let converse = function ($http) {
  let apiUrl = 'http://localhost:8081'

  // Initialize Firebase
  let config = {
    apiKey: "AIzaSyCUq3YUcVzUkUpIyXmpGd_L43JX_xKyq64",
    authDomain: "tugasbesar3-2017.firebaseapp.com",
    databaseURL: "https://tugasbesar3-2017.firebaseio.com",
    projectId: "tugasbesar3-2017",
    storageBucket: "tugasbesar3-2017.appspot.com",
    messagingSenderId: "948017499394"
  }

  class Account {
    constructor (id) {
      this.id = id
      this.onchat = (msg) => {
        console.log(msg)
      }
    }

    async initAsync () {
      firebase.initializeApp(config)
      let messaging = firebase.messaging()

      messaging.onMessage(msg => {
        console.log(msg)
        this.onchat(msg.data.message)
      })

      try {
        await messaging.requestPermission()
      } catch (e) {
        console.log(e)
        alert('Please grant notification permission.')
      }

      try {
        let data = JSON.stringify({
          'token': await messaging.getToken()
        })

        console.log(data)
        await $http.post(`${apiUrl}/chat/${this.id}/token`, data)
      } catch (e) {
        console.log(e)
        alert('Unable to initialize chat service.')
      }
    }

    chatAsync (message) {
      let data = JSON.stringify({
        'message': message
      })

      return $http.post(`${apiUrl}/chat/${this.id}`, data)
    }
  }

  class Driver extends Account {
    async waitAsync (locations, timeout) {
      let response = await $http.post(`${apiUrl}/driver/${this.id}`, null, {
        timeout: timeout
      })

      return response.data.driver_id
    }
  }

  class User extends Account {
    async listAsync (location) {
      let response = await $http.get(`${apiUrl}/driver/find?location=${location}`)

      return response.data.driver_ids
    }

    pickAsync (id) {
      let data = JSON.stringify({
        'user_id': id
      })

      return $http.post(`${apiUrl}/driver/${this.id}/pick`, data)
    }
  }

  return {
    Driver: Driver,
    User: User
  }
}