//Move material one position up in the course
public ResponseState MaterialPositionInCourseUp(int materialId, int courseId)
{
var materialsCourse = this.repository.Where <MaterialCourse>(x => x.CourseId == courseId).OrderBy(x => x.Position).ToList();
var value = materialsCourse.FirstOrDefault(x => x.Id == materialId);
if (materialsCourse != null && value != null)
{
MaterialCourse prev = null;
if (materialsCourse.Count > 1)
{
for (int i = 0; i < materialsCourse.Count; i++)
{
if (materialsCourse[i].Id == materialId && materialsCourse[i].CourseId == courseId)
{
if ((i - 1) < 0)
{
prev = materialsCourse[materialsCourse.Count - 1];
}
else
{
prev = materialsCourse[i - 1];
}
}
}
}
if (prev != null)
{
int positionPrev = prev.Position;
prev.Position = value.Position;
value.Position = positionPrev;
this.repository.Update <MaterialCourse>(prev);
this.repository.Update <MaterialCourse>(value);
this.repository.SaveChanges();
return(new ResponseState {
State = true, Massage = $"OK"
});
}
return(new ResponseState {
State = false, Massage = $"CourseHaveOneElement"
});
}
return(new ResponseState {
State = false, Massage = $"CourseNotFound"
});
}
//Removes material from a course.
public ResponseState DeleteMaterialFromCourse(int courseId, int materialId)
{
MaterialCourse materialCourse = this.repository.FirstOrDefault <MaterialCourse>(x => x.CourseId == courseId && x.Id == materialId);
if (materialCourse != null)
{
this.repository.Delete <MaterialCourse>(materialCourse);
this.repository.SaveChanges();
return(new ResponseState {
State = true, Massage = "OK"
});
}
return(new ResponseState {
State = false, Massage = "MaterialCourseIsAbsent"
});
}
