let timerId: ReturnType<typeof setInterval> | null = null
let startTime: number = 0

// 开始计时器
function startPosityveTimer(callback: (timeString: string) => void) {
  if (timerId) {
    return
  }
  startTime = Date.now()
  timerId = setInterval(() => {
    if (callback) {
      callback(formatTime())
    }
  }, 1000)
}
// 停止计时器
function stopPosityveTimer() {
  if (timerId) {
    clearInterval(timerId)
    timerId = null
  }
}
// 格式化时间为 HH:MM:SS
function formatTime() {
  if (!startTime) {
    return '00:00:00'
  }
  const totalSeconds = Math.floor((Date.now() - startTime) / 1000)
  const hours = Math.floor(totalSeconds / 3600)
  const minutes = Math.floor((totalSeconds % 3600) / 60)
  const seconds = totalSeconds % 60
  return [
    padZero(hours),
    padZero(minutes),
    padZero(seconds),
  ].join(':')
}

// 数字补零
function padZero(num: number) {
  return num < 10 ? `0${num}` : `${num}`
}

export {
  startPosityveTimer,
  stopPosityveTimer,
}