import 'reflect-metadata';

import { INestApplication } from '@nestjs/common';
import { PATH_METADATA } from '@nestjs/common/constants';
import { PrismaClient } from '@prisma/client';
import request from 'supertest';
import { afterAll, beforeAll, describe, expect, it } from 'vitest';

import { createTestApp } from '../testing/test-app';
import { createTestPrisma, hasTestDb, uniqueSuffix } from '../testing/test-db';
import { UsersService } from '../users/users.service';

import { LOCAL_CREDENTIAL_KEY } from './auth.guard';
import { AuthController } from './auth.controller';
import { OidcController } from './oidc.controller';
import { SessionsService } from './sessions.service';

/**
 * The hard local-auth switch (issue #216, ADR 0021): AUTH_LOCAL_ENABLED=false
 * closes EVERY local credential flow with 404 — enumerated, not assumed —
 * while sessions themselves, logout, and token issuance for
 * externally-authenticated users keep working (the stated decision: PATs
 * and feed tokens authorize API access under their own switches, they are
 * not interactive sign-in). A fence asserts every auth route is either
 * marked as a local flow or on the reviewed allowlist.
 */
describe.skipIf(!hasTestDb)('local-auth switch (e2e, issue #216)', () => {
  let app: INestApplication;
  let prisma: PrismaClient;
  const suffix = uniqueSuffix();

  /** Every local credential surface — the enumeration the issue demands. */
  const LOCAL_ROUTES: { method: 'post'; path: string; body: Record<string, unknown> }[] = [
    { method: 'post', path: '/api/v1/auth/login', body: { usernameOrEmail: 'x', password: 'y' } },
    {
      method: 'post',
      path: '/api/v1/auth/signup',
      body: {
        username: `switch-${suffix}`,
        email: `switch-${suffix}@example.test`,
        displayName: 'x',
        password: 'ein langes passwort 123',
        locale: 'en',
      },
    },
    { method: 'post', path: '/api/v1/auth/verify-email', body: { token: 'x' } },
    {
      method: 'post',
      path: '/api/v1/auth/resend-verification',
      body: { email: 'x@example.test' },
    },
    { method: 'post', path: '/api/v1/auth/forgot-password', body: { email: 'x@example.test' } },
    {
      method: 'post',
      path: '/api/v1/auth/reset-password',
      body: { token: 'x', password: 'ein langes passwort 123' },
    },
    {
      method: 'post',
      path: '/api/v1/users/me/change-password',
      body: { currentPassword: 'x', newPassword: 'ein langes passwort 123' },
    },
  ];

  const api = () => request(app.getHttpServer());

  beforeAll(async () => {
    prisma = createTestPrisma();
    await prisma.rateLimit.deleteMany({});
    process.env.AUTH_LOCAL_ENABLED = 'false';
    app = await createTestApp();
  });

  afterAll(async () => {
    delete process.env.AUTH_LOCAL_ENABLED;
    await prisma.apiToken.deleteMany({ where: { user: { username: { contains: suffix } } } });
    await prisma.feedToken.deleteMany({ where: { user: { username: { contains: suffix } } } });
    await prisma.user.deleteMany({ where: { username: { contains: suffix } } });
    await prisma.$disconnect();
    await app.close();
  });

  it('answers 404 on every enumerated local credential route', async () => {
    for (const route of LOCAL_ROUTES) {
      const res = await api()[route.method](route.path).send(route.body);
      expect(`${route.path}: ${res.status}`).toBe(`${route.path}: 404`);
    }
  });

  it('reports local:false so the login screen hides the form', async () => {
    const res = await api().get('/api/v1/auth/methods').expect(200);
    expect(res.body.local).toBe(false);
  });

  it('keeps sessions, logout, and PAT/feed-token issuance working for externally-authenticated users', async () => {
    // An externally-authenticated user is simulated by creating the session
    // through the session service — exactly what the OIDC/proxy paths do.
    const users = app.get(UsersService);
    const user = await users.createUser({
      username: `ext-${suffix}`,
      email: `ext-${suffix}@example.test`,
      displayName: 'External',
      password: 'nie benutzt weil lokal aus',
      locale: 'en',
    });
    await users.markEmailVerified(user.id);
    const token = await app.get(SessionsService).create(user.id, undefined);
    const cookie = `dt_session=${token}`;

    const me = await api().get('/api/v1/auth/me').set('Cookie', cookie).expect(200);
    expect(me.body.id).toBe(user.id);

    // Stated decision (#216): token issuance is API authorization, not
    // interactive sign-in — it stays available under its own switches.
    await api()
      .post('/api/v1/users/me/api-tokens')
      .set('Cookie', cookie)
      .send({ name: `switch-${suffix}`, scope: 'read' })
      .expect(201);
    await api()
      .post('/api/v1/users/me/feed-tokens')
      .set('Cookie', cookie)
      .send({ name: `switch-${suffix}` })
      .expect(201);

    await api().post('/api/v1/auth/logout').set('Cookie', cookie).expect(204);
    await api().get('/api/v1/auth/me').set('Cookie', cookie).expect(401);
  });

  it('fence: every auth route is either a marked local flow or on the reviewed allowlist', () => {
    // Routes that must stay reachable with local auth off — reviewed here.
    const allowlist = new Set([
      'registration', // signup-mode discovery; harmless metadata
      'methods', // the login screen's discovery endpoint
      'logout', // ending a session is not a credential flow
      'me', // session introspection
      'login', // OidcController: IdP redirect
      'link', // OidcController: explicit identity linking
      'callback', // OidcController: IdP return leg
    ]);
    for (const controller of [AuthController, OidcController]) {
      for (const name of Object.getOwnPropertyNames(controller.prototype)) {
        if (name === 'constructor') continue;
        const handler = controller.prototype[name as keyof typeof controller.prototype] as (
          ...args: unknown[]
        ) => unknown;
        const path = Reflect.getMetadata(PATH_METADATA, handler) as string | undefined;
        if (path === undefined) continue; // not a route
        const marked = Reflect.getMetadata(LOCAL_CREDENTIAL_KEY, handler) === true;
        expect(
          marked || allowlist.has(path),
          `${controller.name}.${name} (path "${path}") is neither @LocalCredentialFlow nor allowlisted`,
        ).toBe(true);
      }
    }
  });
});