//
//  LoginView.swift
//  UserRegistrationExample
//
//  Created by Simo Korpikoski on 04/04/17.
//  Copyright © 2017 Simo Korpikoski. All rights reserved.
//

import Foundation
import UIKit
import FBSDKLoginKit
import Firebase
import FirebaseAuth

let defaults = UserDefaults.standard

var facebookdata : [String : AnyObject]!
var firstname = String()
var lastname = String()
var fbid = String()
var currentId = String()

class LoginViewController: UIViewController, UITextFieldDelegate {

    var dict : [String : AnyObject]!
    var tableData: NSArray = NSArray()
    var userEmailInput = String()

    @IBOutlet weak var usernameTextField: UITextField!
    @IBOutlet weak var userpasswordTextField: UITextField!
    @IBOutlet weak var loginButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        //initialize textfields for customization
        self.usernameTextField.delegate = self
        self.userpasswordTextField.delegate = self

        //initialize login button as unabled and check for changes in text fields
        loginButton.isEnabled = false
        usernameTextField.addTarget(self, action: #selector(editingChanged), for: .editingChanged)
        userpasswordTextField.addTarget(self, action: #selector(editingChanged), for: .editingChanged)


    }

    //Login Button functions
    @IBAction func loginButtonTapped(_ sender: AnyObject) {

        if self.usernameTextField.text == "" || self.userpasswordTextField.text == "" {

            //Alert to tell the user that there was an error because they didn't fill anything in the textfields because they didn't fill anything in

            let alertController = UIAlertController(title: "Error", message: "Lisää sähköposti ja salasana.", preferredStyle: .alert)

            let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
            alertController.addAction(defaultAction)

            self.present(alertController, animated: true, completion: nil)

        } else {

            FIRAuth.auth()?.signIn(withEmail: self.usernameTextField.text!, password: self.userpasswordTextField.text!) { (user, error) in

                if error == nil {

                    //Print into the console if successfully logged in
                    print("You have successfully logged in")

                    //Go to the HomeViewController if the login is sucessful
                    let vc = self.storyboard?.instantiateViewController(withIdentifier: "profile")
                    self.present(vc!, animated: true, completion: nil)

                } else {

                    //Tells the user that there is an error and then gets firebase to tell them the error
                    let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert)

                    let defaultAction = UIAlertAction(title: "OK", style: .cancel, handler: nil)
                    alertController.addAction(defaultAction)

                    self.present(alertController, animated: true, completion: nil)
                }
            }
        }

    }

    //Facebook button functions
    @IBAction func btnFBLoginPressed(_ sender: AnyObject) {
        let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
        fbLoginManager.logIn(withReadPermissions: ["email"], from: self) { (result, error) in
            if (error == nil){
                let fbloginresult : FBSDKLoginManagerLoginResult = result!
                if fbloginresult.grantedPermissions != nil {
                    if(fbloginresult.grantedPermissions.contains("email"))
                    {

                        self.getFBUserData()
                        fbLoginManager.logOut()
                    }


                    //segue to next page after a succesfull facebook login
                    DispatchQueue.main.asyncAfter(deadline: .now() + 0.4){
                        self.performSegue(withIdentifier: "login", sender: self)

                    }

              //      DispatchQueue.main.asyncAfter(deadline: .now() + 0.4) {
              //          self.performSegue(withIdentifier: "login", sender: self)
              //      }


                }
            }
        }
    }



    //Facebook subfunction for getting and printing data to console
    func getFBUserData(){
        if((FBSDKAccessToken.current()) != nil){
            FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).start(completionHandler: { (connection, result, error) -> Void in
                if (error == nil){
                    self.dict = result as! [String : AnyObject]

                    //loggedIn Boolean
                    defaults.set(true, forKey: "loggedIn")

                    //Json parsed into global variables
                    facebookdata = result as! [String : AnyObject]
                    firstname = facebookdata["first_name"]! as! String
                    lastname = facebookdata["last_name"]! as! String
                    fbid = facebookdata["id"]! as! String

                    print(result!)
                    print(self.dict["first_name"]!)
                    //  print(self.dict["id"]!)
                    print(facebookdata["id"]!)
                    //  print(self.dict["picture"]!)
                }
            })
        }
    }




    //Hide keyboard when user touches outside the keyboard
    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        self.view.endEditing(true)
    }

    //Return key press
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return (true)
    }


    //Unable login button if textfields are empty
    func editingChanged(_ textField: UITextField) {
        if textField.text?.characters.count == 1 {
            if textField.text?.characters.first == " " {
                textField.text = ""
                return
            }
        }
        guard
            let username = usernameTextField.text, !username.isEmpty,
            let password = userpasswordTextField.text, !password.isEmpty
            else {
                loginButton.isEnabled = false
                return
        }
        loginButton.isEnabled = true
    }



}