public IActionResult Solve(long id, [FromBody] AttemptForm form)
{
var result = _instanceService.SolveQuiz(id, form);
if (result.Success)
{
return(Ok(new AttemptResponse(result.Value)));
}
return(BadRequest(result.Error));
}
public Result <Attempt> SolveQuiz(long instanceId, AttemptForm form)
{
var instance = _context.Instances
.Include(x => x.Attempts)
.Include(x => x.Questions)
.ThenInclude(x => x.Answers)
.FirstOrDefault(x => x.Id == instanceId);
if (instance == null)
{
return(Result.Fail <Attempt>("Couldn't find instance of id " + instanceId));
}
if (!instance.IsActive)
{
return(Result.Fail <Attempt>("Can't solve an expired instance."));
}
if (string.IsNullOrWhiteSpace(form.Identity))
{
return(Result.Fail <Attempt>("Invalid identity. Must not be null or whitespace only."));
}
if (instance.Attempts.FirstOrDefault(x => x.Identity.Equals(form.Identity)) != null)
{
return(Result.Fail <Attempt>("You can only solve a quiz once."));
}
var responses = new List <Response>();
var points = 0;
foreach (var pair in form.QuestionAnswerPairs)
{
var question = instance.Questions.FirstOrDefault(x => x.Id == pair.Q);
var answer = question?.Answers.FirstOrDefault(x => x.Id == pair.A);
if (answer == null)
{
continue;
}
if (!answer.IsCorrect)
{
continue;
}
points++;
responses.Add(new Response
{
Answer = answer
});
}
var attempt = new Attempt
{
Identity = form.Identity,
PointsScored = points,
Responses = responses
};
instance.Attempts.Add(attempt);
_context.Instances.Update(instance);
_context.SaveChanges();
return(Result.Ok(attempt));
}
