<?php

declare(strict_types=1);

require_once __DIR__ . '/_bootstrap.php'; // $pdo, $iduserlogin

try {
    $user_id = (int)$iduserlogin;
    if ($user_id <= 0) {
        http_response_code(401);
        echo json_encode(['success' => false, 'message' => 'Unauthorized']);
        exit;
    }

    $defaults = [
        'notify_email'               => 1,
        'notify_whatsapp'            => 0,
        'notify_push'                => 0,
        'notify_booking_confirm'     => 1,
        'notify_booking_cancel'      => 1,
        'notify_session_cancel'      => 1,
        'notify_payment_receipt'     => 1,
        'notify_expiration_reminder' => 1,
        'newsletter_opt_in'          => 0,
        'marketing_opt_in'           => 0,
        'locale'                     => 'it',
        'timezone'                   => 'Europe/Rome',
    ];

    $stmt = $pdo->prepare("
        SELECT *
        FROM user_settings
        WHERE user_id = ?
        LIMIT 1
    ");
    $stmt->execute([$user_id]);
    $settings = $stmt->fetch(PDO::FETCH_ASSOC);

    if (!$settings) {
        // Create row with defaults (user_id only required by your schema)
        $ins = $pdo->prepare("INSERT INTO user_settings (user_id) VALUES (?)");
        $ins->execute([$user_id]);

        // Reload
        $stmt = $pdo->prepare("SELECT * FROM user_settings WHERE user_id = ? LIMIT 1");
        $stmt->execute([$user_id]);
        $settings = $stmt->fetch(PDO::FETCH_ASSOC) ?: [];
    }

    $userSettings = array_merge($defaults, $settings);

    // Cast numeric flags to int for Flutter
    foreach (
        [
            'notify_email',
            'notify_whatsapp',
            'notify_push',
            'notify_booking_confirm',
            'notify_booking_cancel',
            'notify_session_cancel',
            'notify_payment_receipt',
            'notify_expiration_reminder',
            'newsletter_opt_in',
            'marketing_opt_in',
        ] as $k
    ) {
        if (isset($userSettings[$k])) {
            $userSettings[$k] = is_numeric($userSettings[$k]) ? (int)$userSettings[$k] : $userSettings[$k];
        }
    }

    echo json_encode([
        'success' => true,
        'user_id' => $user_id,
        'settings' => $userSettings
    ], JSON_UNESCAPED_UNICODE);
} catch (Throwable $e) {
    http_response_code(500);
    echo json_encode(['success' => false, 'message' => 'Server error.', 'error' => $e->getMessage()]);
}