<template>
  <div class="tags-view-container">
    <scroll-panel ref="scrollPanel" class="tags-view-wrapper">
      <router-link
        v-for="tag in Array.from(visitedViews)"
        ref="tag"
        :class="isActive(tag)?'active':''"
        :to="tag"
        :key="tag.path"
        class="tags-view-item"
        @contextmenu.prevent.native="openMenu(tag,$event)"
      >
        {{ generateTitle(tag.title) }}
        <span
          class="el-icon-close"
          @click.prevent.stop="closeSelectedTag(tag)"
        />
      </router-link>
    </scroll-panel>

    <ul v-show="visible" :style="{left: left + 'px', top: top+'px'}" class="contextmenu">
      <li @click="refreshSelectedTag(selectedTag)">{{ $t('tagsView.refresh') }}</li>
      <li @click="closeSelectedTag(selectedTag)">{{ $t('tagsView.close') }}</li>
      <li @click="closeOthersTags">{{ $t('tagsView.closeOthers') }}</li>
      <li @click="closeAllTags">{{ $t('tagsView.closeAll') }}</li>
    </ul>
  </div>
</template>

<script>
  import ScrollPanel from '../scroll-panel'
  import { generateTitle } from '../../utils/i18n'

  export default {
    components: { ScrollPanel },
    data () {
      return {
        visible: false,
        top: 0,
        left: 0,
        selectedTag: {},
      }
    },
    computed: {
      visitedViews () {
        return this.$store.state.tagsView.visitedViews
      },
    },
    watch: {
      $route () {
        this.addViewTags()
        this.moveToCurrentTag()
      },
      visible (value) {
        if (value) {
          document.body.addEventListener('click', this.closeMenu)
        } else {
          document.body.removeEventListener('click', this.closeMenu)
        }
      },
    },
    mounted () {
      this.addViewTags()
    },
    methods: {
      generateTitle,
      generateRoute () {
        if (this.$route.name) {
          return this.$route
        }
        return false
      },
      isActive (route) {
        return route.path === this.$route.path
      },
      addViewTags () {
        const route = this.generateRoute()
        if (!route) {
          return false
        }
        this.$store.dispatch('tagsView/addView', route)
      },
      moveToCurrentTag () {
        const tags = this.$refs.tag
        this.$nextTick(() => {
          if (tags && tags.length > 0) {
            for (const tag of tags) {
              if (tag.to.path === this.$route.path) {
                this.$refs.scrollPanel.moveToTarget(tag.$el)
                break
              }
            }
          }
        })
      },
      refreshSelectedTag (view) {
        this.$store.dispatch('tagsView/delCachedView', view).then(() => {
          const { fullPath } = view

          this.$router.replace({
            path: '/redirect' + fullPath,
          })
        })
      },
      closeSelectedTag (view) {
        this.$store
          .dispatch('tagsView/delView', view)
          .then(({ visitedViews }) => {
            if (this.isActive(view)) {
              const latestView = visitedViews.slice(-1)[0]
              if (latestView) {
                this.$router.push(latestView)
              } else {
                this.$router.push('/')
              }
            }
          })
      },
      closeOthersTags () {
        this.$router.push(this.selectedTag)
        this.$store
          .dispatch('tagsView/delOthersViews', this.selectedTag)
          .then(() => {
            this.moveToCurrentTag()
          })
      },
      closeAllTags () {
        this.$store.dispatch('tagsView/delAllViews')
        this.$router.push('/')
      },
      openMenu (tag, e) {
        this.visible = true
        this.selectedTag = tag
        const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
        this.left = e.clientX - offsetLeft + 15 // 15: margin right
        this.top = e.clientY
      },
      closeMenu () {
        this.visible = false
      },
    },
  }
</script>

<style scoped>
  @import "../../assets/css/vars";

  .tags-view-container {
    height: $tags-view-height;
    width: 100%;
    background: #fff;
    border-bottom: 1px solid #d8dce5;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.12), 0 0 3px 0 rgba(0, 0, 0, 0.04);
    .tags-view-wrapper {
      .tags-view-item {
        display: inline-block;
        position: relative;
        height: 26px;
        line-height: 26px;
        border: 1px solid #d8dce5;
        color: #495060;
        background: #fff;
        padding: 0 8px;
        font-size: 12px;
        margin-left: 5px;
        margin-top: 4px;
        &:first-of-type {
          margin-left: 15px;
        }
        &:last-of-type {
          margin-right: 15px;
        }
        &.active {
          background-color: #42b983;
          color: #fff;
          border-color: #42b983;
          &::before {
            content: "";
            background: #fff;
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            position: relative;
            margin-right: 2px;
          }
        }
      }
    }
    .contextmenu {
      margin: 0;
      background: #fff;
      z-index: 100;
      position: absolute;
      list-style-type: none;
      padding: 5px 0;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 400;
      color: #333;
      box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, 0.3);
      li {
        margin: 0;
        padding: 7px 16px;
        cursor: pointer;
        &:hover {
          background: #eee;
        }
      }
    }
  }
</style>

<style >
  /* reset element css of el-icon-close */
  .tags-view-wrapper {
    .tags-view-item {
      .el-icon-close {
        width: 16px;
        height: 16px;
        vertical-align: 2px;
        border-radius: 50%;
        text-align: center;
        transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
        transform-origin: 100% 50%;
        &:before {
          transform: scale(0.6);
          display: inline-block;
          vertical-align: -3px;
        }
        &:hover {
          background-color: #b4bccc;
          color: #fff;
        }
      }
    }
  }
</style>
