more refactor

src/features/local/utils/semesterTransferUtils.ts

@@ -0,0 +1,124 @@
+import { LocalCoursePage } from "@/features/local/pages/localCoursePageModels";
+import { LocalAssignment } from "../assignments/models/localAssignment";
+import { Lecture } from "../lectures/lectureModel";
+import { LocalQuiz } from "@/features/local/quizzes/models/localQuiz";
+import { getDateFromStringOrThrow, dateToMarkdownString } from "./timeUtils";
+
+export const prepAssignmentForNewSemester = (
+  assignment: LocalAssignment,
+  oldSemesterStartDate: string,
+  newSemesterStartDate: string
+): LocalAssignment => {
+  const descriptionWithoutGithubClassroom = replaceClassroomUrl(
+    assignment.description
+  );
+  return {
+    ...assignment,
+    description: descriptionWithoutGithubClassroom,
+    dueAt:
+      newDateOffset(
+        assignment.dueAt,
+        oldSemesterStartDate,
+        newSemesterStartDate
+      ) ?? assignment.dueAt,
+    lockAt: newDateOffset(
+      assignment.lockAt,
+      oldSemesterStartDate,
+      newSemesterStartDate
+    ),
+    githubClassroomAssignmentLink: undefined,
+    githubClassroomAssignmentShareLink: undefined,
+  };
+};
+
+export const prepQuizForNewSemester = (
+  quiz: LocalQuiz,
+  oldSemesterStartDate: string,
+  newSemesterStartDate: string
+): LocalQuiz => {
+  const descriptionWithoutGithubClassroom = replaceClassroomUrl(
+    quiz.description
+  );
+  return {
+    ...quiz,
+    description: descriptionWithoutGithubClassroom,
+    dueAt:
+      newDateOffset(quiz.dueAt, oldSemesterStartDate, newSemesterStartDate) ??
+      quiz.dueAt,
+    lockAt: newDateOffset(
+      quiz.lockAt,
+      oldSemesterStartDate,
+      newSemesterStartDate
+    ),
+  };
+};
+
+export const prepPageForNewSemester = (
+  page: LocalCoursePage,
+  oldSemesterStartDate: string,
+  newSemesterStartDate: string
+): LocalCoursePage => {
+  const updatedText = replaceClassroomUrl(page.text);
+  return {
+    ...page,
+    text: updatedText,
+    dueAt:
+      newDateOffset(page.dueAt, oldSemesterStartDate, newSemesterStartDate) ??
+      page.dueAt,
+  };
+};
+export const prepLectureForNewSemester = (
+  lecture: Lecture,
+  oldSemesterStartDate: string,
+  newSemesterStartDate: string
+): Lecture => {
+  const updatedText = replaceClassroomUrl(lecture.content);
+  const newDate = newDateOffset(
+    lecture.date,
+    oldSemesterStartDate,
+    newSemesterStartDate
+  );
+  const newDateOnly = newDate?.split(" ")[0];
+  return {
+    ...lecture,
+    content: updatedText,
+    date: newDateOnly ?? lecture.date,
+  };
+};
+
+const replaceClassroomUrl = (value: string) => {
+  const classroomPattern =
+    /https:\/\/classroom\.github\.com\/[a-zA-Z0-9\/._-]+/g;
+  const withoutGithubClassroom = value.replace(
+    classroomPattern,
+    "insert_github_classroom_url"
+  );
+  return withoutGithubClassroom;
+};
+
+const newDateOffset = (
+  dateString: string | undefined,
+  oldSemesterStartDate: string,
+  newSemesterStartDate: string
+) => {
+  if (!dateString) return dateString;
+  const oldStart = getDateFromStringOrThrow(
+    oldSemesterStartDate,
+    "semester start date in new semester offset"
+  );
+  const newStart = getDateFromStringOrThrow(
+    newSemesterStartDate,
+    "new semester start date in new semester offset"
+  );
+  const date = getDateFromStringOrThrow(
+    dateString,
+    "date in new semester offset"
+  );
+  const offset = date.getTime() - oldStart.getTime();
+
+  const newUnixTime = offset + newStart.getTime();
+
+  const newDate = new Date(newUnixTime);
+
+  return dateToMarkdownString(newDate);
+};