MainViewController

//
//  ViewController.swift
//  loginSignup
//
//  Created by Yan Rips on 08/02/2019.
//  Copyright © 2019 Yan Rips. All rights reserved.
//

import UIKit

class ViewController: UIViewController {
    private let LOGIN_TYPE = 0
    private let LOGIN_TYPE_FAILED = 2
    private let SIGNUP_TYPE = 1
    private let STAGE_USERNAME = 0
    private let STAGE_PASSWORD = 1
    private var username:String = ""
    private var password:String = ""
    private var loginOrSignUP:Int = 0

    override func viewDidLoad() {
        super.viewDidLoad()




    }
    override func viewDidAppear(_ animated: Bool) {
        if validateUser(){
            signInScreen(animation: false)
        }
        initBtns()
    }
    func initBtns(){
        let loginBtn = UIButton(type: .system)
        loginBtn.frame = CGRect(x: view.frame.width/2-110, y: view.frame.height/2-80, width: 220, height: 80)
        loginBtn.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
        loginBtn.setTitle("Login", for: .normal)
        loginBtn.addTarget(self, action: #selector(loginInAlert), for: .touchUpInside)
        view.addSubview(loginBtn)


        let signUp = UIButton(type: .system) as UIButton
        signUp.frame = CGRect(x: view.frame.width/2-110, y: view.frame.height/2, width: 220, height: 80)
        signUp.titleLabel?.font = UIFont.boldSystemFont(ofSize: 30)
        signUp.setTitle("signUp", for: .normal)
        signUp.addTarget(self, action: #selector(signUpAlert), for: .touchUpInside)

        view.addSubview(signUp)
    }
    @objc func loginInAlert(warningMessage:Bool){
        var alert:UIAlertController
        if warningMessage {
            alert = initAlert(type: LOGIN_TYPE_FAILED, stage: STAGE_USERNAME)
        }else{
            alert = initAlert(type: LOGIN_TYPE, stage: STAGE_USERNAME)
        }
        present(alert, animated: true, completion: nil)
    }
    @objc func signUpAlert(){
        let alert = initAlert(type: SIGNUP_TYPE, stage: STAGE_USERNAME)
        present(alert, animated: true, completion: nil)
    }
    func initAlert(type:Int, stage:Int) -> UIAlertController{
        var title:String = ""
        var message:String = ""
        var placeHolder:String = ""
        var isSecure:Bool = false
        var confirmBtn:String = "continue"
        if(type == LOGIN_TYPE){
            title = "Login"
            loginOrSignUP = LOGIN_TYPE
        }
        if(type == SIGNUP_TYPE){
            title = "Sign Up"
            loginOrSignUP = SIGNUP_TYPE
        }
        if(stage == STAGE_USERNAME){
            message = "Please enter your username"
            placeHolder = "Username"
            if type == LOGIN_TYPE_FAILED{
                message = "Username or password is wrong \n Please enter your user name"
                title = "Failed to login, Try again"
            }
        }
        if(stage == STAGE_PASSWORD){
            message = "please enter your password"
            placeHolder = "Password"
            confirmBtn = title
            isSecure = true
        }
        let alert:UIAlertController = UIAlertController(title: title, message: message, preferredStyle: .alert)

        alert.addTextField { (editText: UITextField) in
            editText.placeholder = placeHolder
            editText.isSecureTextEntry = isSecure

            let confirmAct = UIAlertAction(title: confirmBtn, style: .default, handler: { (alertAct: UIAlertAction) in
                if let text = editText.text{
                    if(stage == self.STAGE_USERNAME){
                        self.username = text
                        if(type == self.LOGIN_TYPE || type == self.LOGIN_TYPE_FAILED){
                            self.loginAlertPassword()
                        }
                        if(type == self.SIGNUP_TYPE){
                            self.signUpAlertPassword()
                        }
                    }else if(stage == self.STAGE_PASSWORD){
                        self.password = text
                        self.loginOrSignupUser(username: self.username, password: self.password, loginOrSignup: self.loginOrSignUP)
                    }
                }
            })
            let cancelAct = UIAlertAction(title: "cancel", style: .cancel, handler: nil )
            alert.addAction(cancelAct)
            alert.addAction(confirmAct)
        }
        return alert
    }

    func loginAlertPassword(){
        let alert = initAlert(type: LOGIN_TYPE, stage: STAGE_PASSWORD)
        present(alert, animated: true, completion: nil)
    }
    func signUpAlertPassword(){
        let alert = initAlert(type: SIGNUP_TYPE, stage: STAGE_PASSWORD)
        present(alert, animated: true, completion: nil)
    }

    func loginOrSignupUser(username:String, password:String, loginOrSignup:Int){
        let url = URL(string: "http://192.168.1.18:8080/IOSLoginTest_war_exploded/servlet?login=\(loginOrSignup)&username=\(username)&password=\(password)")
        let task = URLSession.shared.dataTask(with: url!) { (data, response, error) in
            if let data = data {
                let message:String = String(data: data, encoding: String.Encoding.utf8)!
                if(message.contains("success")){
                    self.signInAndChangeScreen(username: username, password: password)
                }else{
                    if(self.loginOrSignUP == 0){
                        self.loginInAlert(warningMessage: true)
                    }else{
                        self.signUpAlert()
                    }
                }
            }
        }
        task.resume()
                    // Convert the data to JSON



    }
    func signInAndChangeScreen(username:String, password:String){
        if self.saveUserInCache(user: username, pass: password){
            self.signInScreen(animation: true)
        }
    }
    func saveUserInCache(user:String, pass:String) -> Bool{
        let preferences = UserDefaults.standard
        let usernameKey = "username"
        preferences.set(user, forKey: usernameKey)

        let passwordKey = "password"
        preferences.set(pass, forKey: passwordKey)
        let didSave = preferences.synchronize()
        if !didSave {
            print("could not save")
            return false
        }else{
            return true
        }

    }

    func signInScreen(animation:Bool){
        let signIn:SigninViewController = SigninViewController()
        present(signIn, animated: animation, completion: nil)
    }

    func validateUser() -> Bool{
        let preferences = UserDefaults.standard
        let usernameKey = "username"
        if preferences.object(forKey: usernameKey) == nil{
            return false //new User
        }else{
            return true //User Exsists
        }
    }


}