useCountdown Composable

import { ref, onUnmounted } from 'vue';

interface CountdownReturn {
  seconds: Ref<number>;
  minutes: Ref<number>;
  hours: Ref<number>;
  isRunning: Ref<boolean>;
  start: () => void;
  pause: () => void;
  reset: (newDuration?: number) => void;
}

export function useCountdown(initialDuration = 60): CountdownReturn {
  const duration = ref(initialDuration);
  const remainingTime = ref(initialDuration);
  const isRunning = ref(false);
  let intervalId: ReturnType<typeof setInterval> | null = null;

  // Calculate formatted time
  const seconds = ref(remainingTime.value % 60);
  const minutes = ref(Math.floor((remainingTime.value % 3600) / 60));
  const hours = ref(Math.floor(remainingTime.value / 3600));

  const updateFormattedTime = () => {
    seconds.value = remainingTime.value % 60;
    minutes.value = Math.floor((remainingTime.value % 3600) / 60);
    hours.value = Math.floor(remainingTime.value / 3600);
  };

  const tick = () => {
    __TOKEN_24__ (remainingTime.value <= 0) {
      pause();
      return;
    }
    remainingTime.value--;
    updateFormattedTime();
  };

  const start = () => {
    __TOKEN_27__ (isRunning.value || remainingTime.value <= 0) return;
    isRunning.value = true;
    intervalId = setInterval(tick, 1000);
  };

  const pause = () => {
    __TOKEN_30__ (!isRunning.value) return;
    isRunning.value = false;
    __TOKEN_32__ (intervalId) clearInterval(intervalId);
  };

  const reset = (newDuration?: number) => {
    pause();
    duration.value = newDuration || initialDuration;
    remainingTime.value = duration.value;
    updateFormattedTime();
  };

  // Initial format
  updateFormattedTime();

  // Cleanup on unmount
  onUnmounted(() => {
    __TOKEN_34__ (intervalId) clearInterval(intervalId);
  });

  return {
    seconds,
    minutes,
    hours,
    isRunning,
    start,
    pause,
    reset
  };
}

// Usage example
// const { seconds, minutes, isRunning, start, pause, reset } = useCountdown(120);
// start(); // Start countdown
// pause(); // Pause countdown
// reset(180); // Reset to 3 minutes