<template>
  <div class="__common-layout-pageTabs">
    <el-scrollbar>
      <div class="__tabs">
        <div
          class="__tab-item"
          v-for="item in openedPageRouters"
          :class="{
            '__is-active': item.fullPath == $route.fullPath,
          }"
          :key="item.fullPath"
          @click="onClick(item)"
          @contextmenu.prevent="showContextMenu($event, item)"
        >
          {{ item.meta.title }}
          <span
            class="el-icon-close"
            @click.stop="onClose(item)"
            @contextmenu.prevent.stop=""
            :style="openedPageRouters.length <= 1 ? 'width:0;' : ''"
          ></span>
        </div>
      </div>
    </el-scrollbar>
    <div v-show="contextMenuVisible">
      <ul
        :style="{ left: contextMenuLeft + 'px', top: contextMenuTop + 'px' }"
        class="__contextmenu"
      >
        <li>
          <el-button type="text" @click="reload()" size="mini">
            重新加载
          </el-button>
        </li>
        <li>
          <el-button
            type="text"
            @click="closeOtherLeft"
            :disabled="false"
            size="mini"
            >关闭左边</el-button
          >
        </li>
        <li>
          <el-button
            type="text"
            @click="closeOtherRight"
            :disabled="false"
            size="mini"
            >关闭右边</el-button
          >
        </li>
        <li>
          <el-button type="text" @click="closeOther" size="mini"
            >关闭其他</el-button
          >
        </li>
      </ul>
    </div>
  </div>
</template>
<script>
export default {
  props: {
    keepAliveComponentInstance: {}, //keep-alive控件实例对象
    blankRouteName: {
      type: String,
      default: "blank",
    } //空白路由的name值
  },
  data() {
    return {
      contextMenuVisible: false, //右键菜单是否显示
      contextMenuLeft: 0, //右键菜单显示位置
      contextMenuTop: 0, //右键菜单显示位置
      contextMenuTargetPageRoute: null, //右键所指向的菜单路由
      openedPageRouters: [], //已打开的路由页面
      parentList: []
    };
  },
  watch: {
    //当路由变更时，执行打开页面的方法
    $route: {
      handler(v) {
      	if(this.openedPageRouters) {
      		this.openedPageRouters.forEach((item, index) => {
	      		if(item.name === v.query.deletePage) {
	      			this.openedPageRouters.splice(index, 1)
	      		}
	      	})
      	}
        this.$emit('updateFn')
        this.$emit('includeListFn', v.name)
        this.openPage(v);
      },
      immediate: true
    }
  },
  mounted() {
    //添加点击关闭右键菜单
    window.addEventListener("click", this.closeContextMenu);
  },
  destroyed() {
    window.removeEventListener("click", this.closeContextMenu);
  },
  methods: {
    //打开页面
    openPage(route) {
      if (route.name == this.blankRouteName) {
        return;
      }
      let isExist = this.openedPageRouters.some(
        (item) => item.fullPath == route.fullPath
      );
      if (!isExist) {
        let openedPageRoute = this.openedPageRouters.find(
          (item) => item.path == route.path
        );
        //判断页面是否支持不同参数多开页面功能，如果不支持且已存在path值一样的页面路由，那就替换它
        if (!route.meta.canMultipleOpen && openedPageRoute != null) {
          this.delRouteCache(openedPageRoute);
          this.openedPageRouters.splice(
            this.openedPageRouters.indexOf(openedPageRoute),
            1,
            route
          );
        } else {
        	if(route.meta.title) {
        		if(this.openedPageRouters.length < 1) {
        			this.openedPageRouters.push(route);
        			if(route.meta.flag) {
        				this.parentList.push(route.meta.flag)
        			}
        		} else {
        			if (!route.meta.flag && !this.parentList.includes(route.fullPath)) {
	              this.openedPageRouters.push(route);
	            } else {
	              this.openedPageRouters.forEach((item, index) => {
	                if(item.fullPath === route.meta.flag) {
	                  this.parentList.push(item.fullPath)
	                  this.openedPageRouters.splice(index, 1, route)
	                } else if(item.meta.flag === route.fullPath) {
	                  this.parentList.splice(index, 1)
	                  this.openedPageRouters.splice(index, 1, route)
	                }
	              })
	            }
        		}
        	}
        }
      }
    },
    //点击页面标签卡时
    onClick(route) {
      if (route.fullPath !== this.$route.fullPath) {
        this.$router.push(route.fullPath);
      }
    },
    //关闭页面标签时
    onClose(route) {
      let index = this.openedPageRouters.indexOf(route);
      this.delPageRoute(route);
      if (route.fullPath === this.$route.fullPath) {
        //删除页面后，跳转到上一页面
        this.$router.replace(
          this.openedPageRouters[index == 0 ? 0 : index - 1]
        );
      }
    },
    //右键显示菜单
    showContextMenu(e, route) {
