import type { Arrayable, MaybeElementRef } from '@vueuse/core';

import type { Ref } from 'vue';

import { computed, onUnmounted, ref, unref, watch } from 'vue';

import { isFunction } from '@vben/utils';

import { useElementHover } from '@vueuse/core';

interface HoverDelayOptions {
  /** 鼠标进入延迟时间 */
  enterDelay?: (() => number) | number;
  /** 鼠标离开延迟时间 */
  leaveDelay?: (() => number) | number;
}

const DEFAULT_LEAVE_DELAY = 500; // 鼠标离开延迟时间，默认为 500ms
const DEFAULT_ENTER_DELAY = 0; // 鼠标进入延迟时间，默认为 0（立即响应）

/**
 * 监测鼠标是否在元素内部，如果在元素内部则返回 true，否则返回 false
 * @param refElement 所有需要检测的元素。如果提供了一个数组，那么鼠标在任何一个元素内部都会返回 true
 * @param delay 延迟更新状态的时间，可以是数字或包含进入/离开延迟的配置对象
 * @returns 返回一个数组，第一个元素是一个 ref，表示鼠标是否在元素内部，第二个元素是一个控制器，可以通过 enable 和 disable 方法来控制监听器的启用和禁用
 */
export function useHoverToggle(
  refElement: Arrayable<MaybeElementRef>,
  delay: (() => number) | HoverDelayOptions | number = DEFAULT_LEAVE_DELAY,
) {
  // 兼容旧版本API
  const normalizedOptions: HoverDelayOptions =
    typeof delay === 'number' || isFunction(delay)
      ? { enterDelay: DEFAULT_ENTER_DELAY, leaveDelay: delay }
      : {
          enterDelay: DEFAULT_ENTER_DELAY,
          leaveDelay: DEFAULT_LEAVE_DELAY,
          ...delay,
        };

  const isHovers: Array<Ref<boolean>> = [];
  const value = ref(false);
  const enterTimer = ref<ReturnType<typeof setTimeout> | undefined>();
  const leaveTimer = ref<ReturnType<typeof setTimeout> | undefined>();
  const refs = Array.isArray(refElement) ? refElement : [refElement];
  refs.forEach((refEle) => {
    const eleRef = computed(() => {
      const ele = unref(refEle);
      return ele instanceof Element ? ele : (ele?.$el as Element);
    });
    const isHover = useElementHover(eleRef);
    isHovers.push(isHover);
  });
  const isOutsideAll = computed(() => isHovers.every((v) => !v.value));

  function clearTimers() {
    if (enterTimer.value) {
      clearTimeout(enterTimer.value);
      enterTimer.value = undefined;
    }
    if (leaveTimer.value) {
      clearTimeout(leaveTimer.value);
      leaveTimer.value = undefined;
    }
  }

  function setValueDelay(val: boolean) {
    clearTimers();

    if (val) {
      // 鼠标进入
      const enterDelay = normalizedOptions.enterDelay ?? DEFAULT_ENTER_DELAY;
      const delayTime = isFunction(enterDelay) ? enterDelay() : enterDelay;

      if (delayTime <= 0) {
        value.value = true;
      } else {
        enterTimer.value = setTimeout(() => {
          value.value = true;
          enterTimer.value = undefined;
        }, delayTime);
      }
    } else {
      // 鼠标离开
      const leaveDelay = normalizedOptions.leaveDelay ?? DEFAULT_LEAVE_DELAY;
      const delayTime = isFunction(leaveDelay) ? leaveDelay() : leaveDelay;

      if (delayTime <= 0) {
        value.value = false;
      } else {
        leaveTimer.value = setTimeout(() => {
          value.value = false;
          leaveTimer.value = undefined;
        }, delayTime);
      }
    }
  }

  const watcher = watch(
    isOutsideAll,
    (val) => {
      setValueDelay(!val);
    },
    { immediate: true },
  );

  const controller = {
    enable() {
      watcher.resume();
    },
    disable() {
      watcher.pause();
    },
  };

  onUnmounted(() => {
    clearTimers();
  });

  return [value, controller] as [typeof value, typeof controller];
}