import { mapState } from 'vuex'
import VisitedModelTransform from '@/utils/mixins/tran-visited'

class VisitedPathItem {
  constructor (path, search) {
    this.path = path
    this.search = search
    this.timestamp = Date.now()
  }
}

const TranModel = new VisitedModelTransform()

export const mixinVisited = {
  computed: {
    ...mapState({
      visitedList: state => state.user.visitedList
    })
  },
  created () {
    this.$store.commit('user/refreshVisited')
  },
  methods: {
    createPathItem (path, search) {
      return TranModel.transformItem(new VisitedPathItem(path, search))
    },
    // 从判断 path 是否访问过
    // 参数path为 VisitedPathItem new 出来的实例
    pathVisitedIndex (path) {
      const list = this.visitedList
      let sameIndex = -1
      if (list) {
        for (let i = 0; i < list.length; i++) {
          const same = this.comparePath(list[i], path)
          if (same) {
            sameIndex = i
            break
          }
        }
      }
      return sameIndex
    },
    comparePath (basePath, newPath) {
      const pathSame = basePath.type === newPath.type
      const searchSame = basePath.id === newPath.id

      return pathSame && searchSame
    },
    pathVisited (path) {
      return this.pathVisitedIndex(path) !== -1
    },
    // 保存一条历史
    // 参数path为 VisitedPathItem new出来的实例
    pathVisiting (path) {
      if (!path) return
      // 判断是否重复
      const index = this.pathVisitedIndex(path)
      const visitedList = JSON.parse(JSON.stringify(this.visitedList))
      if (index >= 0) {
        // 已存在
        const itemArr = visitedList.splice(index, 1)
        const item = itemArr[0]
        item.timestamp = Date.now()
        visitedList.unshift(item)
      } else {
        visitedList.unshift(path)
      }
      // 全量替换
      this.$store.commit('user/addVisited', visitedList)
    }
  }
}