/**
 * TST-005: Goals API Integration Tests (CC-047)
 *
 * Tests HTTP contract of GoalsController:
 *   - routing and response shapes
 *   - ValidationPipe enforcement (missing fields, extra fields, invalid enums)
 *   - ParseUUIDPipe on path params
 *   - BadRequestException for invalid status filter
 *
 * GoalsService is mocked — no real DB needed.
 * UUIDs are v4-compliant (version nibble=4, variant nibble=8) so @IsUUID() passes.
 */
import request from 'supertest';
import {
  CanActivate,
  ExecutionContext,
  Injectable,
  UnauthorizedException,
  INestApplication,
  ValidationPipe,
  Module,
} from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { Test, type TestingModule } from '@nestjs/testing';
import helmet from 'helmet';
import { ConfigModule } from '@nestjs/config';
import { APP_GUARD } from '@nestjs/core';
import { GoalsController } from '../goals/goals.controller';
import { GoalsService } from '../goals/goals.service';

// ── Stub auth guard ────────────────────────────────────────────────────────

const FAKE_SESSION = {
  requestId: 'req-1',
  correlationId: 'cor-1',
  sessionId: 'ses-1',
  userId: '1a000000-0000-4000-8000-000000000001',
  tenantId: '1a000000-0000-4000-8000-000000000002',
  workspaceId: '1a000000-0000-4000-8000-000000000003',
  membershipId: '1a000000-0000-4000-8000-000000000004',
  role: 'owner' as const,
  roles: ['owner' as const],
  permissions: ['*'],
  purpose: 'test',
  timezone: 'UTC',
  source: 'api' as const,
};

@Injectable()
class StubAuthGuard implements CanActivate {
  constructor(private readonly reflector: Reflector) {}
  canActivate(context: ExecutionContext): boolean {
    const req = context.switchToHttp().getRequest<{ headers: Record<string, string>; session?: typeof FAKE_SESSION }>();
    const auth = req.headers['authorization'] ?? '';
    if (!auth.startsWith('Bearer ') || !auth.slice(7).trim()) {
      throw new UnauthorizedException('Missing bearer token');
    }
    req.session = FAKE_SESSION;
    return true;
  }
}

// ── Mock service ───────────────────────────────────────────────────────────

const MOCK_GOAL = {
  id: '1a000000-0000-4000-8000-aaaa00000001',
  tenantId: '1a000000-0000-4000-8000-000000000002',
  ownerUserId: '1a000000-0000-4000-8000-000000000001',
  horizon: 'Q4 2026',
  metric: 'MRR',
  target: '100k',
  status: 'not_started',
  milestones: [],
  createdAt: new Date('2026-07-31'),
  updatedAt: new Date('2026-07-31'),
  deletedAt: null,
  version: 1,
};

const mockGoalsService = {
  list: jest.fn().mockResolvedValue([MOCK_GOAL]),
  getById: jest.fn().mockResolvedValue(MOCK_GOAL),
  create: jest.fn().mockResolvedValue(MOCK_GOAL),
  update: jest.fn().mockResolvedValue({ ...MOCK_GOAL, status: 'on_track' }),
  softDelete: jest.fn().mockResolvedValue({ deleted: true }),
};

@Module({
  imports: [ConfigModule.forRoot({ isGlobal: true })],
  controllers: [GoalsController],
  providers: [
    { provide: GoalsService, useValue: mockGoalsService },
    { provide: APP_GUARD, useClass: StubAuthGuard },
  ],
})
class GoalsTestModule {}

// ── Suite ──────────────────────────────────────────────────────────────────

const AUTH = 'Bearer test-token';

describe('TST-005: Goals API Integration', () => {
  let app: INestApplication;

  beforeAll(async () => {
    const module: TestingModule = await Test.createTestingModule({
      imports: [GoalsTestModule],
    }).compile();

    app = module.createNestApplication();
    app.use(helmet());
    app.useGlobalPipes(
      new ValidationPipe({ whitelist: true, forbidNonWhitelisted: true, transform: true }),
    );
    app.setGlobalPrefix('v1');
    await app.init();
  });

  afterAll(() => app.close());
  beforeEach(() => jest.clearAllMocks());

