import { Command } from 'commander';
import { afterEach, beforeEach, describe, expect, it, Mock, vi } from 'vitest';
import { doValidate, doValidateTarget, validateCommand } from '../../src/commands/validate';
import logger from '../../src/logger';
import { testProviderConnectivity, testProviderSession } from '../../src/node/testProvider';
import { loadApiProvider, loadApiProviders } from '../../src/providers/index';
import { getProviderFromCloud } from '../../src/util/cloud';
import { ConfigResolutionError, resolveConfigs } from '../../src/util/config/load';
import { createMockProvider, type MockApiProvider } from '../factories/provider';

import type { UnifiedConfig } from '../../src/types/index';

vi.mock('../../src/logger');
vi.mock('../../src/util/config/load', async (importOriginal) => ({
  ...(await importOriginal<typeof import('../../src/util/config/load')>()),
  resolveConfigs: vi.fn(),
}));
vi.mock('../../src/providers/index');
vi.mock('../../src/node/testProvider');
vi.mock('../../src/util/cloud');
vi.mock('../../src/telemetry', () => ({
  default: {
    record: vi.fn(),
    send: vi.fn(),
  },
}));
vi.mock('../../src/util/uuid', () => ({
  isUuid: vi.fn((str: string) => {
    // Check if the string looks like a UUID
    const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;
    return uuidRegex.test(str);
  }),
}));

describe('Validate Command Provider Tests', () => {
  let program: Command;
  const defaultConfig = {} as UnifiedConfig;
  const defaultConfigPath = 'config.yaml';

  // Mock provider objects. isHttpProvider() only checks provider.id / config.url,
  // so createMockProvider with the right id is sufficient. These must be rebuilt in
  // beforeEach because this file's afterEach calls vi.resetAllMocks(), which wipes
  // the id mock implementation.
  let mockHttpProvider: MockApiProvider;
  let mockEchoProvider: MockApiProvider;
  let mockOpenAIProvider: MockApiProvider;

  beforeEach(() => {
    program = new Command();
    vi.clearAllMocks();
    process.exitCode = 0;

    mockHttpProvider = createMockProvider({
      id: 'http://example.com',
      response: { output: 'Test response' },
    });
    mockEchoProvider = createMockProvider({
      id: 'echo',
      response: { output: 'Hello, world!' },
    });
    mockOpenAIProvider = createMockProvider({
      id: 'openai:gpt-4',
      response: { output: 'OpenAI response' },
    });
  });

  afterEach(() => {
    vi.resetAllMocks();
  });

  describe('Provider testing with -t flag (specific target)', () => {
    it('should test HTTP provider with comprehensive tests when -t flag is provided and connectivity passes', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: true,
        message: 'Connectivity test passed',
        providerResponse: { output: 'test' },
        transformedRequest: {},
      });
      vi.mocked(testProviderSession).mockResolvedValue({
        success: true,
        message: 'Session test passed',
      });

      await doValidateTarget({ target: 'http://example.com' }, defaultConfig);

      expect(loadApiProvider).toHaveBeenCalledWith(
        'http://example.com',
        expect.objectContaining({
          options: {
            config: {
              maxRetries: 1,
              headers: {
                'x-promptfoo-silent': 'true',
              },
            },
          },
        }),
      );
      expect(testProviderConnectivity).toHaveBeenCalledWith({ provider: mockHttpProvider });
      expect(testProviderSession).toHaveBeenCalledWith({
        provider: mockHttpProvider,
        options: { skipConfigValidation: true },
      });
      // Verify provider info is logged during testing
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Provider:'));
      expect(process.exitCode).toBe(0);
    });

    it('should skip session test when connectivity test fails', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: false,
        message: 'Connection failed',
        error: 'Network error',
        providerResponse: {},
        transformedRequest: {},
      });

      await doValidateTarget({ target: 'http://example.com' }, defaultConfig);

