vendoo_v1.0/Vendoo/SignUpViewController.swift

//
//  SecondViewController.swift
//  Vendoo
//
//  Created by Okechi Onyeje on 5/22/16.
//  Copyright © 2016 Okechi Onyeje. All rights reserved.
//

//@TODO: NEED TO PROMPT NEW USER THAT THEY HAVE BEEN LOGGED IN, NEED TO ADD AN INDICTOR TO LET USER KNOW THEY NEED TO WAIT AND NEED TO SEGUE TO MAIN SCREEN VIEW CONTROLLER

import UIKit
import FirebaseAuth
import Firebase
import Locksmith

class SignUpViewController: UIViewController {
    
    //IBOutlets
    @IBOutlet weak var email: UITextField!
    @IBOutlet weak var password: UITextField!
    @IBOutlet weak var name: UITextField!
    
    
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        
        //set delegates
        email.delegate = self
        password.delegate = self
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
}

//MARK: - IBAction
extension SignUpViewController {
    
    //sign up new user
    @IBAction func signUpUser(sender: AnyObject) {
        if( (self.email.text != "") && (self.name.text != "") && (self.password.text != "")) { //check for input in all 3 required fields
            
            let finalEmail = email!.text!.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
            
            if isValidEmail(finalEmail){
                FIRAuth.auth()?.createUserWithEmail(email.text!, password: password.text!) { (user, error) in
                    if error != nil {
                        
                        //alert for weak pass
                        if ( error!.userInfo["error_name"] as! String == "ERROR_WEAK_PASSWORD"){
                        
                            var alert = UIAlertController(title: "Password too Weak", message: "Please enter a stronger password to complete your sign up process.", preferredStyle: .Alert)
                         
                            alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
                            }))
                        self.presentViewController(alert, animated: true, completion: nil)
                         
                         //alert for in use email
                        }else if (error!.userInfo["error_name"] as! String == "ERROR_EMAIL_ALREADY_IN_USE"){
                         
                            var alert = UIAlertController(title: "Email Already in Use", message: "The email provided is already in use, please use a different email.", preferredStyle: .Alert)
                         
                            alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
                            }))
                        self.presentViewController(alert, animated: true, completion: nil)
                         
                        //unknown error or error case
                        }else{
                            var alert = UIAlertController(title: "Unknown Error", message: "An unknown error has occurred, please try again later.", preferredStyle: .Alert)
                            
                            alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
                            }))
                            self.presentViewController(alert, animated: true, completion: nil)

                        }
                        
                        print("user could not be created")
                        print(error!.localizedDescription)
                        
                        return
                    }
                    else{
                        //save user account
                        NSUserDefaults.standardUserDefaults().setBool(true, forKey: "signedIn")
                        NSUserDefaults.standardUserDefaults().setObject(self.email.text, forKey: "email")
                        NSUserDefaults.standardUserDefaults().setObject(self.name.text, forKey: "name")
                        
                        //save user credentials in Keychain
                        do{
                            try Locksmith.saveData(["pass": self.password.text!], forUserAccount: self.email.text!, inService: "vendoo")
                            print("account credentials saved")
                        }
                        catch{
                            //could not save data to keychain
                            print("account credentials could not be saved")
                            
                        }
                        self.performSegueWithIdentifier("HomeScreenSegue", sender:nil)
                    }
                }
                
            }else{
                //alert for invalid email
                let alert = UIAlertController(title: "Bad Email Given", message: "The email given was not valid. Please enter a valid email", preferredStyle: .Alert)
                
                alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
                }))
                self.presentViewController(alert, animated: true, completion: nil)

            }

            //alert for required fields missing
        }else {
        
            let alert = UIAlertController(title: "Missing Required Fields", message: "You are missing required field(s) to complete your Vendoo sign up. Please make sure the email, name, and password fields have been filled.", preferredStyle: .Alert)
            
            alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: {(action: UIAlertAction!) in
            }))
            self.presentViewController(alert, animated: true, completion: nil)

        }
        
    }
    
    
}

//MARK: - UITextfield Delegate Methods
extension SignUpViewController: UITextFieldDelegate {
    
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        self.view.endEditing(true)
        return false
    }
    
}

//MARK: - Class Helper Methods
extension SignUpViewController {
    
    //Validate Email/Username
    func isValidEmail(testStr:String) -> Bool {
        
        print("Validate emilId: \(testStr)")
        
        let emailRegEx = "[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,}"
        
        let emailTest = NSPredicate(format:"SELF MATCHES %@", emailRegEx)
        
        let result = emailTest.evaluateWithObject(testStr)
        
        return result
        
    }
}