import { Report } from '../../src/modules/reporting/domain/entities/Report';
import { ReportFormat } from '../../src/modules/reporting/domain/value-objects/ReportFormat';
import { ReportStatus } from '../../src/modules/reporting/domain/value-objects/ReportStatus';
import { GenerateReportCommand } from '../../src/modules/reporting/application/commands/GenerateReportCommand';
import { IReportRepository } from '../../src/modules/reporting/domain/ports/IReportRepository';
import { EventBus } from '../../src/shared/application/EventBus';
import { DomainEvent } from '../../src/shared/domain/DomainEvent';
import { EventHandler } from '../../src/shared/application/EventHandler';

// ─── Mock Repository ──────────────────────────────────────────────────────────

class InMemoryReportRepository implements IReportRepository {
  private store = new Map<string, Report>();

  async save(report: Report): Promise<void> {
    this.store.set(report.id.toString(), report);
  }

  async findById(id: string): Promise<Report | undefined> {
    return this.store.get(id);
  }

  async findAll(): Promise<Report[]> {
    return Array.from(this.store.values());
  }

  async update(report: Report): Promise<void> {
    this.store.set(report.id.toString(), report);
  }
}

// ─── Mock EventBus ────────────────────────────────────────────────────────────

class MockEventBus implements EventBus {
  published: DomainEvent[] = [];

  async publish(event: DomainEvent): Promise<void> {
    this.published.push(event);
  }

  subscribe(_name: string, _handler: EventHandler): void {
    // no-op
  }
}

// ─── Report domain tests ───────────────────────────────────────────────────────

describe('ReportFormat', () => {
  it('parses valid formats', () => {
    expect(ReportFormat.fromString('html').value).toBe('html');
    expect(ReportFormat.fromString('json').value).toBe('json');
    expect(ReportFormat.fromString('pdf').value).toBe('pdf');
  });

  it('throws on invalid format', () => {
    expect(() => ReportFormat.fromString('xml')).toThrow();
  });
});

describe('ReportStatus', () => {
  it('creates statuses', () => {
    expect(ReportStatus.pending().value).toBe('pending');
    expect(ReportStatus.generating().value).toBe('generating');
    expect(ReportStatus.ready().value).toBe('ready');
    expect(ReportStatus.failed().value).toBe('failed');
  });

  it('parses from string', () => {
    expect(ReportStatus.fromString('ready').value).toBe('ready');
  });

  it('throws on unknown status', () => {
    expect(() => ReportStatus.fromString('unknown')).toThrow();
  });
});

describe('Report aggregate', () => {
  it('creates a report with pending status and emits ReportRequested event', () => {
    const report = Report.create({
      title: 'Test Report',
      format: ReportFormat.fromString('html'),
      filters: { severity: 'high' },
    });

    expect(report.title).toBe('Test Report');
    expect(report.status.value).toBe('pending');
    expect(report.totalFindings).toBe(0);

    const events = report.clearEvents();
    expect(events).toHaveLength(1);
    expect(events[0]!.eventName).toBe('reporting.report_requested');
  });

  it('marks report as generating', () => {
    const report = Report.create({
      title: 'T',
      format: ReportFormat.fromString('json'),
      filters: {},
    });
    report.clearEvents();

    report.markGenerating();
    expect(report.status.value).toBe('generating');
  });

  it('marks report as ready and emits ReportGenerated', () => {
    const report = Report.create({
      title: 'T',
      format: ReportFormat.fromString('json'),
      filters: {},
    });
    report.clearEvents();

    report.markReady('/reports/123/report.json', 5);
    expect(report.status.value).toBe('ready');
    expect(report.filePath).toBe('/reports/123/report.json');
    expect(report.totalFindings).toBe(5);
    expect(report.completedAt).toBeInstanceOf(Date);

    const events = report.clearEvents();
    expect(events[0]!.eventName).toBe('reporting.report_generated');
  });

  it('marks report as failed and emits ReportFailed', () => {
    const report = Report.create({
      title: 'T',
      format: ReportFormat.fromString('pdf'),
      filters: {},
    });
    report.clearEvents();

    report.markFailed('Playwright error');
    expect(report.status.value).toBe('failed');
    expect(report.errorMessage).toBe('Playwright error');

    const events = report.clearEvents();
    expect(events[0]!.eventName).toBe('reporting.report_failed');
  });
});

// ─── GenerateReportCommand tests ───────────────────────────────────────────────

describe('GenerateReportCommand', () => {
  let repo: InMemoryReportRepository;
  let eventBus: MockEventBus;
  let cmd: GenerateReportCommand;

  beforeEach(() => {
    repo = new InMemoryReportRepository();
    eventBus = new MockEventBus();
    cmd = new GenerateReportCommand(repo, eventBus);
  });

  it('creates and persists a report, returns Ok with reportId', async () => {
    const result = await cmd.execute({ title: 'My Report', format: 'html' });

    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const { reportId, status } = result.value;
    expect(status).toBe('pending');

    const saved = await repo.findById(reportId);
    expect(saved).toBeDefined();
    expect(saved!.title).toBe('My Report');
    expect(saved!.format.value).toBe('html');
  });

  it('publishes ReportRequested event after creation', async () => {
    await cmd.execute({ title: 'Report', format: 'json' });

    expect(eventBus.published).toHaveLength(1);
    expect(eventBus.published[0]!.eventName).toBe('reporting.report_requested');
  });

  it('applies filters when provided', async () => {
    const result = await cmd.execute({
      title: 'Filtered',
      format: 'pdf',
      filters: { sessionId: 'abc-123', severity: 'critical' },
    });

    expect(result.ok).toBe(true);
    if (!result.ok) return;

    const saved = await repo.findById(result.value.reportId);
    expect(saved!.filters.sessionId).toBe('abc-123');
    expect(saved!.filters.severity).toBe('critical');
  });

  it('returns Err for invalid format', async () => {
    const result = await cmd.execute({ title: 'Bad', format: 'xml' as 'html' });

    expect(result.ok).toBe(false);
    if (result.ok) return;
    expect(result.error).toContain('Invalid format');
  });
});