import { Accessor, createMemo, createSignal } from "solid-js";
import { Course } from "../types/Course";

type CourseMap = {[k: number]: Course};

export const [allCourses, setAllCourses] = createSignal<Array<Course>>([]);
export const [courseMap, setCourseMap] = createSignal<CourseMap>({});

(() => {
    // Get all courses from the API
    fetch(`${import.meta.env.VITE_BACKEND_URL}/api/course`)
        .then((res) => res.json())
        .then((data: Array<Course>) => {
            setAllCourses(data);

            const map: CourseMap = {};
            for (const course of data) {
                map[course.course_id] = course;
            }
            setCourseMap(map);
        });
})();

export function getCourseMemo(name: string): Accessor<Course | null> {
    return createMemo(() => {
        const course = allCourses().find((course) => course.course_name === name);
        if (course) {
            return course;
        }
        return null;
    });
}