const { Providers } = require('@librechat/agents');
const { Constants, EModelEndpoint } = require('librechat-data-provider');
const AgentClient = require('./client');

jest.mock('@librechat/agents', () => ({
  ...jest.requireActual('@librechat/agents'),
  createMetadataAggregator: () => ({
    handleLLMEnd: jest.fn(),
    collected: [],
  }),
}));

describe('AgentClient - titleConvo', () => {
  let client;
  let mockRun;
  let mockReq;
  let mockRes;
  let mockAgent;
  let mockOptions;

  beforeEach(() => {
    // Reset all mocks
    jest.clearAllMocks();

    // Mock run object
    mockRun = {
      generateTitle: jest.fn().mockResolvedValue({
        title: 'Generated Title',
      }),
    };

    // Mock agent - with both endpoint and provider
    mockAgent = {
      id: 'agent-123',
      endpoint: EModelEndpoint.openAI, // Use a valid provider as endpoint for getProviderConfig
      provider: EModelEndpoint.openAI, // Add provider property
      model_parameters: {
        model: 'gpt-4',
      },
    };

    // Mock request and response
    mockReq = {
      user: {
        id: 'user-123',
      },
      body: {
        model: 'gpt-4',
        endpoint: EModelEndpoint.openAI,
        key: null,
      },
      config: {
        endpoints: {
          [EModelEndpoint.openAI]: {
            // Match the agent endpoint
            titleModel: 'gpt-3.5-turbo',
            titlePrompt: 'Custom title prompt',
            titleMethod: 'structured',
            titlePromptTemplate: 'Template: {{content}}',
          },
        },
      },
    };

    mockRes = {};

    // Mock options
    mockOptions = {
      req: mockReq,
      res: mockRes,
      agent: mockAgent,
      endpointTokenConfig: {},
    };

    // Create client instance
    client = new AgentClient(mockOptions);
    client.run = mockRun;
    client.responseMessageId = 'response-123';
    client.conversationId = 'convo-123';
    client.contentParts = [{ type: 'text', text: 'Test content' }];
    client.recordCollectedUsage = jest.fn().mockResolvedValue(); // Mock as async function that resolves
  });

  describe('titleConvo method', () => {
    it('should throw error if run is not initialized', async () => {
      client.run = null;

      await expect(
        client.titleConvo({ text: 'Test', abortController: new AbortController() }),
      ).rejects.toThrow('Run not initialized');
    });

    it('should use titlePrompt from endpoint config', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titlePrompt: 'Custom title prompt',
        }),
      );
    });

    it('should use titlePromptTemplate from endpoint config', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titlePromptTemplate: 'Template: {{content}}',
        }),
      );
    });

    it('should use titleMethod from endpoint config', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          provider: Providers.OPENAI,
          titleMethod: 'structured',
        }),
      );
    });

    it('should use titleModel from endpoint config when provided', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      // Check that generateTitle was called with correct clientOptions
      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('gpt-3.5-turbo');
    });

    it('should handle missing endpoint config gracefully', async () => {
      // Remove endpoint config
      mockReq.config = { endpoints: {} };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titlePrompt: undefined,
          titlePromptTemplate: undefined,
          titleMethod: undefined,
        }),
      );
    });

    it('should use agent model when titleModel is not provided', async () => {
      // Remove titleModel from config
      mockReq.config = {
        endpoints: {
          [EModelEndpoint.openAI]: {
            titlePrompt: 'Custom title prompt',
            titleMethod: 'structured',
            titlePromptTemplate: 'Template: {{content}}',
            // titleModel is omitted
          },
        },
      };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('gpt-4'); // Should use agent's model
    });

    it('should not use titleModel when it equals CURRENT_MODEL constant', async () => {
      mockReq.config = {
        endpoints: {
          [EModelEndpoint.openAI]: {
            titleModel: Constants.CURRENT_MODEL,
            titlePrompt: 'Custom title prompt',
            titleMethod: 'structured',
            titlePromptTemplate: 'Template: {{content}}',
          },
        },
      };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('gpt-4'); // Should use agent's model
    });

