const mongoose = require('mongoose');
const { v4: uuidv4 } = require('uuid');
const { MongoMemoryServer } = require('mongodb-memory-server');
const { agentSchema } = require('@librechat/data-schemas');

// Only mock the dependencies that are not database-related
jest.mock('~/server/services/Config', () => ({
  getCachedTools: jest.fn().mockResolvedValue({
    web_search: true,
    execute_code: true,
    file_search: true,
  }),
}));

jest.mock('~/models/Project', () => ({
  getProjectByName: jest.fn().mockResolvedValue(null),
}));

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

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

jest.mock('~/server/services/Files/S3/crud', () => ({
  refreshS3Url: jest.fn(),
}));

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

jest.mock('~/models/Action', () => ({
  updateAction: jest.fn(),
  getActions: jest.fn().mockResolvedValue([]),
}));

jest.mock('~/models/File', () => ({
  deleteFileByFilter: jest.fn(),
}));

const { createAgent: createAgentHandler, updateAgent: updateAgentHandler } = require('./v1');

/**
 * @type {import('mongoose').Model<import('@librechat/data-schemas').IAgent>}
 */
let Agent;

describe('Agent Controllers - Mass Assignment Protection', () => {
  let mongoServer;
  let mockReq;
  let mockRes;

  beforeAll(async () => {
    mongoServer = await MongoMemoryServer.create();
    const mongoUri = mongoServer.getUri();
    await mongoose.connect(mongoUri);
    Agent = mongoose.models.Agent || mongoose.model('Agent', agentSchema);
  }, 20000);

  afterAll(async () => {
    await mongoose.disconnect();
    await mongoServer.stop();
  });

  beforeEach(async () => {
    await Agent.deleteMany({});

    // Reset all mocks
    jest.clearAllMocks();

    // Setup mock request and response objects
    mockReq = {
      user: {
        id: new mongoose.Types.ObjectId().toString(),
        role: 'USER',
      },
      body: {},
      params: {},
      app: {
        locals: {
          fileStrategy: 'local',
        },
      },
    };

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

  describe('createAgentHandler', () => {
    test('should create agent with allowed fields only', async () => {
      const validData = {
        name: 'Test Agent',
        description: 'A test agent',
        instructions: 'Be helpful',
        provider: 'openai',
        model: 'gpt-4',
        tools: ['web_search'],
        model_parameters: { temperature: 0.7 },
        tool_resources: {
          file_search: { file_ids: ['file1', 'file2'] },
        },
      };

      mockReq.body = validData;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);
      expect(mockRes.json).toHaveBeenCalled();

      const createdAgent = mockRes.json.mock.calls[0][0];
      expect(createdAgent.name).toBe('Test Agent');
      expect(createdAgent.description).toBe('A test agent');
      expect(createdAgent.provider).toBe('openai');
      expect(createdAgent.model).toBe('gpt-4');
      expect(createdAgent.author.toString()).toBe(mockReq.user.id);
      expect(createdAgent.tools).toContain('web_search');

      // Verify in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id });
      expect(agentInDb).toBeDefined();
      expect(agentInDb.name).toBe('Test Agent');
      expect(agentInDb.author.toString()).toBe(mockReq.user.id);
    });

    test('should reject creation with unauthorized fields (mass assignment protection)', async () => {
      const maliciousData = {
        // Required fields
        provider: 'openai',
        model: 'gpt-4',
        name: 'Malicious Agent',

        // Unauthorized fields that should be stripped
        author: new mongoose.Types.ObjectId().toString(), // Should not be able to set author
        authorName: 'Hacker', // Should be stripped
        isCollaborative: true, // Should be stripped on creation
        versions: [], // Should be stripped
        _id: new mongoose.Types.ObjectId(), // Should be stripped
        id: 'custom_agent_id', // Should be overridden
        createdAt: new Date('2020-01-01'), // Should be stripped
        updatedAt: new Date('2020-01-01'), // Should be stripped
      };

      mockReq.body = maliciousData;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];

      // Verify unauthorized fields were not set
      expect(createdAgent.author.toString()).toBe(mockReq.user.id); // Should be the request user, not the malicious value
      expect(createdAgent.authorName).toBeUndefined();
      expect(createdAgent.isCollaborative).toBeFalsy();
      expect(createdAgent.versions).toHaveLength(1); // Should have exactly 1 version from creation
      expect(createdAgent.id).not.toBe('custom_agent_id'); // Should have generated ID
      expect(createdAgent.id).toMatch(/^agent_/); // Should have proper prefix

