import { afterAll, beforeAll, beforeEach, describe, expect, it, vi } from 'vitest';
import { fetchWithCache } from '../../../src/cache';
import { VERSION } from '../../../src/constants';
import logger from '../../../src/logger';
import { getRequestTimeoutMs } from '../../../src/providers/shared';
import {
  callExtraction,
  fetchRemoteGeneration,
  formatPrompts,
  RedTeamGenerationResponse,
} from '../../../src/redteam/extraction/util';
import { getRemoteGenerationUrl } from '../../../src/redteam/remoteGeneration';
import {
  createMockProvider,
  createProviderResponse,
  type MockApiProvider,
} from '../../factories/provider';
import { mockProcessEnv } from '../../util/utils';

vi.mock('../../../src/cache', async (importOriginal) => {
  return {
    ...(await importOriginal()),
    fetchWithCache: vi.fn(),
  };
});

vi.mock('../../../src/logger', () => ({
  default: {
    debug: vi.fn(),
    info: vi.fn(),
    warn: vi.fn(),
    error: vi.fn(),
  },
  getLogLevel: vi.fn().mockReturnValue('info'),
}));

vi.mock('../../../src/redteam/remoteGeneration', async (importOriginal) => {
  return {
    ...(await importOriginal()),
    getRemoteGenerationUrl: vi.fn().mockReturnValue('https://api.promptfoo.app/api/v1/task'),
  };
});

describe('fetchRemoteGeneration', () => {
  let restoreEnv: () => void;

  beforeAll(() => {
    restoreEnv = mockProcessEnv({ PROMPTFOO_REMOTE_GENERATION_URL: undefined });
  });

  afterAll(() => {
    restoreEnv();
  });

  beforeEach(() => {
    vi.clearAllMocks();
    vi.mocked(getRemoteGenerationUrl).mockImplementation(function () {
      return 'https://api.promptfoo.app/api/v1/task';
    });
  });

  it('should fetch remote generation for purpose task', async () => {
    const mockResponse = {
      data: {
        task: 'purpose',
        result: 'This is a purpose',
      },
      status: 200,
      statusText: 'OK',
      cached: false,
    };
    vi.mocked(fetchWithCache).mockResolvedValue(mockResponse);

    const result = await fetchRemoteGeneration('purpose', ['prompt1', 'prompt2']);

    expect(result).toBe('This is a purpose');
    expect(fetchWithCache).toHaveBeenCalledWith(
      'https://api.promptfoo.app/api/v1/task',
      {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          task: 'purpose',
          prompts: ['prompt1', 'prompt2'],
          version: VERSION,
          email: null,
        }),
      },
      getRequestTimeoutMs(),
      'json',
    );
  });

  it('should fetch remote generation for entities task', async () => {
    const mockResponse = {
      data: {
        task: 'entities',
        result: ['Entity1', 'Entity2'],
      },
      status: 200,
      statusText: 'OK',
      cached: false,
    };
    vi.mocked(fetchWithCache).mockResolvedValue(mockResponse);

    const result = await fetchRemoteGeneration('entities', ['prompt1', 'prompt2']);

    expect(result).toEqual(['Entity1', 'Entity2']);
    expect(fetchWithCache).toHaveBeenCalledWith(
      'https://api.promptfoo.app/api/v1/task',
      {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          task: 'entities',
          prompts: ['prompt1', 'prompt2'],
          version: VERSION,
          email: null,
        }),
      },
      getRequestTimeoutMs(),
      'json',
    );
  });

  it('should include the resolved cloud target in the remote generation payload', async () => {
    vi.mocked(fetchWithCache).mockResolvedValue({
      data: { task: 'purpose', result: 'This is a purpose' },
      status: 200,
      statusText: 'OK',
      cached: false,
    });

    await fetchRemoteGeneration('purpose', ['prompt'], {
      providerTargetIds: ['file://local-provider.ts'],
      cloudTargetId: 'cloud-target-123',
    });

    expect(fetchWithCache).toHaveBeenCalledWith(
      'https://api.promptfoo.app/api/v1/task',
      expect.objectContaining({
        body: JSON.stringify({
          task: 'purpose',
          prompts: ['prompt'],
          version: VERSION,
          email: null,
          targetId: 'cloud-target-123',
        }),
      }),
      getRequestTimeoutMs(),
      'json',
    );
  });

  it('should throw an error when fetchWithCache fails', async () => {
    const mockError = new Error('Network error');
    vi.mocked(fetchWithCache).mockRejectedValue(mockError);

    await expect(fetchRemoteGeneration('purpose', ['prompt'])).rejects.toThrow('Network error');
    expect(logger.warn).toHaveBeenCalledWith(
      "Error using remote generation for task 'purpose': Error: Network error",
    );
  });

