import 'package:professional_repository/professional_repository.dart';
import 'package:prosappco/utils/time_of_day_extension.dart';

const _dayNames = [
  'Lunes',
  'Martes',
  'Miércoles',
  'Jueves',
  'Viernes',
  'Sábado',
  'Domingo',
];

/// Human-readable problems with a week of opening hours, empty when it is fine.
///
/// Nothing validated these before: an inverted or half-filled day saved
/// happily and then produced zero bookable slots, with no clue as to why.
List<String> validateSchedules(Schedules schedules) {
  final days = [
    schedules.monday,
    schedules.tuesday,
    schedules.wednesday,
    schedules.thursday,
    schedules.friday,
    schedules.saturday,
    schedules.sunday,
  ];

  final problems = <String>[];
  for (var i = 0; i < days.length; i++) {
    final problem = _validateDay(days[i]);
    if (problem != null) problems.add('${_dayNames[i]}: $problem');
  }
  return problems;
}

String? _validateDay(ScheduleEntity day) {
  if (!day.enabled) return null;

  if (day.continuousDay) {
    if (day.range1Hour1 == null || day.range2Hour2 == null) {
      return 'falta la hora de apertura o de cierre';
    }
    if (!day.range1Hour1!.isBefore(day.range2Hour2!)) {
      return 'la hora de cierre debe ser posterior a la de apertura';
    }
    return null;
  }

  final r = [day.range1Hour1, day.range1Hour2, day.range2Hour1, day.range2Hour2];
  if (r.any((t) => t == null)) {
    return 'faltan horas en la jornada partida';
  }
  if (!r[0]!.isBefore(r[1]!)) {
    return 'la primera jornada termina antes de empezar';
  }
  if (!r[2]!.isBefore(r[3]!)) {
    return 'la segunda jornada termina antes de empezar';
  }
  if (r[2]!.isBefore(r[1]!)) {
    return 'las dos jornadas se cruzan';
  }
  return null;
}