  // ── GET /v1/goals ────────────────────────────────────────────────────────

  describe('GET /v1/goals', () => {
    it('returns 401 without auth', async () => {
      await request(app.getHttpServer()).get('/v1/goals').expect(401);
    });

    it('returns 200 with array when authenticated', async () => {
      const res = await request(app.getHttpServer())
        .get('/v1/goals')
        .set('Authorization', AUTH)
        .expect(200);
      expect(Array.isArray(res.body)).toBe(true);
      expect(mockGoalsService.list).toHaveBeenCalledTimes(1);
    });

    it('passes status filter to service', async () => {
      await request(app.getHttpServer())
        .get('/v1/goals?status=on_track')
        .set('Authorization', AUTH)
        .expect(200);
      expect(mockGoalsService.list).toHaveBeenCalledWith(
        expect.objectContaining({ userId: '1a000000-0000-4000-8000-000000000001' }),
        'on_track',
      );
    });

    it('returns 400 for invalid status value', async () => {
      await request(app.getHttpServer())
        .get('/v1/goals?status=invalid_status')
        .set('Authorization', AUTH)
        .expect(400);
    });
  });

  // ── POST /v1/goals ────────────────────────────────────────────────────────

  describe('POST /v1/goals', () => {
    it('returns 201 with valid body', async () => {
      const res = await request(app.getHttpServer())
        .post('/v1/goals')
        .set('Authorization', AUTH)
        .send({ horizon: 'Q4 2026', metric: 'MRR', target: '100k' })
        .expect(201);
      expect(res.body).toMatchObject({ horizon: 'Q4 2026' });
      expect(mockGoalsService.create).toHaveBeenCalledTimes(1);
    });

    it('returns 400 when required field missing (metric)', async () => {
      await request(app.getHttpServer())
        .post('/v1/goals')
        .set('Authorization', AUTH)
        .send({ horizon: 'Q4 2026', target: '100k' })
        .expect(400);
    });

    it('returns 400 for extra non-whitelisted field', async () => {
      await request(app.getHttpServer())
        .post('/v1/goals')
        .set('Authorization', AUTH)
        .send({ horizon: 'Q4 2026', metric: 'MRR', target: '100k', hackField: 'injection' })
        .expect(400);
    });

    it('returns 400 when horizon is empty string', async () => {
      await request(app.getHttpServer())
        .post('/v1/goals')
        .set('Authorization', AUTH)
        .send({ horizon: '', metric: 'MRR', target: '100k' })
        .expect(400);
    });
  });

  // ── PATCH /v1/goals/:id ───────────────────────────────────────────────────

  describe('PATCH /v1/goals/:id', () => {
    it('returns 200 with valid UUID and valid body', async () => {
      await request(app.getHttpServer())
        .patch('/v1/goals/1a000000-0000-4000-8000-aaaa00000001')
        .set('Authorization', AUTH)
        .send({ status: 'on_track' })
        .expect(200);
    });

    it('returns 400 for non-UUID path param', async () => {
      await request(app.getHttpServer())
        .patch('/v1/goals/not-a-uuid')
        .set('Authorization', AUTH)
        .send({ status: 'on_track' })
        .expect(400);
    });

    it('returns 400 for invalid status value in body', async () => {
      await request(app.getHttpServer())
        .patch('/v1/goals/1a000000-0000-4000-8000-aaaa00000001')
        .set('Authorization', AUTH)
        .send({ status: 'flying' })
        .expect(400);
    });
  });

  // ── DELETE /v1/goals/:id ──────────────────────────────────────────────────

  describe('DELETE /v1/goals/:id', () => {
    it('returns 200 with valid UUID', async () => {
      await request(app.getHttpServer())
        .delete('/v1/goals/1a000000-0000-4000-8000-aaaa00000001')
        .set('Authorization', AUTH)
        .expect(200);
      expect(mockGoalsService.softDelete).toHaveBeenCalledTimes(1);
    });

    it('returns 400 for non-UUID path param', async () => {
      await request(app.getHttpServer())
        .delete('/v1/goals/not-a-uuid')
        .set('Authorization', AUTH)
        .expect(400);
    });
  });
});