/**
 * 日期时间组合函数
 * 提供日期格式化、倒计时等与日期时间相关的可复用逻辑
 */
import { ref, computed, onUnmounted } from 'vue';
import { formatDate } from '@/utils/helper';

/**
 * 格式化日期时间的组合函数
 * @param {Object} options - 配置选项
 * @param {string} options.format - 日期格式
 * @returns {Object} - 包含格式化方法的对象
 */
export const useDateTime = (options = {}) => {
  const { format = 'yyyy-MM-dd HH:mm:ss' } = options;

  /**
   * 格式化日期
   * @param {Date|string|number} date - 日期值
   * @param {string} customFormat - 自定义格式
   * @returns {string} - 格式化后的日期字符串
   */
  const formatDateTime = (date, customFormat) => {
    return formatDate(date, customFormat || format);
  };

  /**
   * 获取当前时间
   * @returns {Date} - 当前日期对象
   */
  const getCurrentTime = () => {
    return new Date();
  };

  /**
   * 获取当前格式化时间
   * @param {string} customFormat - 自定义格式
   * @returns {string} - 格式化后的当前时间
   */
  const getCurrentFormattedTime = (customFormat) => {
    return formatDateTime(getCurrentTime(), customFormat);
  };

  return {
    formatDateTime,
    getCurrentTime,
    getCurrentFormattedTime
  };
};

/**
 * 实时时钟组合函数
 * @param {string} format - 日期格式
 * @returns {Object} - 包含当前时间和停止时钟的方法
 */
export const useClock = (format = 'yyyy-MM-dd HH:mm:ss') => {
  const currentTime = ref(getCurrentFormattedTime());
  let timer = null;

  // 获取当前格式化时间
  function getCurrentFormattedTime() {
    return formatDate(new Date(), format);
  }

  // 启动时钟
  const startClock = () => {
    if (timer) clearInterval(timer);
    timer = setInterval(() => {
      currentTime.value = getCurrentFormattedTime();
    }, 1000);
  };

  // 停止时钟
  const stopClock = () => {
    if (timer) {
      clearInterval(timer);
      timer = null;
    }
  };

  // 组件卸载时停止时钟
  onUnmounted(stopClock);

  // 初始启动时钟
  startClock();

  return {
    currentTime: computed(() => currentTime.value),
    startClock,
    stopClock
  };
};

/**
 * 倒计时组合函数
 * @param {number} targetTime - 目标时间戳（毫秒）
 * @returns {Object} - 包含倒计时数据和控制方法
 */
export const useCountdown = (targetTime) => {
  const days = ref(0);
  const hours = ref(0);
  const minutes = ref(0);
  const seconds = ref(0);
  const isCompleted = ref(false);
  let timer = null;

  // 计算倒计时
  const calculateCountdown = () => {
    const now = new Date().getTime();
    const difference = targetTime - now;

    if (difference <= 0) {
      days.value = 0;
      hours.value = 0;
      minutes.value = 0;
      seconds.value = 0;
      isCompleted.value = true;
      stopCountdown();
      return;
    }

    days.value = Math.floor(difference / (1000 * 60 * 60 * 24));
    hours.value = Math.floor((difference % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
    minutes.value = Math.floor((difference % (1000 * 60 * 60)) / (1000 * 60));
    seconds.value = Math.floor((difference % (1000 * 60)) / 1000);
  };

  // 启动倒计时
  const startCountdown = () => {
    if (timer) clearInterval(timer);
    calculateCountdown();
    timer = setInterval(calculateCountdown, 1000);
  };

  // 停止倒计时
  const stopCountdown = () => {
    if (timer) {
      clearInterval(timer);
      timer = null;
    }
  };

  // 重置倒计时
  const resetCountdown = (newTargetTime) => {
    if (newTargetTime) {
      targetTime = newTargetTime;
    }
    isCompleted.value = false;
    startCountdown();
  };

  // 组件卸载时停止倒计时
  onUnmounted(stopCountdown);

  // 初始启动倒计时
  startCountdown();

  return {
    days: computed(() => days.value),
    hours: computed(() => hours.value),
    minutes: computed(() => minutes.value),
    seconds: computed(() => seconds.value),
    isCompleted: computed(() => isCompleted.value),
    startCountdown,
    stopCountdown,
    resetCountdown
  };
};

// 默认导出主要的日期时间组合函数
export default useDateTime;