    it('should pass all required parameters to generateTitle', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(mockRun.generateTitle).toHaveBeenCalledWith({
        provider: expect.any(String),
        inputText: text,
        contentParts: client.contentParts,
        clientOptions: expect.objectContaining({
          model: 'gpt-3.5-turbo',
        }),
        titlePrompt: 'Custom title prompt',
        titlePromptTemplate: 'Template: {{content}}',
        titleMethod: 'structured',
        chainOptions: expect.objectContaining({
          signal: abortController.signal,
        }),
      });
    });

    it('should record collected usage after title generation', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      expect(client.recordCollectedUsage).toHaveBeenCalledWith({
        model: 'gpt-3.5-turbo',
        context: 'title',
        collectedUsage: expect.any(Array),
        balance: {
          enabled: false,
        },
        transactions: {
          enabled: true,
        },
      });
    });

    it('should return the generated title', async () => {
      const text = 'Test conversation text';
      const abortController = new AbortController();

      const result = await client.titleConvo({ text, abortController });

      expect(result).toBe('Generated Title');
    });

    it('should handle errors gracefully and return undefined', async () => {
      mockRun.generateTitle.mockRejectedValue(new Error('Title generation failed'));

      const text = 'Test conversation text';
      const abortController = new AbortController();

      const result = await client.titleConvo({ text, abortController });

      expect(result).toBeUndefined();
    });

    it('should pass titleEndpoint configuration to generateTitle', async () => {
      // Mock the API key just for this test
      const originalApiKey = process.env.ANTHROPIC_API_KEY;
      process.env.ANTHROPIC_API_KEY = 'test-api-key';

      // Add titleEndpoint to the config
      mockReq.config = {
        endpoints: {
          [EModelEndpoint.openAI]: {
            titleModel: 'gpt-3.5-turbo',
            titleEndpoint: EModelEndpoint.anthropic,
            titleMethod: 'structured',
            titlePrompt: 'Custom title prompt',
            titlePromptTemplate: 'Custom template',
          },
        },
      };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      // Verify generateTitle was called with the custom configuration
      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titleMethod: 'structured',
          provider: Providers.ANTHROPIC,
          titlePrompt: 'Custom title prompt',
          titlePromptTemplate: 'Custom template',
        }),
      );

      // Restore the original API key
      if (originalApiKey) {
        process.env.ANTHROPIC_API_KEY = originalApiKey;
      } else {
        delete process.env.ANTHROPIC_API_KEY;
      }
    });

    it('should use all config when endpoint config is missing', async () => {
      // Set 'all' config without endpoint-specific config
      mockReq.config = {
        endpoints: {
          all: {
            titleModel: 'gpt-4o-mini',
            titlePrompt: 'All config title prompt',
            titleMethod: 'completion',
            titlePromptTemplate: 'All config template: {{content}}',
          },
        },
      };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      // Verify generateTitle was called with 'all' config values
      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titleMethod: 'completion',
          titlePrompt: 'All config title prompt',
          titlePromptTemplate: 'All config template: {{content}}',
        }),
      );

      // Check that the model was set from 'all' config
      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('gpt-4o-mini');
    });

    it('should prioritize all config over endpoint config for title settings', async () => {
      // Set both endpoint and 'all' config
      mockReq.config = {
        endpoints: {
          [EModelEndpoint.openAI]: {
            titleModel: 'gpt-3.5-turbo',
            titlePrompt: 'Endpoint title prompt',
            titleMethod: 'structured',
            // titlePromptTemplate is omitted to test fallback
          },
          all: {
            titleModel: 'gpt-4o-mini',
            titlePrompt: 'All config title prompt',
            titleMethod: 'completion',
            titlePromptTemplate: 'All config template',
          },
        },
      };

      const text = 'Test conversation text';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      // Verify 'all' config takes precedence over endpoint config
      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          titleMethod: 'completion',
          titlePrompt: 'All config title prompt',
          titlePromptTemplate: 'All config template',
        }),
      );

      // Check that the model was set from 'all' config
      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('gpt-4o-mini');
    });

    it('should use all config with titleEndpoint and verify provider switch', async () => {
      // Mock the API key for the titleEndpoint provider
      const originalApiKey = process.env.ANTHROPIC_API_KEY;
      process.env.ANTHROPIC_API_KEY = 'test-anthropic-key';

