export interface ScheduleVisibilityRange {
  startAt: Date | null
  endAt: Date | null
}

export interface VisibilitySettingsLike {
  scheduleDaysBeforeEnabled?: boolean | null
  scheduleDaysBefore?: number | null
  scheduleDaysAfterEnabled?: boolean | null
  scheduleDaysAfter?: number | null
}

export function resolveScheduleVisibilityRange(
  settings: VisibilitySettingsLike | null | undefined,
  referenceDate = new Date()
): ScheduleVisibilityRange {
  const today = new Date(
    referenceDate.getFullYear(),
    referenceDate.getMonth(),
    referenceDate.getDate()
  )

  let startAt: Date | null = null
  let endAt: Date | null = null

  if (settings?.scheduleDaysBeforeEnabled) {
    const days = Math.max(0, Number(settings.scheduleDaysBefore) || 0)
    const d = new Date(today)
    d.setDate(d.getDate() - days)
    startAt = d
  }

  if (settings?.scheduleDaysAfterEnabled) {
    const days = Math.max(0, Number(settings.scheduleDaysAfter) || 0)
    const d = new Date(today)
    d.setDate(d.getDate() + days + 1)
    endAt = d
  }

  return { startAt, endAt }
}

export function isPlayDateInRange(
  playDate: Date | string | null | undefined,
  range: ScheduleVisibilityRange
): boolean {
  if (!playDate) return true
  const d = new Date(playDate)
  if (range.startAt && d.getTime() < range.startAt.getTime()) return false
  if (range.endAt && d.getTime() >= range.endAt.getTime()) return false
  return true
}