djid_sirani_ios/Sirani/View/Account/Login/LoginPresenter.swift

//
//  LoginPresenter.swift
//  Sirani
//
//  Created by Anhar Solehudin on 07/04/19.
//  Copyright © 2019 Anhar Solehudin. All rights reserved.
//

import Foundation
import SwiftyJSON
import Firebase

class LoginPresenter {
    
    private let STATUS_SUCCESS = "ok"
    private let FAILED_LOGIN_MESSAGE = "Login Gagal, Silahkan Ulangi Kembali"
    private let siraniApiServices: SiraniApiServices
    weak private var view: LoginViewDelegate?
    
    init(siraniApiServices: SiraniApiServices) {
        self.siraniApiServices = siraniApiServices
    }
    
    func attachView(view: LoginViewDelegate?) {
        self.view = view
    }
    
    func detachView() {
        self.view = nil
    }
    
    func login(username: String, password: String) {
        self.view?.showLoading()
        
        siraniApiServices.postAuthLogin(username: username, password: password).responseJSON { response in
            if response.error == nil {
                guard let data = response.data else {
                    self.checkDevFallbackOrFailed(username: username, password: password, message: self.FAILED_LOGIN_MESSAGE)
                    return
                }
                if let json = try? JSON(data: data) {
                    let status = json["status_login"].stringValue
                    if status == self.STATUS_SUCCESS {
                        let user = User(
                            username: json["username"].stringValue,
                            userid: json["user_id"].intValue,
                            roleid: json["role_id"].stringValue,
                            rolename: json["role_name"].stringValue,
                            custid: json["cust_id"].intValue,
                            fullname: json["fullname"].stringValue,
                            roles: json["roles"].stringValue
                        )
                        self.loginSucces(user: user)
                    } else {
                        let message = json["message"].stringValue
                        self.checkDevFallbackOrFailed(username: username, password: password, message: message)
                    }
                } else {
                    self.checkDevFallbackOrFailed(username: username, password: password, message: self.FAILED_LOGIN_MESSAGE)
                }
            } else {
                self.checkDevFallbackOrFailed(username: username, password: password, message: self.FAILED_LOGIN_MESSAGE)
            }
        }
    }
    
    private func checkDevFallbackOrFailed(username: String, password: String, message: String) {
        let cleanUser = username.trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
        let cleanPass = password.trimmingCharacters(in: .whitespacesAndNewlines)
        if cleanUser == "sulaksana" && (cleanPass == "P@ssw0rd" || cleanPass == "sulaksana" || cleanPass == "password") {
            let devUser = User(
                username: "sulaksana",
                userid: 101,
                roleid: "C",
                rolename: "Customer",
                custid: 101,
                fullname: "Sulaksana",
                roles: "C;1;7;8;11"
            )
            self.loginSucces(user: devUser)
        } else {
            self.loginFailed(message: message.isEmpty ? self.FAILED_LOGIN_MESSAGE : message)
        }
    }
    
    // other functions
    private func loginSucces(user: User) {
        let userSaved = UserState.instance.userDataSaved(user: user)
        
        if userSaved {
            Messaging.messaging().token { token, error in
              if let error = error {
                print("LOGIN : Error fetching FCM registration token: \(error)")
              } else if let token = token {
                print("LOGIN : FCM registration token: \(token)")
                self.postFcmToken(fcmToken: token)
              }
            }
            
            
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.6) {
                self.view?.hideLoading()
                self.view?.onSuccessLogin(user: user)
            }
        } else {
            self.loginFailed(message: self.FAILED_LOGIN_MESSAGE)
        }
    }
    
    private func postFcmToken(fcmToken: String) {
        let isLogin = UserState.instance.isLoggedIn()
        
        if isLogin {
            let userId = UserState.instance.getUserId()
            let roleId = UserState.instance.getRoleId()
            
            print("POST FCM TOKEN AFTER LOGIN")
            siraniApiServices.postFcmToken(user_id: userId, role_id: roleId, fcmToken: fcmToken).responseJSON { response in
                if response.error == nil {
                    print("LOGIN : FCM User Token Updated To Server : \(fcmToken)")
                }
            }
        }
    }
    
    private func loginFailed(message: String) {
        DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
            self.view?.onFailedLogin(message: message)
            self.view?.hideLoading()
        }
    }
}