// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========= Copyright 2025-2026 @ Eigent.ai All Rights Reserved. =========

import { beforeEach, describe, expect, it, Mock, vi } from 'vitest';
// Mock modules with inline factories to avoid vitest hoisting issues.
vi.mock('electron', () => {
  const dialogMocks = {
    showOpenDialog: vi.fn(),
    showSaveDialog: vi.fn(),
  };
  return { dialog: dialogMocks };
});

vi.mock('node:fs', () => {
  const fsMocks = {
    existsSync: vi.fn(),
    readFileSync: vi.fn(),
    writeFileSync: vi.fn(),
    createReadStream: vi.fn(),
    mkdirSync: vi.fn(),
  };
  return {
    default: fsMocks,
    existsSync: fsMocks.existsSync,
    readFileSync: fsMocks.readFileSync,
    writeFileSync: fsMocks.writeFileSync,
    createReadStream: fsMocks.createReadStream,
    mkdirSync: fsMocks.mkdirSync,
  };
});

vi.mock('fs/promises', () => ({
  readFile: vi.fn(),
  writeFile: vi.fn(),
  stat: vi.fn(),
  rm: vi.fn(),
}));

import { dialog } from 'electron';
import * as fsp from 'fs/promises';
import fs from 'node:fs';
import path from 'node:path';

describe('File Operations and Utilities', () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe('select-file IPC handler', () => {
    it('should handle successful file selection', async () => {
      const mockResult = {
        canceled: false,
        filePaths: ['/path/to/file1.txt', '/path/to/file2.pdf'],
      };

      (dialog.showOpenDialog as Mock).mockResolvedValue(mockResult);

      const result = await dialog.showOpenDialog({} as any, {
        properties: ['openFile', 'multiSelections'],
      });

      expect(result.canceled).toBe(false);
      expect(result.filePaths).toHaveLength(2);
      expect(result.filePaths[0]).toContain('.txt');
      expect(result.filePaths[1]).toContain('.pdf');
    });

    it('should handle cancelled file selection', async () => {
      const mockResult = {
        canceled: true,
        filePaths: [],
      };

      (dialog.showOpenDialog as Mock).mockResolvedValue(mockResult);

      const result = await dialog.showOpenDialog({} as any, {
        properties: ['openFile', 'multiSelections'],
      });

      expect(result.canceled).toBe(true);
      expect(result.filePaths).toHaveLength(0);
    });

    it('should handle file selection with filters', async () => {
      const options = {
        properties: ['openFile'] as const,
        filters: [
          { name: 'Text Files', extensions: ['txt', 'md'] },
          { name: 'PDF Files', extensions: ['pdf'] },
          { name: 'All Files', extensions: ['*'] },
        ],
      };

      expect(options.filters).toHaveLength(3);
      expect(options.filters[0].extensions).toContain('txt');
      expect(options.filters[1].extensions).toContain('pdf');
    });

    it('should process successful file selection result', () => {
      const result = {
        canceled: false,
        filePaths: ['/path/to/selected/file.txt'],
      };

      if (!result.canceled && result.filePaths.length > 0) {
        const firstFile = result.filePaths[0];
        const fileName = path.basename(firstFile);
        const fileExt = path.extname(firstFile);

        expect(fileName).toBe('file.txt');
        expect(fileExt).toBe('.txt');
      }
    });
  });

  describe('read-file IPC handler', () => {
    it('should successfully read file content', async () => {
      const mockContent = 'This is the file content\nWith multiple lines';
      (fsp.readFile as Mock).mockResolvedValue(mockContent);

      const content = await fsp.readFile('/path/to/file.txt', 'utf-8');

      expect(content).toBe(mockContent);
      expect(content).toContain('multiple lines');
    });

    it('should handle file read errors', async () => {
      const error = new Error('ENOENT: no such file or directory');
      (fsp.readFile as Mock).mockRejectedValue(error);

      try {
        await fsp.readFile('/nonexistent/file.txt', 'utf-8');
      } catch (e) {
        expect(e).toBeInstanceOf(Error);
        expect((e as Error).message).toContain('no such file or directory');
      }
    });

    it('should handle different file encodings', async () => {
      const mockContent = Buffer.from('Binary content');
      (fsp.readFile as Mock).mockResolvedValue(mockContent);

