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

/**
 * 从 site_content JSON 数组中读取单个条目
 * GET /api/admin/site-content/item?key=products&path=versions&index=0
 */
export default defineEventHandler(async (event) => {
  requireAdmin(event)
  const query = getQuery(event)
  const { key, path, index } = query

  if (!key) throw createError({ statusCode: 422, message: 'key 参数必填' })

  const db = useDB()
  const row = db.select().from(schema.siteContent).where(eq(schema.siteContent.key, key)).get()
  if (!row) throw createError({ statusCode: 404, message: '未找到配置' })

  const data = JSON.parse(row.data)

  // 如果指定了 path，在嵌套对象中取数组
  let arr = data
  if (path) {
    arr = path.split('.').reduce((obj, k) => obj?.[k], data)
  }

  if (!Array.isArray(arr)) {
    throw createError({ statusCode: 422, message: `${path || 'root'} 不是数组` })
  }

  if (index !== undefined) {
    const idx = Number(index)
    if (idx < 0 || idx >= arr.length) throw createError({ statusCode: 404, message: '索引超出范围' })
    return { item: arr[idx], index: idx, total: arr.length }
  }

  // 不传 index 就返回列表概要（只取关键字段，不返回大块内容）
  const items = arr.map((item, i) => ({
    _index: i,
    id: item.id || '',
    name: item.name || item.title || '',
    tag: item.tag || item.line || '',
    days: item.days || '',
    nights: item.nights || '',
    subtitle: item.subtitle || '',
    audience: item.audience || '',
  }))

  return { items, total: arr.length }
})