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 { userId } = event

  try {
    let userRes
    if (userId) {
      // Look up by DB _id
      userRes = await db.collection('users').doc(userId).get().catch(() => null)
      if (!userRes?.data) {
        // Fallback: look up by openid
        const res = await db.collection('users').where({ openid: userId }).get()
        userRes = res.data.length > 0 ? { data: res.data[0] } : null
      }
    } else {
      const res = await db.collection('users').where({ openid: OPENID }).get()
      userRes = res.data.length > 0 ? { data: res.data[0] } : null
    }

    if (!userRes?.data) return { code: -1, message: '用户不存在' }

    const user = userRes.data

    // Check follow status
    const followRes = await db.collection('follows')
      .where({ followerId: OPENID, followeeId: user.openid })
      .count()

    return {
      code: 0,
      data: { ...user, isFollowing: followRes.total > 0 },
    }
  } catch (e) {
    return { code: -1, message: e.message }
  }
}