LoginViewController.swift

//
//  LoginViewController.swift
//  ITSoftin
//
//  Created by demetrius albuquerque on 08/12/14.
//  Copyright (c) 2014 Snowman Labs. All rights reserved.
//

import UIKit
import Foundation
import QuartzCore

/**
*  `LoginViewController` controller of Login screen
*/
class LoginViewController: UIViewController, UITextFieldDelegate {
    
    @IBOutlet weak var userTxt: UITextField!
    @IBOutlet weak var passTxt: UITextField!
    @IBOutlet weak var blueView: UIView!
    @IBOutlet weak var enterBtn: UIButton!
    @IBOutlet weak var enterConstrain: NSLayoutConstraint!
    
    /**
    someconfiguration about view.
    */
    override func viewDidLoad() {
        super.viewDidLoad()
        //Added tapGestureRecognizer to dismiss keyboard
        let tap = UITapGestureRecognizer(target: self, action: "dismissKeyboard")
        self.view.addGestureRecognizer(tap);
        
        
        blueView.layer.cornerRadius = 3;
        userTxt.layer.cornerRadius = 3;
        passTxt.layer.cornerRadius = 3;
        userTxt.delegate = self
        passTxt.delegate = self
        
        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWasShown:"), name:UIKeyboardWillShowNotification, object: nil);

        NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name:UIKeyboardWillHideNotification, object: nil);

    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    /**
    Add a gesture reconize when you press out of a UITextField
    
    :param: gestureRecognizer gestureRecognizer Gesture Recognizers to Simplify Event Handling

    :param: otherGestureRecognizer otherGestureRecognizer  that must fail before the receiving recognizer can begin
    
    :returns: return true
    */
    func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        return true
    }
    
    /**
    Check if field have a valid value and give a different color if the result is true or false
    
    :param: sender sender UITextField
    
    :returns: return true or false after check if contains a valid value from sender
    */
    func checkFields(sender: UITextField) -> Bool{

        sender.layer.borderWidth = 1.0;
        
        if sender.text.isEmpty {
            sender.layer.borderColor = UIColor.redColor().CGColor;
            return true;
        }
        
        sender.layer.borderColor = UIColor.whiteColor().CGColor;


        
        return false;
    }
    /**
    Try login after clicked, if login is ok, go to MainView. Anotherway give a error message.
    
    :param: sender sender UIButton
    */
    @IBAction func pressedButton(sender: NSObject) {
        
        if (checkFields(passTxt) && checkFields(userTxt)){
            return;
        }
        
        if (checkFields(passTxt)){
            return;
        }
        
        if(checkFields(userTxt)){
            return;
        }
        
        UserFetcher.doLogin(userTxt.text, passwd: passTxt.text) { (result : NSDictionary) in
            if result["status"] as String == "fail" || result.count <= 0{
                UIAlertView(title: "Erro", message: result["message"] as? String, delegate: nil, cancelButtonTitle: "OK").show()
                
            }else{
                User.saveUser(self.userTxt.text, token: result["token"] as String)
                self.dismissViewControllerAnimated(false, completion: nil);
                ClientCollection.sharedInstance
            }
            
        }
        
    }
    
    /**
    change cursor to next textField
    
    :param: textField textField focus textField
    
    :returns: return false when became the next textField focused and true when enter button is pressed
    */
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        if textField.isEqual(userTxt){
            passTxt.becomeFirstResponder();
            
            return false;
            
        }
        self.pressedButton(self);
        
        return true;
        
    }
    
    /**
    selector to dismiss keyboard after some place of screen is touched
    */
    func dismissKeyboard(){
        userTxt.resignFirstResponder();
        passTxt.resignFirstResponder();
    }
    
    /**
    keyboardWasShow change value of contrain to move components on the screen
    
    :param: notification notification UIKeyboardWillShowNotification
    */
    func keyboardWasShown(notification: NSNotification) {
        var info = notification.userInfo!
        var keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
        
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.enterConstrain.constant = keyboardFrame.size.height + 20
        })
    }
    
    
    /**
    keyboardWillHide move down the contrain to get original position
    
    :param: notification notification UIKeyboardWillHideNotification
    */
    func keyboardWillHide(notification: NSNotification) {
        var info = notification.userInfo!
        var keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as NSValue).CGRectValue()
        
        UIView.animateWithDuration(0.1, animations: { () -> Void in
            self.enterConstrain.constant = self.enterConstrain.constant - keyboardFrame.size.height + 20
        })
    }
    
}