// @vitest-environment node
import { ModelProvider } from 'model-bank';
import { beforeEach, describe, expect, it, vi } from 'vitest';

import { testProvider } from '../../providerTestUtils';
import { LobeCerebrasAI, params } from './index';

testProvider({
  Runtime: LobeCerebrasAI,
  bizErrorType: 'ProviderBizError',
  chatDebugEnv: 'DEBUG_CEREBRAS_CHAT_COMPLETION',
  chatModel: 'llama3.1-8b',
  defaultBaseURL: 'https://api.cerebras.ai/v1',
  invalidErrorType: 'InvalidProviderAPIKey',
  provider: ModelProvider.Cerebras,
  test: {
    skipAPICall: true,
    skipErrorHandle: true,
  },
});

describe('LobeCerebrasAI - custom features', () => {
  let instance: InstanceType<typeof LobeCerebrasAI>;

  beforeEach(() => {
    instance = new LobeCerebrasAI({ apiKey: 'test_api_key' });
    vi.spyOn(instance['client'].chat.completions, 'create').mockResolvedValue(
      new ReadableStream() as any,
    );
  });

  describe('params configuration', () => {
    it('should export params object with correct baseURL', () => {
      expect(params.baseURL).toBe('https://api.cerebras.ai/v1');
    });

    it('should export params with correct provider', () => {
      expect(params.provider).toBe(ModelProvider.Cerebras);
    });

    it('should have chatCompletion handlePayload function', () => {
      expect(params.chatCompletion?.handlePayload).toBeDefined();
      expect(typeof params.chatCompletion?.handlePayload).toBe('function');
    });

    it('should have debug configuration', () => {
      expect(params.debug).toBeDefined();
      expect(params.debug.chatCompletion).toBeDefined();
      expect(typeof params.debug.chatCompletion).toBe('function');
    });

    it('should have models function', () => {
      expect(params.models).toBeDefined();
      expect(typeof params.models).toBe('function');
    });
  });

  describe('debug configuration', () => {
    it('should disable debug by default', () => {
      delete process.env.DEBUG_CEREBRAS_CHAT_COMPLETION;
      const result = params.debug.chatCompletion();
      expect(result).toBe(false);
    });

    it('should enable debug when env is set to 1', () => {
      process.env.DEBUG_CEREBRAS_CHAT_COMPLETION = '1';
      const result = params.debug.chatCompletion();
      expect(result).toBe(true);
    });

    it('should disable debug when env is set to 0', () => {
      process.env.DEBUG_CEREBRAS_CHAT_COMPLETION = '0';
      const result = params.debug.chatCompletion();
      expect(result).toBe(false);
    });

    it('should disable debug when env is empty string', () => {
      process.env.DEBUG_CEREBRAS_CHAT_COMPLETION = '';
      const result = params.debug.chatCompletion();
      expect(result).toBe(false);
    });
  });

  describe('handlePayload', () => {
    it('should remove frequency_penalty and presence_penalty from payload', async () => {
      await instance.chat({
        frequency_penalty: 0.5,
        messages: [{ content: 'Hello', role: 'user' }],
        model: 'llama3.1-8b',
        presence_penalty: 0.5,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
      expect(calledPayload.model).toBe('llama3.1-8b');
    });

    it('should preserve model in the payload', async () => {
      await instance.chat({
        frequency_penalty: 0.5,
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-70b',
        presence_penalty: 0.5,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.model).toBe('llama3.1-70b');
    });

    it('should preserve other payload properties', async () => {
      await instance.chat({
        frequency_penalty: 0.5,
        max_tokens: 1000,
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
        presence_penalty: 0.5,
        stream: true,
        temperature: 0.8,
        top_p: 0.9,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.temperature).toBe(0.8);
      expect(calledPayload.max_tokens).toBe(1000);
      expect(calledPayload.top_p).toBe(0.9);
      expect(calledPayload.stream).toBe(true);
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
    });

    it('should handle payload without frequency_penalty and presence_penalty', async () => {
      await instance.chat({
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
        temperature: 0.7,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.model).toBe('llama3.1-8b');
      expect(calledPayload.temperature).toBe(0.7);
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
    });

    it('should handle payload with only frequency_penalty', async () => {
      await instance.chat({
        frequency_penalty: 0.5,
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
    });

    it('should handle payload with only presence_penalty', async () => {
      await instance.chat({
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
        presence_penalty: 0.5,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
    });