      // Verify timestamps are recent (not the malicious dates)
      const createdTime = new Date(createdAgent.createdAt).getTime();
      const now = Date.now();
      expect(now - createdTime).toBeLessThan(5000); // Created within last 5 seconds

      // Verify in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id });
      expect(agentInDb.author.toString()).toBe(mockReq.user.id);
      expect(agentInDb.authorName).toBeUndefined();
    });

    test('should validate required fields', async () => {
      const invalidData = {
        name: 'Missing Required Fields',
        // Missing provider and model
      };

      mockReq.body = invalidData;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          error: 'Invalid request data',
          details: expect.any(Array),
        }),
      );

      // Verify nothing was created in database
      const count = await Agent.countDocuments();
      expect(count).toBe(0);
    });

    test('should handle tool_resources validation', async () => {
      const dataWithInvalidToolResources = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Tool Resources',
        tool_resources: {
          // Valid resources
          file_search: {
            file_ids: ['file1', 'file2'],
            vector_store_ids: ['vs1'],
          },
          execute_code: {
            file_ids: ['file3'],
          },
          // Invalid resource (should be stripped by schema)
          invalid_resource: {
            file_ids: ['file4'],
          },
        },
      };

      mockReq.body = dataWithInvalidToolResources;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];
      expect(createdAgent.tool_resources).toBeDefined();
      expect(createdAgent.tool_resources.file_search).toBeDefined();
      expect(createdAgent.tool_resources.execute_code).toBeDefined();
      expect(createdAgent.tool_resources.invalid_resource).toBeUndefined(); // Should be stripped

      // Verify in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id });
      expect(agentInDb.tool_resources.invalid_resource).toBeUndefined();
    });

    test('should handle support_contact with empty strings', async () => {
      const dataWithEmptyContact = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Empty Contact',
        support_contact: {
          name: '',
          email: '',
        },
      };

      mockReq.body = dataWithEmptyContact;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];
      expect(createdAgent.name).toBe('Agent with Empty Contact');
      expect(createdAgent.support_contact).toBeDefined();
      expect(createdAgent.support_contact.name).toBe('');
      expect(createdAgent.support_contact.email).toBe('');
    });

    test('should handle support_contact with valid email', async () => {
      const dataWithValidContact = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Valid Contact',
        support_contact: {
          name: 'Support Team',
          email: 'support@example.com',
        },
      };

      mockReq.body = dataWithValidContact;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];
      expect(createdAgent.support_contact).toBeDefined();
      expect(createdAgent.support_contact.name).toBe('Support Team');
      expect(createdAgent.support_contact.email).toBe('support@example.com');
    });

    test('should reject support_contact with invalid email', async () => {
      const dataWithInvalidEmail = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Invalid Email',
        support_contact: {
          name: 'Support',
          email: 'not-an-email',
        },
      };

      mockReq.body = dataWithInvalidEmail;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          error: 'Invalid request data',
          details: expect.arrayContaining([
            expect.objectContaining({
              path: ['support_contact', 'email'],
            }),
          ]),
        }),
      );
    });

    test('should handle avatar validation', async () => {
      const dataWithAvatar = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Avatar',
        avatar: {
          filepath: 'https://example.com/avatar.png',
          source: 's3',
        },
      };

      mockReq.body = dataWithAvatar;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];
      expect(createdAgent.avatar).toEqual({
        filepath: 'https://example.com/avatar.png',
        source: 's3',
      });
    });

    test('should handle invalid avatar format', async () => {
      const dataWithInvalidAvatar = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Agent with Invalid Avatar',
        avatar: 'just-a-string', // Invalid format
      };

      mockReq.body = dataWithInvalidAvatar;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          error: 'Invalid request data',
        }),
      );
    });
  });

  describe('updateAgentHandler', () => {
    let existingAgentId;
    let existingAgentAuthorId;

