const api = require('../../utils/api')

const formatDate = (value) => {
  if (!value) return ''
  const date = new Date(value)
  if (Number.isNaN(date.getTime())) return ''
  const month = String(date.getMonth() + 1).padStart(2, '0')
  const day = String(date.getDate()).padStart(2, '0')
  return `${date.getFullYear()}-${month}-${day}`
}

Page({
  data: {
    categories: [{ id: '', name: '推荐' }],
    activeCategoryId: '',
    articles: [],
    loading: true,
    loadError: false,
  },

  onLoad() {
    this.loadPage()
  },

  async loadPage() {
    this.setData({ loading: true, loadError: false })
    try {
      const [categories, articles] = await Promise.all([
        api.get('/content/categories'),
        api.get('/content/articles'),
      ])
      this.setData({
        categories: [{ id: '', name: '推荐' }, ...(categories || [])],
        articles: this.normalizeArticles(articles || [], categories || []),
        loading: false,
      })
    } catch (error) {
      console.error('加载婚恋课堂失败', error)
      this.setData({ loading: false, loadError: true })
    }
  },

  normalizeArticles(articles, categories) {
    const categoryNames = new Map(categories.map((item) => [item.id, item.name]))
    return articles.map((item) => ({
      ...item,
      categoryName: categoryNames.get(item.categoryId) || '婚恋课堂',
      publishAtText: formatDate(item.publishAt || item.createdAt),
    }))
  },

  async select(e) {
    const categoryId = e.currentTarget.dataset.id || ''
    if (categoryId === this.data.activeCategoryId) return
    this.setData({ activeCategoryId: categoryId, loading: true, loadError: false })
    try {
      const articles = await api.get('/content/articles', categoryId ? { categoryId } : undefined)
      this.setData({
        articles: this.normalizeArticles(articles || [], this.data.categories),
        loading: false,
      })
    } catch (error) {
      console.error('加载课堂分类失败', error)
      this.setData({ loading: false, loadError: true })
    }
  },

  open(e) {
    const id = e.currentTarget.dataset.id
    if (id) wx.navigateTo({ url: `/pages/content-detail/content-detail?id=${id}` })
  },

  onRetry() {
    this.loadPage()
  },
})