Search a WooCommerce customer, then search and pick their matching Odoo partner. Emails do not need to match.', 'woodoo' ); ?></p>

                    <div class="woodoo-linker-panel">
                        <div class="woodoo-linker-col">
                            <h3><?php esc_html_e( '1. Find WooCommerce Customer', 'woodoo' ); ?></h3>
                            <div class="woodoo-search-row">
                                <input type="text" id="woo-customer-search"
                                       class="regular-text"
                                       placeholder="<?php esc_attr_e( 'Name or email…', 'woodoo' ); ?>">
                                <button type="button" id="woo-customer-search-btn" class="button button-secondary">
                                    <?php esc_html_e( 'Search', 'woodoo' ); ?>
                                </button>
                            </div>
                            <div id="woo-customer-results" class="woodoo-results-list"></div>
                        </div>

                        <div class="woodoo-linker-col" id="woodoo-odoo-col" style="display:none;">
                            <h3><?php esc_html_e( '2. Find Odoo Partner', 'woodoo' ); ?></h3>
                            <p id="woodoo-linking-for" class="woodoo-linking-for"></p>
                            <div class="woodoo-search-row">
                                <input type="text" id="woodoo-odoo-partner-search"
                                       class="regular-text"
                                       placeholder="<?php esc_attr_e( 'Name or email…', 'woodoo' ); ?>">
                                <button type="button" id="woodoo-odoo-partner-search-btn" class="button button-secondary">
                                    <?php esc_html_e( 'Search', 'woodoo' ); ?>
                                </button>
                            </div>
                            <div id="woodoo-odoo-partner-results" class="woodoo-results-list"></div>
                        </div>
                    </div>
                </div>

                <?php submit_button(); ?>
            </form>
        </div>
        <?php
    }

    // ── User Profile Fields ───────────────────────────────────────────────

    public static function user_profile_fields( WP_User $user ): void {
        if ( ! current_user_can( 'edit_users' ) ) return;

        $partner_id = get_user_meta( $user->ID, 'woodoo_odoo_partner_id', true );
        $partner_name = get_user_meta( $user->ID, 'woodoo_odoo_partner_name', true );
        ?>
        <h2><?php esc_html_e( 'Odoo Integration (WooDoo)', 'woodoo' ); ?></h2>
        <table class="form-table">
            <tr>
                <th><?php esc_html_e( 'Odoo Partner ID', 'woodoo' ); ?></th>
                <td>
                    <input type="number" id="woodoo_odoo_partner_id" name="woodoo_odoo_partner_id"
                           value="<?php echo esc_attr( $partner_id ); ?>"
                           class="small-text" min="1">
                    <?php if ( $partner_name ) : ?>
                        <span id="woodoo-partner-name-display" style="margin-left:8px;color:#666;">
                            <?php echo esc_html( $partner_name ); ?>
                        </span>
                    <?php endif; ?>
                    <p class="description">
                        <?php esc_html_e( 'Leave blank to auto-match by email on next sync. Or type an ID and the name will resolve automatically.', 'woodoo' ); ?>
                    </p>
                    <input type="hidden" name="woodoo_nonce" value="<?php echo esc_attr( wp_create_nonce( 'woodoo_user_profile_' . $user->ID ) ); ?>">

                    <p>
                        <strong><?php esc_html_e( 'Search Odoo partners:', 'woodoo' ); ?></strong><br>
                        <input type="text" id="woodoo-partner-search-input" class="regular-text"
                               placeholder="<?php esc_attr_e( 'Name or email…', 'woodoo' ); ?>"
                               data-user-id="<?php echo esc_attr( $user->ID ); ?>">
                        <button type="button" id="woodoo-partner-search-btn" class="button button-secondary" style="margin-left:4px;">
                            <?php esc_html_e( 'Search', 'woodoo' ); ?>
                        </button>
                        <div id="woodoo-partner-search-results" style="margin-top:8px;"></div>
                    </p>
                </td>
            </tr>
            <?php
            $odoo_so_count = get_user_meta( $user->ID, 'woodoo_so_count', true );
            if ( $odoo_so_count ) : ?>
            <tr>
                <th><?php esc_html_e( 'Odoo Sales Orders', 'woodoo' ); ?></th>
                <td>
                    <span><?php echo esc_html( $odoo_so_count ); ?> <?php esc_html_e( 'orders synced to Odoo', 'woodoo' ); ?></span>
                </td>
            </tr>
            <?php endif; ?>
        </table>
        <?php
    }

