import { ErrorHandler } from '../src/error-handler';
import {
  OllamaError,
  ErrorType,
  NetworkError,
  ApiError,
  ValidationError,
  StreamingError,
  ToolExecutionError,
  PathValidationError,
} from '../src/types';

// Mock Notice from Obsidian
jest.mock('obsidian', () => ({
  Notice: jest.fn(),
}));

describe('ErrorHandler', () => {
  beforeEach(() => {
    jest.clearAllMocks();
  });

  describe('handleError', () => {
    it('should handle OllamaError with user-friendly message', () => {
      const error = new NetworkError('Connection failed');
      ErrorHandler.handleError(error);
      expect(require('obsidian').Notice).toHaveBeenCalledWith(
        'Connection error. Please check if Ollama is running.'
      );
    });

    it('should handle generic Error with user-friendly message', () => {
      const error = new Error('Network timeout occurred');
      ErrorHandler.handleError(error);
      expect(require('obsidian').Notice).toHaveBeenCalledWith(
        'Request timed out. Please check your Ollama connection.'
      );
    });

    it('should handle unknown error type with generic message', () => {
      const error = 'some string error';
      ErrorHandler.handleError(error);
      expect(require('obsidian').Notice).toHaveBeenCalledWith('An unexpected error occurred');
    });

    it('should log detailed error information to console', () => {
      const error = new Error('Test error');
      const consoleSpy = jest.spyOn(console, 'error').mockImplementation(() => {});
      ErrorHandler.handleError(error);
      expect(consoleSpy).toHaveBeenCalledWith(expect.stringContaining('Test error'));
      consoleSpy.mockRestore();
    });
  });

  describe('NetworkError handling', () => {
    it('should create user-friendly message for network errors', () => {
      const error = new NetworkError('Connection failed');
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toBe('Connection error. Please check if Ollama is running.');
    });

    it('should include status code in error details', () => {
      const error = new NetworkError('Connection failed', 500);
      expect(error.statusCode).toBe(500);
    });
  });

  describe('ValidationError handling', () => {
    it('should create user-friendly message for validation errors', () => {
      const error = new ValidationError('Invalid input', {
        field: 'path',
        message: 'Path is required',
      });
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toContain('Invalid path');
    });

    it('should handle validation errors without field details', () => {
      const error = new ValidationError('Invalid input');
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toBe('Input validation error. Please correct your input.');
    });
  });

  describe('StreamingError handling', () => {
    it('should create user-friendly message for streaming errors', () => {
      const error = new StreamingError('Response too long');
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toBe('Response too long. Please try a shorter request.');
    });
  });

  describe('ToolExecutionError handling', () => {
    it('should create user-friendly message for tool errors', () => {
      const error = new ToolExecutionError('Tool failed', 'create_file');
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toContain('Tool error');
      expect(message).toContain('create_file');
    });
  });

  describe('PathValidationError handling', () => {
    it('should create user-friendly message for path errors', () => {
      const error = new PathValidationError('Invalid path', '/../test.md');
      const message = ErrorHandler['getUserFriendlyMessage'](error);
      expect(message).toContain('Invalid file path');
    });
  });

  describe('Error creation methods', () => {
    it('should create NetworkError with proper type', () => {
      const error = ErrorHandler.createNetworkError('Connection failed');
      expect(error).toBeInstanceOf(NetworkError);
      expect(error.type).toBe(ErrorType.NETWORK_ERROR);
    });

    it('should create ApiError with proper type', () => {
      const error = ErrorHandler.createApiError('API error');
      expect(error).toBeInstanceOf(ApiError);
      expect(error.type).toBe(ErrorType.API_ERROR);
    });

    it('should create ValidationError with proper type', () => {
      const error = ErrorHandler.createValidationError('Validation failed', 'path');
      expect(error).toBeInstanceOf(ValidationError);
      expect(error.type).toBe(ErrorType.VALIDATION_ERROR);
    });

    it('should create StreamingError with proper type', () => {
      const error = ErrorHandler.createStreamingError('Streaming failed');
      expect(error).toBeInstanceOf(StreamingError);
      expect(error.type).toBe(ErrorType.STREAMING_ERROR);
    });

    it('should create ToolExecutionError with proper type', () => {
      const error = ErrorHandler.createToolExecutionError('Tool failed');
      expect(error).toBeInstanceOf(ToolExecutionError);
      expect(error.type).toBe(ErrorType.TOOL_EXECUTION_ERROR);
    });

    it('should create PathValidationError with proper type', () => {
      const error = ErrorHandler.createPathValidationError('Path invalid');
      expect(error).toBeInstanceOf(PathValidationError);
      expect(error.type).toBe(ErrorType.PATH_VALIDATION_ERROR);
    });

    it('should create UnknownError with proper type', () => {
      const error = ErrorHandler.createUnknownError('Unknown error');
      expect(error).toBeInstanceOf(OllamaError);
      expect(error.type).toBe(ErrorType.UNKNOWN_ERROR);
    });
  });

  describe('Error message detection', () => {
    it('should detect network-related errors in generic Error', () => {
      const error = new Error('Network connection failed');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('Connection error');
    });

    it('should detect timeout errors in generic Error', () => {
      const error = new Error('Request timeout occurred');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('timed out');
    });

    it('should detect validation errors in generic Error', () => {
      const error = new Error('Validation format error');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('Invalid input');
    });

    it('should detect streaming errors in generic Error', () => {
      const error = new Error('Streaming chunk error');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('Response too long');
    });

    it('should detect tool errors in generic Error', () => {
      const error = new Error('Tool function error');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('Tool error');
    });

    it('should detect path errors in generic Error', () => {
      const error = new Error('Path file error');
      const message = ErrorHandler['getUserFriendlyMessageFromError'](error);
      expect(message).toContain('Invalid file path');
    });
  });
});