    beforeEach(async () => {
      // Create an existing agent for update tests
      existingAgentAuthorId = new mongoose.Types.ObjectId();
      const agent = await Agent.create({
        id: `agent_${uuidv4()}`,
        name: 'Original Agent',
        provider: 'openai',
        model: 'gpt-3.5-turbo',
        author: existingAgentAuthorId,
        description: 'Original description',
        isCollaborative: false,
        versions: [
          {
            name: 'Original Agent',
            provider: 'openai',
            model: 'gpt-3.5-turbo',
            description: 'Original description',
            createdAt: new Date(),
            updatedAt: new Date(),
          },
        ],
      });
      existingAgentId = agent.id;
    });

    test('should update agent with allowed fields only', async () => {
      mockReq.user.id = existingAgentAuthorId.toString(); // Set as author
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        name: 'Updated Agent',
        description: 'Updated description',
        model: 'gpt-4',
        isCollaborative: true, // This IS allowed in updates
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.status).not.toHaveBeenCalledWith(400);
      expect(mockRes.status).not.toHaveBeenCalledWith(403);
      expect(mockRes.json).toHaveBeenCalled();

      const updatedAgent = mockRes.json.mock.calls[0][0];
      expect(updatedAgent.name).toBe('Updated Agent');
      expect(updatedAgent.description).toBe('Updated description');
      expect(updatedAgent.model).toBe('gpt-4');
      expect(updatedAgent.isCollaborative).toBe(true);
      expect(updatedAgent.author).toBe(existingAgentAuthorId.toString());

      // Verify in database
      const agentInDb = await Agent.findOne({ id: existingAgentId });
      expect(agentInDb.name).toBe('Updated Agent');
      expect(agentInDb.isCollaborative).toBe(true);
    });

    test('should reject update with unauthorized fields (mass assignment protection)', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        name: 'Updated Name',

        // Unauthorized fields that should be stripped
        author: new mongoose.Types.ObjectId().toString(), // Should not be able to change author
        authorName: 'Hacker', // Should be stripped
        id: 'different_agent_id', // Should be stripped
        _id: new mongoose.Types.ObjectId(), // Should be stripped
        versions: [], // Should be stripped
        createdAt: new Date('2020-01-01'), // Should be stripped
        updatedAt: new Date('2020-01-01'), // Should be stripped
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalled();

      const updatedAgent = mockRes.json.mock.calls[0][0];

      // Verify unauthorized fields were not changed
      expect(updatedAgent.author).toBe(existingAgentAuthorId.toString()); // Should not have changed
      expect(updatedAgent.authorName).toBeUndefined();
      expect(updatedAgent.id).toBe(existingAgentId); // Should not have changed
      expect(updatedAgent.name).toBe('Updated Name'); // Only this should have changed

      // Verify in database
      const agentInDb = await Agent.findOne({ id: existingAgentId });
      expect(agentInDb.author.toString()).toBe(existingAgentAuthorId.toString());
      expect(agentInDb.id).toBe(existingAgentId);
    });

    test('should allow admin to update any agent', async () => {
      const adminUserId = new mongoose.Types.ObjectId().toString();
      mockReq.user.id = adminUserId;
      mockReq.user.role = 'ADMIN'; // Set as admin
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        name: 'Admin Update',
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.status).not.toHaveBeenCalledWith(403);
      expect(mockRes.json).toHaveBeenCalled();

      const updatedAgent = mockRes.json.mock.calls[0][0];
      expect(updatedAgent.name).toBe('Admin Update');
    });

    test('should handle projectIds updates', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = existingAgentId;

      const projectId1 = new mongoose.Types.ObjectId().toString();
      const projectId2 = new mongoose.Types.ObjectId().toString();

      mockReq.body = {
        projectIds: [projectId1, projectId2],
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalled();

      const updatedAgent = mockRes.json.mock.calls[0][0];
      expect(updatedAgent).toBeDefined();
      // Note: updateAgentProjects requires more setup, so we just verify the handler doesn't crash
    });

    test('should validate tool_resources in updates', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        tool_resources: {
          ocr: {
            file_ids: ['ocr1', 'ocr2'],
          },
          execute_code: {
            file_ids: ['img1'],
          },
          // Invalid tool resource
          invalid_tool: {
            file_ids: ['invalid'],
          },
        },
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalled();

      const updatedAgent = mockRes.json.mock.calls[0][0];
      expect(updatedAgent.tool_resources).toBeDefined();
      expect(updatedAgent.tool_resources.ocr).toBeDefined();
      expect(updatedAgent.tool_resources.execute_code).toBeDefined();
      expect(updatedAgent.tool_resources.invalid_tool).toBeUndefined();
    });

    test('should return 404 for non-existent agent', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = `agent_${uuidv4()}`; // Non-existent ID
      mockReq.body = {
        name: 'Update Non-existent',
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(404);
      expect(mockRes.json).toHaveBeenCalledWith({ error: 'Agent not found' });
    });

    test('should include version field in update response', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        name: 'Updated with Version Check',
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.json).toHaveBeenCalled();
      const updatedAgent = mockRes.json.mock.calls[0][0];

