import type { RequestEvent } from '@sveltejs/kit';
import { Agent } from '@atproto/api';
import { getOAuthClient } from './atproto/client';

export const sessionCookieName = 'atproto-session';

export async function getSessionAgent(event: RequestEvent) {
  const sessionDid = event.cookies.get(sessionCookieName);
  if (!sessionDid) return null;

  try {
    const oauthClient = await getOAuthClient();
    const oauthSession = await oauthClient.restore(sessionDid);
    return oauthSession ? new Agent(oauthSession) : null;
  } catch (err) {
    console.warn('OAuth restore failed:', err);
    event.cookies.delete(sessionCookieName, { path: '/' });
    return null;
  }
}

export function setSessionCookie(event: RequestEvent, did: string) {
  event.cookies.set(sessionCookieName, did, {
    path: '/',
    httpOnly: true,
    secure: process.env.NODE_ENV === 'production',
    sameSite: 'lax',
    maxAge: 60 * 60 * 24 * 30 // 30 days
  });
}

export function deleteSessionCookie(event: RequestEvent) {
  event.cookies.delete(sessionCookieName, {
    path: '/'
  });
}