/** Formatting helpers for chat timeline + customer list. */

/** ms-epoch → `YYYY-MM-DD HH:mm:ss` in local time. `--` for missing/invalid. */
export function formatTime(ts?: number | null): string {
  if (!ts || !Number.isFinite(ts) || ts <= 0) return '--'
  const d = new Date(ts)
  if (Number.isNaN(d.getTime())) return '--'
  const pad = (n: number) => String(n).padStart(2, '0')
  return (
    `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())} ` +
    `${pad(d.getHours())}:${pad(d.getMinutes())}:${pad(d.getSeconds())}`
  )
}

/** ms-epoch → short `MM-DD HH:mm` for dense timelines. */
export function formatTimeShort(ts?: number | null): string {
  if (!ts || !Number.isFinite(ts) || ts <= 0) return ''
  const d = new Date(ts)
  if (Number.isNaN(d.getTime())) return ''
  const pad = (n: number) => String(n).padStart(2, '0')
  return `${pad(d.getMonth() + 1)}-${pad(d.getDate())} ${pad(d.getHours())}:${pad(d.getMinutes())}`
}

/**
 * For voice messages the backend stores duration in seconds (best-effort).
 * Render as `N"` or `M'SS"` to mirror the messaging-app look.
 */
export function formatDuration(seconds?: number | null): string {
  if (!seconds || !Number.isFinite(seconds) || seconds <= 0) return ''
  const s = Math.round(seconds)
  if (s < 60) return `${s}"`
  const m = Math.floor(s / 60)
  const rem = s % 60
  return `${m}'${String(rem).padStart(2, '0')}"`
}

/** Friendly label for a Channel value. */
export function channelLabel(channel?: string | null): string {
  switch (channel) {
    case 'wechat':
      return '微信'
    case 'whatsapp':
      return 'WhatsApp'
    default:
      return channel ?? '未知'
  }
}

// ---------------------------------------------------------------------------
// Phone / voice call rendering
// ---------------------------------------------------------------------------

/** Call-type (PhoneCall.channel) label — 电话 vs 语音通话. */
export function callTypeLabel(channel?: string | null): string {
  switch (channel) {
    case 'phone_call':
      return '电话'
    case 'voice_call':
      return '语音通话'
    default:
      return channel ?? '未知'
  }
}

/** Call direction. ``incoming_call``: 1 = 呼入 (incoming), 0 = 呼出 (outgoing). */
export function callDirectionLabel(incoming?: number | null): string {
  if (incoming == null) return '--'
  return incoming === 1 ? '呼入' : '呼出'
}

/**
 * Call status. The upstream schema uses 1 = 已接通 (answered/connected) and
 * 0 = 未接通 (missed/failed); other codes fall back to the raw value so the UI
 * never hides information.
 */
export function callStatusLabel(status?: number | null): string {
  if (status == null) return '--'
  switch (status) {
    case 1:
      return '已接通'
    case 0:
      return '未接通'
    default:
      return `状态 ${status}`
  }
}

/** Render call_duration (seconds) as `N"s` / `M'SS"`; ``--`` when missing. */
export function formatCallDuration(seconds?: number | null): string {
  if (!seconds || !Number.isFinite(seconds) || seconds <= 0) return '--'
  return formatDuration(seconds)
}

// ---------------------------------------------------------------------------
// SMS rendering
// ---------------------------------------------------------------------------

/**
 * SMS direction. Conventions: ``direction`` 1 = 发送 (outbound, staff →
 * customer), 0 = 接收 (inbound). Other values fall back to the raw code.
 */
export function smsDirectionLabel(direction?: number | null): string {
  if (direction == null) return '--'
  switch (direction) {
    case 1:
      return '发送'
    case 0:
      return '接收'
    default:
      return `方向 ${direction}`
  }
}