import { Hono } from 'hono';
import { errors as joseErrors } from 'jose';
import { beforeAll, describe, expect, it } from 'vitest';
import { makeToken, setupTestJwks } from '../support/token';
import { classifyAuthError, requireAuth, requireRealmRole, requireService } from '../../src/shared/keycloak-auth';

function appWith(...mw: Parameters<Hono['use']>[1][]): Hono {
  const app = new Hono();
  for (const m of mw) app.use('/p/*', m);
  app.get('/p/x', (c) => c.json({ user: c.get('user') }));
  return app;
}

describe('keycloak-auth', () => {
  beforeAll(async () => {
    await setupTestJwks();
  });

  it('缺 Bearer → 401 unauthorized', async () => {
    const res = await appWith(requireAuth()).request('/p/x');
    expect(res.status).toBe(401);
    expect(((await res.json()) as { error: string }).error).toBe('unauthorized');
  });

  it('合法 token → 200 且 user 就位', async () => {
    const token = await makeToken({ sub: 'u-1', roles: ['user'] });
    const res = await appWith(requireAuth()).request('/p/x', {
      headers: { authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(200);
    const body = (await res.json()) as { user: { id: string; roles: string[] } };
    expect(body.user.id).toBe('u-1');
    expect(body.user.roles).toContain('user');
  });

  it('aud 不含本服务 → 401 invalid_token 且 message 点名 audience mapper', async () => {
    const token = await makeToken({ aud: 'some-other-service' });
    const res = await appWith(requireAuth()).request('/p/x', {
      headers: { authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(401);
    expect(((await res.json()) as { message: string }).message).toContain('audience mapper');
  });

  it('过期 token → 401 且 message 为 token 已过期', async () => {
    const token = await makeToken({ expiresIn: -60 });
    const res = await appWith(requireAuth()).request('/p/x', {
      headers: { authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(401);
    expect(((await res.json()) as { message: string }).message).toContain('过期');
  });

  it('角色不够 → 403（401/403 语义分明）', async () => {
    const token = await makeToken({ roles: ['user'] });
    const res = await appWith(requireAuth(), requireRealmRole('admin')).request('/p/x', {
      headers: { authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(403);
  });

  it('admin 通过 requireRealmRole(user, admin) 任一命中', async () => {
    const token = await makeToken({ roles: ['admin'] });
    const res = await appWith(requireAuth(), requireRealmRole('user', 'admin')).request('/p/x', {
      headers: { authorization: `Bearer ${token}` },
    });
    expect(res.status).toBe(200);
  });

  it('I4：token 类失败 → 401；JWKS/网络类失败 → 503（不把停机说成凭据无效）', () => {
    // token 类：换张票才有意义
    expect(classifyAuthError(new joseErrors.JWTExpired('exp', {}))).toBe(401);
    expect(classifyAuthError(new joseErrors.JWTClaimValidationFailed('aud', {}, 'aud'))).toBe(401);
    expect(classifyAuthError(new joseErrors.JWTInvalid('不是 JWT'))).toBe(401);
    expect(classifyAuthError(new joseErrors.JWSSignatureVerificationFailed())).toBe(401);
    expect(classifyAuthError(new joseErrors.JWKSNoMatchingKey())).toBe(401);
    // 基础设施类：只有重试才有意义。回 401 会把客户端赶去重新登录，而登录打的是同一个
    // 连不上的 Keycloak——排障时看到的也只是一片"凭据无效"，而非依赖不可用。
    expect(classifyAuthError(new TypeError('fetch failed'))).toBe(503);
    expect(classifyAuthError(new joseErrors.JWKSTimeout())).toBe(503);
    expect(classifyAuthError(new joseErrors.JWKSInvalid('JWKS 结构不对'))).toBe(503);
    expect(classifyAuthError(new joseErrors.JOSEError('Expected 200 OK from the JSON Web Key Set HTTP response'))).toBe(503);
    expect(classifyAuthError('连字符串都不是')).toBe(503);
  });

  it('requireService：service 角色＋azp 白名单', async () => {
    const svc = await makeToken({
      roles: ['service'], azp: 'task-dispatcher', username: 'service-account-task-dispatcher',
    });
    const ok = await appWith(requireAuth(), requireService(['task-dispatcher'])).request('/p/x', {
      headers: { authorization: `Bearer ${svc}` },
    });
    expect(ok.status).toBe(200);
    const wrongAzp = await makeToken({
      roles: ['service'], azp: 'agent-service', username: 'service-account-agent-service',
    });
    const deny = await appWith(requireAuth(), requireService(['task-dispatcher'])).request('/p/x', {
      headers: { authorization: `Bearer ${wrongAzp}` },
    });
    expect(deny.status).toBe(403);
  });
});