    it('should handle payload with zero values for penalties', async () => {
      await instance.chat({
        frequency_penalty: 0,
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
        presence_penalty: 0,
      });

      const calledPayload = (instance['client'].chat.completions.create as any).mock.calls[0][0];
      expect(calledPayload.frequency_penalty).toBeUndefined();
      expect(calledPayload.presence_penalty).toBeUndefined();
    });

    it('should call handlePayload directly and verify transformation', () => {
      const payload = {
        frequency_penalty: 0.5,
        max_tokens: 100,
        messages: [{ content: 'Test', role: 'user' }],
        model: 'llama3.1-8b',
        presence_penalty: 0.5,
        temperature: 0.7,
      };

      const transformedPayload = params.chatCompletion!.handlePayload!(payload as any);

      expect(transformedPayload.model).toBe('llama3.1-8b');
      expect(transformedPayload.temperature).toBe(0.7);
      expect(transformedPayload.max_tokens).toBe(100);
      expect(transformedPayload.frequency_penalty).toBeUndefined();
      expect(transformedPayload.presence_penalty).toBeUndefined();
    });
  });

  describe('models function', () => {
    it('should fetch and process models with data property', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue({
            data: [
              { id: 'llama3.1-8b', object: 'model', owned_by: 'cerebras' },
              { id: 'llama3.1-70b', object: 'model', owned_by: 'cerebras' },
            ],
          }),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
    });

    it('should handle models list without data property (direct array)', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue([
            { id: 'llama3.1-8b', object: 'model', owned_by: 'cerebras' },
            { id: 'llama3.1-70b', object: 'model', owned_by: 'cerebras' },
          ]),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
    });

    it('should handle empty models list with data property', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue({
            data: [],
          }),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
    });

    it('should handle empty models list without data property', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue([]),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
    });

    it('should handle null response', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue(null),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
    });

    it('should handle undefined response', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue(undefined),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
    });

    it('should handle response with non-array data', async () => {
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue({
            data: 'not-an-array',
          }),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
    });

    it('should handle network error and return empty array', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockRejectedValue(new Error('Network error')),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
      expect(models).toHaveLength(0);
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Failed to fetch Cerebras models. Please ensure your Cerebras API key is valid:',
        expect.any(Error),
      );

      consoleWarnSpy.mockRestore();
    });

    it('should handle API authentication error and return empty array', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const mockClient = {
        apiKey: 'invalid_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockRejectedValue(new Error('401 Unauthorized')),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toEqual([]);
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Failed to fetch Cerebras models. Please ensure your Cerebras API key is valid:',
        expect.any(Error),
      );

      consoleWarnSpy.mockRestore();
    });

    it('should handle API rate limit error and return empty array', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockRejectedValue(new Error('429 Too Many Requests')),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toEqual([]);
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Failed to fetch Cerebras models. Please ensure your Cerebras API key is valid:',
        expect.any(Error),
      );

      consoleWarnSpy.mockRestore();
    });

    it('should handle timeout error and return empty array', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockRejectedValue(new Error('Request timeout')),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(mockClient.models.list).toHaveBeenCalledTimes(1);
      expect(models).toEqual([]);
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Failed to fetch Cerebras models. Please ensure your Cerebras API key is valid:',
        expect.any(Error),
      );

      consoleWarnSpy.mockRestore();
    });

    it('should handle malformed JSON response', async () => {
      const consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockRejectedValue(new Error('Invalid JSON')),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      expect(models).toEqual([]);
      expect(consoleWarnSpy).toHaveBeenCalledWith(
        'Failed to fetch Cerebras models. Please ensure your Cerebras API key is valid:',
        expect.any(Error),
      );

      consoleWarnSpy.mockRestore();
    });

    it('should pass correct client to processMultiProviderModelList', async () => {
      const mockModelList = [
        { id: 'llama3.1-8b', object: 'model', owned_by: 'cerebras' },
        { id: 'llama3.1-70b', object: 'model', owned_by: 'cerebras' },
      ];

      const mockClient = {
        apiKey: 'test_api_key',
        baseURL: 'https://api.cerebras.ai/v1',
        models: {
          list: vi.fn().mockResolvedValue({ data: mockModelList }),
        },
      } as any;

      const models = await params.models!({ client: mockClient });

      // Verify processMultiProviderModelList was called with correct parameters
      expect(models).toBeDefined();
      expect(Array.isArray(models)).toBe(true);
    });
  });
});