public TransactionDto Pay(CreditCardDto from, BankAccountDto to, double amountDollar)
{
if (!IsValid(from))
{
return(null);
}
var builder = new TransactionBuilder();
Transaction transaction = builder
.From(from.CardNumber)
.To(to.Id)
.AmountDollar(amountDollar)
.TimeUtcNow()
.Build();
using (var db = new BankSystemContext())
{
Transaction saved = db.Transactions.Add(transaction);
BankAccountDetails fromBank = db.BankAccounts.FirstOrDefault(bank => bank.CreditCards.Any(card => card.CardNumber == from.CardNumber));
if (fromBank == null)
{
return(null);
}
fromBank.Balance -= transaction.AmountDollar;
BankAccountDetails toBank = db.BankAccounts.Find(to.Id);
toBank.Balance += transaction.AmountDollar;
db.SaveChanges();
return(mapper.Map <TransactionDto>(transaction));
}
}
public List <TransactionDto> GetAllTransactions()
{
using (var db = new BankSystemContext())
{
var query = from transaction in db.Transactions
select transaction;
return(mapper.Map <List <TransactionDto> >(query.ToList()));
}
}
public List <BankAccountDto> GetAllBankAccounts()
{
using (var db = new BankSystemContext())
{
var query = from bank in db.BankAccounts
select bank;
return(mapper.Map <List <BankAccountDto> >(query.ToList()));
}
}
public List <TransactionDto> TransactionHistoryOf(BankAccountDto bank)
{
using (var db = new BankSystemContext())
{
var query = from transaction in db.Transactions
where transaction.From.BankAccount.Id.Equals(bank.Id) || transaction.To.Id.Equals(bank.Id)
select transaction;
return(mapper.Map <List <TransactionDto> >(query.ToList()));
}
}
public BankAccountDto GetBankAccount(int id)
{
using (var db = new BankSystemContext())
{
var query = from bank in db.BankAccounts
where bank.Id == id
select bank;
return(mapper.Map <BankAccountDto>(query.FirstOrDefault()));
}
}
public List <CreditCardDto> GetCardsForAccount(int accountId)
{
using (var db = new BankSystemContext())
{
var query = from card in db.CreditCards
where card.BankAccountId.Equals(accountId)
select card;
return(mapper.Map <List <CreditCardDto> >(query.ToList()));
}
}
public BankAccountDto CreateEmptyBankAccount(string name)
{
BankAccountDetails details = new BankAccountDetails
{
HolderName = name,
};
using (var db = new BankSystemContext())
{
db.BankAccounts.Add(details);
db.SaveChanges();
}
return(mapper.Map <BankAccountDto>(details));
}
public BankAccountDto DepositMoney(int bankId, double amountDollar)
{
if (amountDollar > 10000 || amountDollar <= 0)
{
return(null);
}
using (var db = new BankSystemContext())
{
BankAccountDetails bank = db.BankAccounts.Find(bankId);
if (bank == null)
{
return(null);
}
bank.Balance += amountDollar;
db.SaveChanges();
return(mapper.Map <BankAccountDto>(bank));
}
}
private CreditCardDetails GenerateRandomCard(string prefix, int length, BankAccountDetails bank)
{
string ccnumber = prefix;
while (ccnumber.Length < (length - 1))
{
double rnd = (random.NextDouble() * 1.0f - 0f);
ccnumber += Math.Floor(rnd * 10);
}
// reverse number and convert to int
var reversedCCnumberstring = ccnumber.ToCharArray().Reverse();
var reversedCCnumberList = reversedCCnumberstring.Select(c => Convert.ToInt32(c.ToString()));
// calculate sum //Luhn Algorithm
int sum = 0;
int pos = 0;
int[] reversedCCnumber = reversedCCnumberList.ToArray();
while (pos < length - 1)
{
int odd = reversedCCnumber[pos] * 2;
if (odd > 9)
{
odd -= 9;
}
sum += odd;
if (pos != (length - 2))
{
sum += reversedCCnumber[pos + 1];
}
pos += 2;
}
// calculate check digit
int checkdigit =
Convert.ToInt32((Math.Floor((decimal)sum / 10) + 1) * 10 - sum) % 10;
ccnumber += checkdigit;
var date = DateTime.Now.AddYears(6).AddMonths(6);
using (var db = new BankSystemContext())
{
var card = new CreditCardDetails
{
BankAccountId = bank.Id,
CardNumber = ccnumber,
CardVerificationValue = (random.Next(1000) + "").PadLeft(3),
Month = date.Month,
Year = date.Year
};
db.CreditCards.Add(card);
db.SaveChanges();
return(card);
}
}
/// <summary>
/// checks if credit card details are valid
/// </summary>
/// <returns>true if this card is valid</returns>
public bool IsValid()
{
var len = CardNumber.Length;
if (len == 0)
{
return(false);
}
// check for all numbers
if (!CardNumber.All(char.IsDigit))
{
return(false);
}
if (!CardVerificationValue.All(char.IsDigit))
{
return(false);
}
if (CardVerificationValue.Length != 3)
{
return(false);
}
// Check card not expired
if (Month > 12)
{
return(false);
}
var time = DateTime.Now;
if (time.Year > Year)
{
return(false);
}
if (time.Year == Year && time.Month > Month)
{
return(false);
}
using (var db = new BankSystemContext())
{
var query = from card in db.CreditCards
where card.Month == this.Month &&
card.Year == this.Year &&
card.CardNumber == this.CardNumber &&
card.CardVerificationValue == this.CardVerificationValue
select card.BankAccount;
BankAccountDetails found = query.FirstOrDefault();
this.BankAccount = found;
return(found != null);
}
}