    public static function save_user_profile_fields( int $user_id ): void {
        if ( ! isset( $_POST['woodoo_nonce'] )
             || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['woodoo_nonce'] ) ), 'woodoo_user_profile_' . $user_id )
        ) {
            return;
        }

        if ( ! current_user_can( 'edit_user', $user_id ) ) return;

        $partner_id = isset( $_POST['woodoo_odoo_partner_id'] )
            ? absint( $_POST['woodoo_odoo_partner_id'] )
            : 0;

        if ( $partner_id > 0 ) {
            update_user_meta( $user_id, 'woodoo_odoo_partner_id', $partner_id );

            // Resolve name from Odoo
            $api = woodoo_api();
            if ( $api ) {
                $partners = $api->read( 'res.partner', [ $partner_id ], [ 'name', 'email' ] );
                if ( ! empty( $partners[0]['name'] ) ) {
                    update_user_meta( $user_id, 'woodoo_odoo_partner_name', sanitize_text_field( $partners[0]['name'] ) );
                }
            }
        } else {
            delete_user_meta( $user_id, 'woodoo_odoo_partner_id' );
            delete_user_meta( $user_id, 'woodoo_odoo_partner_name' );
        }
    }

    // ── Users List Column ─────────────────────────────────────────────────

    public static function add_users_column( array $columns ): array {
        $columns['woodoo_odoo'] = __( 'Odoo Partner', 'woodoo' );
        return $columns;
    }

    public static function render_users_column( string $value, string $column, int $user_id ): string {
        if ( $column !== 'woodoo_odoo' ) return $value;
        $partner_id   = get_user_meta( $user_id, 'woodoo_odoo_partner_id', true );
        $partner_name = get_user_meta( $user_id, 'woodoo_odoo_partner_name', true );
        if ( $partner_id ) {
            return '<span style="color:#2271b1;">' . esc_html( $partner_name ?: "#$partner_id" ) . '</span>';
        }
        return '<span style="color:#999;">—</span>';
    }

    // ── AJAX Handlers ─────────────────────────────────────────────────────

    public static function ajax_test_connection(): void {
        check_ajax_referer( 'woodoo_admin', 'nonce' );
        if ( ! current_user_can( 'manage_woocommerce' ) ) wp_send_json_error( 'Forbidden', 403 );

        $api = woodoo_api();
        if ( ! $api ) {
            wp_send_json_error( 'Credentials not saved yet. Save settings first.' );
        }

        wp_send_json_success( $api->test_connection() );
    }

    public static function ajax_search_partners(): void {
        check_ajax_referer( 'woodoo_admin', 'nonce' );
        if ( ! current_user_can( 'edit_users' ) ) wp_send_json_error( 'Forbidden', 403 );

        $q   = sanitize_text_field( wp_unslash( $_POST['query'] ?? '' ) );
        $api = woodoo_api();
        if ( ! $api || empty( $q ) ) wp_send_json_success( [] );

        $results = $api->search_read(
            'res.partner',
            [ '|', [ 'name', 'ilike', $q ], [ 'email', 'ilike', $q ] ],
            [ 'id', 'name', 'email', 'is_company' ],
            10
        );

        wp_send_json_success( $results );
    }

    public static function ajax_link_customer(): void {
        check_ajax_referer( 'woodoo_admin', 'nonce' );
        if ( ! current_user_can( 'edit_users' ) ) wp_send_json_error( 'Forbidden', 403 );

