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 { petId } = event || {}

  if (!petId) return { code: -1, message: '缺少宠物ID' }

  try {
    const userRes = await db.collection('users').where({ openid: OPENID }).get()
    if (userRes.data.length === 0) {
      return { code: -1, message: '用户不存在' }
    }
    const user = userRes.data[0]
    const pets = (Array.isArray(user.pets) ? user.pets : []).filter(p => p._id !== petId)

    await db.collection('users').doc(user._id).update({
      data: {
        pets,
        updatedAt: db.serverDate(),
      },
    })

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