      expect(testProviderConnectivity).toHaveBeenCalledWith({ provider: mockHttpProvider });
      expect(testProviderSession).not.toHaveBeenCalled();
      // Session test is skipped when connectivity fails
      expect(logger.info).toHaveBeenCalledWith(
        expect.stringContaining('Session test (skipped - connectivity failed)'),
      );
    });

    it('should display connectivity suggestions and transformed request details', async () => {
      const mockStatelessHttpProvider = createMockProvider({
        id: 'http://example.com',
        config: { stateful: false },
      });
      vi.mocked(loadApiProvider).mockResolvedValue(mockStatelessHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: false,
        message: 'Configuration needs changes',
        providerResponse: { output: 'test' },
        transformedRequest: {
          url: 'http://example.com/api',
          method: 'POST',
        },
        analysis: {
          changes_needed: true,
          changes_needed_reason: 'Response format needs changes',
          changes_needed_suggestions: ['Add transformResponse'],
        },
      });

      await doValidateTarget({ target: 'http://example.com' }, defaultConfig);

      expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('Connectivity test'));
      expect(logger.info).toHaveBeenCalledWith(
        expect.stringContaining('Response format needs changes'),
      );
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Add transformResponse'));
      expect(logger.debug).toHaveBeenCalledWith(
        expect.stringContaining('URL: http://example.com/api'),
      );
      expect(logger.debug).toHaveBeenCalledWith(expect.stringContaining('Method: POST'));
    });

    it('should ignore malformed connectivity suggestions', async () => {
      const mockStatelessHttpProvider = createMockProvider({
        id: 'http://example.com',
        config: { stateful: false },
      });
      vi.mocked(loadApiProvider).mockResolvedValue(mockStatelessHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: false,
        message: 'Configuration needs changes',
        analysis: {
          changes_needed: true,
          changes_needed_suggestions: 'Add transformResponse' as unknown as string[],
        },
      });

      await expect(
        doValidateTarget({ target: 'http://example.com' }, defaultConfig),
      ).resolves.toBeUndefined();
    });

    it('should display the reason for a failed session test', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: true,
        message: 'Connectivity test passed',
      });
      vi.mocked(testProviderSession).mockResolvedValue({
        success: false,
        message: 'Session test failed',
        reason: 'The target did not preserve context',
      });

      await doValidateTarget({ target: 'http://example.com' }, defaultConfig);

      expect(logger.info).toHaveBeenCalledWith(
        expect.stringContaining('Reason: The target did not preserve context'),
      );
    });

    it('should skip session test when target is not stateful (stateful=false)', async () => {
      const mockNonStatefulHttpProvider = createMockProvider({
        id: 'http://example.com',
        config: { stateful: false },
      });

      vi.mocked(loadApiProvider).mockResolvedValue(mockNonStatefulHttpProvider);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: true,
        message: 'Connectivity test passed',
        providerResponse: { output: 'test' },
        transformedRequest: {},
      });

      await doValidateTarget({ target: 'http://example.com' }, defaultConfig);

      expect(testProviderConnectivity).toHaveBeenCalledWith({
        provider: mockNonStatefulHttpProvider,
      });
      expect(testProviderSession).not.toHaveBeenCalled();
      // Session test is skipped for stateless targets
      expect(logger.info).toHaveBeenCalledWith(
        expect.stringContaining('Session test (skipped - target is stateless)'),
      );
    });

    it('should test non-HTTP provider with basic connectivity only when -t flag is provided', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      expect(loadApiProvider).toHaveBeenCalledWith('echo', expect.objectContaining({}));
      expect(mockEchoProvider.callApi).toHaveBeenCalledWith('Hello, world!', expect.any(Object));
      expect(testProviderConnectivity).not.toHaveBeenCalled();
      expect(testProviderSession).not.toHaveBeenCalled();
      // Basic connectivity test logs success with checkmark symbol
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Connectivity test'));
    });

