<template>
  <NuxtLayout
    name="category"
    :categories="categoryTree"
    :subCategories="subCategoryTree"
    :selected-category="{
      uid: articlePageCategoryUid,
      title: category.title
    }"
    :breadcrumbs="breadcrumbs"
  >
    <ArticleList :articles="articles" />
    <Pagination v-model="pagination" />
  </NuxtLayout>
</template>

<script>
import { definePageMeta } from '#imports'
import { ref } from 'vue'
import { useRoute } from 'vue-router'
import Pagination from '@/components/common/Pagination'
import CategoryUtil from '@/utils/category'
import ArticleList from '@/components/cms/ArticleList'
import { fetchTemplateData } from '@/api/cms/template'
import { fetchArticlePage } from '@/api/cms/article'
import { strictPackage } from '@/utils/util'

export default {
  components: {
    ArticleList,
    Pagination
  },
  async setup () {
    // 去掉默认布局
    definePageMeta({
      layout: false,
    })
    const route = useRoute()
    const data = strictPackage(await fetchTemplateData({
      path: '/category/[categoryUid]/index.vue',
      targetUid: route.params.categoryUid,
      targetType: 'CATEGORY',
      parameters: {
        categoryUid: route.params.categoryUid
      }
    }))
    // 获取分页所使用的栏目UID
    const articlePageCategoryUid = data.ARTICLE_PAGE_PARAMETERS.categoryUid
    const categoryUtil = new CategoryUtil(data.CATEGORIES_TREE)
    const category = categoryUtil.getCategory(articlePageCategoryUid)
    if (category == null) {
      throw new Error(`找不到栏目，UID: ${articlePageCategoryUid}`)
    }
    return {
      categoryUid: route.params.categoryUid,
      categoryTree: data.CATEGORIES_TREE,
      subCategoryTree: data.SUB_CATEGORIES_TREE,
      category: categoryUtil.getCategory(articlePageCategoryUid),
      // 查询文章分页数据的栏目ID
      articlePageCategoryUid,
      // 面包屑
      breadcrumbs: categoryUtil.getBreadcrumb(articlePageCategoryUid),
      // 文章列表数据
      articles: ref(data.ARTICLE_PAGE.records),
      // 分页数据
      pagination: ref({
        page: data.ARTICLE_PAGE.page,
        capacity: data.ARTICLE_PAGE.capacity,
        total: data.ARTICLE_PAGE.total
      })
    }
  },
  watch: {
    // 路由参数变化时，触发数据搜索
    '$route.query': function (newQuery) {
      this.handlePageChange(Number(newQuery.page) || 1)
    }
  },
  methods: {
    /**
     * 页码变更
     *
     * @param page 新页码
     */
    handlePageChange (page) {
      this.pagination.page = page
      fetchArticlePage({
        page: this.pagination.page,
        capacity: this.pagination.capacity,
        model: {
          categoryUid: this.articlePageCategoryUid
        }
      })
        .then(data => {
          this.pagination.page = page
          this.pagination.total = data.total
          this.articles = data.records
        })
        .catch(e => console.error(e))
    }
  }
}
</script>
