import '../../../../../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';

/// Whose timetable a [TimetableBloc] shows. The render pipeline is identical
/// for every subject; only the week endpoint, persistence and the
/// user-private extras (custom events) differ.
sealed class TimetableSubject {
  const TimetableSubject();

  /// Suffix of the hydrated storage slot. Must be unique per subject so
  /// subjects never overwrite each other's cached weeks.
  String get storageId;

  /// Whether the bloc keeps its state across app restarts.
  bool get persistent;

  /// Custom events are user-private and only exist for the own plan.
  bool get supportsCustomEvents;
}

/// The signed-in user's own plan (`timetable/me`).
final class OwnTimetable extends TimetableSubject {
  const OwnTimetable();

  // Empty on purpose: keeps the pre-existing storage slot "TimetableBloc", so
  // updating the app does not drop the cached weeks.
  @override
  String get storageId => '';

  @override
  bool get persistent => true;

  @override
  bool get supportsCustomEvents => true;

  @override
  bool operator ==(Object other) => other is OwnTimetable;

  @override
  int get hashCode => (OwnTimetable).hashCode;
}

/// A foreign element picked by the user (teacher, room, class, student).
final class ElementTimetable extends TimetableSubject {
  final TimetableElementRef element;

  const ElementTimetable(this.element);

  @override
  String get storageId => 'element-${element.type.name}-${element.id}';

  @override
  bool get persistent => false;

  @override
  bool get supportsCustomEvents => false;

  @override
  bool operator ==(Object other) =>
      other is ElementTimetable &&
      other.element.type == element.type &&
      other.element.id == element.id;

  @override
  int get hashCode => Object.hash(element.type, element.id);
}

/// A guardian's child (`timetable/child/{id}`). Kept across restarts per
/// child, so switching between siblings shows the cached plan immediately.
final class ChildTimetable extends TimetableSubject {
  final String childId;

  const ChildTimetable(this.childId);

  @override
  String get storageId => 'child-$childId';

  @override
  bool get persistent => true;

  @override
  bool get supportsCustomEvents => false;

  @override
  bool operator ==(Object other) =>
      other is ChildTimetable && other.childId == childId;

  @override
  int get hashCode => childId.hashCode;
}

/// No plan to show: signed out, or a guardian without (known) children. The
/// bloc loads nothing; the view explains why.
final class NoTimetable extends TimetableSubject {
  const NoTimetable();

  @override
  String get storageId => 'none';

  @override
  bool get persistent => false;

  @override
  bool get supportsCustomEvents => false;

  @override
  bool operator ==(Object other) => other is NoTimetable;

  @override
  int get hashCode => (NoTimetable).hashCode;
}