public AnswerSheetResult MakeAnswerSheet(string sessionToken, Models.AnswerSheet answerSheet)
{
var result = new AnswerSheetResult();
var userID = _checkSessionToken(sessionToken, result);
if (userID.HasValue && mContext.Exam.FirstOrDefault(e => e.Id == answerSheet.ExamId) != null)
{
answerSheet.Id = 0;
answerSheet.UserId = userID.Value;
answerSheet.Score = 0;
answerSheet.IsClosed = false;
answerSheet.CreatedAt = DateTime.Now;
mContext.AnswerSheet.Add(answerSheet);
mContext.SaveChanges();
result.AnswerSheet = answerSheet;
}
else
{
result.MessageError = string.Format("Không tìm thấy đề thi!");
}
return(result);
}
public BasicResult Answer(string sessionToken, Models.AnswerSheet answerSheet, long quizzesId, string answer)
{
var result = new BasicResult();
var userId = _checkSessionToken(sessionToken, result);
var ans = mContext.AnswerSheet.FirstOrDefault(a => a.Id == answerSheet.Id && a.UserId == userId);
if (ans != null)
{
var exam = mContext.Exam.FirstOrDefault(e => e.Id == ans.ExamId);
var deadline = ans.CreatedAt.AddMinutes(exam.Time);
if (deadline <= DateTime.Now)
{
ans.IsClosed = true;
}
var quizzesIds = exam.Quizzes.Split(new char[] { ',' });
if (ans.IsClosed == true)
{
result.MessageError = string.Format("Bài kiểm tra đã được đóng, không thể tiếp tục");
var answers = mContext.AnswerSheetItem
.Where(ai => ai.AnswerSheetId == ans.Id).ToArray();
ans.Score = answers.Select(i => i.Match ? 1.0 : 0.0).Sum() / answers.Length;
mContext.SaveChanges();
}
else if (quizzesIds.Any(q => q == quizzesId.ToString()))
{
var answerItem = mContext.AnswerSheetItem
.FirstOrDefault(ai => ai.AnswerSheetId == ans.Id && ai.QuizzesId == quizzesId);
if (answerItem == null)
{
answerItem = new Models.AnswerSheetItem()
{
AnswerSheetId = ans.Id,
QuizzesId = quizzesId,
Answer = answer,
Match = false
};
mContext.AnswerSheetItem.Add(answerItem);
}
var quizzes = mContext.Quizzes.FirstOrDefault(q => q.Id == quizzesId);
answerItem.Match = quizzes != null?quizzes.Answer.Trim() == answer.Trim() : false;
mContext.SaveChanges();
}
else
{
result.MessageError = string.Format("Câu hỏi không có trong đề thi!");
}
}
return(result);
}
public QuizzesResult NextQuizzes(string sessionToken, Models.AnswerSheet answerSheet)
{
var result = new QuizzesResult();
var userID = _checkSessionToken(sessionToken, result);
var exam = mContext.Exam.FirstOrDefault(e => e.Id == answerSheet.ExamId);
if (userID.HasValue && exam != null)
{
var quizzesIds = exam.Quizzes.Split(new char[] { ',' })
.Select(id => int.Parse(id)).ToArray();
var index = 0;
var nextQuizzes = 0;
for (int i = 0; i < quizzesIds.Length; ++i)
{
if (answerSheet.CurrentQuizzes.HasValue == false ||
answerSheet.CurrentQuizzes == 0 ||
answerSheet.CurrentQuizzes == quizzesIds[i])
{
nextQuizzes = quizzesIds[++i < quizzesIds.Length ? i : 0];
index = i;
break;
}
}
answerSheet.CurrentQuizzes = nextQuizzes;
mContext.SaveChanges();
var quizzes = mContext.Quizzes.FirstOrDefault(q => q.Id == nextQuizzes);
if (quizzes != null)
{
result.AnswerSheet = answerSheet;
result.Index = index;
result.Question = quizzes.Question;
result.ChooseA = quizzes.ChooseA;
result.ChooseB = quizzes.ChooseB;
result.ChooseC = quizzes.ChooseC;
result.ChooseD = quizzes.ChooseD;
result.Answer = mContext.AnswerSheetItem
.Where(ai => ai.AnswerSheetId == answerSheet.Id && ai.QuizzesId == nextQuizzes)
.Select(ai => ai.Answer)
.FirstOrDefault();
}
else
{
result.MessageError = string.Format("Không tìm thấy câu hỏi. :(");
}
}
return(result);
}
public DoneAnswerSheetResult DoneAnswerSheet(string sessionToken, Models.AnswerSheet answerSheet)
{
var result = new DoneAnswerSheetResult();
var userId = _checkSessionToken(sessionToken, result);
var ans = mContext.AnswerSheet.FirstOrDefault(a => a.Id == answerSheet.Id && a.UserId == userId);
if (ans != null)
{
var answers = mContext.AnswerSheetItem
.Where(ai => ai.AnswerSheetId == ans.Id).ToArray();
ans.IsClosed = true;
ans.Score = Math.Round((answers.Select(i => i.Match ? 1.0 : 0.0).Sum() / answers.Length) * 10, 1);
mContext.SaveChanges();
result.AnswerSheet = ans;
}
return(result);
}
public LastAnswerSheetResult GetLastAnswerSheet(string sessionToken)
{
var result = new LastAnswerSheetResult();
var userId = _checkSessionToken(sessionToken, result);
if (userId.HasValue)
{
var answerSheets = mContext.AnswerSheet
.Where(a => a.IsClosed != true && a.UserId == userId)
.OrderByDescending(a => a.Id)
.ToArray();
Models.AnswerSheet lastAnswerSheet = null;
Models.Exam lastExam = null;
foreach (var item in answerSheets)
{
var exam = mContext.Exam.FirstOrDefault(e => e.Id == item.ExamId);
if (exam != null)
{
var deadline = item.CreatedAt.AddMinutes(exam.Time);
if (deadline < DateTime.Now && lastAnswerSheet == null)
{
lastAnswerSheet = item;
lastExam = exam;
}
else
{
item.IsClosed = true;
}
}
}
mContext.SaveChanges();
result.AnswerSheet = lastAnswerSheet;
result.Exam = lastExam;
}
return(result);
}
