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 { toId, content, type = 'text' } = event || {}

  if (!toId || !String(content || '').trim()) {
    return { code: -1, message: '参数错误' }
  }

  try {
    const meRes = await db.collection('users').where({ openid: OPENID }).get()
    if (meRes.data.length === 0) return { code: -1, message: '用户不存在' }
    const myId = meRes.data[0]._id

    const message = {
      fromId: myId,
      toId,
      content: String(content).trim(),
      type,
      isRead: false,
      createdAt: db.serverDate(),
    }
    const res = await db.collection('messages').add({ data: message })

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