public ActionResult <string> GetBalance()
{
string readText = System.IO.File.ReadAllText("Balances.txt");
string[] balances = readText.Split('\n');
List <PayerAccount> allAccounts = new List <PayerAccount>();
for (int i = 0; i < balances.Length - 1; i++)
{
string[] currentBalance = balances[i].Substring(1, balances[i].Length - 2).Split(", ");
PayerAccount payerAccount = new PayerAccount {
payer = currentBalance[0], points = Int32.Parse(currentBalance[1])
};
allAccounts.Add(payerAccount);
}
if (System.IO.File.Exists("Transactions.txt"))
{
System.IO.File.Delete("Transactions.txt");
}
return(JsonConvert.SerializeObject(allAccounts));
}
public ActionResult <string> Spend([FromBody] object points)
{
int p = (int)JObject.Parse(points.ToString())["points"];
string readText = System.IO.File.ReadAllText("Transactions.txt");
string[] transactions = readText.Split('\n');
Dictionary <string, int> totalPoints = new Dictionary <string, int>();
for (int i = 0; i < transactions.Length - 1; i++)
{
var a = JObject.Parse(transactions[i]);
if (!totalPoints.ContainsKey((string)a["payer"]))
{
totalPoints.Add((string)a["payer"], (int)a["points"]);
}
else
{
totalPoints[(string)a["payer"]] = totalPoints[(string)a["payer"]] + (int)a["points"];
}
}
Dictionary <DateTime, int> toSort1 = new Dictionary <DateTime, int>();
for (int i = 0; i < transactions.Length - 1; i++)
{
var a = JObject.Parse(transactions[i]);
toSort1.Add(DateTime.Parse((string)a["timestamp"]), i);
}
// toSort is the final sorted dictionary which guides the transactions in the order of their timestamp
var toSort = toSort1.OrderBy(p => p.Key);
Dictionary <string, int> payerAccounts = new Dictionary <string, int>();
foreach (var x in toSort)
{
var a = JObject.Parse(transactions[x.Value]);
if (p >= (int)a["points"])
{
/*If the payer isn't already on records, if the points value is positive,
* it should go in, else it is a bad request*/
if (!payerAccounts.ContainsKey((string)a["payer"]))
{
int sub = (int)a["points"];
if (sub < 0)
{
if (System.IO.File.Exists("Transactions.txt"))
{
System.IO.File.Delete("Transactions.txt");
}
return(BadRequest());
}
payerAccounts.Add((string)a["payer"], -1 * sub);
p = p - sub;
}
/* If the payer already exists in the dictionary, value should be updated
* if the result value is still positive, else it will be a bad request*/
else
{
int sub = (int)a["points"];
int already = payerAccounts[(string)a["payer"]];
if ((-1 * already) + sub < 0)
{
if (System.IO.File.Exists("Transactions.txt"))
{
System.IO.File.Delete("Transactions.txt");
}
return(BadRequest());
}
p = p - sub;
payerAccounts[(string)a["payer"]] = already - sub;
}
}
else
{
payerAccounts.Add((string)a["payer"], -1 * p);
break;
}
}
Dictionary <string, int> balances = new Dictionary <string, int>();
using StreamWriter streamWriter = new StreamWriter("Balances.txt", append: true);
// Calculating final balances upfront and storing them in the text file.
foreach (var x in totalPoints)
{
balances.Add(x.Key, totalPoints[x.Key] + payerAccounts[x.Key]);
}
foreach (var x in balances)
{
streamWriter.WriteLineAsync(x.ToString());
}
List <PayerAccount> catalog = new List <PayerAccount>();
foreach (var x in payerAccounts)
{
PayerAccount payer = new PayerAccount {
payer = x.Key, points = x.Value
};
catalog.Add(payer);
}
return(JsonConvert.SerializeObject(catalog));
}