feat: export/import functionality (backup/restore/share with friends) + a new input component (#433)

* feat: export schedule function to be added to handler

* feat: use UserScheduleStore and return json

* feat: download functionality

* feat: oh wow we already have a blob download util that is very very nice

* feat: return empty json if none found

* feat: import function completion

* feat: file uploading done

* feat: new input component-stories made-settings input replaced with component

* feat: attempt 1 to hook settings.tsx to importSchedule

* feat: it works horray aka using right Course constructor it works

* chore: fix jsdoc

* chore: comments and debug style

* docs: extra comment

* feat: name of schedule more user friendly

* feat: reworked how schedule is passed and check for file being schedule

* feat: color is kept on import

* fix: add sendResponse to exportSchedule

---------

Co-authored-by: doprz <52579214+doprz@users.noreply.github.com>

src/pages/background/lib/importSchedule.ts

@@ -0,0 +1,35 @@
+import { Course } from '@shared/types/Course';
+import type { UserSchedule } from '@shared/types/UserSchedule';
+import type { Serialized } from 'chrome-extension-toolkit';
+
+import addCourse from './addCourse';
+import createSchedule from './createSchedule';
+import switchSchedule from './switchSchedule';
+
+function isValidSchedule(data: unknown): data is Serialized<UserSchedule> {
+    if (typeof data !== 'object' || data === null) return false;
+    const schedule = data as Record<string, unknown>;
+    return typeof schedule.id === 'string' && typeof schedule.name === 'string' && Array.isArray(schedule.courses);
+}
+
+/**
+ * Imports a user schedule from portable file, creating a new schedule for it
+
+ * @param scheduleData - Data to be parsed back into a course schedule
+ */
+export default async function importSchedule(scheduleData: unknown): Promise<void> {
+    if (isValidSchedule(scheduleData)) {
+        const newScheduleId = await createSchedule(scheduleData.name);
+        await switchSchedule(newScheduleId);
+
+        for (const c of scheduleData.courses) {
+            const course = new Course(c);
+            // eslint-disable-next-line no-await-in-loop
+            await addCourse(newScheduleId, course, true);
+            console.log(course.colors);
+        }
+        console.log('Course schedule successfully parsed!');
+    } else {
+        console.error('No schedule data provided for import');
+    }
+}