/// <summary>
/// Update command for when a student enrolls in a course based on the course ID and if the user is logged in under the correct role of student.
///
/// If there are validation exceptions, add them to validation exception list.
/// </summary>
/// <param name="courseID"></param>
/// <param name="userIndentity"></param>
public void RegisterCourse(int courseID)
{
using (LearningManagementContext context = new LearningManagementContext())
{
Course enrollCourse = context.Courses.Where(x => x.ID == courseID).SingleOrDefault();
if (User.Identity.Name == null)
{
exception.ValidationExceptions.Add(new Exception("Please sign-in to enroll"));
}
else
{
User userRoll = context.Users.Where(x => x.Role == 3 && x.ID == int.Parse(User.Identity.Name)).SingleOrDefault();
if (userRoll == null)
{
exception.ValidationExceptions.Add(new Exception("You must be a student to enroll"));
}
else
{
if (context.Students.Any(x => x.CourseID == courseID && x.UserID == int.Parse(User.Identity.Name)))
{
exception.ValidationExceptions.Add(new Exception("You have already enrolled for this course."));
}
else
{
if (enrollCourse.CurrentCapacity >= enrollCourse.MaxCapacity)
{
exception.ValidationExceptions.Add(new Exception("Sorry, the course you are registering for is already full"));
}
else
{
if (enrollCourse.EndDate <= DateTime.Today)
{
exception.ValidationExceptions.Add(new Exception("Sorry, that course has already ended."));
}
}
}
}
}
if (exception.ValidationExceptions.Count > 0)
{
throw exception;
}
context.Students.Add(new Student()
{
UserID = int.Parse(User.Identity.Name),
CourseID = courseID,
});
enrollCourse.CurrentCapacity += 1;
context.SaveChanges();
}
}
/// <summary>
/// Function to enter the Answer of an assignment in the database by Student
/// </summary>
/// <param name="id"></param>
/// <param name="answer"></param>
/// <param name="courseID"></param>
public void SubmitAssignment(string id, string answer, string courseID)
{
ValidationException exception = new ValidationException();
bool flag = false;
int parsedId;
// Trim the values
id = id?.Trim();
answer = answer?.Trim();
courseID = courseID?.Trim();
// Validation for Assignment ID
if (id == null || courseID == null)
{
exception.ValidationExceptions.Add(new Exception("ID not found, Go back to details page and try again"));
flag = true;
}
else
{
if (!int.TryParse(id, out parsedId))
{
exception.ValidationExceptions.Add(new Exception("Invalid Course ID : Go back to main instructor dsahboard and select course again"));
flag = true;
}
}
// Validation for answer
if (answer == null)
{
exception.ValidationExceptions.Add(new Exception("Invalid Value : Answer Required"));
flag = true;
}
else
{
if (answer.Length > 2000)
{
exception.ValidationExceptions.Add(new Exception("Invalid value : cannot exceed character count of 2000, please rephrase"));
flag = true;
}
}
if (exception.ValidationExceptions.Count > 0)
{
throw exception;
}
if (flag == false)
{
using (LearningManagementContext context = new LearningManagementContext())
{
// Add Values in assignment Table if all validations are passed
context.Submissions.Add(new Submit()
{
AssignmentID = int.Parse(id),
StudentID = GetStudentId(courseID, User.Identity.Name),
DateSubmitted = DateTime.Now,
Answer = answer
});
context.SaveChanges();
}
}
}
/// <summary>
/// Function to update the Score and remarks in submit, table these fields are added by instructor
/// </summary>
/// <param name="submitId"></param>
/// <param name="remarks"></param>
/// <param name="scoreObtained"></param>
/// <param name="totalScore"></param>
public void SubmitAssignmentScoreAndRemarks(string submitId, string remarks, string scoreObtained, string totalScore)
{
ValidationException exception = new ValidationException();
Submit updateSubmission = null;
submitId = submitId?.Trim();
remarks = remarks?.Trim();
scoreObtained = scoreObtained?.Trim();
totalScore = totalScore?.Trim();
