<?php
declare (strict_types = 1);
require_once __DIR__ . '/../includes/bootstrap_global.php';

if (session_status() !== PHP_SESSION_ACTIVE) {
    session_start();
}

function aprelik_redirect(string $path): never
{
    header('Location: ' . $path);
    exit;
}

function aprelik_clean(?string $value, int $maxLength = 0): string
{
    $value = trim((string) $value);
    $value = preg_replace('/\s+/u', ' ', $value) ?? '';

    if ($maxLength > 0 && mb_strlen($value) > $maxLength) {
        $value = mb_substr($value, 0, $maxLength);
    }

    return $value;
}

function aprelik_get_pdo(): PDO
{
    foreach (['pdo', 'db', 'database', 'conn'] as $name) {
        if (isset($GLOBALS[$name]) && $GLOBALS[$name] instanceof PDO) {
            return $GLOBALS[$name];
        }
    }

    throw new RuntimeException('PDO connection not found in bootstrap_global.php');
}

if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
    aprelik_redirect('/aprelik.php');
}

if (! empty($_POST['website'] ?? '')) {
    $_SESSION['aprelik_success'] = 'Спасибо. Форма отправлена.';
    aprelik_redirect('/aprelik.php');
}

$data = [
    'child_last_name'         => aprelik_clean($_POST['child_last_name'] ?? '', 120),
    'child_first_name'        => aprelik_clean($_POST['child_first_name'] ?? '', 120),
    'child_birthdate'         => aprelik_clean($_POST['child_birthdate'] ?? '', 10),

    'parent1_last_name'       => aprelik_clean($_POST['parent1_last_name'] ?? '', 120),
    'parent1_first_name'      => aprelik_clean($_POST['parent1_first_name'] ?? '', 120),
    'parent1_language'        => aprelik_clean($_POST['parent1_language'] ?? '', 120),

    'parent2_last_name'       => aprelik_clean($_POST['parent2_last_name'] ?? '', 120),
    'parent2_first_name'      => aprelik_clean($_POST['parent2_first_name'] ?? '', 120),
    'parent2_language'        => aprelik_clean($_POST['parent2_language'] ?? '', 120),

    'street_address'          => aprelik_clean($_POST['street_address'] ?? '', 255),
    'postal_code'             => aprelik_clean($_POST['postal_code'] ?? '', 30),
    'city'                    => aprelik_clean($_POST['city'] ?? '', 120),

    'parent1_phone'           => aprelik_clean($_POST['parent1_phone'] ?? '', 40),
    'parent2_phone'           => aprelik_clean($_POST['parent2_phone'] ?? '', 40),
    'email'                   => aprelik_clean($_POST['email'] ?? '', 190),

    'consent_rgpd'            => ! empty($_POST['consent_rgpd']) ? 1 : 0,
    'consent_email_diffusion' => ! empty($_POST['consent_email_diffusion']) ? 1 : 0,

    'school_day_address'      => aprelik_clean($_POST['school_day_address'] ?? '', 255),
    'age_group'               => aprelik_clean($_POST['age_group'] ?? '', 80),
    'notes'                   => aprelik_clean($_POST['notes'] ?? '', 5000),
];

$errors = [];

if ($data['child_last_name'] === '') {
    $errors[] = 'Укажите фамилию ребёнка.';
}

if ($data['child_first_name'] === '') {
    $errors[] = 'Укажите имя ребёнка.';
}

if ($data['child_birthdate'] === '') {
    $errors[] = 'Укажите дату рождения ребёнка.';
} else {
    $dt = DateTime::createFromFormat('Y-m-d', $data['child_birthdate']);
    if (! $dt || $dt->format('Y-m-d') !== $data['child_birthdate']) {
        $errors[] = 'Некорректная дата рождения.';
    }
}

if ($data['parent1_last_name'] === '') {
    $errors[] = 'Укажите фамилию родителя 1.';
}

if ($data['parent1_first_name'] === '') {
    $errors[] = 'Укажите имя родителя 1.';
}

if ($data['parent1_language'] === '') {
    $errors[] = 'Укажите язык родителя 1.';
}

if ($data['street_address'] === '') {
    $errors[] = 'Укажите адрес.';
}

if ($data['postal_code'] === '') {
    $errors[] = 'Укажите индекс.';
}

if ($data['city'] === '') {
    $errors[] = 'Укажите город.';
}

if ($data['parent1_phone'] === '') {
    $errors[] = 'Укажите телефон родителя 1.';
}

if ($data['email'] === '' || filter_var($data['email'], FILTER_VALIDATE_EMAIL) === false) {
    $errors[] = 'Укажите корректный email.';
}

if ($data['school_day_address'] === '') {
    $errors[] = 'Выберите адрес занятий.';
}

if ($data['age_group'] === '') {
    $errors[] = 'Выберите возрастную группу.';
}

if ($data['consent_email_diffusion'] !== 1) {
    $errors[] = 'Нужно согласиться на информационную рассылку.';
}

if ($data['consent_rgpd'] !== 1) {
    $errors[] = 'Нужно согласиться на обработку персональных данных.';
}

if ($errors !== []) {
    $_SESSION['aprelik_errors'] = $errors;
    $_SESSION['aprelik_old']    = $data;
    aprelik_redirect('/aprelik.php');
}

try {
    $pdo = aprelik_get_pdo();