        $user_id    = absint( $_POST['user_id'] ?? 0 );
        $partner_id = absint( $_POST['partner_id'] ?? 0 );

        if ( ! $user_id || ! $partner_id ) wp_send_json_error( 'Invalid IDs' );

        $api = woodoo_api();
        if ( ! $api ) wp_send_json_error( 'API not configured' );

        $partners = $api->read( 'res.partner', [ $partner_id ], [ 'name', 'email' ] );
        if ( empty( $partners ) ) wp_send_json_error( 'Partner not found in Odoo' );

        update_user_meta( $user_id, 'woodoo_odoo_partner_id', $partner_id );
        update_user_meta( $user_id, 'woodoo_odoo_partner_name', sanitize_text_field( $partners[0]['name'] ) );

        wp_send_json_success( [
            'partner_id'   => $partner_id,
            'partner_name' => $partners[0]['name'],
        ] );
    }

    public static function ajax_unlink_customer(): void {
        check_ajax_referer( 'woodoo_admin', 'nonce' );
        if ( ! current_user_can( 'edit_users' ) ) wp_send_json_error( 'Forbidden', 403 );

        $user_id = absint( $_POST['user_id'] ?? 0 );
        if ( ! $user_id ) wp_send_json_error( 'Invalid user ID' );

        delete_user_meta( $user_id, 'woodoo_odoo_partner_id' );
        delete_user_meta( $user_id, 'woodoo_odoo_partner_name' );

        wp_send_json_success( [ 'user_id' => $user_id ] );
    }

    /**
     * Search WooCommerce customers by name or email.
     * Searches user_login, user_email, display_name in the users table,
     * AND first_name / last_name in user meta — so the email in WC doesn't
     * need to match Odoo at all.
     */
    public static function ajax_search_wc_customers(): void {
        check_ajax_referer( 'woodoo_admin', 'nonce' );
        if ( ! current_user_can( 'edit_users' ) ) wp_send_json_error( 'Forbidden', 403 );

        $q = sanitize_text_field( wp_unslash( $_POST['query'] ?? '' ) );
        if ( strlen( $q ) < 2 ) wp_send_json_error( 'Query too short' );

        // Search main user table columns
        $query1 = new WP_User_Query( [
            'search'         => '*' . $q . '*',
            'search_columns' => [ 'user_login', 'user_email', 'display_name' ],
            'number'         => 20,
            'fields'         => 'all',
        ] );

        // Search first_name / last_name meta fields
        $query2 = new WP_User_Query( [
            'number'     => 20,
            'fields'     => 'all',
            'meta_query' => [
                'relation' => 'OR',
                [ 'key' => 'first_name', 'value' => $q, 'compare' => 'LIKE' ],
                [ 'key' => 'last_name',  'value' => $q, 'compare' => 'LIKE' ],
            ],
        ] );

        // Merge and deduplicate
        $all  = array_merge( $query1->get_results(), $query2->get_results() );
        $seen = [];
        $users = [];
        foreach ( $all as $user ) {
            if ( isset( $seen[ $user->ID ] ) ) continue;
            $seen[ $user->ID ] = true;
            $users[] = $user;
        }

        if ( empty( $users ) ) {
            wp_send_json_success( [] );
        }

        $results = [];
        foreach ( $users as $user ) {
            $partner_id   = (int) get_user_meta( $user->ID, 'woodoo_odoo_partner_id', true );
            $partner_name = get_user_meta( $user->ID, 'woodoo_odoo_partner_name', true );

            $results[] = [
                'id'           => $user->ID,
                'display_name' => $user->display_name,
                'email'        => $user->user_email,
                'partner_id'   => $partner_id ?: null,
                'partner_name' => $partner_name ?: null,
                'edit_url'     => esc_url( get_edit_user_link( $user->ID ) ),
            ];
        }

        wp_send_json_success( $results );
    }
}