public ActionResult Deposit(TransactionModel transaction)
        {
            if (ModelState.IsValid)
            {
                db.Transactions.Add(transaction);
                db.SaveChanges();

                var service = new CheckingAccountService(db);
                service.UpdateBalance(transaction.CheckingAccountId);
                return RedirectToAction("Index", "Home");
            }
            return View();
        }
        public ActionResult QuickCash(int checkingAccountId, decimal amount)
        {
            var sourceCheckingAccount = db.CheckingAccounts.Find(checkingAccountId);
            var balance = sourceCheckingAccount.Balance;
            if (balance < amount)
            {
                return View("QuickCashInsufficientFunds");
            }
            db.Transactions.Add(new TransactionModel { CheckingAccountId = checkingAccountId, Amount = -amount });
            db.SaveChanges();

            var service = new CheckingAccountService(db);
            service.UpdateBalance(checkingAccountId);

            return RedirectToAction("Index", "Home");
        }
        public async Task<ActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl)
        {
            if (User.Identity.IsAuthenticated)
            {
                return RedirectToAction("Index", "Manage");
            }

            if (ModelState.IsValid)
            {
                // Get the information about the user from the external login provider
                var info = await AuthenticationManager.GetExternalLoginInfoAsync();
                if (info == null)
                {
                    return View("ExternalLoginFailure");
                }
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                var result = await UserManager.CreateAsync(user);
                if (result.Succeeded)
                {
                    result = await UserManager.AddLoginAsync(user.Id, info.Login);
                    if (result.Succeeded)
                    {
                        var service = new CheckingAccountService(HttpContext.GetOwinContext().Get<ApplicationDbContext>());
                        service.CreateCheckingAccount("Facebook", "User", user.Id, 500);

                        await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                        return RedirectToLocal(returnUrl);
                    }
                }
                AddErrors(result);
            }

            ViewBag.ReturnUrl = returnUrl;
            return View(model);
        }
        public async Task<ActionResult> Register(RegisterViewModel model)
        {
            if (ModelState.IsValid)
            {
                var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
                IdentityResult result = await UserManager.CreateAsync(user, model.Password);
                if (result.Succeeded)
                {
                    UserManager.AddClaim(user.Id, new Claim(ClaimTypes.GivenName, model.FirstName));
                    var service = new CheckingAccountService(HttpContext.GetOwinContext().Get<ApplicationDbContext>());
                    service.CreateCheckingAccount(model.FirstName, model.LastName, user.Id, 0);

                    await SignInManager.SignInAsync(user, isPersistent:false, rememberBrowser:false);
                    
                    // For more information on how to enable account confirmation and password reset please visit http://go.microsoft.com/fwlink/?LinkID=320771
                    // Send an email with this link
                    // string code = await UserManager.GenerateEmailConfirmationTokenAsync(user.Id);
                    // var callbackUrl = Url.Action("ConfirmEmail", "Account", new { userId = user.Id, code = code }, protocol: Request.Url.Scheme);
                    // await UserManager.SendEmailAsync(user.Id, "Confirm your account", "Please confirm your account by clicking <a href=\"" + callbackUrl + "\">here</a>");

                    return RedirectToAction("Index", "Home");
                }
                AddErrors(result);
            }

            // If we got this far, something failed, redisplay form
            return View(model);
        }
        public ActionResult Transfer(TransferViewModel transfer)
        {
            // check for available funds
            var sourceCheckingAccount = db.CheckingAccounts.Find(transfer.CheckingAccountId);
            if (sourceCheckingAccount.Balance < transfer.Amount)
            {
                ModelState.AddModelError("Amount", "You have insufficient funds!");
            }

            // check for a valid destination account
            var destinationCheckingAccount = db.CheckingAccounts.Where(c => c.AccountNumber == transfer.DestinationCheckingAccountNumber).FirstOrDefault();
            if (destinationCheckingAccount == null)
            {
                ModelState.AddModelError("DestinationCheckingAccountNumber", "Invalid destination account number.");
            }

            // add debit/credit transactions and update account balances
            if (ModelState.IsValid)
            {
                db.Transactions.Add(new TransactionModel { CheckingAccountId = transfer.CheckingAccountId, Amount = -transfer.Amount });
                db.Transactions.Add(new TransactionModel { CheckingAccountId = destinationCheckingAccount.Id, Amount = transfer.Amount });
                db.SaveChanges();

                var service = new CheckingAccountService(db);
                service.UpdateBalance(transfer.CheckingAccountId);
                service.UpdateBalance(destinationCheckingAccount.Id);

                return PartialView("_TransferSuccess", transfer);
            }
            return PartialView("_TransferForm");
        }
        public ActionResult Withdrawal(TransactionModel transaction)
        {
            var checkingAccount = db.CheckingAccounts.Find(transaction.CheckingAccountId);
            if (checkingAccount.Balance < transaction.Amount)
            {
                ModelState.AddModelError("Amount", "You have insufficient funds!");
            }

            if (ModelState.IsValid)
            {
                transaction.Amount = -transaction.Amount;
                db.Transactions.Add(transaction);
                db.SaveChanges();

                var service = new CheckingAccountService(db);
                service.UpdateBalance(transaction.CheckingAccountId);
                return RedirectToAction("Index", "Home");
            }
            return View();
        }