const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()
const _ = db.command
const ONE_DAY_MS = 24 * 3600 * 1000

// 项目暂未建立独立的"故事"集合，这里把指定用户最近(24小时内)发布的
// 带图片动态包装成"故事"展示，作为 Stories 功能的轻量实现
exports.main = async (event, context) => {
  const id = (event && event.id) || ''
  if (!id) return { code: -1, message: '缺少用户ID' }

  try {
    const since = new Date(Date.now() - ONE_DAY_MS)
    let postsRes = await db.collection('posts')
      .where({ authorId: id, createdAt: _.gte(since) })
      .orderBy('createdAt', 'desc')
      .limit(20)
      .get()

    let posts = postsRes.data.filter(p => Array.isArray(p.images) && p.images.length > 0)

    if (posts.length === 0) {
      // 兜底：取该用户最近一条带图动态
      const fallbackRes = await db.collection('posts')
        .where({ authorId: id })
        .orderBy('createdAt', 'desc')
        .limit(20)
        .get()
      posts = fallbackRes.data.filter(p => Array.isArray(p.images) && p.images.length > 0).slice(0, 1)
    }

    if (posts.length === 0) return { code: 0, data: [] }

    const userRes = await db.collection('users').where({ openid: id }).field({ nickName: true }).get()
    const authorName = (userRes.data[0] && userRes.data[0].nickName) || '宠物爱好者'

    const stories = posts.map(p => ({
      _id: p._id,
      authorId: p.authorId,
      authorName,
      imageUrl: p.images[0],
      text: p.content || '',
      createdAt: p.createdAt,
    }))

    return { code: 0, data: stories }
  } catch (e) {
    return { code: -1, message: e.message }
  }
}