jest.mock('uuid', () => ({ v4: jest.fn(() => 'mock-uuid') }));

jest.mock('@librechat/data-schemas', () => ({
  logger: { warn: jest.fn(), debug: jest.fn(), error: jest.fn() },
}));

jest.mock('@librechat/agents', () => ({
  EnvVar: { CODE_API_KEY: 'CODE_API_KEY' },
}));

jest.mock('@librechat/api', () => ({
  sanitizeFilename: jest.fn((n) => n),
  parseText: jest.fn().mockResolvedValue({ text: '', bytes: 0 }),
  processAudioFile: jest.fn(),
}));

jest.mock('librechat-data-provider', () => ({
  ...jest.requireActual('librechat-data-provider'),
  mergeFileConfig: jest.fn(),
}));

jest.mock('~/server/services/Files/images', () => ({
  convertImage: jest.fn(),
  resizeAndConvert: jest.fn(),
  resizeImageBuffer: jest.fn(),
}));

jest.mock('~/server/controllers/assistants/v2', () => ({
  addResourceFileId: jest.fn(),
  deleteResourceFileId: jest.fn(),
}));

jest.mock('~/models/Agent', () => ({
  addAgentResourceFile: jest.fn().mockResolvedValue({}),
  removeAgentResourceFiles: jest.fn(),
}));

jest.mock('~/server/controllers/assistants/helpers', () => ({
  getOpenAIClient: jest.fn(),
}));

jest.mock('~/server/services/Tools/credentials', () => ({
  loadAuthValues: jest.fn(),
}));

jest.mock('~/models', () => ({
  createFile: jest.fn().mockResolvedValue({ file_id: 'created-file-id' }),
  updateFileUsage: jest.fn(),
  deleteFiles: jest.fn(),
}));

jest.mock('~/server/utils/getFileStrategy', () => ({
  getFileStrategy: jest.fn().mockReturnValue('local'),
}));

jest.mock('~/server/services/Config', () => ({
  checkCapability: jest.fn().mockResolvedValue(true),
}));

jest.mock('~/server/utils/queue', () => ({
  LB_QueueAsyncCall: jest.fn(),
}));

jest.mock('~/server/services/Files/strategies', () => ({
  getStrategyFunctions: jest.fn(),
}));

jest.mock('~/server/utils', () => ({
  determineFileType: jest.fn(),
}));

jest.mock('~/server/services/Files/Audio/STTService', () => ({
  STTService: { getInstance: jest.fn() },
}));

const { EToolResources, FileSources, AgentCapabilities } = require('librechat-data-provider');
const { mergeFileConfig } = require('librechat-data-provider');
const { checkCapability } = require('~/server/services/Config');
const { getStrategyFunctions } = require('~/server/services/Files/strategies');
const { processAgentFileUpload } = require('./process');

const PDF_MIME = 'application/pdf';
const DOCX_MIME = 'application/vnd.openxmlformats-officedocument.wordprocessingml.document';
const XLSX_MIME = 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet';
const XLS_MIME = 'application/vnd.ms-excel';

const makeReq = ({ mimetype = PDF_MIME, ocrConfig = null } = {}) => ({
  user: { id: 'user-123' },
  file: {
    path: '/tmp/upload.bin',
    originalname: 'upload.bin',
    filename: 'upload-uuid.bin',
    mimetype,
  },
  body: { model: 'gpt-4o' },
  config: {
    fileConfig: {},
    fileStrategy: 'local',
    ocr: ocrConfig,
  },
});

const makeMetadata = () => ({
  agent_id: 'agent-abc',
  tool_resource: EToolResources.context,
  file_id: 'file-uuid-123',
});

const mockRes = {
  status: jest.fn().mockReturnThis(),
  json: jest.fn().mockReturnValue({}),
};

const makeFileConfig = ({ ocrSupportedMimeTypes = [] } = {}) => ({
  checkType: (mime, types) => (types ?? []).includes(mime),
  ocr: { supportedMimeTypes: ocrSupportedMimeTypes },
  stt: { supportedMimeTypes: [] },
  text: { supportedMimeTypes: [] },
});

describe('processAgentFileUpload', () => {
  beforeEach(() => {
    jest.clearAllMocks();
    mockRes.status.mockReturnThis();
    mockRes.json.mockReturnValue({});
    checkCapability.mockResolvedValue(true);
    getStrategyFunctions.mockReturnValue({
      handleFileUpload: jest
        .fn()
        .mockResolvedValue({ text: 'extracted text', bytes: 42, filepath: 'doc://result' }),
    });
    mergeFileConfig.mockReturnValue(makeFileConfig());
  });

  describe('OCR strategy selection', () => {
    test.each([
      ['PDF', PDF_MIME],
      ['DOCX', DOCX_MIME],
      ['XLSX', XLSX_MIME],
      ['XLS', XLS_MIME],
    ])('uses document_parser automatically for %s when no OCR is configured', async (_, mime) => {
      mergeFileConfig.mockReturnValue(makeFileConfig());
      const req = makeReq({ mimetype: mime, ocrConfig: null });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
    });

    test('does not check OCR capability when using automatic document_parser fallback', async () => {
      const req = makeReq({ mimetype: PDF_MIME, ocrConfig: null });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(checkCapability).not.toHaveBeenCalledWith(expect.anything(), AgentCapabilities.ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
    });

