export type AlarmType = 'alarm' | 'natural' | 'awakened';

export interface SleepEntry {
  date: string;
  napped: boolean;
  napStart: string | null;
  napDurationMinutes: number | null;
  bedtime: string;
  sleepLatencyMinutes: number;
  awakenings: number;
  wasoMinutes: number;
  riseTime: string;
  alarmType: AlarmType;
  rating: number;
  notes: string;
  createdAt?: string;
  updatedAt?: string;
}

export interface SleepMetrics {
  timeInBedMinutes: number;
  totalSleepMinutes: number;
  efficiency: number;
}

export function calculateMetrics(entry: Pick<SleepEntry, 'bedtime' | 'riseTime' | 'sleepLatencyMinutes' | 'wasoMinutes'>): SleepMetrics {
  const [bedHours, bedMinutes] = entry.bedtime.split(':').map(Number);
  const [riseHours, riseMinutes] = entry.riseTime.split(':').map(Number);
  let timeInBedMinutes = riseHours * 60 + riseMinutes - (bedHours * 60 + bedMinutes);

  if (timeInBedMinutes <= 0) timeInBedMinutes += 24 * 60;

  const totalSleepMinutes = Math.max(0, timeInBedMinutes - entry.sleepLatencyMinutes - entry.wasoMinutes);
  const efficiency = timeInBedMinutes === 0 ? 0 : Math.round((totalSleepMinutes / timeInBedMinutes) * 100);

  return { timeInBedMinutes, totalSleepMinutes, efficiency };
}

export function formatDuration(minutes: number): string {
  const hours = Math.floor(minutes / 60);
  const remainder = minutes % 60;
  return hours > 0 ? `${hours} ч ${remainder.toString().padStart(2, '0')} мин` : `${remainder} мин`;
}

export const defaultEntry = (date: string): SleepEntry => ({
  date,
  napped: false,
  napStart: null,
  napDurationMinutes: null,
  bedtime: '23:30',
  sleepLatencyMinutes: 20,
  awakenings: 0,
  wasoMinutes: 0,
  riseTime: '07:00',
  alarmType: 'natural',
  rating: 3,
  notes: '',
});