import { INestApplication } from '@nestjs/common';
import request from 'supertest';
import { buildTestApp } from './app.harness';

describe('ScenarioController', () => {
  let app: INestApplication;

  beforeAll(async () => {
    app = await buildTestApp();
  });

  afterAll(async () => {
    await app.close();
  });

  // ── helpers ────────────────────────────────────────────────────────────────

  async function createScenario(name = 'test scenario') {
    const res = await request(app.getHttpServer())
      .post('/scenarios')
      .send({ name })
      .expect(201);
    return res.body as { id: number; name: string };
  }

  async function createStep(scenarioId: number, overrides: Record<string, unknown> = {}) {
    const res = await request(app.getHttpServer())
      .post(`/scenarios/${scenarioId}/steps`)
      .send({
        order: 0,
        type: 'exec',
        sessionName: 'test-session',
        execCode: 'return 1;',
        ...overrides,
      })
      .expect(201);
    return res.body as { id: number };
  }

  // ── POST /scenarios ────────────────────────────────────────────────────────

  describe('POST /scenarios', () => {
    it('creates a scenario and returns 201', async () => {
      const res = await request(app.getHttpServer())
        .post('/scenarios')
        .send({ name: 'my scenario' })
        .expect(201);

      expect(res.body.id).toBeDefined();
      expect(res.body.name).toBe('my scenario');
    });

    it('returns 400 when name is missing', async () => {
      await request(app.getHttpServer()).post('/scenarios').send({}).expect(400);
    });
  });

  // ── GET /scenarios ─────────────────────────────────────────────────────────

  describe('GET /scenarios', () => {
    it('returns paginated result', async () => {
      const res = await request(app.getHttpServer()).get('/scenarios').expect(200);
      expect(res.body).toHaveProperty('data');
      expect(res.body).toHaveProperty('total');
      expect(res.body).toHaveProperty('page');
      expect(res.body).toHaveProperty('limit');
      expect(Array.isArray(res.body.data)).toBe(true);
    });

    it('respects page and limit params', async () => {
      const res = await request(app.getHttpServer())
        .get('/scenarios?page=1&limit=2')
        .expect(200);
      expect(res.body.limit).toBe(2);
      expect(res.body.page).toBe(1);
    });

    it('returns 400 for invalid pagination params', async () => {
      await request(app.getHttpServer()).get('/scenarios?page=0').expect(400);
    });
  });

  // ── GET /scenarios/:id ─────────────────────────────────────────────────────

  describe('GET /scenarios/:id', () => {
    it('returns the scenario with steps array', async () => {
      const sc = await createScenario('scenario-get-one');
      const res = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}`)
        .expect(200);
      expect(res.body.id).toBe(sc.id);
      expect(Array.isArray(res.body.steps)).toBe(true);
    });

    it('returns 404 for unknown id', async () => {
      await request(app.getHttpServer()).get('/scenarios/99999').expect(404);
    });
  });

  // ── PATCH /scenarios/:id ───────────────────────────────────────────────────

  describe('PATCH /scenarios/:id', () => {
    it('updates scenario name', async () => {
      const sc = await createScenario('patch-me');
      const res = await request(app.getHttpServer())
        .patch(`/scenarios/${sc.id}`)
        .send({ name: 'patched' })
        .expect(200);
      expect(res.body.name).toBe('patched');
    });

    it('returns 404 for unknown id', async () => {
      await request(app.getHttpServer())
        .patch('/scenarios/99999')
        .send({ name: 'x' })
        .expect(404);
    });
  });

  // ── DELETE /scenarios/:id ──────────────────────────────────────────────────

  describe('DELETE /scenarios/:id', () => {
    it('deletes and returns 204', async () => {
      const sc = await createScenario('delete-me');
      await request(app.getHttpServer()).delete(`/scenarios/${sc.id}`).expect(204);
      await request(app.getHttpServer()).get(`/scenarios/${sc.id}`).expect(404);
    });

    it('returns 404 for unknown id', async () => {
      await request(app.getHttpServer()).delete('/scenarios/99999').expect(404);
    });
  });

  // ── POST /scenarios/:id/steps ──────────────────────────────────────────────

  describe('POST /scenarios/:id/steps', () => {
    it('creates a step with required fields', async () => {
      const sc = await createScenario();
      const res = await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/steps`)
        .send({ order: 0, type: 'exec', sessionName: 'my-session', execCode: 'return 1;' })
        .expect(201);

      expect(res.body.id).toBeDefined();
      expect(res.body.order).toBe(0);
      expect(res.body.type).toBe('exec');
      expect(res.body.sessionName).toBe('my-session');
    });

    it('creates a login step', async () => {
      const sc = await createScenario();
      const res = await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/steps`)
        .send({ order: 0, type: 'login', sessionName: 'session-x' })
        .expect(201);

      expect(res.body.type).toBe('login');
    });

    it('returns 400 when order is missing', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/steps`)
        .send({ type: 'exec', sessionName: 'x' })
        .expect(400);
    });

    it('returns 400 when type is invalid', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/steps`)
        .send({ order: 0, type: 'unknown', sessionName: 'x' })
        .expect(400);
    });

