import { cookies } from 'next/headers';
import { redirect } from 'next/navigation';
import { prisma } from '@/lib/db';

const SESSION_COOKIE = 'candidatesession';
const SESSION_DURATION_MS = 30 * 24 * 60 * 60 * 1000; // 30 days

export async function getSessionCandidateId(): Promise<string | null> {
  const cookieStore = await cookies();
  const sessionId = cookieStore.get(SESSION_COOKIE)?.value;
  if (!sessionId) return null;

  const session = await prisma.session.findUnique({
    where: { id: sessionId },
  });
  if (!session || session.expiresAt < new Date()) {
    return null;
  }

  return session.candidateId;
}

export async function requireCandidate(): Promise<string> {
  const id = await getSessionCandidateId();
  if (!id) {
    redirect('/registrarme');
  }
  return id;
}

export async function createCandidateSession(candidateId: string): Promise<string> {
  const { randomUUID } = await import('node:crypto');
  const id = randomUUID();
  const expiresAt = new Date(Date.now() + SESSION_DURATION_MS);

  await prisma.session.create({
    data: { id, candidateId, expiresAt },
  });

  return id;
}

export function sessionCookieHeader(sessionId: string): string {
  const maxAge = SESSION_DURATION_MS / 1000;
  return `${SESSION_COOKIE}=${sessionId}; HttpOnly; SameSite=Lax; Path=/; Max-Age=${maxAge}`;
}

export function clearSessionCookieHeader(): string {
  return `${SESSION_COOKIE}=; HttpOnly; SameSite=Lax; Path=/; Max-Age=0`;
}