import Vue from 'vue'
import { on } from './dom.js'

const nodeList = []
const ctx = '@@clickoutsideContext'

!Vue.prototype.$isServer && on(document, 'click', e => {
  nodeList.forEach(node => node[ctx].documentHandler(e))
})
/**
 * v-clickoutside
 * @desc 点击元素外面才会触发的事件
 * @example
 * ```vue
 * <div v-element-clickoutside="handleClose">
 * ```
 */
export default {
  bind (el, binding, vnode) {
    const id = nodeList.push(el) - 1
    const documentHandler = function (e) {
      if (!vnode.context ||
        el.contains(e.target) ||
        (vnode.context.popperElm &&
        vnode.context.popperElm.contains(e.target))) return

      if (binding.expression &&
        el[ctx].methodName &&
        vnode.context[el[ctx].methodName]) {
        vnode.context[el[ctx].methodName]()
      } else {
        el[ctx].bindingFn && el[ctx].bindingFn()
      }
    }
    el[ctx] = {
      id,
      documentHandler,
      methodName: binding.expression,
      bindingFn: binding.value
    }
  },

  update (el, binding) {
    el[ctx].methodName = binding.expression
    el[ctx].bindingFn = binding.value
  },

  unbind (el) {
    const len = nodeList.length

    for (let i = 0; i < len; i++) {
      if (nodeList[i][ctx].id === el[ctx].id) {
        nodeList.splice(i, 1)
        break
      }
    }
  }
}