/**
 * @ai-summary Unit tests for OCR manual extraction endpoint
 */

import { OcrService } from '../../domain/ocr.service';
import { ocrClient, JobNotFoundError } from '../../external/ocr-client';
import type { ManualJobResponse } from '../../domain/ocr.types';

jest.mock('../../external/ocr-client');
jest.mock('../../../../core/logging/logger');

const mockSubmitManualJob = ocrClient.submitManualJob as jest.MockedFunction<
  typeof ocrClient.submitManualJob
>;
const mockGetJobStatus = ocrClient.getJobStatus as jest.MockedFunction<
  typeof ocrClient.getJobStatus
>;

describe('OcrService.submitManualJob', () => {
  let service: OcrService;

  const userId = 'test-user-id';

  const mockManualJobResponse: ManualJobResponse = {
    jobId: 'manual-job-123',
    status: 'pending',
    progress: 0,
    estimatedSeconds: 45,
    result: undefined,
    error: undefined,
  };

  const mockCompletedJobResponse: ManualJobResponse = {
    jobId: 'manual-job-123',
    status: 'completed',
    progress: 100,
    result: {
      success: true,
      vehicleInfo: {
        make: 'Honda',
        model: 'Civic',
        year: 2023,
      },
      maintenanceSchedules: [
        {
          service: 'Engine Oil Change',
          intervalMiles: 5000,
          intervalMonths: 6,
          details: 'Use 0W-20 full synthetic oil',
          confidence: 0.95,
          subtypes: ['oil_change'],
        },
        {
          service: 'Tire Rotation',
          intervalMiles: 7500,
          intervalMonths: 6,
          details: null,
          confidence: 0.90,
          subtypes: ['tire_rotation'],
        },
      ],
      rawTables: [],
      processingTimeMs: 45000,
      totalPages: 120,
      pagesProcessed: 120,
      error: null,
    },
    error: undefined,
  };

  beforeEach(() => {
    jest.clearAllMocks();
    service = new OcrService();
  });

  describe('valid manual job submission', () => {
    it('should return 202-style response with jobId for PDF submission', async () => {
      mockSubmitManualJob.mockResolvedValue(mockManualJobResponse);

      const result = await service.submitManualJob(userId, {
        fileBuffer: Buffer.from('fake-pdf-data'),
        contentType: 'application/pdf',
      });

      expect(result.jobId).toBe('manual-job-123');
      expect(result.status).toBe('pending');
      expect(result.progress).toBe(0);
      expect(result.estimatedSeconds).toBe(45);
      expect(result.result).toBeUndefined();
    });

    it('should pass vehicleId to client when provided', async () => {
      mockSubmitManualJob.mockResolvedValue(mockManualJobResponse);

      await service.submitManualJob(userId, {
        fileBuffer: Buffer.from('fake-pdf-data'),
        contentType: 'application/pdf',
        vehicleId: 'vehicle-abc',
      });

      expect(mockSubmitManualJob).toHaveBeenCalledWith(
        expect.any(Buffer),
        'application/pdf',
        'vehicle-abc'
      );
    });

    it('should call client without vehicleId when not provided', async () => {
      mockSubmitManualJob.mockResolvedValue(mockManualJobResponse);

      await service.submitManualJob(userId, {
        fileBuffer: Buffer.from('fake-pdf-data'),
        contentType: 'application/pdf',
      });

      expect(mockSubmitManualJob).toHaveBeenCalledWith(
        expect.any(Buffer),
        'application/pdf',
        undefined
      );
    });
  });

  describe('completed job result', () => {
    it('should return completed result with maintenanceSchedules', async () => {
      mockSubmitManualJob.mockResolvedValue(mockCompletedJobResponse);

      const result = await service.submitManualJob(userId, {
        fileBuffer: Buffer.from('fake-pdf-data'),
        contentType: 'application/pdf',
      });

      expect(result.status).toBe('completed');
      expect(result.result).toBeDefined();
      expect(result.result!.success).toBe(true);
      expect(result.result!.maintenanceSchedules).toHaveLength(2);
      expect(result.result!.maintenanceSchedules[0].service).toBe('Engine Oil Change');
      expect(result.result!.maintenanceSchedules[0].intervalMiles).toBe(5000);
      expect(result.result!.maintenanceSchedules[0].subtypes).toEqual(['oil_change']);
      expect(result.result!.vehicleInfo.make).toBe('Honda');
    });
  });

  describe('error handling', () => {
    it('should throw 400 for non-PDF file (JPEG)', async () => {
      await expect(
        service.submitManualJob(userId, {
          fileBuffer: Buffer.from('fake-image-data'),
          contentType: 'image/jpeg',
        })
      ).rejects.toMatchObject({
        statusCode: 400,
      });
    });

