public IHttpActionResult UpdateCourse(int id, CourseCreator courseCreator)
{
coursesService = new CoursesService();
courseToExposeService = new CourseToExposeService();
if (courseCreator == null)
{
return(NotFound());
}
if (courseCreator.SubjectIds.Count() > 5)
{
return(BadRequest());
}
// check if course exists; if it doesn't, send NotFound()
Course courseToUpdate = coursesService.GetCourseByCourseId(id);
if (courseToUpdate == null)
{
return(BadRequest());
}
// check if title changed and if so update it
courseToUpdate = coursesService.UpdateTitle(id, courseCreator.Title);
if (courseToUpdate == null)
{
return(BadRequest());
}
// list of subjects of course before update
List <int> oldSubjectList = coursesService.GetCourseSubjectsIds(courseToUpdate);
// new list of subjects
List <int> newSubjectList = courseCreator.SubjectIds;
// compare list of subjects
List <int> subjectsToRemove = new List <int>();
List <int> subjectsToAdd = new List <int>();
foreach (int oldSubject in oldSubjectList)
{
if (!newSubjectList.Contains(oldSubject))
{
subjectsToRemove.Add(oldSubject);
}
}
foreach (int newSubject in newSubjectList)
{
if (!oldSubjectList.Contains(newSubject))
{
subjectsToAdd.Add(newSubject);
}
}
// create courseSubjects to new subjects
List <CourseSubject> newCourseSubjects = coursesService
.CreateCourseSubjectsByIdAndListOfSubjects(courseToUpdate.Id, subjectsToAdd);
// remove course subjects
coursesService.RemoveCourseSubjetcsByListOfSubjects(id, subjectsToRemove);
// create List of subjects to expose
List <Subject> subjectsToTrim = coursesService.GetSubjects(newSubjectList);
List <SubjectToExpose> subjectsToExpose = coursesService.TrimSubjects(subjectsToTrim);
// create Course to expose
CourseToExpose courseToExpose = courseToExposeService
.TrimUpdateCourse(id, courseCreator, subjectsToExpose);
return(Ok(courseToExpose));
}