// ntfy-style priority scale (docs/migration-ntfy.md) — reused here so a
// value already familiar to anyone migrating from ntfy behaves the way
// they'd expect: "min"/1 means "log it, don't buzz the phone."
const PRIORITY_ALIASES: Record<string, number> = {
  min: 1,
  low: 2,
  default: 3,
  high: 4,
  urgent: 5,
  max: 5,
}

const DEFAULT_PRIORITY = 3
const MIN_PRIORITY_NO_PUSH = 1

export function resolvePriority(raw: string | null | undefined): number {
  if (!raw) return DEFAULT_PRIORITY
  const trimmed = raw.trim().toLowerCase()
  // The `in` check above guarantees the key exists.
  if (trimmed in PRIORITY_ALIASES) return PRIORITY_ALIASES[trimmed]!
  const parsed = Number(trimmed)
  return Number.isFinite(parsed) ? parsed : DEFAULT_PRIORITY
}

// "min" priority notifications are stored and shown in-app like any other
// — they just don't trigger a push, so a noisy automation can stay in its
// normal topic instead of needing a dedicated quiet topic.
export function isQuietPriority(raw: string | null | undefined): boolean {
  return resolvePriority(raw) <= MIN_PRIORITY_NO_PUSH
}

// Household-wide "quiet hours" window (Admin > System) — true when `now`
// falls inside [start, end) in the given IANA timezone. Handles a window
// that wraps past midnight (e.g. 23:00-07:00) by checking OR instead of
// AND once start > end.
export function isWithinQuietHours(start: string, end: string, timezone: string, now = new Date()): boolean {
  const parts = new Intl.DateTimeFormat('en-GB', {
    timeZone: timezone,
    hour: '2-digit',
    minute: '2-digit',
    hourCycle: 'h23',
  }).formatToParts(now)
  const hour = Number(parts.find((p) => p.type === 'hour')?.value ?? '0')
  const minute = Number(parts.find((p) => p.type === 'minute')?.value ?? '0')
  const nowMinutes = hour * 60 + minute

  const [startH, startM] = start.split(':').map(Number)
  const [endH, endM] = end.split(':').map(Number)
  const startMinutes = (startH ?? 0) * 60 + (startM ?? 0)
  const endMinutes = (endH ?? 0) * 60 + (endM ?? 0)

  if (startMinutes === endMinutes) return false

  if (startMinutes < endMinutes) {
    return nowMinutes >= startMinutes && nowMinutes < endMinutes
  }
  return nowMinutes >= startMinutes || nowMinutes < endMinutes
}