    it('should throw 400 for non-PDF file (PNG)', async () => {
      await expect(
        service.submitManualJob(userId, {
          fileBuffer: Buffer.from('fake-image-data'),
          contentType: 'image/png',
        })
      ).rejects.toMatchObject({
        statusCode: 400,
      });
    });

    it('should throw 400 for text/plain', async () => {
      await expect(
        service.submitManualJob(userId, {
          fileBuffer: Buffer.from('not a pdf'),
          contentType: 'text/plain',
        })
      ).rejects.toMatchObject({
        statusCode: 400,
      });
    });

    it('should throw 413 for oversized file', async () => {
      const largeBuffer = Buffer.alloc(201 * 1024 * 1024); // 201MB

      await expect(
        service.submitManualJob(userId, {
          fileBuffer: largeBuffer,
          contentType: 'application/pdf',
        })
      ).rejects.toMatchObject({
        statusCode: 413,
      });
    });

    it('should accept file at 200MB boundary', async () => {
      mockSubmitManualJob.mockResolvedValue(mockManualJobResponse);
      const exactBuffer = Buffer.alloc(200 * 1024 * 1024); // exactly 200MB

      const result = await service.submitManualJob(userId, {
        fileBuffer: exactBuffer,
        contentType: 'application/pdf',
      });

      expect(result.jobId).toBe('manual-job-123');
    });

    it('should propagate OCR service errors', async () => {
      mockSubmitManualJob.mockRejectedValue(
        new Error('OCR service error: 500 - Internal error')
      );

      await expect(
        service.submitManualJob(userId, {
          fileBuffer: Buffer.from('fake-pdf-data'),
          contentType: 'application/pdf',
        })
      ).rejects.toThrow('OCR service error: 500 - Internal error');
    });
  });
});

describe('OcrService.getJobStatus (manual job polling)', () => {
  let service: OcrService;
  const userId = 'test-user-id';

  beforeEach(() => {
    jest.clearAllMocks();
    service = new OcrService();
  });

  it('should return completed manual job with schedules', async () => {
    mockGetJobStatus.mockResolvedValue({
      jobId: 'manual-job-123',
      status: 'completed',
      progress: 100,
    });

    const result = await service.getJobStatus(userId, 'manual-job-123');

    expect(result.jobId).toBe('manual-job-123');
    expect(result.status).toBe('completed');
    expect(result.progress).toBe(100);
  });

  it('should return processing status with progress', async () => {
    mockGetJobStatus.mockResolvedValue({
      jobId: 'manual-job-456',
      status: 'processing',
      progress: 50,
    });

    const result = await service.getJobStatus(userId, 'manual-job-456');

    expect(result.status).toBe('processing');
    expect(result.progress).toBe(50);
  });

  it('should throw 410 Gone for expired/missing job', async () => {
    mockGetJobStatus.mockRejectedValue(new JobNotFoundError('expired-job-789'));

    await expect(
      service.getJobStatus(userId, 'expired-job-789')
    ).rejects.toMatchObject({
      statusCode: 410,
      message: 'Job expired (max 2 hours). Please resubmit.',
    });
  });
});

describe('Manual extraction controller validations', () => {
  it('PDF magic bytes validation rejects non-PDF content', () => {
    // Controller validates first 4 bytes match %PDF (0x25504446)
    // Files without %PDF header receive 415 Unsupported Media Type
    const pdfMagic = Buffer.from('%PDF');
    const notPdf = Buffer.from('JFIF');

    expect(pdfMagic.subarray(0, 4).equals(Buffer.from('%PDF'))).toBe(true);
    expect(notPdf.subarray(0, 4).equals(Buffer.from('%PDF'))).toBe(false);
  });

  it('accepts files with .pdf extension even if mimetype is octet-stream', () => {
    // Controller checks: contentType === 'application/pdf' OR filename.endsWith('.pdf')
    // This allows uploads where browser sends generic content type
    const filename = 'owners-manual.pdf';
    expect(filename.toLowerCase().endsWith('.pdf')).toBe(true);
  });
});

describe('Manual route tier guard', () => {
  it('route is configured with tier guard for document.scanMaintenanceSchedule', async () => {
    // Tier guard is enforced at route level via requireTier('document.scanMaintenanceSchedule')
    // preHandler: [requireAuth, requireTier('document.scanMaintenanceSchedule')]
    // Free-tier users receive 403 TIER_REQUIRED before the handler executes.
    // Middleware behavior is tested in core/middleware/require-tier.test.ts
    const { requireTier } = await import('../../../../core/middleware/require-tier');
    const handler = requireTier('document.scanMaintenanceSchedule');
    expect(typeof handler).toBe('function');
  });
});