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 () => {
      await createScenario('paged-sc-a');
      await createScenario('paged-sc-b');

      const res = await request(app.getHttpServer())
        .get('/scenarios?page=1&limit=1')
        .expect(200);
      expect(res.body.data).toHaveLength(1);
      expect(res.body.limit).toBe(1);
      expect(res.body.page).toBe(1);
    });

    it('returns empty data for out-of-range page', async () => {
      const res = await request(app.getHttpServer()).get('/scenarios?page=9999&limit=20').expect(200);
      expect(res.body.data).toHaveLength(0);
    });

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

    it('orders by name ASC', async () => {
      await createScenario('zzz-order-sc');
      await createScenario('aaa-order-sc');

      const res = await request(app.getHttpServer()).get('/scenarios?orderBy=name&orderDir=ASC').expect(200);
      const names: string[] = res.body.data.map((s: any) => s.name);
      expect(names).toEqual([...names].sort());
    });

    it('orders by name DESC', async () => {
      const res = await request(app.getHttpServer()).get('/scenarios?orderBy=name&orderDir=DESC').expect(200);
      const names: string[] = res.body.data.map((s: any) => s.name);
      expect(names).toEqual([...names].sort().reverse());
    });

    it('returns 400 for invalid orderDir', async () => {
      await request(app.getHttpServer()).get('/scenarios?orderDir=SIDEWAYS').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);
    });
  });

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

  describe('GET /scenarios/:id/export', () => {
    it('returns name and steps array', async () => {
      const sc = await createScenario('export-me');
      await createStep(sc.id, { order: 0, type: 'login', sessionName: 's', execCode: '{"keyId":"k","environmentName":"e"}' });
      await createStep(sc.id, { order: 1, type: 'exec',  sessionName: 's', execCode: 'return 1;', validateCode: 'return true;' });

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

      expect(res.body.name).toBe('export-me');
      expect(Array.isArray(res.body.steps)).toBe(true);
      expect(res.body.steps).toHaveLength(2);
    });

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

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

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

    it('omits internal fields (id, scenarioId, timestamps)', async () => {
      const sc = await createScenario('export-shape');
      await createStep(sc.id, { order: 0, sessionName: 's' });

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

      const step = res.body.steps[0];
      expect(step).not.toHaveProperty('id');
      expect(step).not.toHaveProperty('scenarioId');
      expect(step).not.toHaveProperty('createdAt');
      expect(step).not.toHaveProperty('updatedAt');
    });

    it('exports null validateCode as null', async () => {
      const sc = await createScenario('export-null-validate');
      await createStep(sc.id, { order: 0, sessionName: 's', execCode: 'return 1;' });

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

      expect(res.body.steps[0].validateCode).toBeNull();
    });

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

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

  describe('POST /scenarios/import', () => {
    it('creates a new scenario with all steps', async () => {
      const payload = {
        name: 'imported scenario',
        steps: [
          { order: 0, type: 'login', sessionName: 's', execCode: '{"keyId":"k","environmentName":"e"}', validateCode: null },
          { order: 1, type: 'exec',  sessionName: 's', execCode: 'return 1;', validateCode: 'return true;' },
          { order: 2, type: 'sign',  sessionName: 's', execCode: '{"keyId":"k"}', validateCode: null },
        ],
      };

      const res = await request(app.getHttpServer())
        .post('/scenarios/import')
        .send(payload)
        .expect(201);

      expect(res.body.id).toBeDefined();
      expect(res.body.name).toBe('imported scenario');
      expect(res.body.steps).toHaveLength(3);
      expect(res.body.steps[0].type).toBe('login');
      expect(res.body.steps[1].type).toBe('exec');
      expect(res.body.steps[2].type).toBe('sign');
    });

    it('assigns a new id (does not collide with source)', async () => {
      const sc = await createScenario('original');
      const exportRes = await request(app.getHttpServer())
        .get(`/scenarios/${sc.id}/export`)
        .expect(200);

      const importRes = await request(app.getHttpServer())
        .post('/scenarios/import')
        .send(exportRes.body)
        .expect(201);

      expect(importRes.body.id).not.toBe(sc.id);
    });

    it('round-trips a scenario faithfully', async () => {
      const sc = await createScenario('roundtrip');
      await createStep(sc.id, { order: 0, type: 'exec', sessionName: 'rs', execCode: 'return 42;', validateCode: 'return true;' });

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

      const importRes = await request(app.getHttpServer())
        .post('/scenarios/import')
        .send(exportRes.body)
        .expect(201);

      expect(importRes.body.name).toBe('roundtrip');
      expect(importRes.body.steps).toHaveLength(1);
      expect(importRes.body.steps[0].execCode).toBe(exportRes.body.steps[0].execCode);
      expect(importRes.body.steps[0].validateCode).toBe(exportRes.body.steps[0].validateCode);
    });

    it('imports with empty steps array', async () => {
      const res = await request(app.getHttpServer())
        .post('/scenarios/import')
        .send({ name: 'empty-import', steps: [] })
        .expect(201);

      expect(res.body.name).toBe('empty-import');
      expect(res.body.steps).toHaveLength(0);
    });

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

    it('returns 400 when steps is not an array', async () => {
      await request(app.getHttpServer())
        .post('/scenarios/import')
        .send({ name: 'bad', steps: 'oops' })
        .expect(400);
    });

    it('returns 400 when a step has an invalid type', async () => {
      await request(app.getHttpServer())
        .post('/scenarios/import')
        .send({ name: 'bad-type', steps: [{ order: 0, type: 'unknown', sessionName: 's' }] })
        .expect(400);
    });
  });
});