System rejestracji wizyt

{
  "appointments": [
    {
      "id": 1,
      "person_name": "Jan Kowalski",
      "contact": "jan.kowalski@email.pl",
      "phone": "123456789",
      "service": "konsultacja",
      "date": "2026-02-15",
      "time": "10:00",
      "notes": "Pierwsza wizyta",
      "status": "confirmed",
      "created_at": "2026-02-10 14:30:00"
    },
    {
      "id": 2,
      "person_name": "Anna Nowak",
      "contact": "anna.nowak@email.pl",
      "phone": "987654321",
      "service": "badanie",
      "date": "2026-02-15",
      "time": "11:00",
      "notes": "",
      "status": "pending",
      "created_at": "2026-02-11 09:15:00"
    }
  ]
}

$date = $_POST['date'] ?? '';
$time = $_POST['time'] ?? '';
$today = date('Y-m-d');

// Data nie może być z przeszłości
if ($date < $today) {
    $errors[] = "Data nie może być z przeszłości";
}

// Walidacja formatu godziny (HH:MM)
if (!preg_match('/^([01]?[0-9]|2[0-3]):[0-5][0-9]$/', $time)) {
    $errors[] = "Nieprawidłowy format godziny (użyj HH:MM)";
}

// Godziny pracy (np. 8:00 - 18:00)
$hour = (int) explode(':', $time)[0];
if ($hour < 8 || $hour >= 18) {
    $errors[] = "Wizyty możliwe tylko w godzinach 8:00 - 18:00";
}

function isTimeSlotAvailable(array $appointments, string $date, string $time, int $duration = 60): bool {
    $requestedStart = strtotime("$date $time");
    $requestedEnd = $requestedStart + ($duration * 60);

    foreach ($appointments as $appointment) {
        if ($appointment['date'] !== $date) {
            continue;
        }

        $existingStart = strtotime("{$appointment['date']} {$appointment['time']}");
        $existingEnd = $existingStart + ($duration * 60);

        // Sprawdź czy terminy się nakładają
        if ($requestedStart < $existingEnd && $requestedEnd > $existingStart) {
            return false;
        }
    }

    return true;
}

// Znajdź dostępne godziny
function getAvailableSlots(array $appointments, string $date, int $startHour = 8, int $endHour = 18): array {
    $available = [];

    for ($hour = $startHour; $hour < $endHour; $hour++) {
        $time = sprintf('%02d:00', $hour);
        if (isTimeSlotAvailable($appointments, $date, $time)) {
            $available[] = $time;
        }
    }

    return $available;
}

function addAppointment(array &$appointments, array $data): int {
    $newId = empty($appointments) ? 1 : max(array_column($appointments, 'id')) + 1;

    $newAppointment = [
        'id' => $newId,
        'person_name' => $data['person_name'],
        'contact' => $data['contact'],
        'phone' => $data['phone'] ?? '',
        'service' => $data['service'],
        'date' => $data['date'],
        'time' => $data['time'],
        'notes' => $data['notes'] ?? '',
        'status' => 'pending',
        'created_at' => date('Y-m-d H:i:s'),
    ];

    $appointments[] = $newAppointment;
    return $newId;
}

function filterByDate(array $appointments, string $date): array {
    return array_filter($appointments, fn($a) => $a['date'] === $date);
}

function filterByDateRange(array $appointments, string $from, string $to): array {
    return array_filter($appointments, function($a) use ($from, $to) {
        return $a['date'] >= $from && $a['date'] <= $to;
    });
}

function filterByStatus(array $appointments, string $status): array {
    return array_filter($appointments, fn($a) => $a['status'] === $status);
}

function sortAppointments(array $appointments): array {
    usort($appointments, function($a, $b) {
        $dateCompare = strcmp($a['date'], $b['date']);
        if ($dateCompare !== 0) {
            return $dateCompare;
        }
        return strcmp($a['time'], $b['time']);
    });

    return $appointments;
}

function getServices(): array {
    return [
        'konsultacja' => ['label' => 'Konsultacja', 'duration' => 30, 'price' => 100],
        'badanie' => ['label' => 'Badanie', 'duration' => 60, 'price' => 200],
        'zabieg' => ['label' => 'Zabieg', 'duration' => 90, 'price' => 350],
        'kontrola' => ['label' => 'Wizyta kontrolna', 'duration' => 15, 'price' => 50],
    ];
}

function validateAppointmentForm() {
    const name = document.getElementById('person_name').value.trim();
    const contact = document.getElementById('contact').value.trim();
    const date = document.getElementById('date').value;
    const time = document.getElementById('time').value;
    const errors = [];

    if (name.length < 2) {
        errors.push('Podaj imię i nazwisko');
    }

    if (!contact.includes('@')) {
        errors.push('Podaj poprawny email');
    }

    const today = new Date().toISOString().split('T')[0];
    if (date < today) {
        errors.push('Data nie może być z przeszłości');
    }

    if (!time) {
        errors.push('Wybierz godzinę');
    }

    if (errors.length > 0) {
        alert(errors.join('\n'));
        return false;
    }

    return true;
}