const UserModel = require('../models/userModel')
const { SearchResult } = require('../models/Search')

exports.startTransaction = async () => {
  const seesion = await UserModel.startSession()
  seesion.startTransaction()
  return seesion
}

exports.commitTransaction = async (session) => {
  return await session.commitTransaction()
}

exports.rollbackTransaction = async (session) => {
  return await session.abortTransaction()
}

exports.selectAllUser = async () => {
  return await UserModel.find()
}

exports.selectUserList = async (search = {}) => {
  try {
    const { size = 20, page = 1, sort, filters } = search

    const skip = (page - 1) * size
    const searchResult = new SearchResult()
    searchResult.num = page
    searchResult.size = size

    // 检查 filters，确保只有在 filters 存在时才应用
    const matchFilters = filters ? { ...filters } : {}
    const sortObj = sort && typeof sort === 'object' ? sort : { _id: 1 } // 默认按 _id 升序排序

    const result = await UserModel.aggregate([
      // 应用过滤条件，确保filters存在时才传入
      { $match: matchFilters },
      {
        $facet: {
          metadata: [{ $count: 'total' }, { $addFields: { total: '$total' } }],
          data: [{ $sort: sortObj }, { $skip: skip }, { $limit: size }]
        }
      }
    ])

    // 解构 result 并进行必要的空值检查
    const { metadata = [], data = [] } = result[0] || {}

    // 提取 metadata 中的 total，若不存在则为 0
    searchResult.total = metadata.length > 0 ? metadata[0].total : 0
    searchResult.list = data

    return searchResult
  } catch (error) {
    console.log(error)
    throw error
  }
}

exports.selectUserById = async (id) => {
  return await UserModel.findById(id)
}

exports.selectUserByAccount = async (account) => {
  return await UserModel.findOne({ account: account })
}

exports.selectUserByEmail = async (email) => {
  return await UserModel.findOne({ email: email })
}

exports.selectUserByUsername = async (username) => {
  return await UserModel.findOne({ username: username })
}

exports.selectUserByPhone = async (phone) => {
  return await UserModel.findOne({ phone: phone })
}

exports.selectUserByAccountExist = async (account) => {
  const exist = await UserModel.exists({ account: account })
  return exist !== null
}

exports.createUser = async (user) => {
  return await UserModel.create(user)
}

exports.updateUserById = async (id, user) => {
  return await UserModel.findByIdAndUpdate(id, user)
}

exports.updateUserByLoginDate = async (id, loginDate) => {
  return await UserModel.findByIdAndUpdate(id, { last_login_date: loginDate })
}

exports.deleteUserById = async (id) => {
  return await UserModel.findByIdAndDelete(id)
}

exports.deleteAllUser = async () => {
  return await UserModel.deleteMany()
}