wrote all course/schedule background messages with handlers

src/shared/messages/UserScheduleMessages.ts

@@ -1,7 +1,44 @@
 import { Course } from '../types/Course';
 
 export interface UserScheduleMessages {
+    /**
+     * Add a course to a schedule
+     * @param data the schedule name and course to add
+     */
     addCourse: (data: { scheduleName: string; course: Course }) => void;
-
+    /**
+     * Remove a course from a schedule
+     * @param data the schedule name and course to remove
+     */
     removeCourse: (data: { scheduleName: string; course: Course }) => void;
+    /**
+     * Clears all courses from a schedule
+     * @param data the name of the schedule to clear
+     */
+    clearCourses: (data: { scheduleName: string }) => void;
+
+    /**
+     * Switches the active schedule to the one specified
+     * @param data the name of the schedule to switch to
+     */
+    switchSchedule: (data: { scheduleName: string }) => void;
+
+    /**
+     * Creates a new schedule with the specified name
+     * @param data the name of the schedule to create
+     * @returns undefined if successful, otherwise an error message
+     */
+    createSchedule: (data: { scheduleName: string }) => string | undefined;
+    /**
+     * Deletes a schedule with the specified name
+     * @param data the name of the schedule to delete
+     * @returns undefined if successful, otherwise an error message
+     */
+    deleteSchedule: (data: { scheduleName: string }) => string | undefined;
+    /**
+     * Renames a schedule with the specified name
+     * @param data the name of the schedule to rename and the new name
+     * @returns undefined if successful, otherwise an error message
+     */
+    renameSchedule: (data: { scheduleName: string; newName: string }) => string | undefined;
 }