    $sql = "
        INSERT INTO aprelik (
            child_last_name,
            child_first_name,
            child_birthdate,
            parent1_last_name,
            parent1_first_name,
            parent1_language,
            parent2_last_name,
            parent2_first_name,
            parent2_language,
            street_address,
            postal_code,
            city,
            parent1_phone,
            parent2_phone,
            email,
            consent_rgpd,
            consent_email_diffusion,
            ip_address,
            user_agent,
            school_day_address,
            age_group,
            notes
        ) VALUES (
            :child_last_name,
            :child_first_name,
            :child_birthdate,
            :parent1_last_name,
            :parent1_first_name,
            :parent1_language,
            :parent2_last_name,
            :parent2_first_name,
            :parent2_language,
            :street_address,
            :postal_code,
            :city,
            :parent1_phone,
            :parent2_phone,
            :email,
            :consent_rgpd,
            :consent_email_diffusion,
            :ip_address,
            :user_agent,
            :school_day_address,
            :age_group,
            :notes
        )
        ON DUPLICATE KEY UPDATE
            child_last_name = VALUES(child_last_name),
            child_first_name = VALUES(child_first_name),
            child_birthdate = VALUES(child_birthdate),
            parent1_last_name = VALUES(parent1_last_name),
            parent1_first_name = VALUES(parent1_first_name),
            parent1_language = VALUES(parent1_language),
            parent2_last_name = VALUES(parent2_last_name),
            parent2_first_name = VALUES(parent2_first_name),
            parent2_language = VALUES(parent2_language),
            street_address = VALUES(street_address),
            postal_code = VALUES(postal_code),
            city = VALUES(city),
            parent1_phone = VALUES(parent1_phone),
            parent2_phone = VALUES(parent2_phone),
            consent_rgpd = VALUES(consent_rgpd),
            consent_email_diffusion = VALUES(consent_email_diffusion),
            ip_address = VALUES(ip_address),
            user_agent = VALUES(user_agent),
            school_day_address = VALUES(school_day_address),
            age_group = VALUES(age_group),
            notes = VALUES(notes),
            updated_at = CURRENT_TIMESTAMP
    ";

    $stmt = $pdo->prepare($sql);
    $stmt->execute([
        ':child_last_name'         => $data['child_last_name'],
        ':child_first_name'        => $data['child_first_name'],
        ':child_birthdate'         => $data['child_birthdate'],
        ':parent1_last_name'       => $data['parent1_last_name'],
        ':parent1_first_name'      => $data['parent1_first_name'],
        ':parent1_language'        => $data['parent1_language'],
        ':parent2_last_name'       => $data['parent2_last_name'] !== '' ? $data['parent2_last_name'] : null,
        ':parent2_first_name'      => $data['parent2_first_name'] !== '' ? $data['parent2_first_name'] : null,
        ':parent2_language'        => $data['parent2_language'] !== '' ? $data['parent2_language'] : null,
        ':street_address'          => $data['street_address'],
        ':postal_code'             => $data['postal_code'],
        ':city'                    => $data['city'],
        ':parent1_phone'           => $data['parent1_phone'],
        ':parent2_phone'           => $data['parent2_phone'] !== '' ? $data['parent2_phone'] : null,
        ':email'                   => mb_strtolower($data['email']),
        ':consent_rgpd'            => $data['consent_rgpd'],
        ':consent_email_diffusion' => $data['consent_email_diffusion'],
        ':ip_address'              => substr((string) ($_SERVER['REMOTE_ADDR'] ?? ''), 0, 45) ?: null,
        ':user_agent'              => substr((string) ($_SERVER['HTTP_USER_AGENT'] ?? ''), 0, 255) ?: null,
        ':school_day_address'      => $data['school_day_address'],
        ':age_group'               => $data['age_group'],
        ':notes'                   => $data['notes'] !== '' ? $data['notes'] : null,
    ]);

    $_SESSION['aprelik_success'] = 'Спасибо. Ваша заявка сохранена.';
    aprelik_redirect('/aprelik.php');
} catch (Throwable $e) {
    $_SESSION['aprelik_errors'] = ['Произошла ошибка при сохранении формы.'];
    $_SESSION['aprelik_old']    = $data;
    aprelik_redirect('/aprelik.php');
}