private IEnumerable <Course> GetUnlockedCourses(int studentId)
{
var completedCourses = studentCourseAssociationService.FindBy(x => x.StudentId == studentId).Select(x => x.Course).ToList();
var studentProgram = studentService.Get(studentId).Program;
var studentAllowedCourses = programCourseAssociationService.FindBy(x => x.ProgramId == studentProgram.Id).Select(x => x.Course).ToList();
var studentNewAllowedCourses = studentAllowedCourses.Where(x => !completedCourses.Select(y => y.Id).ToList().Contains(x.Id));
List <Course> unlockedCourses = new List <Course>();
foreach (var course in studentNewAllowedCourses)
{
var prerequisites = prerequisiteService.FindBy(x => x.CourseId == course.Id).ToList();
if (prerequisites == null || prerequisites.Count() == 0)
{
unlockedCourses.Add(course);
}
else
{
int prerequisiteCount = prerequisites.Count();
int counter = 0;
foreach (var prerequisite in prerequisites)
{
if (completedCourses.Select(x => x.Id).ToList().Contains(prerequisite.CoursePrerequisiteId.Value))
{
counter++;
}
}
if (counter == prerequisiteCount)
{
unlockedCourses.Add(course);
}
}
}
return(unlockedCourses);
}