      // Set comprehensive 'all' config with all new title options
      mockReq.config = {
        endpoints: {
          all: {
            titleConvo: true,
            titleModel: 'claude-3-haiku-20240307',
            titleMethod: 'completion', // Testing the new default method
            titlePrompt: 'Generate a concise, descriptive title for this conversation',
            titlePromptTemplate: 'Conversation summary: {{content}}',
            titleEndpoint: EModelEndpoint.anthropic, // Should switch provider to Anthropic
          },
        },
      };

      const text = 'Test conversation about AI and machine learning';
      const abortController = new AbortController();

      await client.titleConvo({ text, abortController });

      // Verify all config values were used
      expect(mockRun.generateTitle).toHaveBeenCalledWith(
        expect.objectContaining({
          provider: Providers.ANTHROPIC, // Critical: Verify provider switched to Anthropic
          titleMethod: 'completion',
          titlePrompt: 'Generate a concise, descriptive title for this conversation',
          titlePromptTemplate: 'Conversation summary: {{content}}',
          inputText: text,
          contentParts: client.contentParts,
        }),
      );

      // Verify the model was set from 'all' config
      const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
      expect(generateTitleCall.clientOptions.model).toBe('claude-3-haiku-20240307');

      // Verify other client options are set correctly
      expect(generateTitleCall.clientOptions).toMatchObject({
        model: 'claude-3-haiku-20240307',
        // Note: Anthropic's getOptions may set its own maxTokens value
      });

      // Restore the original API key
      if (originalApiKey) {
        process.env.ANTHROPIC_API_KEY = originalApiKey;
      } else {
        delete process.env.ANTHROPIC_API_KEY;
      }
    });

    it('should test all titleMethod options from all config', async () => {
      // Test each titleMethod: 'completion', 'functions', 'structured'
      const titleMethods = ['completion', 'functions', 'structured'];

      for (const method of titleMethods) {
        // Clear previous calls
        mockRun.generateTitle.mockClear();

        // Set 'all' config with specific titleMethod
        mockReq.config = {
          endpoints: {
            all: {
              titleModel: 'gpt-4o-mini',
              titleMethod: method,
              titlePrompt: `Testing ${method} method`,
              titlePromptTemplate: `Template for ${method}: {{content}}`,
            },
          },
        };

        const text = `Test conversation for ${method} method`;
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify the correct titleMethod was used
        expect(mockRun.generateTitle).toHaveBeenCalledWith(
          expect.objectContaining({
            titleMethod: method,
            titlePrompt: `Testing ${method} method`,
            titlePromptTemplate: `Template for ${method}: {{content}}`,
          }),
        );
      }
    });

    describe('Azure-specific title generation', () => {
      let originalEnv;

      beforeEach(() => {
        // Reset mocks
        jest.clearAllMocks();

        // Save original environment variables
        originalEnv = { ...process.env };

        // Mock Azure API keys
        process.env.AZURE_OPENAI_API_KEY = 'test-azure-key';
        process.env.AZURE_API_KEY = 'test-azure-key';
        process.env.EASTUS_API_KEY = 'test-eastus-key';
        process.env.EASTUS2_API_KEY = 'test-eastus2-key';
      });

      afterEach(() => {
        // Restore environment variables
        process.env = originalEnv;
      });

      it('should use OPENAI provider for Azure serverless endpoints', async () => {
        // Set up Azure endpoint with serverless config
        mockAgent.endpoint = EModelEndpoint.azureOpenAI;
        mockAgent.provider = EModelEndpoint.azureOpenAI;
        mockReq.config = {
          endpoints: {
            [EModelEndpoint.azureOpenAI]: {
              titleConvo: true,
              titleModel: 'grok-3',
              titleMethod: 'completion',
              titlePrompt: 'Azure serverless title prompt',
              streamRate: 35,
              modelGroupMap: {
                'grok-3': {
                  group: 'Azure AI Foundry',
                  deploymentName: 'grok-3',
                },
              },
              groupMap: {
                'Azure AI Foundry': {
                  apiKey: '${AZURE_API_KEY}',
                  baseURL: 'https://test.services.ai.azure.com/models',
                  version: '2024-05-01-preview',
                  serverless: true,
                  models: {
                    'grok-3': {
                      deploymentName: 'grok-3',
                    },
                  },
                },
              },
            },
          },
        };
        mockReq.body.endpoint = EModelEndpoint.azureOpenAI;
        mockReq.body.model = 'grok-3';

