<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in breadcrumbs" :key="item.path">
                <span v-if="item.redirect === 'noredirect' || index === breadcrumbs.length - 1" class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts">
import { compile } from "path-to-regexp";
import { Component, Vue, Watch } from "vue-property-decorator";
import { RouteRecord, Route } from "vue-router";

@Component({
    name: "Breadcrumb",
})
export default class extends Vue {
    private breadcrumbs: RouteRecord[] = [];

    @Watch("$route")
    private onRouteChange(route: Route) {
        // if you go to the redirect page, do not update the breadcrumbs
        if (route.path.startsWith("/redirect/")) {
            return;
        }
        this.getBreadcrumb();
    }

    created() {
        this.getBreadcrumb();
    }

    private getBreadcrumb() {
        let matched = this.$route.matched.filter((item) => item.meta && item.meta.title);
        const first = matched[0];

        this.breadcrumbs = matched.filter((item) => {
            return item.meta && item.meta.title && item.meta.breadcrumb !== false;
        });
    }

    private isDashboard(route: RouteRecord) {
        const name = route && route.meta && route.meta.title;
        return name === "Dashboard";
    }

    private pathCompile(path: string) {
        // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
        const { params } = this.$route;
        const toPath = compile(path);
        return toPath(params);
    }

    private handleLink(item: any) {
        const { redirect, path } = item;
        if (redirect) {
            this.$router.push(redirect);
            return;
        }
        this.$router.push(this.pathCompile(path));
    }
}
</script>

<style lang="scss" scoped>
.el-breadcrumb__inner,
.el-breadcrumb__inner a {
    font-weight: 400 !important;
}

.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    height: 30px;
    line-height: 40px;
    margin-left: 8px;

    .no-redirect {
        color: #97a8be;
        cursor: text;
    }
}
</style>
