// Human-readable date/time formatting shared across chrono components

export function formatTime(date: Date): string {
  return date.toLocaleTimeString('en-US', { hour: 'numeric', minute: '2-digit' })
}

export function formatEpochTime(timestamp: number): string {
  return formatTime(new Date(timestamp))
}

export function formatHour(hour: number): string {
  const ampm = hour >= 12 ? 'PM' : 'AM'
  const displayHour = hour % 12 || 12
  return `${displayHour} ${ampm}`
}

export function formatWeekDay(date: Date): string {
  return date.toLocaleDateString('en-US', { weekday: 'short' })
}

export function formatFullDate(date: Date | string): string {
  const value = date instanceof Date ? date : new Date(date)
  return value.toLocaleDateString('en-US', {
    weekday: 'long',
    year: 'numeric',
    month: 'long',
    day: 'numeric',
  })
}

// Local-time YYYY-MM-DD, for date input values
export function formatLocalIsoDate(date: Date): string {
  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}`
}

// Local-time HH:MM, for time input values
export function formatLocalIsoTime(date: Date): string {
  return date.toTimeString().slice(0, 5)
}

// "Jul 6, 2026" from a YYYY-MM-DD (or ISO) string
export function formatDisplayDate(value: string | null | undefined): string {
  if (!value) return ''
  return new Date(`${value.slice(0, 10)}T00:00:00`).toLocaleDateString(undefined, {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
  })
}

// "1:05 PM" from an HH:MM string
export function formatDisplayTime(value: string | null | undefined): string {
  if (!value) return ''
  const [hour, minute] = value.split(':').map(Number)
  const date = new Date()
  date.setHours(hour, minute, 0, 0)
  return date.toLocaleTimeString(undefined, { hour: 'numeric', minute: '2-digit' })
}