First commit

lib/data/courseCatalog.ts

@@ -0,0 +1,20 @@
+import { mockCourses } from "@/lib/data/mockCourses";
+import { getTeacherCourseBySlug, getTeacherCourses } from "@/lib/data/teacherCourses";
+import type { Course } from "@/types/course";
+
+export const getAllCourses = (): Course[] => {
+  const teacherCourses = getTeacherCourses();
+  if (teacherCourses.length === 0) return mockCourses;
+
+  const teacherSlugs = new Set(teacherCourses.map((course) => course.slug));
+  const baseCourses = mockCourses.filter((course) => !teacherSlugs.has(course.slug));
+  return [...baseCourses, ...teacherCourses];
+};
+
+export const getCourseBySlug = (slug: string): Course | undefined => {
+  const teacher = getTeacherCourseBySlug(slug);
+  if (teacher) return teacher;
+  return mockCourses.find((course) => course.slug === slug);
+};
+
+export const getAllCourseSlugs = (): string[] => getAllCourses().map((course) => course.slug);