bool flag = false;
int parsedId;
int parsedScoreObtained;
int parsedTotalScore;
// Validation for submitID
if (!int.TryParse(submitId, out parsedId))
{
exception.ValidationExceptions.Add(new Exception("Invalid submission ID : go back to course list and try again"));
flag = true;
}
// Validation for Total Score
if (!int.TryParse(totalScore, out parsedTotalScore))
{
exception.ValidationExceptions.Add(new Exception("Invalid value: total score required"));
flag = true;
}
// Validation for remarks
if (remarks != null)
{
if (remarks.Length > 500)
{
exception.ValidationExceptions.Add(new Exception("Invalid value : cannot exceed character count of 500, please rephrase"));
flag = true;
}
}
// Validation for Score obtained
if (!int.TryParse(scoreObtained, out parsedScoreObtained))
{
exception.ValidationExceptions.Add(new Exception("Invalud value : numeric Value required for score obtained"));
flag = true;
}
else
{
if (!((parsedScoreObtained > -1) && (parsedScoreObtained < parsedTotalScore + 1)))
{
exception.ValidationExceptions.Add(new Exception($"Invalid value : enter total score between 0 and {parsedTotalScore}"));
flag = true;
}
}
if (flag == false)
{
using (LearningManagementContext context = new LearningManagementContext())
{
updateSubmission = context.Submissions.Where(x => x.ID == int.Parse(submitId)).SingleOrDefault();
updateSubmission.ScoreObtained = int.Parse(scoreObtained);
updateSubmission.Remarks = remarks;
context.SaveChanges();
}
}
if (exception.ValidationExceptions.Count > 0)
{
throw exception;
}
}
/// <summary>
/// Function to insert assignment values by instructor into assignment table
/// Validation # 1 : Due Date for assignment Cannot be before Course start date
/// Validation # 2 : Due date for assignment cannot be set before today
/// Validation # 3 : Due date cannot be after Course end date
/// </summary>
/// <param name="question"></param>
/// <param name="dueDate"></param>
/// <param name="totalScore"></param>
/// <param name="id"></param>
public void CreateNewAssignment(string question, string dueDate, string totalScore, string id)
{
ValidationException exception = new ValidationException();
// Trim the values
question = question?.Trim();
dueDate = dueDate?.Trim();
totalScore = totalScore?.Trim();
id = id?.Trim();
bool flag = false;
int parsedId;
int parsedTotalScore;
// Validation for courseID
if (id == null)
{
exception.ValidationExceptions.Add(new Exception("Invalid ID : Go back to details page and try again"));
flag = true;
}
else
{
if (!int.TryParse(id, out parsedId))
{
exception.ValidationExceptions.Add(new Exception("Invalid Course ID : Go back to main Instructor Dsahboard and select course again"));
flag = true;
}
}
// Validation for question
if (question == null)
{
exception.ValidationExceptions.Add(new Exception("Invalid Value : Question Required"));
flag = true;
}
else
{
if (question.Length > 500)
{
exception.ValidationExceptions.Add(new Exception("Invalid character count : cannot exceed 500 characters, please rephrase"));
flag = true;
}
}
// Validation for dueDate
if (dueDate == null)
{
exception.ValidationExceptions.Add(new Exception("Invalid Date : Due Date Required"));
flag = true;
}
else
{
if (DateTime.Parse(dueDate) < DateTime.Now)
{
exception.ValidationExceptions.Add(new Exception("Invalid Date : Due Date Can not be set prior to today"));
flag = true;
}
}
// Validation for TotalScore
if (totalScore == null)
{
exception.ValidationExceptions.Add(new Exception("Invalid Score : total score for assignment required"));
flag = true;
}
else
{
if (!int.TryParse(totalScore, out parsedTotalScore))
{
exception.ValidationExceptions.Add(new Exception("Invalid Value : Numeric Value required for total score"));
flag = true;
}
else
{
if (!((parsedTotalScore > -1) && (parsedTotalScore < 101)))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : enter total score between 0 and 100"));
flag = true;
}
}
}