        const text = 'Test Azure serverless conversation';
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify provider was switched to OPENAI for serverless
        expect(mockRun.generateTitle).toHaveBeenCalledWith(
          expect.objectContaining({
            provider: Providers.OPENAI, // Should be OPENAI for serverless
            titleMethod: 'completion',
            titlePrompt: 'Azure serverless title prompt',
          }),
        );
      });

      it('should use AZURE provider for Azure endpoints with instanceName', async () => {
        // Set up Azure endpoint
        mockAgent.endpoint = EModelEndpoint.azureOpenAI;
        mockAgent.provider = EModelEndpoint.azureOpenAI;
        mockReq.config = {
          endpoints: {
            [EModelEndpoint.azureOpenAI]: {
              titleConvo: true,
              titleModel: 'gpt-4o',
              titleMethod: 'structured',
              titlePrompt: 'Azure instance title prompt',
              streamRate: 35,
              modelGroupMap: {
                'gpt-4o': {
                  group: 'eastus',
                  deploymentName: 'gpt-4o',
                },
              },
              groupMap: {
                eastus: {
                  apiKey: '${EASTUS_API_KEY}',
                  instanceName: 'region-instance',
                  version: '2024-02-15-preview',
                  models: {
                    'gpt-4o': {
                      deploymentName: 'gpt-4o',
                    },
                  },
                },
              },
            },
          },
        };
        mockReq.body.endpoint = EModelEndpoint.azureOpenAI;
        mockReq.body.model = 'gpt-4o';

        const text = 'Test Azure instance conversation';
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify provider remains AZURE with instanceName
        expect(mockRun.generateTitle).toHaveBeenCalledWith(
          expect.objectContaining({
            provider: Providers.AZURE,
            titleMethod: 'structured',
            titlePrompt: 'Azure instance title prompt',
          }),
        );
      });

      it('should handle Azure titleModel with CURRENT_MODEL constant', async () => {
        // Set up Azure endpoint
        mockAgent.endpoint = EModelEndpoint.azureOpenAI;
        mockAgent.provider = EModelEndpoint.azureOpenAI;
        mockAgent.model_parameters.model = 'gpt-4o-latest';
        mockReq.config = {
          endpoints: {
            [EModelEndpoint.azureOpenAI]: {
              titleConvo: true,
              titleModel: Constants.CURRENT_MODEL,
              titleMethod: 'functions',
              streamRate: 35,
              modelGroupMap: {
                'gpt-4o-latest': {
                  group: 'region-eastus',
                  deploymentName: 'gpt-4o-mini',
                  version: '2024-02-15-preview',
                },
              },
              groupMap: {
                'region-eastus': {
                  apiKey: '${EASTUS2_API_KEY}',
                  instanceName: 'test-instance',
                  version: '2024-12-01-preview',
                  models: {
                    'gpt-4o-latest': {
                      deploymentName: 'gpt-4o-mini',
                      version: '2024-02-15-preview',
                    },
                  },
                },
              },
            },
          },
        };
        mockReq.body.endpoint = EModelEndpoint.azureOpenAI;
        mockReq.body.model = 'gpt-4o-latest';

        const text = 'Test Azure current model';
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify it uses the correct model when titleModel is CURRENT_MODEL
        const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
        // When CURRENT_MODEL is used with Azure, the model gets mapped to the deployment name
        // In this case, 'gpt-4o-latest' is mapped to 'gpt-4o-mini' deployment
        expect(generateTitleCall.clientOptions.model).toBe('gpt-4o-mini');
        // Also verify that CURRENT_MODEL constant was not passed as the model
        expect(generateTitleCall.clientOptions.model).not.toBe(Constants.CURRENT_MODEL);
      });