      this.contextMenuTargetPageRoute = route;
      this.contextMenuLeft = e.layerX;
      this.contextMenuTop = e.layerY;
      this.contextMenuVisible = true;
    },
    //隐藏右键菜单
    closeContextMenu() {
      this.contextMenuVisible = false;
      this.contextMenuTargetPageRoute = null;
    },
    //重载页面
    reload() {
      this.parentList = []
      this.delRouteCache(this.contextMenuTargetPageRoute);
      if (this.contextMenuTargetPageRoute.fullPath === this.$route.fullPath) {
        this.$router.replace({ name: this.blankRouteName }).then(() => {
          this.$router.replace(this.contextMenuTargetPageRoute);
        });
      }
    },
    //关闭其他页面
    closeOther() {
      for (let i = 0; i < this.openedPageRouters.length; i++) {
        let r = this.openedPageRouters[i];
        if (r !== this.contextMenuTargetPageRoute) {
          this.delPageRoute(r);
          i--;
        }
      }
      if (this.contextMenuTargetPageRoute.fullPath != this.$route.fullPath) {
        this.$router.replace(this.contextMenuTargetPageRoute);
      }
    },
    //根据路径获取索引
    getPageRouteIndex(fullPath) {
      for (let i = 0; i < this.openedPageRouters.length; i++) {
        if (this.openedPageRouters[i].fullPath === fullPath) {
          return i;
        }
      }
    },
    //关闭左边页面
    closeOtherLeft() {
      let index = this.openedPageRouters.indexOf(
        this.contextMenuTargetPageRoute
      );
      let currentIndex = this.getPageRouteIndex(this.$route.fullPath);
      if (index > currentIndex) {
        this.$router.replace(this.contextMenuTargetPageRoute);
      }
      for (let i = 0; i < index; i++) {
        let r = this.openedPageRouters[i];
        this.delPageRoute(r);
        i--;
        index--;
      }
    },
    //关闭右边页面
    closeOtherRight() {
      let index = this.openedPageRouters.indexOf(
        this.contextMenuTargetPageRoute
      );
      let currentIndex = this.getPageRouteIndex(this.$route.fullPath);
      for (let i = index + 1; i < this.openedPageRouters.length; i++) {
        let r = this.openedPageRouters[i];
        this.delPageRoute(r);
        i--;
      }
      if (index < currentIndex) {
        this.$router.replace(this.contextMenuTargetPageRoute);
      }
    },
    //删除页面
    delPageRoute(route) {
      this.parentList.forEach((item, index) => {
        if(item === route.meta.flag) {
          this.parentList.splice(index, 1)
        }
      })
      let routeIndex = this.openedPageRouters.indexOf(route);
      if (routeIndex >= 0) {
        this.openedPageRouters.splice(routeIndex, 1);
      }
      this.delRouteCache(route);
    },
    //删除页面缓存
    delRouteCache(key) {
      this.$emit('excludeListFn', key.name)
    }
  },
};
</script>
<style lang="less">
.__common-layout-pageTabs {
  background: #FFFFFF;
  height: 32px;
  border-bottom: 1px solid #F5F5F5;
  .__contextmenu {
    // width: 100px;
    margin: 0;
    border: 1px solid #e4e7ed;
    background: #fff;
    z-index: 3000;
    position: absolute;
    list-style-type: none;
    padding: 5px 0;
    border-radius: 4px;
    font-size: 14px;
    color: #333;
    box-shadow: 1px 1px 3px 0 rgba(0, 0, 0, 0.1);
    li {
      margin: 0;
      padding: 0px 15px;
      &:hover {
        background: #f2f2f2;
        cursor: pointer;
      }
      button {
        color: #2c3e50;
      }
    }
  }

  position: relative;
  &::before {
    content: "";
    border-bottom: 1px solid #fff;
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    height: 100%;
  }
  .__tabs {
    display: flex;
    .__tab-item {
      white-space: nowrap;
      padding: 0px 8px;
      height: 32px;
      font-size: 12px;
      border-left: none;
      border-bottom: 0px;
      line-height: 32px;
      cursor: pointer;
      transition: color 0.3s cubic-bezier(0.645, 0.045, 0.355, 1),
        padding 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
      &:first-child {
        border-top-left-radius: 2px;
      }
      &:last-child {
        border-top-right-radius: 2px;
        margin-right: 10px;
      }
      &:not(.__is-active):hover {
        color: #409eff;
        .el-icon-close {
          width: 12px;
          margin-right: 0px;
        }
      }
      &.__is-active {
        color: #333;
        background: #F1F7FF;
        box-shadow: 0px 1px 3px rgba(0, 21, 41, 0.12);
        .el-icon-close {
          width: 12px;
          margin-right: 0px;
          margin-left: 2px;
        }
      }
      .el-icon-close {
        width: 0px;
        overflow: hidden;
        font-size: 12px;
        transform-origin: 100% 50%;
        transition: all 0.3s cubic-bezier(0.645, 0.045, 0.355, 1);
        vertical-align: text-top;
        line-height: 18px;
        &:hover {
          color: #fff;
        }
      }
    }
  }
}
</style>