const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()

exports.main = async (event, context) => {
  const { OPENID } = cloud.getWXContext()
  const { postId } = event
  if (!postId) return { code: -1, message: '缺少 postId' }

  try {
    const post = await db.collection('posts').doc(postId).get()
    if (!post.data) return { code: -1, message: '帖子不存在' }

    const authorRes = await db.collection('users')
      .where({ openid: post.data.authorId })
      .field({ nickName: true, avatarUrl: true, openid: true, pets: true })
      .get()

    const likeRes = await db.collection('likes')
      .where({ userId: OPENID, postId })
      .count()

    return {
      code: 0,
      data: {
        ...post.data,
        author: authorRes.data[0] || null,
        isLiked: likeRes.total > 0,
      },
    }
  } catch (e) {
    return { code: -1, message: e.message }
  }
}