protected override Task <HandlerResult <List <Settlement> > > DoHandle(GetSettlementsQuery request)
{
var errors = ValidateRequest(request);
if (errors.Any())
{
return(Task.FromResult(Error(errors)));
}
var settlements = _dataContext.Settlements
.OrderByDescending(e => e.DateTime)
.Where(e => e.DateTime >= request.Start && e.DateTime <= request.End)
.Skip(request.Offset * request.PageSize)
.Take(request.PageSize)
.ToList();
return(Task.FromResult(Ok(settlements)));
}
private List <string> ValidateRequest(GetSettlementsQuery request)
{
var errorMessages = new List <string>();
if (request.PageSize < 0 || request.PageSize > 100)
{
errorMessages.Add("Page size must be between 0 and 100");
}
if (request.Offset < 0)
{
errorMessages.Add("Offset must be positive");
}
if (request.End < request.Start)
{
errorMessages.Add("End date must come after start date");
}
return(errorMessages);
}