      it('should handle Azure with multiple model groups', async () => {
        // Set up Azure endpoint
        mockAgent.endpoint = EModelEndpoint.azureOpenAI;
        mockAgent.provider = EModelEndpoint.azureOpenAI;
        mockReq.config = {
          endpoints: {
            [EModelEndpoint.azureOpenAI]: {
              titleConvo: true,
              titleModel: 'o1-mini',
              titleMethod: 'completion',
              streamRate: 35,
              modelGroupMap: {
                'gpt-4o': {
                  group: 'eastus',
                  deploymentName: 'gpt-4o',
                },
                'o1-mini': {
                  group: 'region-eastus',
                  deploymentName: 'o1-mini',
                },
                'codex-mini': {
                  group: 'codex-mini',
                  deploymentName: 'codex-mini',
                },
              },
              groupMap: {
                eastus: {
                  apiKey: '${EASTUS_API_KEY}',
                  instanceName: 'region-eastus',
                  version: '2024-02-15-preview',
                  models: {
                    'gpt-4o': {
                      deploymentName: 'gpt-4o',
                    },
                  },
                },
                'region-eastus': {
                  apiKey: '${EASTUS2_API_KEY}',
                  instanceName: 'region-eastus2',
                  version: '2024-12-01-preview',
                  models: {
                    'o1-mini': {
                      deploymentName: 'o1-mini',
                    },
                  },
                },
                'codex-mini': {
                  apiKey: '${AZURE_API_KEY}',
                  baseURL: 'https://example.cognitiveservices.azure.com/openai/',
                  version: '2025-04-01-preview',
                  serverless: true,
                  models: {
                    'codex-mini': {
                      deploymentName: 'codex-mini',
                    },
                  },
                },
              },
            },
          },
        };
        mockReq.body.endpoint = EModelEndpoint.azureOpenAI;
        mockReq.body.model = 'o1-mini';

        const text = 'Test Azure multi-group conversation';
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify correct model and provider are used
        expect(mockRun.generateTitle).toHaveBeenCalledWith(
          expect.objectContaining({
            provider: Providers.AZURE,
            titleMethod: 'completion',
          }),
        );

        const generateTitleCall = mockRun.generateTitle.mock.calls[0][0];
        expect(generateTitleCall.clientOptions.model).toBe('o1-mini');
        expect(generateTitleCall.clientOptions.maxTokens).toBeUndefined(); // o1 models shouldn't have maxTokens
      });

      it('should use all config as fallback for Azure endpoints', async () => {
        // Set up Azure endpoint with minimal config
        mockAgent.endpoint = EModelEndpoint.azureOpenAI;
        mockAgent.provider = EModelEndpoint.azureOpenAI;
        mockReq.body.endpoint = EModelEndpoint.azureOpenAI;
        mockReq.body.model = 'gpt-4';

        // Set 'all' config as fallback with a serverless Azure config
        mockReq.config = {
          endpoints: {
            all: {
              titleConvo: true,
              titleModel: 'gpt-4',
              titleMethod: 'structured',
              titlePrompt: 'Fallback title prompt from all config',
              titlePromptTemplate: 'Template: {{content}}',
              modelGroupMap: {
                'gpt-4': {
                  group: 'default-group',
                  deploymentName: 'gpt-4',
                },
              },
              groupMap: {
                'default-group': {
                  apiKey: '${AZURE_API_KEY}',
                  baseURL: 'https://default.openai.azure.com/',
                  version: '2024-02-15-preview',
                  serverless: true,
                  models: {
                    'gpt-4': {
                      deploymentName: 'gpt-4',
                    },
                  },
                },
              },
            },
          },
        };

        const text = 'Test Azure with all config fallback';
        const abortController = new AbortController();

        await client.titleConvo({ text, abortController });

        // Verify all config is used
        expect(mockRun.generateTitle).toHaveBeenCalledWith(
          expect.objectContaining({
            provider: Providers.OPENAI, // Should be OPENAI when no instanceName
            titleMethod: 'structured',
            titlePrompt: 'Fallback title prompt from all config',
            titlePromptTemplate: 'Template: {{content}}',
          }),
        );
      });
    });
  });

  describe('getOptions method - GPT-5+ model handling', () => {
    let mockReq;
    let mockRes;
    let mockAgent;
    let mockOptions;

    beforeEach(() => {
      jest.clearAllMocks();

      mockAgent = {
        id: 'agent-123',
        endpoint: EModelEndpoint.openAI,
        provider: EModelEndpoint.openAI,
        model_parameters: {
          model: 'gpt-5',
        },
      };

      mockReq = {
        app: {
          locals: {},
        },
        user: {
          id: 'user-123',
        },
      };

      mockRes = {};

      mockOptions = {
        req: mockReq,
        res: mockRes,
        agent: mockAgent,
      };

      client = new AgentClient(mockOptions);
    });

    it('should move maxTokens to modelKwargs.max_completion_tokens for GPT-5 models', () => {
      const clientOptions = {
        model: 'gpt-5',
        maxTokens: 2048,
        temperature: 0.7,
      };

