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import type { Graduation } from "./graduation-common.ts";
import { Student } from "./student-common.ts";
import { getUserIconUrl, getCourseParticipantsUrl } from "./utils-prod.js";
import { fetchGraduation } from "./graduation-prod.ts";
declare module "./student-common.ts" {
interface Student {
getGraduation(): Promise<Graduation>;
getIconUrl(): Promise<string>;
}
}
Student.prototype.getGraduation = function () {
return fetchGraduation(this);
};
Student.prototype.getIconUrl = function () {
return getUserIconUrl(this.id);
};
// Cache the fetched students.
let students: Array<Student> | null = null;
const idRegex = /id=(\d+)/;
async function _fetchStudents() {
const res = await fetch(getCourseParticipantsUrl());
const doc = new DOMParser().parseFromString(await res.text(), "text/html");
const table = doc.querySelector("tbody")!;
const fetchedStudents: Array<Student> = [];
const rows = table.querySelectorAll("tr");
rows.forEach((row) => {
if (row.classList.contains("emptyrow")) return;
const roleCell = row.querySelector(".c4")!;
// TODO(muhq): Is this locale dependent?
if (roleCell.textContent.includes("Lehrer")) {
return;
}
const nameCell = row.querySelector<HTMLElement>(".c1")!;
let name;
const c = nameCell.firstChild!.firstChild! as HTMLElement;
if (c.tagName == "SPAN") name = c.title;
else name = nameCell.innerText;
const profileUrl = nameCell.querySelector<HTMLAnchorElement>("a.aabtn")!.href;
const match = idRegex.exec(profileUrl);
if (match === null) {
console.error("Profile Regex did not match");
return;
}
const id = match[1];
fetchedStudents.push(new Student(Number(id), name));
});
return fetchedStudents;
}
async function fetchStudents(idFilter?: number, nameFilter?: string) {
if (students === null) {
const studentsPromise = _fetchStudents();
const storedStudents = localStorage.getItem("students");
if (storedStudents !== null && storedStudents.length > 0) {
studentsPromise.then((fetched) => localStorage.setItem("students", JSON.stringify(fetched)));
students = [];
for (const o of JSON.parse(storedStudents)) {
students.push(new Student(o.id, o.name));
}
} else {
students = await studentsPromise;
localStorage.setItem("students", JSON.stringify(students));
}
}
return students.filter(
(s) =>
(typeof idFilter === "undefined" || s.id === idFilter) &&
(typeof nameFilter === "undefined" || s.name.includes(nameFilter))
);
}
async function fetchStudent(idFilter?: number, nameFilter?: string) {
const students = await fetchStudents(idFilter, nameFilter);
return students[0];
}
export { Student, fetchStudents, fetchStudent };
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