  it('should throw an error when response parsing fails', async () => {
    const mockResponse = {
      data: {
        task: 'purpose',
        // Missing 'result' field
      },
      status: 200,
      statusText: 'OK',
      cached: false,
    };
    vi.mocked(fetchWithCache).mockResolvedValue(mockResponse);

    await expect(fetchRemoteGeneration('purpose', ['prompt'])).rejects.toThrow('Invalid input');
    expect(logger.warn).toHaveBeenCalledWith(
      expect.stringContaining("Error using remote generation for task 'purpose':"),
    );
  });

  it('should use custom remote generation URL when provided', async () => {
    const customUrl = 'https://custom-api.example.com/generate';
    vi.mocked(getRemoteGenerationUrl).mockImplementation(function () {
      return customUrl;
    });

    const mockResponse = {
      data: {
        task: 'purpose',
        result: 'This is a purpose',
      },
      status: 200,
      statusText: 'OK',
      cached: false,
    };
    vi.mocked(fetchWithCache).mockResolvedValue(mockResponse);

    await fetchRemoteGeneration('purpose', ['prompt1']);

    expect(fetchWithCache).toHaveBeenCalledWith(
      customUrl,
      expect.any(Object),
      getRequestTimeoutMs(),
      'json',
    );
  });
});

describe('RedTeamGenerationResponse', () => {
  it('should validate correct response structure', () => {
    const validResponse = {
      task: 'purpose',
      result: 'This is a purpose',
    };

    expect(() => RedTeamGenerationResponse.parse(validResponse)).not.toThrow();
  });

  it('should throw error for invalid response structure', () => {
    const invalidResponse = {
      task: 'purpose',
      // Missing 'result' field
    };

    expect(() => RedTeamGenerationResponse.parse(invalidResponse)).toThrow('Invalid input');
  });

  it('should validate response with string result', () => {
    const response = {
      task: 'purpose',
      result: 'This is a purpose',
    };

    expect(() => RedTeamGenerationResponse.parse(response)).not.toThrow();
  });

  it('should validate response with array result', () => {
    const response = {
      task: 'entities',
      result: ['Entity1', 'Entity2'],
    };

    expect(() => RedTeamGenerationResponse.parse(response)).not.toThrow();
  });
});

describe('Extraction Utils', () => {
  let provider: MockApiProvider;

  beforeEach(() => {
    provider = createMockProvider({
      response: createProviderResponse({ output: 'test output' }),
    });
    vi.clearAllMocks();
  });

  describe('callExtraction', () => {
    it('should call API with formatted chat message and process output correctly', async () => {
      const result = await callExtraction(provider, 'test prompt', (output) =>
        output.toUpperCase(),
      );
      expect(result).toBe('TEST OUTPUT');
      expect(provider.callApi).toHaveBeenCalledWith(
        JSON.stringify([{ role: 'user', content: 'test prompt' }]),
      );
    });

    it('should throw an error if API call fails', async () => {
      const error = new Error('API error');
      vi.mocked(provider.callApi).mockResolvedValue({ error: error.message });

      await expect(callExtraction(provider, 'test prompt', vi.fn())).rejects.toThrow(
        'Failed to perform extraction: API error',
      );
    });

    it('should throw an error if output is not a string', async () => {
      vi.mocked(provider.callApi).mockResolvedValue({ output: 123 });

      await expect(callExtraction(provider, 'test prompt', vi.fn())).rejects.toThrow(
        'Invalid extraction output: expected string, got: 123',
      );
    });

    it('should handle empty string output', async () => {
      vi.mocked(provider.callApi).mockResolvedValue({ output: '' });

      const result = await callExtraction(provider, 'test prompt', (output) => output.length);
      expect(result).toBe(0);
    });

    it('should handle null output', async () => {
      vi.mocked(provider.callApi).mockResolvedValue({ output: null });

      await expect(callExtraction(provider, 'test prompt', vi.fn())).rejects.toThrow(
        'Invalid extraction output: expected string, got: null',
      );
    });

    it('should handle undefined output', async () => {
      vi.mocked(provider.callApi).mockResolvedValue({ output: undefined });

      await expect(callExtraction(provider, 'test prompt', vi.fn())).rejects.toThrow(
        'Invalid extraction output: expected string, got: undefined',
      );
    });
  });

  describe('formatPrompts', () => {
    it('should format prompts correctly', () => {
      const formattedPrompts = formatPrompts(['prompt1', 'prompt2']);
      expect(formattedPrompts).toBe('<Prompt>\nprompt1\n</Prompt>\n<Prompt>\nprompt2\n</Prompt>');
    });
  });
});