    it('should not mark an exact 100-character serialized response as truncated', async () => {
      const output = 'x'.repeat(98);
      expect(JSON.stringify(output)).toHaveLength(100);
      mockEchoProvider.callApi.mockResolvedValue({ output });
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      const responseLog = vi
        .mocked(logger.info)
        .mock.calls.find(([message]) => String(message).includes('Response:'));
      expect(responseLog?.[0]).toContain(JSON.stringify(output));
      expect(responseLog?.[0]).not.toContain('...');
    });

    it('should load cloud provider when -t flag is UUID', async () => {
      const cloudUUID = '12345678-1234-1234-1234-123456789abc';
      const mockProviderOptions = {
        id: 'openai:gpt-4',
        config: {},
      };

      vi.mocked(getProviderFromCloud).mockResolvedValue(mockProviderOptions as any);
      vi.mocked(loadApiProvider).mockResolvedValue(mockOpenAIProvider);

      await doValidateTarget({ target: cloudUUID }, defaultConfig);

      expect(getProviderFromCloud).toHaveBeenCalledWith(cloudUUID);
      expect(loadApiProvider).toHaveBeenCalledWith(
        'openai:gpt-4',
        expect.objectContaining({
          options: mockProviderOptions,
        }),
      );
      // Verify provider info is logged during testing
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Provider:'));
      expect(mockOpenAIProvider.callApi).toHaveBeenCalled();
    });
  });

  describe('Config validation without -t flag (no provider testing)', () => {
    it('should only validate config when no target is provided', async () => {
      const mockValidConfig = {
        prompts: ['test prompt'],
        providers: ['echo', 'openai:gpt-4'],
      };

      const mockValidTestSuite = {
        prompts: [{ raw: 'test prompt', label: 'test' }],
        providers: [
          createMockProvider({ id: 'echo', label: 'echo', response: {} }),
          createMockProvider({ id: 'openai:gpt-4', label: 'openai', response: {} }),
        ],
        tests: [],
      };

      vi.mocked(resolveConfigs).mockResolvedValue({
        config: mockValidConfig as any,
        testSuite: mockValidTestSuite as any,
        basePath: '/test',
      });

      await doValidate({ config: ['test-config.yaml'] }, defaultConfig, defaultConfigPath);

      // Should NOT test providers, only validate config
      expect(loadApiProviders).not.toHaveBeenCalled();
      expect(mockEchoProvider.callApi).not.toHaveBeenCalled();
      expect(mockOpenAIProvider.callApi).not.toHaveBeenCalled();

      // Should only report config validation success
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Configuration is valid'));
      expect(process.exitCode).toBe(0);
    });

    it('should validate config with empty providers list', async () => {
      const mockValidConfig = {
        prompts: ['test prompt'],
        providers: [],
      };

      const mockValidTestSuite = {
        prompts: [{ raw: 'test prompt', label: 'test' }],
        providers: [],
        tests: [],
      };

      vi.mocked(resolveConfigs).mockResolvedValue({
        config: mockValidConfig as any,
        testSuite: mockValidTestSuite as any,
        basePath: '/test',
      });

      await doValidate({ config: ['test-config.yaml'] }, defaultConfig, defaultConfigPath);

      expect(loadApiProviders).not.toHaveBeenCalled();
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Configuration is valid'));
    });
  });

  describe('Error handling in provider tests', () => {
    it('should log error and set exitCode 1 when provider test throws', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);
      (mockEchoProvider.callApi as Mock).mockRejectedValue(new Error('Connection failed'));

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      // When callApi throws, testBasicConnectivity logs the error
      expect(logger.error).toHaveBeenCalledWith(expect.stringContaining('Connectivity test'));
      expect(logger.error).toHaveBeenCalledWith(expect.stringContaining('Connection failed'));
      // Connectivity test failed, so exitCode is 1
      expect(process.exitCode).toBe(1);
    });

    it('should log error and set exitCode 1 when provider returns error response', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);
      (mockEchoProvider.callApi as Mock).mockResolvedValue({
        error: 'Provider error',
      });

