import '../../../../../access/user_role.dart';
import '../../../../../api/marianumconnect/queries/timetable_get_element_week/timetable_element_type.dart';
import '../../capabilities/bloc/capabilities_state.dart';
import '../subject/timetable_subject.dart';

/// What the timetable view offers for a given subject. Resolved in one place
/// so the view never branches on roles or subject types itself.
class TimetablePolicy {
  final bool canManageCustomEvents;
  final bool canEditSubjectColors;
  final bool showClassInsteadOfTeacher;
  final bool canOpenForeign;

  const TimetablePolicy({
    required this.canManageCustomEvents,
    required this.canEditSubjectColors,
    required this.showClassInsteadOfTeacher,
    required this.canOpenForeign,
  });

  static TimetablePolicy resolve({
    required TimetableSubject subject,
    required CapabilitiesState capabilities,
  }) => switch (subject) {
    OwnTimetable() => TimetablePolicy(
      canManageCustomEvents: true,
      canEditSubjectColors: true,
      showClassInsteadOfTeacher: capabilities.role == UserRole.teacher,
      canOpenForeign: capabilities.viewForeignTimetables,
    ),
    // Subject colours are the viewer's own, global setting; editing them from
    // a foreign plan would not refresh that plan, so it is not offered there.
    ElementTimetable(:final element) => TimetablePolicy(
      canManageCustomEvents: false,
      canEditSubjectColors: false,
      showClassInsteadOfTeacher: element.type == TimetableElementType.teacher,
      canOpenForeign: capabilities.viewForeignTimetables,
    ),
    // Custom events are the child's private data; subject colours are the
    // guardian's own and apply to this (primary) plan directly.
    ChildTimetable() => TimetablePolicy(
      canManageCustomEvents: false,
      canEditSubjectColors: true,
      showClassInsteadOfTeacher: false,
      canOpenForeign: capabilities.viewForeignTimetables,
    ),
    NoTimetable() => const TimetablePolicy(
      canManageCustomEvents: false,
      canEditSubjectColors: false,
      showClassInsteadOfTeacher: false,
      canOpenForeign: false,
    ),
  };
}