// ------------------------
// Админка: подменю Cashback
// ------------------------
add_action('admin_menu', function() {
    add_submenu_page(
        'telegram-auth', // родительское меню плагина (slug вашей страницы настроек плагина)
        'Cashback',
        'Cashback',
        'manage_options',
        'telegram-auth-cashback',
        'telegram_auth_render_cashback_admin_page'
    );
});

function telegram_auth_render_cashback_admin_page() {
    if (!current_user_can('manage_options')) {
        wp_die('Недостаточно прав');
    }

    // Обработка сохранения даты старта
    if (!empty($_POST['telegram_cashback_start_date']) && check_admin_referer('telegram_cashback_save','telegram_cashback_nonce')) {
        update_option('telegram_cashback_start_date', sanitize_text_field($_POST['telegram_cashback_start_date']));
    }

    // Обработка CRUD для UTM меток
    global $wpdb; $table = $wpdb->prefix . 'cashback_utm_tags';
    if (!empty($_POST['utm_action']) && check_admin_referer('telegram_cashback_save','telegram_cashback_nonce')) {
        if ($_POST['utm_action'] === 'add') {
            $utm = sanitize_text_field($_POST['utm'] ?? '');
            $amount = floatval($_POST['cashback_amount'] ?? 0);
            $active = !empty($_POST['is_active']) ? 1 : 0;
            if ($utm !== '') {
                $wpdb->insert($table, [ 'utm' => $utm, 'cashback_amount' => $amount, 'is_active' => $active ], ['%s','%f','%d']);
            }
        } elseif ($_POST['utm_action'] === 'toggle' && !empty($_POST['id'])) {
            $id = intval($_POST['id']);
            $row = $wpdb->get_row($wpdb->prepare("SELECT is_active FROM `$table` WHERE id=%d", $id));
            if ($row) { $wpdb->update($table, ['is_active' => $row->is_active ? 0 : 1], ['id' => $id], ['%d'], ['%d']); }
        } elseif ($_POST['utm_action'] === 'delete' && !empty($_POST['id'])) {
            $id = intval($_POST['id']);
            $wpdb->delete($table, ['id' => $id], ['%d']);
        }
    }

    $start_date = get_option('telegram_cashback_start_date', '');
    $utm_rows = $wpdb->get_results("SELECT * FROM `$table` ORDER BY id DESC");

    echo '<div class="wrap">';
    echo '<h1>Cashback</h1>';

    echo '<h2 class="nav-tab-wrapper">';
    $active_tab = isset($_GET['tab']) ? sanitize_key($_GET['tab']) : 'settings';
    echo '<a href="?page=telegram-auth-cashback&tab=settings" class="nav-tab ' . ($active_tab==='settings'?'nav-tab-active':'') . '">Настройки</a>';
    echo '<a href="?page=telegram-auth-cashback&tab=stats" class="nav-tab ' . ($active_tab==='stats'?'nav-tab-active':'') . '">Статистика</a>';
    echo '</h2>';

    if ($active_tab === 'settings') {
        echo '<form method="post">';
        wp_nonce_field('telegram_cashback_save','telegram_cashback_nonce');
        echo '<table class="form-table"><tbody>';
        echo '<tr><th><label for="telegram_cashback_start_date">Дата начала</label></th><td>';
        echo '<input type="date" id="telegram_cashback_start_date" name="telegram_cashback_start_date" value="' . esc_attr($start_date) . '" />';
        echo '</td></tr>';
        echo '</tbody></table>';
        echo '<p><button type="submit" class="button button-primary">Сохранить</button></p>';
        echo '</form>';

        echo '<hr />';
        echo '<h2>UTM метки</h2>';
        echo '<form method="post" style="margin-bottom:20px;">';
        wp_nonce_field('telegram_cashback_save','telegram_cashback_nonce');
        echo '<input type="hidden" name="utm_action" value="add" />';
        echo '<input type="text" name="utm" placeholder="utm_source" style="width:200px;" required /> ';
        echo '<input type="number" step="0.01" name="cashback_amount" placeholder="Сумма кешбэка" style="width:160px;" required /> ';
        echo '<label><input type="checkbox" name="is_active" checked /> Активно</label> ';
        echo '<button type="submit" class="button">Добавить</button>';
        echo '</form>';

        echo '<table class="widefat striped"><thead><tr><th>ID</th><th>UTM</th><th>Сумма</th><th>Статус</th><th>Действия</th></tr></thead><tbody>';
        if (!empty($utm_rows)) {
            foreach ($utm_rows as $row) {
                echo '<tr>';
                echo '<td>' . intval($row->id) . '</td>';
                echo '<td>' . esc_html($row->utm) . '</td>';
                echo '<td>' . esc_html(number_format((float)$row->cashback_amount, 2, ',', ' ')) . '</td>';
                echo '<td>' . ($row->is_active ? '<span style="color:green;">Активно</span>' : '<span style="color:#999;">Отключено</span>') . '</td>';
                echo '<td>';
                echo '<form method="post" style="display:inline;">';
                wp_nonce_field('telegram_cashback_save','telegram_cashback_nonce');
                echo '<input type="hidden" name="utm_action" value="toggle" />';
                echo '<input type="hidden" name="id" value="' . intval($row->id) . '" />';
                echo '<button class="button">' . ($row->is_active ? 'Отключить' : 'Включить') . '</button>';
                echo '</form> ';
                echo '<form method="post" style="display:inline; margin-left:8px;">';
                wp_nonce_field('telegram_cashback_save','telegram_cashback_nonce');
                echo '<input type="hidden" name="utm_action" value="delete" />';
                echo '<input type="hidden" name="id" value="' . intval($row->id) . '" />';
                echo '<button class="button button-link-delete" onclick="return confirm(\'Удалить метку?\');">Удалить</button>';
                echo '</form>';
                echo '</td>';
                echo '</tr>';
            }
        } else {
            echo '<tr><td colspan="5">Пока нет меток</td></tr>';
        }
        echo '</tbody></table>';
    } else {
        echo '<p>Статистика будет реализована на следующем шаге.</p>';
    }

    echo '</div>';
}