export const STUDENT_DEMO_STORAGE_KEY = "student-demo-session";

export function getStudentDemoSession() {
  try {
    const value = sessionStorage.getItem(STUDENT_DEMO_STORAGE_KEY);
    return value ? JSON.parse(value) : null;
  } catch (error) {
    return null;
  }
}

export function isStudentDemo() {
  return Boolean(getStudentDemoSession()?.token);
}

export function saveStudentDemoSession(login) {
  sessionStorage.setItem(STUDENT_DEMO_STORAGE_KEY, JSON.stringify({
    token: login.token,
    userInfo: login,
    expiresAt: Date.now() + 30 * 60 * 1000,
  }));
}

export function clearStudentDemoSession() {
  sessionStorage.removeItem(STUDENT_DEMO_STORAGE_KEY);
}

export function getDemoAnswerKey(taskKey) {
  return `student-demo-answer:${getStudentDemoSession()?.userInfo?.demoTeachingClassId || ""}:${taskKey}`;
}