//helper to reduce duplicate code and make sure month is in MM format.
private void Append_Grouped_Transaction(ref List <Grouped_Transaction> list, int month, int year, double total_credit, double total_debit)
{
Grouped_Transaction gt = new Grouped_Transaction();
//ensure month is always MM
string str_month = month.ToString();
str_month = str_month.PadLeft(2, '0');
gt.year_month = year.ToString() + "-" + str_month.ToString();
gt.monthly_credit = total_credit;
gt.monthly_debit = Math.Abs(total_debit);
list.Add(gt);
}
//this method formats the output Json string based on the transactions grouped by month/year.
public void Get_Grouped_Transactions_Json(List <Grouped_Transaction> grouped_transactions, out string grouped_json)
{
StringBuilder sb = new StringBuilder();
//Bail out early. If list is empty return empty string.
if (grouped_transactions.Count == 0)
{
grouped_json = "";
return;
}
//build the output JSON based upon the requirements.
//the format for each line similar to --> "2014-10": {"spent": "$200.00", "income": "$500.00"},
//the JSON serializer/deserializer library that I am using does not have functionality to
//customize the fields to the level that is required so I wrote this.
sb.Append("{");
foreach (Grouped_Transaction gt in grouped_transactions)
{
//format for each line.
//"2014-10": {"spent": "$200.00", "income": "$500.00"},
double monthly_credit = Math.Round(gt.monthly_credit, 2);
double monthly_debit = Math.Round(gt.monthly_debit, 2);
sb.Append("\"" + gt.year_month + "\":" + "{\"spent\":\"$" + monthly_debit.ToString() + "\",\"income\":" + "\"$" + monthly_credit.ToString() + "\"}");
//if it's the very last transaction, append the average month.
if (grouped_transactions.IndexOf(gt) == grouped_transactions.Count - 1)
{
sb.Append(",\n");
//append the averge month.
Grouped_Transaction average_month = GetAverageMonth(grouped_transactions);
double avg_monthly_credit = Math.Round(average_month.monthly_credit, 2);
double avg_monthly_debit = Math.Round(average_month.monthly_debit, 2);
sb.Append("\"" + average_month.year_month + "\":" + "{\"spent\":\"$" + avg_monthly_debit.ToString() + "\",\"income\":" + "\"$" + avg_monthly_credit.ToString() + "\"}");
sb.Append("}");
}
else
{
sb.Append(",\n");
}
}
grouped_json = sb.ToString();
}