import sys
import course_dictionary

def main(argv):
    test = course_dictionary.create_course_dict()
    #Test to see if all prereqs are in the file.
    prereq_list = [single_course for vals in test.values()
                   for some_prereqs in vals.prereqs for single_course in some_prereqs]
    for prereq in prereq_list:
        if prereq not in test:
            print(prereq)
    for key in test:
        #Test to see if every course has a term and credits.
        if not test[key].terms or not test[key].credits:
            print(key)
        #Test to see if a course's prereqs include the course itself
        if key in [course for prereq in test[key].prereqs for course in prereq]:
            print(key);
    # Prints all the CS courses.
    # for key in test:
    #     if key.program == 'CS':
    #         print(key, test[key])
    #Prints the entire dictionary.
    # course_dictionary.print_dict(test)
    # print(test[('CS', 'open3')])
    print('Done')

if __name__ == "__main__":
    main(sys.argv)