      // Simulate the getOptions logic that handles GPT-5+ models
      if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
        clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
        clientOptions.modelKwargs.max_completion_tokens = clientOptions.maxTokens;
        delete clientOptions.maxTokens;
      }

      expect(clientOptions.maxTokens).toBeUndefined();
      expect(clientOptions.modelKwargs).toBeDefined();
      expect(clientOptions.modelKwargs.max_completion_tokens).toBe(2048);
      expect(clientOptions.temperature).toBe(0.7); // Other options should remain
    });

    it('should move maxTokens to modelKwargs.max_output_tokens for GPT-5 models with useResponsesApi', () => {
      const clientOptions = {
        model: 'gpt-5',
        maxTokens: 2048,
        temperature: 0.7,
        useResponsesApi: true,
      };

      if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
        clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
        const paramName =
          clientOptions.useResponsesApi === true ? 'max_output_tokens' : 'max_completion_tokens';
        clientOptions.modelKwargs[paramName] = clientOptions.maxTokens;
        delete clientOptions.maxTokens;
      }

      expect(clientOptions.maxTokens).toBeUndefined();
      expect(clientOptions.modelKwargs).toBeDefined();
      expect(clientOptions.modelKwargs.max_output_tokens).toBe(2048);
      expect(clientOptions.temperature).toBe(0.7); // Other options should remain
    });

    it('should handle GPT-5+ models with existing modelKwargs', () => {
      const clientOptions = {
        model: 'gpt-6',
        maxTokens: 1500,
        temperature: 0.8,
        modelKwargs: {
          customParam: 'value',
        },
      };

      // Simulate the getOptions logic
      if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
        clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
        clientOptions.modelKwargs.max_completion_tokens = clientOptions.maxTokens;
        delete clientOptions.maxTokens;
      }

      expect(clientOptions.maxTokens).toBeUndefined();
      expect(clientOptions.modelKwargs).toEqual({
        customParam: 'value',
        max_completion_tokens: 1500,
      });
    });

    it('should not modify maxTokens for non-GPT-5+ models', () => {
      const clientOptions = {
        model: 'gpt-4',
        maxTokens: 2048,
        temperature: 0.7,
      };

      // Simulate the getOptions logic
      if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
        clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
        clientOptions.modelKwargs.max_completion_tokens = clientOptions.maxTokens;
        delete clientOptions.maxTokens;
      }

      // Should not be modified since it's GPT-4
      expect(clientOptions.maxTokens).toBe(2048);
      expect(clientOptions.modelKwargs).toBeUndefined();
    });

    it('should handle various GPT-5+ model formats', () => {
      const testCases = [
        { model: 'gpt-5', shouldTransform: true },
        { model: 'gpt-5-turbo', shouldTransform: true },
        { model: 'gpt-6', shouldTransform: true },
        { model: 'gpt-7-preview', shouldTransform: true },
        { model: 'gpt-8', shouldTransform: true },
        { model: 'gpt-9-mini', shouldTransform: true },
        { model: 'gpt-4', shouldTransform: false },
        { model: 'gpt-4o', shouldTransform: false },
        { model: 'gpt-3.5-turbo', shouldTransform: false },
        { model: 'claude-3', shouldTransform: false },
      ];

      testCases.forEach(({ model, shouldTransform }) => {
        const clientOptions = {
          model,
          maxTokens: 1000,
        };

        // Simulate the getOptions logic
        if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
          clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
          clientOptions.modelKwargs.max_completion_tokens = clientOptions.maxTokens;
          delete clientOptions.maxTokens;
        }

        if (shouldTransform) {
          expect(clientOptions.maxTokens).toBeUndefined();
          expect(clientOptions.modelKwargs?.max_completion_tokens).toBe(1000);
        } else {
          expect(clientOptions.maxTokens).toBe(1000);
          expect(clientOptions.modelKwargs).toBeUndefined();
        }
      });
    });

