export const MAX_SYNC_OFFSET_MS = 2000
export const SYNC_OFFSET_STEP_MS = 50

const toFiniteNumber = (value) => {
  const numericValue = Number(value ?? 0)
  return Number.isFinite(numericValue) ? numericValue : 0
}

export const clampSyncOffsetMs = (value, maxOffsetMs = MAX_SYNC_OFFSET_MS) => {
  const safeMax = Math.max(0, toFiniteNumber(maxOffsetMs))
  const safeValue = toFiniteNumber(value)
  return Math.min(safeMax, Math.max(-safeMax, safeValue))
}

export const snapSyncOffsetMs = (
  value,
  stepMs = SYNC_OFFSET_STEP_MS,
  maxOffsetMs = MAX_SYNC_OFFSET_MS
) => {
  const safeStep = Math.max(1, Math.round(toFiniteNumber(stepMs) || 1))
  const clampedValue = clampSyncOffsetMs(value, maxOffsetMs)
  return clampSyncOffsetMs(Math.round(clampedValue / safeStep) * safeStep, maxOffsetMs)
}

export const getSyncTrimMs = (syncOffsetMs = 0) => {
  const safeOffsetMs = clampSyncOffsetMs(syncOffsetMs)
  return {
    audioTrimMs: safeOffsetMs < 0 ? Math.abs(safeOffsetMs) : 0,
    videoTrimMs: safeOffsetMs > 0 ? safeOffsetMs : 0,
  }
}

export const getTimelinePositionMs = (audioPositionMs = 0, syncOffsetMs = 0) => {
  const { audioTrimMs } = getSyncTrimMs(syncOffsetMs)
  return Math.max(0, toFiniteNumber(audioPositionMs) - audioTrimMs)
}

export const getTimelineDurationMs = (audioDurationMs = 0, syncOffsetMs = 0) => {
  const { audioTrimMs } = getSyncTrimMs(syncOffsetMs)
  return Math.max(0, toFiniteNumber(audioDurationMs) - audioTrimMs)
}

export const getAudioPositionMs = (timelinePositionMs = 0, syncOffsetMs = 0) => {
  const { audioTrimMs } = getSyncTrimMs(syncOffsetMs)
  return Math.max(0, toFiniteNumber(timelinePositionMs) + audioTrimMs)
}

export const getVideoPositionMs = (timelinePositionMs = 0, syncOffsetMs = 0) => {
  const { videoTrimMs } = getSyncTrimMs(syncOffsetMs)
  return Math.max(0, toFiniteNumber(timelinePositionMs) + videoTrimMs)
}

export const formatSyncOffsetMs = (value) => {
  const safeValue = snapSyncOffsetMs(value)
  if (safeValue === 0) return '0 ms'
  return `${safeValue > 0 ? '+' : ''}${safeValue} ms`
}

export const toSyncOffsetSeconds = (value) => clampSyncOffsetMs(value) / 1000