const monthsInId = [
  'Januari',
  'Februari',
  'Maret',
  'April',
  'Mei',
  'Juni',
  'Juli',
  'Agustus',
  'September',
  'Oktober',
  'November',
  'Desember',
]

export function getAge(dateString: string, comparedDate?: string): { idFormat: string; extFormat: string } {
  const birthDate = new Date(dateString)
  const today = new Date()

  if (comparedDate) {
    const comparedDateObj = new Date(comparedDate)
    today.setFullYear(comparedDateObj.getFullYear())
    today.setMonth(comparedDateObj.getMonth())
    today.setDate(comparedDateObj.getDate())
  }

  // Format the date part
  const options: Intl.DateTimeFormatOptions = { day: 'numeric', month: 'long', year: 'numeric' }
  const idFormat = birthDate.toLocaleDateString('id-ID', options)

  // Calculate age
  let years = today.getFullYear() - birthDate.getFullYear()
  let months = today.getMonth() - birthDate.getMonth()
  let days = today.getDate() - birthDate.getDate()

  if (months < 0 || (months === 0 && days < 0)) {
    years--
    months += 12
  }

  if (days < 0) {
    const prevMonth = new Date(today.getFullYear(), today.getMonth() - 1, 0)
    days += prevMonth.getDate()
    months--
  }

  // Format the age part
  let extFormat = ''
  if ([years, months, days].filter(Boolean).join(' ')) {
    extFormat = `${years} Tahun ${months} Bulan ${days} Hari`
  } else {
    extFormat = '0'
  }

  return {
    idFormat,
    extFormat,
  }
}

// Date selection: default to today - today
export function getFormatDateId(date: Date) {
  const dd = String(date.getDate()).padStart(2, '0')
  const mm = monthsInId[date.getMonth()]
  const yyyy = date.getFullYear()
  return `${dd} ${mm} ${yyyy}`
}

export function formatDateYyyyMmDd(isoDateString: string): string {
	const date = new Date(isoDateString);
	const year = date.getFullYear();
	const month = String(date.getMonth() + 1).padStart(2, '0');
	const day = String(date.getDate()).padStart(2, '0');
	return `${year}-${month}-${day}`;
}

// Function to check if date is invalid (like "0001-01-01T00:00:00Z")
export function isValidDate(dateString: string | null | undefined): boolean {
  if (!dateString) return false
  // Check for invalid date patterns
  if (dateString.startsWith('0001-01-01')) return false
  try {
    const date = new Date(dateString)
    return !isNaN(date.getTime())
  } catch {
    return false
  }
}