interface AttendanceRecord {
  arrival_time?: string | null
  departure_time?: string | null
  break_start?: string | null
  break_end?: string | null
  leave_type?: string
  leave_hours?: number
  shift_date?: string
  notes?: string
  project_logs?: Array<{
    id?: number
    project_id?: number
    project_name?: string
    started_at?: string
    ended_at?: string | null
    hours?: string | number | null
    minutes?: string | number | null
  }>
}

export const formatDate = (dateStr: string | null | undefined): string => {
  if (!dateStr) return '—'
  const d = new Date(dateStr)
  return d.toLocaleDateString('cs-CZ')
}

export const formatDatetime = (datetime: string | null | undefined): string => {
  if (!datetime) return '—'
  const d = new Date(datetime)
  return `${d.getDate()}.${d.getMonth() + 1}. ${d.toLocaleTimeString('cs-CZ', { hour: '2-digit', minute: '2-digit' })}`
}

export const formatTime = (datetime: string | null | undefined): string => {
  if (!datetime) return '—'
  return new Date(datetime).toLocaleTimeString('cs-CZ', { hour: '2-digit', minute: '2-digit' })
}

export const calculateWorkMinutes = (record: AttendanceRecord): number => {
  if (!record.arrival_time || !record.departure_time) return 0
  const arrival = new Date(record.arrival_time).getTime()
  const departure = new Date(record.departure_time).getTime()
  let minutes = (departure - arrival) / 60000

  if (record.break_start && record.break_end) {
    const breakStart = new Date(record.break_start).getTime()
    const breakEnd = new Date(record.break_end).getTime()
    minutes -= (breakEnd - breakStart) / 60000
  }

  return Math.max(0, Math.floor(minutes))
}

export const formatMinutes = (minutes: number, withUnit = false): string => {
  const h = Math.floor(minutes / 60)
  const m = minutes % 60
  return `${h}:${String(m).padStart(2, '0')}${withUnit ? ' h' : ''}`
}

export const getLeaveTypeName = (type: string): string => {
  const types: Record<string, string> = {
    work: 'Práce',
    vacation: 'Dovolená',
    sick: 'Nemoc',
    holiday: 'Svátek',
    unpaid: 'Neplacené volno',
  }
  return types[type] || 'Práce'
}

export const getLeaveTypeBadgeClass = (type: string): string => {
  const classes: Record<string, string> = {
    vacation: 'badge-vacation',
    sick: 'badge-sick',
    holiday: 'badge-holiday',
    unpaid: 'badge-unpaid',
  }
  return classes[type] || ''
}

export const getDatePart = (datetime: string | null | undefined): string => {
  if (!datetime) return ''
  if (datetime.includes('T')) {
    return datetime.split('T')[0]
  }
  return datetime.split(' ')[0]
}

export const getTimePart = (datetime: string | null | undefined): string => {
  if (!datetime) return ''
  const d = new Date(datetime)
  return `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`
}

export const calcProjectMinutesTotal = (logs: Array<{ project_id?: number; hours?: string | number; minutes?: string | number }>): number => {
  return logs.filter(l => l.project_id).reduce((sum, l) => {
    return sum + (parseInt(String(l.hours)) || 0) * 60 + (parseInt(String(l.minutes)) || 0)
  }, 0)
}

interface ShiftForm {
  arrival_time?: string
  departure_time?: string
  arrival_date?: string
  departure_date?: string
  break_start_time?: string
  break_end_time?: string
  break_start_date?: string
  break_end_date?: string
}

export const calcFormWorkMinutes = (form: ShiftForm): number => {
  if (!form.arrival_time || !form.departure_time) return 0
  const arrivalStr = `${form.arrival_date}T${form.arrival_time}`
  const departureStr = `${form.departure_date}T${form.departure_time}`
  let mins = (new Date(departureStr).getTime() - new Date(arrivalStr).getTime()) / 60000
  if (form.break_start_time && form.break_end_time) {
    const bsStr = `${form.break_start_date}T${form.break_start_time}`
    const beStr = `${form.break_end_date}T${form.break_end_time}`
    mins -= (new Date(beStr).getTime() - new Date(bsStr).getTime()) / 60000
  }
  return Math.max(0, Math.floor(mins))
}

export const formatTimeOrDatetimePrint = (datetime: string | null | undefined, shiftDate: string): string => {
  if (!datetime) return '—'
  const timeDate = new Date(datetime).toISOString().split('T')[0]
  if (timeDate !== shiftDate) {
    const d = new Date(datetime)
    return `${d.getDate()}.${d.getMonth() + 1}. ${d.toLocaleTimeString('cs-CZ', { hour: '2-digit', minute: '2-digit' })}`
  }
  return new Date(datetime).toLocaleTimeString('cs-CZ', { hour: '2-digit', minute: '2-digit' })
}

export const calculateWorkMinutesPrint = (record: AttendanceRecord): number => {
  const leaveType = record.leave_type || 'work'
  if (leaveType !== 'work') {
    return (Number(record.leave_hours) || 8) * 60
  }
  if (!record.arrival_time || !record.departure_time) return 0
  const arrival = new Date(record.arrival_time).getTime()
  const departure = new Date(record.departure_time).getTime()
  let minutes = (departure - arrival) / 60000

  if (record.break_start && record.break_end) {
    const breakStart = new Date(record.break_start).getTime()
    const breakEnd = new Date(record.break_end).getTime()
    minutes -= (breakEnd - breakStart) / 60000
  }

  return Math.max(0, Math.floor(minutes))
}