import { ref, computed } from 'vue';

/**
 * 秒表计时器
 */
export function useTimer() {
  let interval;
  const count = ref(0);
  const running = ref(false);
  const time = computed(() => {
    const hour = Math.floor(count.value / 3600);
    const min = Math.floor((count.value - hour * 3600) / 60);
    const sec = Math.floor(count.value - hour * 3600 - min * 60);

    return `${hour.toString().padStart(2, '0')}:${min.toString().padStart(2, '0')}:${sec
      .toString()
      .padStart(2, '0')}`;
  });

  function startTimer() {
    if (!running.value) {
      interval = setInterval(() => {
        count.value++;
      }, 1000);
      running.value = true 
    }
  }

  function pauseTimer() {
    if (interval) {
      clearInterval(interval);
    }
    running.value = false
  }

  function stopTimer() {
    pauseTimer();
    count.value = 0;
  }

  return { time, startTimer, pauseTimer, stopTimer, running, count };
}