enum ShiftStatus { open, booked, active, completed, cancelled, noShow }

extension ShiftStatusX on ShiftStatus {
  String get label => switch (this) {
    ShiftStatus.open => 'Open',
    ShiftStatus.booked => 'Confirmed',
    ShiftStatus.active => 'In progress',
    ShiftStatus.completed => 'Completed',
    ShiftStatus.cancelled => 'Cancelled',
    ShiftStatus.noShow => 'No show',
  };
}

class Shift {
  Shift({
    required this.id,
    required this.role,
    required this.business,
    required this.venue,
    required this.address,
    required this.start,
    required this.end,
    required this.rate,
    required this.status,
    this.breakMinutes = 30,
    this.distanceMiles = 2.4,
    this.manager,
    this.clockIn,
    this.clockOut,
    this.requirements = const [],
  });

  final String id;
  final String role;
  final String business;
  final String venue;
  final String address;
  final DateTime start;
  final DateTime end;
  final double rate;
  final ShiftStatus status;
  final int breakMinutes;
  final double distanceMiles;
  final String? manager;
  final DateTime? clockIn;
  final DateTime? clockOut;
  final List<String> requirements;

  /// Paid duration: the scheduled window less the unpaid break.
  Duration get scheduledDuration =>
      end.difference(start) - Duration(minutes: breakMinutes);

  /// What was actually worked, once clocked out.
  Duration? get workedDuration {
    if (clockIn == null || clockOut == null) return null;
    final d = clockOut!.difference(clockIn!) - Duration(minutes: breakMinutes);
    return d.isNegative ? Duration.zero : d;
  }

  double get scheduledPay => rate * scheduledDuration.inMinutes / 60;

  /// Gross, pre-tax. Falls back to the scheduled figure until clocked out.
  double get pay {
    if (status == ShiftStatus.cancelled || status == ShiftStatus.noShow) {
      return 0;
    }
    final worked = workedDuration;
    if (worked != null) return rate * worked.inMinutes / 60;
    return scheduledPay;
  }

  String get logoLetter => business.isEmpty ? '?' : business[0].toUpperCase();

  Shift copyWith({
    ShiftStatus? status,
    DateTime? clockIn,
    DateTime? clockOut,
  }) => Shift(
    id: id,
    role: role,
    business: business,
    venue: venue,
    address: address,
    start: start,
    end: end,
    rate: rate,
    status: status ?? this.status,
    breakMinutes: breakMinutes,
    distanceMiles: distanceMiles,
    manager: manager,
    clockIn: clockIn ?? this.clockIn,
    clockOut: clockOut ?? this.clockOut,
    requirements: requirements,
  );
}