if (flag == false)
{
using (LearningManagementContext context = new LearningManagementContext())
{
Course course = GetCourseDetailsByID(id);
if (DateTime.Parse(dueDate) < course.StartDate)
{
exception.ValidationExceptions.Add(new Exception("Invalid Due date : due date for an assignment cannot be before course start date"));
flag = true;
}
else
if (DateTime.Parse(dueDate) > course.EndDate)
{
exception.ValidationExceptions.Add(new Exception($"Invalid Due date : due date for an assignment cannot be later than course end date {course.EndDate}"));
flag = true;
}
if (flag == false)
{
// Add Values in assignment Table if all validations are passed
context.Assignments.Add(new Assignment()
{
CourseID = int.Parse(id),
Question = question,
DueDate = DateTime.Parse(dueDate),
TotalScore = int.Parse(totalScore)
});
context.SaveChanges();
}
}
}
if (exception.ValidationExceptions.Count > 0)
{
throw exception;
}
}
/* ----------------------------------------------- Data ------------------------------------------*/
/// <summary>
/// Function To add Validated user credentials in User database
/// </summary>
/// <param name="firstName"></param>
/// <param name="lastName"></param>
/// <param name="email"></param>
/// <param name="password"></param>
/// <param name="role"></param>
public void Register(string firstName, string lastName, string email, string password, string role)
{
ValidationException exception = new ValidationException();
// Trim the values
firstName = firstName?.Trim();
lastName = lastName?.Trim();
email = email?.Trim();
password = password?.Trim();
role = role?.Trim();
bool flag = false;
// Validation for First Name
if (string.IsNullOrWhiteSpace(firstName))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : First Name Not Provided"));
flag = true;
}
else if (firstName.Length > 50)
{
exception.ValidationExceptions.Add(new Exception("Invalid value : First Name Cannot exceed 50 characters"));
flag = true;
}
// Validation for Last Name
if (string.IsNullOrWhiteSpace(lastName))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Last Name Not Provided"));
flag = true;
}
else if (lastName.Length > 50)
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Last Name Cannot exceed 50 characters"));
flag = true;
}
// Validation for Email
if (string.IsNullOrWhiteSpace(email))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Email Not Provided"));
flag = true;
}
else if (email.Length > 50)
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Email Cannot exceed 50 characters"));
flag = true;
}
else if (!Regex.IsMatch(email, @"^[\w-!$*%^\.]+@([\w-]+\.)+[\w-]{2,4}$"))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Incorrect Email Address "));
flag = true;
}
// Validation for Password
if (string.IsNullOrWhiteSpace(password))
{
exception.ValidationExceptions.Add(new Exception("Invalid value : Password Not Provided"));
flag = true;
}
else if (password.Length > 50)
{
exception.ValidationExceptions.Add(new Exception(" Invalid value : Password Cannot exceed 50 characters"));
flag = true;
}
if (string.IsNullOrWhiteSpace(role))
{
exception.ValidationExceptions.Add(new Exception("Please Select a Role"));
flag = true;
}
if (flag == false)
{
using (LearningManagementContext context = new LearningManagementContext())
{
// Checking for Email duplication
if ((context.Users.Where(x => (x.EMail.Trim().ToUpper()) == email.ToUpper()).Count()) > 0)
{
exception.ValidationExceptions.Add(new Exception("Email already exist, Try again with a new one"));
flag = true;
}
if (flag == false)
{
// Add Values in user Table if all validations are passed
context.Users.Add(new User()
{
FirstName = firstName,
LastName = lastName,
EMail = email.ToUpper(),
Password = SignInController.HashAndSaltPassowrd(password, email.ToUpper()),
Role = int.Parse(role),
JoinDate = DateTime.Now
});
context.SaveChanges();
}
}
}
if (exception.ValidationExceptions.Count > 0)
{
throw exception;
}
}