    it('returns 400 when sessionName is missing', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/steps`)
        .send({ order: 0, type: 'exec' })
        .expect(400);
    });

    it('returns 404 for unknown scenario', async () => {
      await request(app.getHttpServer())
        .post('/scenarios/99999/steps')
        .send({ order: 0, type: 'exec', sessionName: 'x' })
        .expect(404);
    });

    it('returns steps ordered by order field', async () => {
      const sc = await createScenario();
      await createStep(sc.id, { order: 2, type: 'exec', sessionName: 's' });
      await createStep(sc.id, { order: 0, type: 'exec', sessionName: 's' });
      await createStep(sc.id, { order: 1, type: 'exec', sessionName: 's' });

      const res = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}`)
        .expect(200);

      const orders = res.body.steps.map((s: any) => s.order);
      expect(orders).toEqual([0, 1, 2]);
    });
  });

  // ── GET /scenarios/:id/steps/:stepId ──────────────────────────────────────

  describe('GET /scenarios/:id/steps/:stepId', () => {
    it('returns the step', async () => {
      const sc = await createScenario();
      const step = await createStep(sc.id);

      const res = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/steps/${step.id}`)
        .expect(200);

      expect(res.body.id).toBe(step.id);
    });

    it('returns 404 for unknown step', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/steps/99999`)
        .expect(404);
    });
  });

  // ── PATCH /scenarios/:id/steps/:stepId ────────────────────────────────────

  describe('PATCH /scenarios/:id/steps/:stepId', () => {
    it('updates step fields', async () => {
      const sc = await createScenario();
      const step = await createStep(sc.id, { order: 0, execCode: 'return 1;' });

      const res = await request(app.getHttpServer())
        .patch(`/scenarios/${sc.id}/steps/${step.id}`)
        .send({ order: 5, execCode: 'return 99;' })
        .expect(200);

      expect(res.body.order).toBe(5);
      expect(res.body.execCode).toBe('return 99;');
    });

    it('returns 404 for unknown step', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .patch(`/scenarios/${sc.id}/steps/99999`)
        .send({ order: 1 })
        .expect(404);
    });
  });

  // ── DELETE /scenarios/:id/steps/:stepId ───────────────────────────────────

  describe('DELETE /scenarios/:id/steps/:stepId', () => {
    it('deletes the step and returns 204', async () => {
      const sc = await createScenario();
      const step = await createStep(sc.id);

      await request(app.getHttpServer())
        .delete(`/scenarios/${sc.id}/steps/${step.id}`)
        .expect(204);

      await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/steps/${step.id}`)
        .expect(404);
    });
  });

  // ── POST /scenarios/:id/run ────────────────────────────────────────────────

  describe('POST /scenarios/:id/run', () => {
    it('creates a run with stepRuns in correct initial states', async () => {
      const sc = await createScenario();
      await createStep(sc.id, { order: 0 });
      await createStep(sc.id, { order: 1 });
      await createStep(sc.id, { order: 2 });

      const res = await request(app.getHttpServer())
        .post(`/scenarios/${sc.id}/run`)
        .expect(201);

      expect(res.body.status).toBe('pending');
      expect(Array.isArray(res.body.stepRuns)).toBe(true);
      expect(res.body.stepRuns).toHaveLength(3);

      const statuses = res.body.stepRuns.map((s: any) => s.status);
      expect(statuses[0]).toBe('pending');
      expect(statuses[1]).toBe('waiting');
      expect(statuses[2]).toBe('waiting');
    });

    it('returns 404 for unknown scenario', async () => {
      await request(app.getHttpServer())
        .post('/scenarios/99999/run')
        .expect(404);
    });
  });

  // ── GET /scenarios/:id/runs ────────────────────────────────────────────────

  describe('GET /scenarios/:id/runs', () => {
    it('returns paginated runs with stepRuns embedded', async () => {
      const sc = await createScenario();
      await createStep(sc.id, { order: 0 });
      await request(app.getHttpServer()).post(`/scenarios/${sc.id}/run`).expect(201);

      const res = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/runs`)
        .expect(200);

      expect(res.body.total).toBeGreaterThanOrEqual(1);
      expect(Array.isArray(res.body.data[0].stepRuns)).toBe(true);
    });

    it('filters by status', async () => {
      const sc = await createScenario();
      await createStep(sc.id, { order: 0 });
      await request(app.getHttpServer()).post(`/scenarios/${sc.id}/run`).expect(201);

      const pendingRes = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/runs?status=pending`)
        .expect(200);

      expect(pendingRes.body.total).toBeGreaterThanOrEqual(1);
      pendingRes.body.data.forEach((r: any) => expect(r.status).toBe('pending'));

      const passRes = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/runs?status=pass`)
        .expect(200);

      expect(passRes.body.total).toBe(0);
    });

    it('returns 400 for invalid status filter', async () => {
      const sc = await createScenario();
      await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/runs?status=invalid`)
        .expect(400);
    });

    it('returns 404 for unknown scenario', async () => {
      await request(app.getHttpServer()).get('/scenarios/99999/runs').expect(404);
    });
  });
});