public JObject resizeLoan(JObject request)
{
//Get arguments
request.TryGetValue("loanId", out JToken loanItemID);
request.TryGetValue("start", out JToken requestStart);
request.TryGetValue("end", out JToken requestEnd);
// Verify the arguments
List <string> failedVerifications = new List <string>();
if (loanItemID == null || loanItemID.Type != JTokenType.Integer)
{
failedVerifications.Add("loanId");
}
if (requestStart == null || !(requestStart.Type == JTokenType.String || requestStart.Type == JTokenType.Date))
{
failedVerifications.Add("start");
}
if (requestEnd == null || !(requestEnd.Type == JTokenType.String || requestEnd.Type == JTokenType.Date))
{
failedVerifications.Add("end");
}
if (failedVerifications.Any())
{
return(Templates.InvalidArguments(failedVerifications.ToArray()));
}
// Parse arguments
DateTime start;
DateTime end;
string loanID = loanItemID.ToString();
try { start = DateTime.Parse(requestStart.ToString()); } catch (Exception) { return(Templates.InvalidArgument("Unable to parse 'start'")); }
try { end = DateTime.Parse(requestEnd.ToString()); } catch (Exception) { return(Templates.InvalidArgument("Unable to parse 'end'")); }
if (end < start)
{
return(Templates.InvalidArguments("'end' must come after 'start'"));
}
DateTimeSpan newLoanSpan = new DateTimeSpan(start, end);
if (newLoanSpan.Start < DateTime.Now.Date)
{
return(Templates.InvalidArgument("'start' may not be set earlier than today."));
}
if (newLoanSpan.Duration > MaxLoanDuration)
{
return(Templates.InvalidArgument($"Duration of the loan may not exceed {MaxLoanDuration.Days} days."));
}
// Build a condition to get the specific loan
var condition = new MySqlConditionBuilder();
// Automatically limit results to current user only if their permission is User
if (CurrentUser.Permission <= UserPermission.User)
{
condition.And().Column("user").Equals(CurrentUser.Username, MySqlDbType.String);
}
condition.And().Column("id").Equals(loanID, MySqlDbType.Int32);
//Get the specified loanItem if it exists. If it doesn't, throw an error.
LoanItem oldLoan = Connection.Select <LoanItem>(condition).FirstOrDefault();
if (oldLoan == null)
{
return(Templates.NoSuchLoan(loanID));
}
// Return a loanExpired template if the loan has already ended
if (oldLoan.End < DateTime.Now)
{
return(Templates.LoanExpired());
}
if (oldLoan.Start < DateTime.Now && oldLoan.Start != start)
{
return(Templates.LoanAlreadyStarted());
}
// Build condition
condition = new MySqlConditionBuilder()
.Column("product_item")
.Equals(oldLoan.ProductItem, MySqlDbType.Int32);
// Select only relevant loans
condition.And().Column("end").GreaterThanOrEqual().Operand(start, MySqlDbType.DateTime);
condition.And().Column("start").LessThanOrEqual().Operand(end, MySqlDbType.DateTime);
//Get all loanItems for this loan's product_item.
var loans = Connection.Select <LoanItem>(condition).ToList();
//Check for conflicting loanItems
bool canResize = true;
foreach (var loan in loans)
{
var loanSpan = new DateTimeSpan(loan.Start, loan.End);
if (newLoanSpan.Overlaps(loanSpan))
{
canResize = false;
break;
}
}
//Create response
var responseData = new JObject();
JObject response = new JObject()
{
{ "reason", null },
{ "responseData", responseData }
};
if (canResize)
{
// Update loan
oldLoan.Start = start;
oldLoan.End = end;
Connection.Update(oldLoan);
}
else if (oldLoan.IsAcquired && !canResize) // If loan is not eligible for a item reassignment
{
return(Templates.LoanResizeFailed());
}
else // If the loan is eligible for an item reassignment
{
// Try to retrieve a list of unreserved equivalent products
var unreservedAlts = Core_GetUnreservedItems(oldLoan.GetProductItem(Connection).ProductId, newLoanSpan);
if (unreservedAlts == null) // Normally this value should not be able to be null. This block is just a failsafe that adds context.
{
throw new InvalidOperationException("Expected type of 'unreservedAlts' is List, but nullreference was found.");
}
if (!unreservedAlts.Any())
{
Log.Error("Failed at line 107");
return(Templates.LoanResizeFailed());
}
// Update loan
oldLoan.ProductItem = unreservedAlts.First().Id.Value;
oldLoan.Start = start;
oldLoan.End = end;
Connection.Update(oldLoan);
// Return new data in response and add message for context
responseData["product_item"] = oldLoan.ProductItem;
response["message"] = "Loan has been reassigned.";
}
return(response);
}