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      // When result.error is set, testBasicConnectivity logs the error
      expect(logger.error).toHaveBeenCalledWith(expect.stringContaining('Connectivity test'));
      expect(logger.error).toHaveBeenCalledWith(expect.stringContaining('Provider error'));
      // Connectivity test failed, so exitCode is 1
      expect(process.exitCode).toBe(1);
    });

    it('should warn when provider returns no output', async () => {
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);
      (mockEchoProvider.callApi as Mock).mockResolvedValue({});

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      // When result has no output, testBasicConnectivity warns
      expect(logger.warn).toHaveBeenCalledWith(expect.stringContaining('Connectivity test'));
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('No output'));
      // Connectivity test failed, so exitCode is 1
      expect(process.exitCode).toBe(1);
    });

    it('should error when loadApiProvider fails with -t flag', async () => {
      vi.mocked(loadApiProvider).mockRejectedValue(new Error('Failed to load provider'));

      await doValidateTarget({ target: 'invalid-provider' }, defaultConfig);

      // When loadApiProvider fails, runProviderTests catches and logs error
      expect(logger.error).toHaveBeenCalledWith(
        expect.stringContaining('Provider tests failed: Failed to load provider'),
      );
      expect(process.exitCode).toBe(1); // Errors set exit code to 1
    });
  });

  describe('HTTP provider detection with target flag', () => {
    it('should detect HTTP provider by url in id when using target', async () => {
      const mockHttpProviderById = createMockProvider({
        id: 'http://custom-api.com',
        response: { output: 'HTTP response' },
      });

      vi.mocked(loadApiProvider).mockResolvedValue(mockHttpProviderById);
      vi.mocked(testProviderConnectivity).mockResolvedValue({
        success: true,
        message: 'Test passed',
        providerResponse: { output: 'test' },
        transformedRequest: {},
      });
      vi.mocked(testProviderSession).mockResolvedValue({
        success: true,
        message: 'Test passed',
      });

      await doValidateTarget({ target: 'http://custom-api.com' }, defaultConfig);

      // Should call HTTP-specific tests for providers with http:// id
      expect(testProviderConnectivity).toHaveBeenCalled();
      expect(testProviderSession).toHaveBeenCalled();
    });
  });

  describe('Testing without config file', () => {
    it('should test provider with -t flag when no config file is present', async () => {
      // No config paths provided
      vi.mocked(loadApiProvider).mockResolvedValue(mockEchoProvider);

      await doValidateTarget({ target: 'echo' }, defaultConfig);

      expect(loadApiProvider).toHaveBeenCalledWith('echo', expect.objectContaining({}));
      expect(mockEchoProvider.callApi).toHaveBeenCalled();
      // Verify that provider info is logged during validation
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Provider:'));
      expect(process.exitCode).toBe(0);
    });

    it('should test cloud provider with UUID when no config file is present', async () => {
      const cloudUUID = '12345678-1234-1234-1234-123456789abc';
      const mockProviderOptions = {
        id: 'openai:gpt-4',
        config: {},
      };

      vi.mocked(getProviderFromCloud).mockResolvedValue(mockProviderOptions as any);
      vi.mocked(loadApiProvider).mockResolvedValue(mockOpenAIProvider);

      await doValidateTarget({ target: cloudUUID }, defaultConfig);

      expect(getProviderFromCloud).toHaveBeenCalledWith(cloudUUID);
      expect(loadApiProvider).toHaveBeenCalledWith(
        'openai:gpt-4',
        expect.objectContaining({
          options: mockProviderOptions,
        }),
      );
      // Verify that provider info is logged during validation
      expect(logger.info).toHaveBeenCalledWith(expect.stringContaining('Provider:'));
      expect(mockOpenAIProvider.callApi).toHaveBeenCalled();
      expect(process.exitCode).toBe(0);
    });

    it('should handle errors gracefully when testing without config', async () => {
      vi.mocked(loadApiProvider).mockRejectedValue(new Error('Provider not found'));

      await doValidateTarget({ target: 'invalid-provider' }, defaultConfig);

