.swift

//
//  CMLoginViewController.swift
//  Coffee Mapper
//
//  Created by Charles Kang on 4/13/16.
//  Copyright © 2016 Charles Kang. All rights reserved.
//

import UIKit

class CMLoginViewController: UIViewController
{
    @IBOutlet weak var signUpButtonTapped: UIButton!
    @IBOutlet weak var signInButtonTapped: UIButton!
    
    @IBOutlet weak var passwordTextField: UITextField!
    @IBOutlet weak var emailTextField: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        self.hideKeyboardWhenTappedAround()
    }
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
        
        if NSUserDefaults.standardUserDefaults().valueForKey("uid") != nil && DataService.dataService.CURRENT_USER_REF.authData != nil {
            self.performSegueWithIdentifier("CurrentlyLoggedIn", sender: nil)
        }
    }
    
    @IBAction func signInButtonTapped(sender: AnyObject)
    {
        let email = emailTextField.text
        let password = passwordTextField.text
        
        if email != "" && password != "" {
            DataService.dataService.BASE_REF.authUser(email, password: password, withCompletionBlock: { error, authData in
                if error != nil {
                    print(error)
                    self.loginErrorAlert("Oops!", message: "Check your username and password.")
                } else {
                    NSUserDefaults.standardUserDefaults().setValue(authData.uid, forKey: "uid")
                    
                    self.performSegueWithIdentifier("CurrentlyLoggedIn", sender: nil)
                }
            })
        } else {
            loginErrorAlert("Oops!", message: "Don't forget to enter your email and password.")
        }
    }
    func loginErrorAlert(title: String, message: String) {
        let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
        let action = UIAlertAction(title: "Ok", style: .Default, handler: nil)
        alert.addAction(action)
        presentViewController(alert, animated: true, completion: nil)
    }
}

extension UIViewController {
    func hideKeyboardWhenTappedAround() {
        let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(UIViewController.dismissKeyboard))
        view.addGestureRecognizer(tap)
    }
    
    func dismissKeyboard() {
        view.endEditing(true)
    }
}