const cloud = require('wx-server-sdk')

cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()

exports.main = async event => {
  const { OPENID } = cloud.getWXContext()
  const now = Date.now()
  const data = {
    openid: OPENID,
    draft: event.draft || {},
    updatedAt: now
  }
  const existed = await db.collection('drafts').where({ openid: OPENID }).limit(1).get()

  if (existed.data.length) {
    await db.collection('drafts').doc(existed.data[0]._id).update({ data })
    return { draftId: existed.data[0]._id, updatedAt: now }
  }

  const result = await db.collection('drafts').add({ data })
  return { draftId: result._id, updatedAt: now }
}