      // The error is caught by runProviderTests which logs an error
      expect(logger.error).toHaveBeenCalledWith(
        expect.stringContaining('Provider tests failed: Provider not found'),
      );
      // Errors cause validation to fail
      expect(process.exitCode).toBe(1);
    });
  });

  describe('Target command edge cases', () => {
    it('should require either target or config', async () => {
      await doValidateTarget({}, defaultConfig);

      expect(logger.error).toHaveBeenCalledWith(
        expect.stringContaining('Please specify either -t <provider-id> or -c <config-path>'),
      );
      expect(process.exitCode).toBe(1);
      expect(loadApiProvider).not.toHaveBeenCalled();
      expect(loadApiProviders).not.toHaveBeenCalled();
    });

    it('should set exitCode 1 when loading config fails', async () => {
      vi.mocked(resolveConfigs).mockRejectedValue(new Error('Config not found'));

      await doValidateTarget({ config: 'missing.yaml' }, defaultConfig);

      expect(resolveConfigs).toHaveBeenCalledWith(
        { config: ['missing.yaml'], envPath: undefined },
        defaultConfig,
      );
      expect(logger.error).toHaveBeenCalledWith(
        expect.stringContaining('Failed to load configuration: Config not found'),
      );
      expect(process.exitCode).toBe(1);
    });

    it('should preserve config resolution warning level when loading config fails', async () => {
      vi.mocked(resolveConfigs).mockRejectedValue(
        new ConfigResolutionError('No promptfooconfig found', {
          cliMessage: 'No promptfooconfig found in this directory.',
          logLevel: 'warn',
        }),
      );

      await doValidateTarget({ config: 'missing.yaml' }, defaultConfig);

      expect(logger.warn).toHaveBeenCalledWith(
        'Failed to load configuration: No promptfooconfig found in this directory.',
      );
      expect(logger.error).not.toHaveBeenCalledWith(
        expect.stringContaining('Failed to load configuration'),
      );
      expect(process.exitCode).toBe(1);
    });

    it('should handle config mode with no providers gracefully', async () => {
      vi.mocked(resolveConfigs).mockResolvedValue({
        config: {
          providers: [],
        } as any,
        testSuite: {} as any,
        basePath: '/test',
      });

      await doValidateTarget({ config: 'empty-providers.yaml' }, defaultConfig);

      expect(resolveConfigs).toHaveBeenCalledWith(
        { config: ['empty-providers.yaml'], envPath: undefined },
        defaultConfig,
      );
      expect(loadApiProviders).not.toHaveBeenCalled();
      expect(logger.info).toHaveBeenCalledWith(
        expect.stringContaining('No providers found in configuration to test.'),
      );
      expect(process.exitCode).toBe(0);
    });
  });

  describe('Command registration', () => {
    it('should register target subcommand with -t/--target option', () => {
      validateCommand(program, defaultConfig, defaultConfigPath);

      const validateCmd = program.commands.find((cmd) => cmd.name() === 'validate');
      const targetSubCmd = validateCmd?.commands.find((cmd) => cmd.name() === 'target');

      expect(targetSubCmd).toBeDefined();

      const targetOption = targetSubCmd?.options.find((opt) => opt.long === '--target');
      expect(targetOption).toBeDefined();
      expect(targetOption?.short).toBe('-t');
      expect(targetOption?.description).toContain('Provider ID');

      const configOption = targetSubCmd?.options.find((opt) => opt.long === '--config');
      expect(configOption).toBeDefined();
      expect(configOption?.short).toBe('-c');
      expect(configOption?.description).toContain('Path to configuration file');
    });
  });
});