using System;

using UIKit;

namespace iOSApp
{
    public partial class signUpViewController : UIViewController
    {
        partial void SignUpButton_TouchUpInside(UIButton sender)
        {
            throw new NotImplementedException();
         }

        public signUpViewController(IntPtr handle) : base(handle)
        {
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            // Perform any additional setup after loading the view, typically from a nib.
        }

        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
            // Release any cached data, images, etc that aren't in use.
        }
    }
}

using DBCore;
using DBCore.Tables;
using System;
using System.Collections.Generic;
using System.Data.Entity.Infrastructure;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DBBusinessLogic
{
     public class userOperations
    {
        public userOperations()
        {

        }

        public int createNewUser(string usr, string pass, string emailAddress, string fName, string lName)
        {
            try
            {
                using (studyGroupContext db = new studyGroupContext())
                {
                    var c = db.users.Where(b => b.email == emailAddress).ToList(); //checking if the emailAddress exists
                    if (c.Count > 0)
                        return 1;
                    c = db.users.Where(b => b.userName == usr).ToList();
//checking if the emailAddress exists
                    if (c.Count > 0)
                        return 2;
                    users entry = new users { userName = usr, password = pass, email = emailAddress, firstName = fName, lastName = lName };
                    db.users.Add(entry);
                    int i=db.SaveChanges();
                    if(i==1)
                        return 0;

                }
            }
            catch (DbUpdateException)
            {
                throw;
            }
            return 3;
        }

        public int logIn(string usr, string pass)
        {
            try {
                using (var db = new studyGroupContext())
                {
                    var c = db.users.Where(b => b.userName == usr).ToList();//get the list that contains this user
                    if (c.Count == 0)
                        return 1;//no user exception
                    if (c[0].password == pass)
                        return 0;//return 0 is for success
                    else
                        return 2;//wrong password exception
                }
            }
            catch(Exception)
            {
                return 3;//unknown exception
            }

        }
    }
}