    it('should not swap max token param for older models when using useResponsesApi', () => {
      const testCases = [
        { model: 'gpt-5', shouldTransform: true },
        { model: 'gpt-5-turbo', shouldTransform: true },
        { model: 'gpt-6', shouldTransform: true },
        { model: 'gpt-7-preview', shouldTransform: true },
        { model: 'gpt-8', shouldTransform: true },
        { model: 'gpt-9-mini', shouldTransform: true },
        { model: 'gpt-4', shouldTransform: false },
        { model: 'gpt-4o', shouldTransform: false },
        { model: 'gpt-3.5-turbo', shouldTransform: false },
        { model: 'claude-3', shouldTransform: false },
      ];

      testCases.forEach(({ model, shouldTransform }) => {
        const clientOptions = {
          model,
          maxTokens: 1000,
          useResponsesApi: true,
        };

        if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
          clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
          const paramName =
            clientOptions.useResponsesApi === true ? 'max_output_tokens' : 'max_completion_tokens';
          clientOptions.modelKwargs[paramName] = clientOptions.maxTokens;
          delete clientOptions.maxTokens;
        }

        if (shouldTransform) {
          expect(clientOptions.maxTokens).toBeUndefined();
          expect(clientOptions.modelKwargs?.max_output_tokens).toBe(1000);
        } else {
          expect(clientOptions.maxTokens).toBe(1000);
          expect(clientOptions.modelKwargs).toBeUndefined();
        }
      });
    });

    it('should not transform if maxTokens is null or undefined', () => {
      const testCases = [
        { model: 'gpt-5', maxTokens: null },
        { model: 'gpt-5', maxTokens: undefined },
        { model: 'gpt-6', maxTokens: 0 }, // Should transform even if 0
      ];

      testCases.forEach(({ model, maxTokens }, index) => {
        const clientOptions = {
          model,
          maxTokens,
          temperature: 0.7,
        };

        // Simulate the getOptions logic
        if (/\bgpt-[5-9]\b/i.test(clientOptions.model) && clientOptions.maxTokens != null) {
          clientOptions.modelKwargs = clientOptions.modelKwargs ?? {};
          clientOptions.modelKwargs.max_completion_tokens = clientOptions.maxTokens;
          delete clientOptions.maxTokens;
        }

        if (index < 2) {
          // null or undefined cases
          expect(clientOptions.maxTokens).toBe(maxTokens);
          expect(clientOptions.modelKwargs).toBeUndefined();
        } else {
          // 0 case - should transform
          expect(clientOptions.maxTokens).toBeUndefined();
          expect(clientOptions.modelKwargs?.max_completion_tokens).toBe(0);
        }
      });
    });
  });

  describe('runMemory method', () => {
    let client;
    let mockReq;
    let mockRes;
    let mockAgent;
    let mockOptions;
    let mockProcessMemory;

    beforeEach(() => {
      jest.clearAllMocks();

      mockAgent = {
        id: 'agent-123',
        endpoint: EModelEndpoint.openAI,
        provider: EModelEndpoint.openAI,
        model_parameters: {
          model: 'gpt-4',
        },
      };

      mockReq = {
        user: {
          id: 'user-123',
          personalization: {
            memories: true,
          },
        },
      };

      // Mock getAppConfig for memory tests
      mockReq.config = {
        memory: {
          messageWindowSize: 3,
        },
      };

      mockRes = {};

      mockOptions = {
        req: mockReq,
        res: mockRes,
        agent: mockAgent,
      };

      mockProcessMemory = jest.fn().mockResolvedValue([]);

      client = new AgentClient(mockOptions);
      client.processMemory = mockProcessMemory;
      client.conversationId = 'convo-123';
      client.responseMessageId = 'response-123';
    });

    it('should filter out image URLs from message content', async () => {
      const { HumanMessage, AIMessage } = require('@langchain/core/messages');
      const messages = [
        new HumanMessage({
          content: [
            {
              type: 'text',
              text: 'What is in this image?',
            },
            {
              type: 'image_url',
              image_url: {
                url: 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVR42mNkYPhfDwAChwGA60e6kgAAAABJRU5ErkJggg==',
                detail: 'auto',
              },
            },
          ],
        }),
        new AIMessage('I can see a small red pixel in the image.'),
        new HumanMessage({
          content: [
            {
              type: 'text',
              text: 'What about this one?',
            },
            {
              type: 'image_url',
              image_url: {
                url: 'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/',
                detail: 'high',
              },
            },
          ],
        }),
      ];

      await client.runMemory(messages);

      expect(mockProcessMemory).toHaveBeenCalledTimes(1);
      const processedMessage = mockProcessMemory.mock.calls[0][0][0];