    test('uses the configured OCR strategy when OCR is set up for the file type', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      const req = makeReq({
        mimetype: PDF_MIME,
        ocrConfig: { strategy: FileSources.mistral_ocr },
      });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(checkCapability).toHaveBeenCalledWith(expect.anything(), AgentCapabilities.ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.mistral_ocr);
    });

    test('uses document_parser as default when OCR is configured but no strategy is specified', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      const req = makeReq({
        mimetype: PDF_MIME,
        ocrConfig: { supportedMimeTypes: [PDF_MIME] },
      });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(checkCapability).toHaveBeenCalledWith(expect.anything(), AgentCapabilities.ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
    });

    test('throws when configured OCR capability is not enabled for the agent', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      checkCapability.mockResolvedValue(false);
      const req = makeReq({
        mimetype: PDF_MIME,
        ocrConfig: { strategy: FileSources.mistral_ocr },
      });

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).rejects.toThrow('OCR capability is not enabled for Agents');
    });

    test('uses document_parser (no capability check) when OCR capability returns false but no OCR config', async () => {
      checkCapability.mockResolvedValue(false);
      const req = makeReq({ mimetype: PDF_MIME, ocrConfig: null });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(checkCapability).not.toHaveBeenCalledWith(expect.anything(), AgentCapabilities.ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
    });

    test('uses document_parser when OCR is configured but the file type is not in OCR supported types', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      const req = makeReq({
        mimetype: DOCX_MIME,
        ocrConfig: { strategy: FileSources.mistral_ocr },
      });

      await processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() });

      expect(checkCapability).not.toHaveBeenCalledWith(expect.anything(), AgentCapabilities.ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
      expect(getStrategyFunctions).not.toHaveBeenCalledWith(FileSources.mistral_ocr);
    });

    test('does not invoke any OCR strategy for unsupported MIME types without OCR config', async () => {
      const req = makeReq({ mimetype: 'text/plain', ocrConfig: null });

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).rejects.toThrow('File type text/plain is not supported for text parsing.');

      expect(getStrategyFunctions).not.toHaveBeenCalled();
    });

    test('throws instead of falling back to parseText when document_parser fails for a document MIME type', async () => {
      getStrategyFunctions.mockReturnValue({
        handleFileUpload: jest.fn().mockRejectedValue(new Error('No text found in document')),
      });
      const req = makeReq({ mimetype: PDF_MIME, ocrConfig: null });
      const { parseText } = require('@librechat/api');

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).rejects.toThrow(/image-based and requires an OCR service/);

      expect(parseText).not.toHaveBeenCalled();
    });

    test('falls back to document_parser when configured OCR fails for a document MIME type', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      const failingUpload = jest.fn().mockRejectedValue(new Error('OCR API returned 500'));
      const fallbackUpload = jest
        .fn()
        .mockResolvedValue({ text: 'parsed text', bytes: 11, filepath: 'doc://result' });
      getStrategyFunctions
        .mockReturnValueOnce({ handleFileUpload: failingUpload })
        .mockReturnValueOnce({ handleFileUpload: fallbackUpload });
      const req = makeReq({
        mimetype: PDF_MIME,
        ocrConfig: { strategy: FileSources.mistral_ocr },
      });

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).resolves.not.toThrow();

      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.mistral_ocr);
      expect(getStrategyFunctions).toHaveBeenCalledWith(FileSources.document_parser);
    });

    test('throws when both configured OCR and document_parser fallback fail', async () => {
      mergeFileConfig.mockReturnValue(makeFileConfig({ ocrSupportedMimeTypes: [PDF_MIME] }));
      getStrategyFunctions.mockReturnValue({
        handleFileUpload: jest.fn().mockRejectedValue(new Error('failure')),
      });
      const req = makeReq({
        mimetype: PDF_MIME,
        ocrConfig: { strategy: FileSources.mistral_ocr },
      });
      const { parseText } = require('@librechat/api');

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).rejects.toThrow(/image-based and requires an OCR service/);

      expect(parseText).not.toHaveBeenCalled();
    });
  });

  describe('text size guard', () => {
    test('throws before writing to MongoDB when extracted text exceeds 15MB', async () => {
      const oversizedText = 'x'.repeat(15 * 1024 * 1024 + 1);
      getStrategyFunctions.mockReturnValue({
        handleFileUpload: jest.fn().mockResolvedValue({
          text: oversizedText,
          bytes: Buffer.byteLength(oversizedText, 'utf8'),
          filepath: 'doc://result',
        }),
      });
      const req = makeReq({ mimetype: PDF_MIME, ocrConfig: null });
      const { createFile } = require('~/models');

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).rejects.toThrow(/exceeds the 15MB storage limit/);

      expect(createFile).not.toHaveBeenCalled();
    });

    test('succeeds when extracted text is within the 15MB limit', async () => {
      const okText = 'x'.repeat(1024);
      getStrategyFunctions.mockReturnValue({
        handleFileUpload: jest.fn().mockResolvedValue({
          text: okText,
          bytes: Buffer.byteLength(okText, 'utf8'),
          filepath: 'doc://result',
        }),
      });
      const req = makeReq({ mimetype: PDF_MIME, ocrConfig: null });

      await expect(
        processAgentFileUpload({ req, res: mockRes, metadata: makeMetadata() }),
      ).resolves.not.toThrow();
    });
  });
});