const cloud = require('wx-server-sdk')
cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV })
const db = cloud.database()
const _ = db.command
const RESULT_LIMIT = 20

function escapeRegExp(s) {
  return String(s).replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
}

exports.main = async (event, context) => {
  const keyword = String((event && event.keyword) || '').trim()
  if (!keyword) return { code: 0, data: [] }

  try {
    const re = db.RegExp({ regexp: escapeRegExp(keyword), options: 'i' })
    const res = await db.collection('users')
      .where(_.or([{ nickName: re }, { handle: re }, { location: re }]))
      .field({ nickName: true, avatarUrl: true, bio: true, handle: true, location: true })
      .limit(RESULT_LIMIT)
      .get()

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