import { COURSES } from './courses';
import { ELECTIVE_SETS } from './electiveSets';
import type { Course, Qualification } from './types';

// Courses indexed by set ID
export const coursesBySet: Record<string, Course[]> = {};
for (const set of ELECTIVE_SETS) {
  coursesBySet[set.id] = set.courseIds.map(
    (cid) => COURSES.find((c) => c.id === cid)!
  );
}

// Qualifications indexed by course ID
export const qualificationsByCourse: Record<string, Qualification[]> = {};
for (const course of COURSES) {
  qualificationsByCourse[course.id] = course.qualifications;
}

// Course IDs indexed by specialization ID (with marker info)
export const coursesBySpec: Record<string, { courseId: string; marker: Qualification['marker'] }[]> = {};
for (const course of COURSES) {
  for (const q of course.qualifications) {
    if (!coursesBySpec[q.specId]) {
      coursesBySpec[q.specId] = [];
    }
    coursesBySpec[q.specId].push({ courseId: course.id, marker: q.marker });
  }
}

// Course lookup by ID
export const courseById: Record<string, Course> = {};
for (const course of COURSES) {
  courseById[course.id] = course;
}

// Set ID lookup by course ID
export const setIdByCourse: Record<string, string> = {};
for (const course of COURSES) {
  setIdByCourse[course.id] = course.setId;
}

// Cancelled course IDs
export const cancelledCourseIds = new Set(
  COURSES.filter((c) => c.cancelled).map((c) => c.id),
);

// Course IDs indexed by course name (for detecting duplicates across sets)
export const courseIdsByName: Record<string, string[]> = {};
for (const course of COURSES) {
  if (course.cancelled) continue;
  (courseIdsByName[course.name] ??= []).push(course.id);
}