feat:#40 added semester selection by month

frontend/src/view/CourseSelection.vue

@@ -26,6 +26,19 @@ async function getCourses() {
       return { name: course };
     });
   });
+
+  // replace selected course if it is not available in the new courses list
+  if (
+    selectedCourse.value.name !== "" &&
+    !courses.value.some((course) => course.name === selectedCourse.value.name)
+  ) {
+    selectedCourse.value = { name: "" };
+  }
+  // if course is selected, get the modules for the selected course
+  if (selectedCourse.value.name !== "") {
+    await getModules();
+  }
+
 }
 
 const store = moduleStore();
@@ -42,10 +55,14 @@ const semesters: ComputedRef<{ name: string; value: string }[]> = computed(
   ],
 );
 
+// return current semester summer form march to august and winter from september to february
+const currentSemester: { name: string; value: string } = new Date().getMonth() >= 2 && new Date().getMonth() <= 7 ? semesters.value[1] : semesters.value[0];
+
 const selectedSemester: Ref<{ name: string; value: string }> = ref(
-  semesters.value[0],
+  currentSemester
 );
 
+
 //if semesters get changed, refresh the selected semester ref with a watcher
 watch(
   semesters,