import { eq, desc, asc } from 'drizzle-orm'
import { useDB, schema } from '../../utils/db.js'

/**
 * 实体表数据构建器
 * 当 key 对应独立实体表时，从实体表动态读取数据，
 * 同时合并 site_content 中的元数据（summary/seo 等）
 */
function buildFromEntityTable(db, key, siteData) {
  switch (key) {
    case 'reviews': {
      const items = db.select().from(schema.reviews)
        .where(eq(schema.reviews.published, true))
        .orderBy(asc(schema.reviews.sortOrder), desc(schema.reviews.id))
        .all()
        .map(r => ({
          id: r.id,
          nickname: r.author,
          travelDate: r.date,
          productVersion: r.title,
          screenshot: '',
          content: r.content,
          rating: r.rating,
          scenes: [],
          concerns: [],
        }))
      // 合并 site_content 的 summary（如果有/��
      const summary = siteData?.summary || {
        totalCount: items.length,
        approvalRate: '98%',
      }
      // 用实体表 items 覆盖 site_content 的 items
      return { summary, items }
    }

    case 'faq': {
      const items = db.select().from(schema.faqs)
        .where(eq(schema.faqs.published, true))
        .orderBy(asc(schema.faqs.sortOrder), asc(schema.faqs.id))
        .all()
      // site_content 有分类结构则保留，把实体表的问答作为「全部」
      if (siteData?.categories) return siteData
      return {
        categories: [{
          id: 'all',
          name: '常见问题',
          questions: items.map(f => ({
            question: f.question,
            answer: f.answer,
          })),
        }],
      }
    }

    case 'gallery': {
      const items = db.select().from(schema.galleryItems)
        .where(eq(schema.galleryItems.published, true))
        .orderBy(asc(schema.galleryItems.sortOrder), asc(schema.galleryItems.id))
        .all()
      const works = items.map(g => ({
        id: g.id,
        title: g.title,
        category: g.category,
        location: g.location,
        description: g.description,
        image: g.image,
        orientation: g.orientation,
      }))
      const categories = siteData?.categories || [{key:"all",label:"全部作品"}]
      return {
        seo: siteData?.seo || {},
        intro: siteData?.intro || {},
        categories,
        works,
      }
    }

    case 'stories': {
      const items = db.select().from(schema.stories)
        .where(eq(schema.stories.published, true))
        .orderBy(asc(schema.stories.sortOrder), desc(schema.stories.id))
        .all()
        .map(s => ({
          ...s,
          sections: s.sections ? JSON.parse(s.sections) : [],
          keyMoments: s.keyMoments ? JSON.parse(s.keyMoments) : [],
        }))
      return { stories: items }
    }

    case 'news': {
      const items = db.select().from(schema.articles)
        .where(eq(schema.articles.published, true))
        .orderBy(desc(schema.articles.id))
        .all()
        .filter(a => a.type === 'news')
        .map(a => ({
          id: a.slug,
          title: a.title,
          summary: a.summary,
          content: a.content,
          category: a.category,
          coverImage: a.coverImage,
          author: a.author,
          tags: a.tags ? JSON.parse(a.tags) : [],
          date: a.createdAt,
        }))
      return { articles: items }
    }

    case 'blog': {
      const items = db.select().from(schema.articles)
        .where(eq(schema.articles.published, true))
        .orderBy(desc(schema.articles.id))
        .all()
        .filter(a => a.type === 'blog')
        .map(a => ({
          id: a.slug,
          title: a.title,
          summary: a.summary,
          content: a.content,
          category: a.category,
          coverImage: a.coverImage,
          author: a.author,
          tags: a.tags ? JSON.parse(a.tags) : [],
          seoTitle: a.seoTitle,
          seoDescription: a.seoDesc,
          seoKeywords: a.seoKeywords,
          date: a.createdAt,
        }))
      return { articles: items }
    }

    default:
      return null
  }
}

// 有entity表的 key 列表
const ENTITY_KEYS = ['reviews', 'faq', 'gallery', 'stories', 'news', 'blog']

export default defineEventHandler(async (event) => {
  const key = getRouterParam(event, 'key')
  const db = useDB()

  // 读site_content（作为元数据或兜底）
  const item = db.select().from(schema.siteContent)
    .where(eq(schema.siteContent.key, key))
    .get()
  const siteData = item ? JSON.parse(item.data) : null

  // 如果是实体表key，优先从实体表构建
  if (ENTITY_KEYS.includes(key)) {
    const result = buildFromEntityTable(db, key, siteData)
    if (result) {
      setHeader(event, 'Cache-Control', 'public, max-age=60')
      return result
    }
  }

  // 普通 site_content key
  if (!siteData) {
    throw createError({ statusCode: 404, message: `未找到配置项: ${key}` })
  }

  setHeader(event, 'Cache-Control', 'public, max-age=60')
  return siteData
})