      // Verify the buffer message was created
      expect(processedMessage.constructor.name).toBe('HumanMessage');
      expect(processedMessage.content).toContain('# Current Chat:');

      // Verify that image URLs are not in the buffer string
      expect(processedMessage.content).not.toContain('image_url');
      expect(processedMessage.content).not.toContain('data:image');
      expect(processedMessage.content).not.toContain('base64');

      // Verify text content is preserved
      expect(processedMessage.content).toContain('What is in this image?');
      expect(processedMessage.content).toContain('I can see a small red pixel in the image.');
      expect(processedMessage.content).toContain('What about this one?');
    });

    it('should handle messages with only text content', async () => {
      const { HumanMessage, AIMessage } = require('@langchain/core/messages');
      const messages = [
        new HumanMessage('Hello, how are you?'),
        new AIMessage('I am doing well, thank you!'),
        new HumanMessage('That is great to hear.'),
      ];

      await client.runMemory(messages);

      expect(mockProcessMemory).toHaveBeenCalledTimes(1);
      const processedMessage = mockProcessMemory.mock.calls[0][0][0];

      expect(processedMessage.content).toContain('Hello, how are you?');
      expect(processedMessage.content).toContain('I am doing well, thank you!');
      expect(processedMessage.content).toContain('That is great to hear.');
    });

    it('should handle mixed content types correctly', async () => {
      const { HumanMessage } = require('@langchain/core/messages');
      const { ContentTypes } = require('librechat-data-provider');

      const messages = [
        new HumanMessage({
          content: [
            {
              type: 'text',
              text: 'Here is some text',
            },
            {
              type: ContentTypes.IMAGE_URL,
              image_url: {
                url: 'https://example.com/image.png',
              },
            },
            {
              type: 'text',
              text: ' and more text',
            },
          ],
        }),
      ];

      await client.runMemory(messages);

      expect(mockProcessMemory).toHaveBeenCalledTimes(1);
      const processedMessage = mockProcessMemory.mock.calls[0][0][0];

      // Should contain text parts but not image URLs
      expect(processedMessage.content).toContain('Here is some text');
      expect(processedMessage.content).toContain('and more text');
      expect(processedMessage.content).not.toContain('example.com/image.png');
      expect(processedMessage.content).not.toContain('IMAGE_URL');
    });

    it('should preserve original messages without mutation', async () => {
      const { HumanMessage } = require('@langchain/core/messages');
      const originalContent = [
        {
          type: 'text',
          text: 'Original text',
        },
        {
          type: 'image_url',
          image_url: {
            url: 'data:image/png;base64,ABC123',
          },
        },
      ];

      const messages = [
        new HumanMessage({
          content: [...originalContent],
        }),
      ];

      await client.runMemory(messages);

      // Verify original message wasn't mutated
      expect(messages[0].content).toHaveLength(2);
      expect(messages[0].content[1].type).toBe('image_url');
      expect(messages[0].content[1].image_url.url).toBe('data:image/png;base64,ABC123');
    });

    it('should handle message window size correctly', async () => {
      const { HumanMessage, AIMessage } = require('@langchain/core/messages');
      const messages = [
        new HumanMessage('Message 1'),
        new AIMessage('Response 1'),
        new HumanMessage('Message 2'),
        new AIMessage('Response 2'),
        new HumanMessage('Message 3'),
        new AIMessage('Response 3'),
      ];

      // Window size is set to 3 in mockReq
      await client.runMemory(messages);

      expect(mockProcessMemory).toHaveBeenCalledTimes(1);
      const processedMessage = mockProcessMemory.mock.calls[0][0][0];

      // Should only include last 3 messages due to window size
      expect(processedMessage.content).toContain('Message 3');
      expect(processedMessage.content).toContain('Response 3');
      expect(processedMessage.content).not.toContain('Message 1');
      expect(processedMessage.content).not.toContain('Response 1');
    });

    it('should return early if processMemory is not set', async () => {
      const { HumanMessage } = require('@langchain/core/messages');
      client.processMemory = null;

      const result = await client.runMemory([new HumanMessage('Test')]);

      expect(result).toBeUndefined();
      expect(mockProcessMemory).not.toHaveBeenCalled();
    });
  });
});