async Task Stage1CertFee(IList <BillLineItem> container, TransactionCode code,
BillRequestLineItem item)
{
var duration = item.SubScheme == SubScheme.ShortTerm
? (item.ExpiresOn - item.StartsFrom).Days + 1
: BillingUtils.CalculateNoOfMonths(item.StartsFrom.Date, item.ExpiresOn.Date);
var factor = await _context.Stage1Factor();
// Full payment for stage 1
if (item.Scheme == Scheme.Endorsement ||
item.SubScheme == SubScheme.Canteen ||
item.SubScheme == SubScheme.ShortTerm)
{
factor = 1M;
}
// Short term billed per 7 days
else if (item.SubScheme == SubScheme.ShortTerm)
{
factor = Math.Ceiling(duration / 7M);
}
else
{
factor = Math.Min(factor, duration / 12M);
}
// For case where the pro-rated value is less than stage 1 expected factor.
factor = Math.Min(duration / 12, factor);
var unitPrice = code.GetLatestPriceAmount();
var gst = await _context.GST();
var qty = factor;
var fee = qty * unitPrice;
var gstAmount = fee * gst;
var section = BillingUtils.LineItemSection(BillType.Stage1);
var yearPrefix = duration > 12 ? " - Year 1" : "";
string prorateText = duration < 12 ? $" ({duration} of 12 months)" : "";
container.Add(new BillLineItem
{
SectionIndex = section.Item1,
Section = section.Item2,
Qty = qty,
CodeID = code.ID,
Code = code.Code,
Descr = $"{code.Text}{yearPrefix}{prorateText}",
UnitPrice = code.GetLatestPriceAmount(),
Amount = decimal.Round(fee, 2),
GSTAmount = decimal.Round(gstAmount, 2),
GST = gst,
WillRecord = true
});
}
/// <summary>
/// Calculates the amount base on given percentage. The ration determines a factor of the total
/// amount to be paid based on amount given. Ratio is mostly used for pro-rated fees.
/// </summary>
public static decimal CalculateAmount(TransactionCode code, decimal percentage,
decimal ratio = 1M)
{
var amount = code.GetLatestPriceAmount();
return(Math.Min(percentage * amount, ratio * amount));
}
async Task Stage2CertFee(BillRequestType requestType, IList <BillLineItem> container,
TransactionCode code, BillRequestLineItem item)
{
var totalDuration = BillingUtils.CalculateNoOfMonths(item.StartsFrom.Date, item.ExpiresOn.Date);
var stage1Factor = await _context.Stage1Factor();
var prorate = Math.Round(totalDuration / 12M, 2);
// No stage 2 payment for prorated application whose factor is less than stage 1 payment.
if (prorate < stage1Factor &&
requestType != BillRequestType.Renewal)
{
return;
}
var section = BillingUtils.LineItemSection(BillType.Stage2);
decimal factor;
int i = 0;
var duration = (decimal)totalDuration;
do
{
prorate = Math.Min(Math.Round(duration / 12M, 2), 1M);
// First year factor. Renewal will only have stage 2 payment.
if (i == 0 &&
requestType != BillRequestType.Renewal)
{
factor = Math.Max(Math.Min(
1M - stage1Factor,
prorate - stage1Factor), 0);
}
else
{
factor = Math.Min(1M, prorate);
}
if (factor == 0M)
{
break;
}
var unitPrice = code.GetLatestPriceAmount();
var gst = await _context.GST();
var qty = factor;
var fee = qty * unitPrice;
var gstAmount = fee * gst;
var yearPrefix = totalDuration > 12 ? $" - Year {i + 1}" : "";
var prorateText = duration < 12 ? $" ({(int)duration} of 12 months)" : "";
container.Add(new BillLineItem
{
SectionIndex = section.Item1,
Section = section.Item2,
Qty = qty,
CodeID = code.ID,
Code = code.Code,
Descr = $"{code.Text}{yearPrefix}{prorateText}",
UnitPrice = code.GetLatestPriceAmount(),
Amount = decimal.Round(fee, 2),
GSTAmount = decimal.Round(gstAmount, 2),
GST = gst,
WillRecord = true
});
duration -= 12;
i++;
} while (duration > 0);
}
