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

exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()
  const openid = wxContext.OPENID
  const { action } = event

  if (action === 'sync') {
    const d = event.data
    await db.collection('treatment_records').add({
      data: {
        openid,
        session_id: d.session_id || 'S' + Date.now(),
        device_id: d.device_id || '',
        regions: d.regions || 0,
        total_duration_ms: d.total_duration_ms || 0,
        mode: d.mode || 0,
        avg_pd: d.avg_pd || 0,
        created_at: db.serverDate()
      }
    })
    return { code: 0, data: { session_id: d.session_id || 'S' + Date.now() } }
  }

  if (action === 'history') {
    const { page = 1, page_size = 20 } = event.data || {}
    const totalRes = await db.collection('treatment_records').where({ openid }).count()
    const records = await db.collection('treatment_records')
      .where({ openid })
      .orderBy('created_at', 'desc')
      .skip((page - 1) * page_size)
      .limit(page_size)
      .get()

    return { code: 0, data: { records: records.data, total: totalRes.total } }
  }

  return { code: -1, message: '未知操作' }
}