/*
  Utility functions used to prepare the environment for tests.
*/

// Public NPM libraries
const mongoose = require('mongoose')
const axios = require('axios').default

// Local libraries
const config = require('../../config')
const User = require('../../src/models/users')

const LOCALHOST = `http://localhost:${config.port}`

// Remove all collections from the DB.
async function cleanDb () {
  for (const collection in mongoose.connection.collections) {
    const collections = mongoose.connection.collections
    if (collections.collection) {
      // const thisCollection = mongoose.connection.collections[collection]
      // console.log(`thisCollection: ${JSON.stringify(thisCollection, null, 2)}`)

      await collection.deleteMany()
    }
  }
}

// Delete all users in the database. This ensures there is no previous state
// to confuse tests.
async function deleteAllUsers () {
  try {
    // Get all the users in the DB.
    const users = await User.find({}, '-password')
    // console.log(`users: ${JSON.stringify(users, null, 2)}`)

    // Delete each user.
    for (let i = 0; i < users.length; i++) {
      const thisUser = users[i]
      await thisUser.remove()
    }
  } catch (err) {
    console.error('Error in test-utils.js/deleteAllUsers()')
  }
}

// This function is used to create new users.
// userObj = {
//   username,
//   password
// }
async function createUser (userObj) {
  try {
    const options = {
      method: 'POST',
      url: `${LOCALHOST}/users`,
      data: {
        user: {
          email: userObj.email,
          password: userObj.password,
          name: userObj.name
        }
      }
    }

    const result = await axios(options)

    const retObj = {
      user: result.data.user,
      token: result.data.token
    }

    return retObj
  } catch (err) {
    console.log(
      'Error in utils.js/createUser(): ' + JSON.stringify(err, null, 2)
    )
    throw err
  }
}

async function loginTestUser () {
  try {
    const options = {
      method: 'POST',
      url: `${LOCALHOST}/auth`,
      data: {
        email: 'test@test.com',
        password: 'pass'
      }
    }

    const result = await axios(options)

    // console.log(`result: ${JSON.stringify(result.data, null, 2)}`)

    const retObj = {
      token: result.data.token,
      user: result.data.user.username,
      id: result.data.user._id.toString()
    }

    return retObj
  } catch (err) {
    console.log(
      'Error authenticating test user: ' + JSON.stringify(err, null, 2)
    )
    throw err
  }
}

async function loginAdminUser () {
  try {
    const FILENAME = `../../config/system-user-${config.env}.json`
    const adminUserData = require(FILENAME)
    console.log(`adminUserData: ${JSON.stringify(adminUserData, null, 2)}`)

    const options = {
      method: 'POST',
      url: `${LOCALHOST}/auth`,
      data: {
        email: adminUserData.email,
        password: adminUserData.password,
        name: 'admin'
      }
    }

    const result = await axios(options)

    // console.log(`result: ${JSON.stringify(result.data, null, 2)}`)

    const retObj = {
      token: result.data.token,
      user: result.data.user.username,
      id: result.data.user._id.toString()
    }

    return retObj
  } catch (err) {
    console.log(
      'Error authenticating test admin user: ' + JSON.stringify(err, null, 2)
    )
    throw err
  }
}

// Retrieve the admin user JWT token from the JSON file it's saved at.
async function getAdminJWT () {
  try {
    // process.env.KOA_ENV = process.env.KOA_ENV || 'dev'
    // console.log(`env: ${process.env.KOA_ENV}`)

    const FILENAME = `../../config/system-user-${config.env}.json`
    const adminUserData = require(FILENAME)
    // console.log(`adminUserData: ${JSON.stringify(adminUserData, null, 2)}`)

    return adminUserData.token
  } catch (err) {
    console.error('Error in test/utils.js/getAdminJWT()')
    throw err
  }
}

module.exports = {
  cleanDb,
  createUser,
  loginTestUser,
  loginAdminUser,
  getAdminJWT,
  deleteAllUsers
}