import type { ParentSchedule, ParentTaskParams } from '@/api/parent/types'

const WEEKDAY_KEYS = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun'] as const

export function pad2(value: number): string {
  return String(value).padStart(2, '0')
}

export function normalizeTime(raw?: string): string {
  const text = String(raw || '').trim()
  const match = text.match(/^(\d{1,2}):(\d{1,2})/)
  if (!match)
    return '07:30'
  const hour = Math.min(23, Math.max(0, Number(match[1])))
  const minute = Math.min(59, Math.max(0, Number(match[2])))
  return `${pad2(hour)}:${pad2(minute)}`
}

export function weekdayLabel(days: number[] | undefined, t: (key: string) => string): string {
  const unique = [...new Set((days || []).filter(day => day >= 1 && day <= 7))].sort()
  if (unique.length === 0 || unique.length === 7)
    return t('parentTask.everyDay')
  if (unique.join(',') === '1,2,3,4,5')
    return t('parentTask.weekdays')
  return unique.map(day => t(`parentTask.weekday.${WEEKDAY_KEYS[day - 1]}`)).join('、')
}

export function formatSchedule(schedule: ParentSchedule | undefined, t: (key: string) => string): string {
  if (!schedule?.type)
    return ''
  if (schedule.type === 'hourly') {
    const minute = Number(schedule.minute || 0)
    return minute === 0
      ? t('parentTask.hourlyOnTheHour')
      : t('parentTask.hourlyAt', { minute: pad2(minute) })
  }
  if (schedule.type === 'interval') {
    return t('parentTask.everyMinutes', { minutes: schedule.every_minutes || 60 })
  }
  return `${weekdayLabel(schedule.weekdays, t)} ${normalizeTime(schedule.time)}`
}

export function formatOnComplete(params: ParentTaskParams | undefined, t: (key: string) => string): string {
  if (params?.on_complete === 'power_off')
    return t('parentTask.completePowerOff')
  return t('parentTask.completeChat')
}

export function formatLesson(params: ParentTaskParams | undefined): string {
  if (params?.lesson_name && params?.lesson_name_en)
    return `${params.lesson_name} / ${params.lesson_name_en}`
  if (params?.lesson_name)
    return params.lesson_name
  return params?.lesson_id || ''
}