      // Verify version field is included and is a number
      expect(updatedAgent).toHaveProperty('version');
      expect(typeof updatedAgent.version).toBe('number');
      expect(updatedAgent.version).toBeGreaterThanOrEqual(1);

      // Verify in database
      const agentInDb = await Agent.findOne({ id: existingAgentId });
      expect(updatedAgent.version).toBe(agentInDb.versions.length);
    });

    test('should handle validation errors properly', async () => {
      mockReq.user.id = existingAgentAuthorId.toString();
      mockReq.params.id = existingAgentId;
      mockReq.body = {
        model_parameters: 'invalid-not-an-object', // Should be an object
      };

      await updateAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(400);
      expect(mockRes.json).toHaveBeenCalledWith(
        expect.objectContaining({
          error: 'Invalid request data',
          details: expect.any(Array),
        }),
      );
    });
  });

  describe('Mass Assignment Attack Scenarios', () => {
    test('should prevent setting system fields during creation', async () => {
      const systemFields = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'System Fields Test',

        // System fields that should never be settable by users
        __v: 99,
        _id: new mongoose.Types.ObjectId(),
        versions: [
          {
            name: 'Fake Version',
            provider: 'fake',
            model: 'fake-model',
          },
        ],
      };

      mockReq.body = systemFields;

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];

      // Verify system fields were not affected
      expect(createdAgent.__v).not.toBe(99);
      expect(createdAgent.versions).toHaveLength(1); // Should only have the auto-created version
      expect(createdAgent.versions[0].name).toBe('System Fields Test'); // From actual creation
      expect(createdAgent.versions[0].provider).toBe('openai'); // From actual creation

      // Verify in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id });
      expect(agentInDb.__v).not.toBe(99);
    });

    test('should prevent author hijacking', async () => {
      const originalAuthorId = new mongoose.Types.ObjectId();
      const attackerId = new mongoose.Types.ObjectId();

      // Admin creates an agent
      mockReq.user.id = originalAuthorId.toString();
      mockReq.user.role = 'ADMIN';
      mockReq.body = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Admin Agent',
        author: attackerId.toString(), // Trying to set different author
      };

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];

      // Author should be the actual user, not the attempted value
      expect(createdAgent.author.toString()).toBe(originalAuthorId.toString());
      expect(createdAgent.author.toString()).not.toBe(attackerId.toString());

      // Verify in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id });
      expect(agentInDb.author.toString()).toBe(originalAuthorId.toString());
    });

    test('should strip unknown fields to prevent future vulnerabilities', async () => {
      mockReq.body = {
        provider: 'openai',
        model: 'gpt-4',
        name: 'Future Proof Test',

        // Unknown fields that might be added in future
        superAdminAccess: true,
        bypassAllChecks: true,
        internalFlag: 'secret',
        futureFeature: 'exploit',
      };

      await createAgentHandler(mockReq, mockRes);

      expect(mockRes.status).toHaveBeenCalledWith(201);

      const createdAgent = mockRes.json.mock.calls[0][0];

      // Verify unknown fields were stripped
      expect(createdAgent.superAdminAccess).toBeUndefined();
      expect(createdAgent.bypassAllChecks).toBeUndefined();
      expect(createdAgent.internalFlag).toBeUndefined();
      expect(createdAgent.futureFeature).toBeUndefined();

      // Also check in database
      const agentInDb = await Agent.findOne({ id: createdAgent.id }).lean();
      expect(agentInDb.superAdminAccess).toBeUndefined();
      expect(agentInDb.bypassAllChecks).toBeUndefined();
      expect(agentInDb.internalFlag).toBeUndefined();
      expect(agentInDb.futureFeature).toBeUndefined();
    });
  });
});