import express from 'express';
import type { AddressInfo } from 'node:net';
import { afterEach, describe, expect, it, vi } from 'vitest';
import type { WebContext } from '../../src/web/context.js';
import { createMediaRouter } from '../../src/web/routes/media.js';

const servers: Array<ReturnType<express.Express['listen']>> = [];

async function request(app: express.Express, path: string): Promise<Response> {
  const server = app.listen(0);
  servers.push(server);
  await new Promise<void>((resolve) => server.once('listening', resolve));
  const { port } = server.address() as AddressInfo;
  return fetch(`http://127.0.0.1:${port}${path}`);
}

afterEach(async () => {
  await Promise.all(servers.splice(0).map((server) => new Promise<void>((resolve) => server.close(() => resolve()))));
});

describe('media route username presentation', () => {
  it('upgrades historical t2 fields through the chat username map', async () => {
    const context = {
      logger: { error: vi.fn() },
      services: {
        media: { getMediaItems: vi.fn().mockResolvedValue([{
          id: 'one', chatUsername: 't2_known', chatRoomId: 'room-one', sender: 't2_known',
          timestamp: 1, originalUrl: 'mxc://one', fileName: 'one.jpg', relativePath: 'one.jpg', createdAt: 2,
        }]) },
        chat: {
          getCachedConversations: vi.fn().mockResolvedValue([]),
          resolveSenderDisplay: vi.fn((identity: string) => identity === 't2_known' ? 'alice' : identity),
        },
      },
    } as unknown as WebContext;
    const app = express().use('/api', createMediaRouter(context));

    const response = await request(app, '/api/media');

    expect(response.status).toBe(200);
    expect(await response.json()).toEqual([expect.objectContaining({ chatUsername: 'alice', sender: 'alice' })]);
  });

  it('uses a safe fallback when no username mapping exists', async () => {
    const context = {
      logger: { error: vi.fn() },
      services: {
        media: { getMediaItems: vi.fn().mockResolvedValue([{
          id: 'one', chatUsername: 't2_missing', chatRoomId: 'room-one', sender: '@t2_missing:reddit.com',
          timestamp: 1, originalUrl: 'mxc://one', fileName: 'one.jpg', relativePath: 'one.jpg', createdAt: 2,
        }]) },
        chat: {
          getCachedConversations: vi.fn().mockResolvedValue([]),
          resolveSenderDisplay: vi.fn((identity: string) => identity),
        },
      },
    } as unknown as WebContext;
    const app = express().use('/api', createMediaRouter(context));

    const response = await request(app, '/api/media');
    const body = await response.json();

    expect(JSON.stringify(body)).not.toContain('t2_missing');
    expect(body[0]).toMatchObject({ chatUsername: null, sender: 'Unknown Reddit user' });
  });
});