      const content = await fsp.readFile('/path/to/binary.bin');

      expect(Buffer.isBuffer(content)).toBe(true);
    });

    it('should validate file path', () => {
      const filePath = path.normalize('/path/to/file.txt');
      const isAbsolute = path.isAbsolute(filePath);
      const normalizedPath = path.normalize(filePath);

      expect(isAbsolute).toBe(true);
      expect(normalizedPath).toBe(filePath);
    });
  });

  describe('reveal-in-folder IPC handler', () => {
    it('should handle valid file path', () => {
      const filePath = '/Users/test/Documents/file.txt';
      const isValid = path.isAbsolute(filePath) && filePath.length > 0;

      expect(isValid).toBe(true);
    });

    it('should handle invalid file path', () => {
      const filePath = '';
      const isValid = path.isAbsolute(filePath) && filePath.length > 0;

      expect(isValid).toBe(false);
    });

    it('should normalize file path', () => {
      const filePath = '/Users/test/../test/Documents/./file.txt';
      const normalized = path.normalize(filePath);

      expect(normalized).toBe(path.normalize('/Users/test/Documents/file.txt'));
    });

    it('should extract directory from file path', () => {
      const filePath = '/Users/test/Documents/file.txt';
      const directory = path.dirname(filePath);

      expect(path.normalize(directory)).toBe(
        path.normalize('/Users/test/Documents')
      );
    });
  });

  describe('File System Utilities', () => {
    it('should check file existence', () => {
      (fs.existsSync as Mock).mockReturnValue(true);

      const exists = fs.existsSync('/path/to/file.txt');
      expect(exists).toBe(true);
    });

    it('should handle non-existent files', () => {
      (fs.existsSync as Mock).mockReturnValue(false);

      const exists = fs.existsSync('/path/to/nonexistent.txt');
      expect(exists).toBe(false);
    });

    it('should create directory path', () => {
      const dirPath = '/path/to/new/directory';
      const mockMkdirSync = vi.fn();
      vi.mocked(fs).mkdirSync = mockMkdirSync;

      fs.mkdirSync(dirPath, { recursive: true });

      expect(mockMkdirSync).toHaveBeenCalledWith(dirPath, { recursive: true });
    });

    it('should handle path operations', () => {
      const filePath = '/Users/test/Documents/file.txt';

      const basename = path.basename(filePath);
      const dirname = path.dirname(filePath);
      const extname = path.extname(filePath);
      const parsed = path.parse(filePath);

      expect(basename).toBe('file.txt');
      expect(path.normalize(dirname)).toBe(
        path.normalize('/Users/test/Documents')
      );
      expect(extname).toBe('.txt');
      expect(parsed.name).toBe('file');
      expect(parsed.ext).toBe('.txt');
    });
  });

  describe('File Validation', () => {
    it('should validate file extension', () => {
      const allowedExtensions = ['.txt', '.md', '.json', '.pdf'];
      const filePath = '/path/to/document.pdf';
      const fileExt = path.extname(filePath);

      const isAllowed = allowedExtensions.includes(fileExt);
      expect(isAllowed).toBe(true);
    });

    it('should reject invalid file extension', () => {
      const allowedExtensions = ['.txt', '.md', '.json'];
      const filePath = '/path/to/executable.exe';
      const fileExt = path.extname(filePath);

      const isAllowed = allowedExtensions.includes(fileExt);
      expect(isAllowed).toBe(false);
    });

    it('should validate file size', () => {
      const maxSize = 10 * 1024 * 1024; // 10MB
      const mockStats = { size: 5 * 1024 * 1024 }; // 5MB

      const isValidSize = mockStats.size <= maxSize;
      expect(isValidSize).toBe(true);
    });

    it('should reject files that are too large', () => {
      const maxSize = 10 * 1024 * 1024; // 10MB
      const mockStats = { size: 20 * 1024 * 1024 }; // 20MB

      const isValidSize = mockStats.size <= maxSize;
      expect(isValidSize).toBe(false);
    });
  });

  describe('File Content Processing', () => {
    it('should process text file content', () => {
      const content = 'Line 1\nLine 2\nLine 3';
      const lines = content.split('\n');

      expect(lines).toHaveLength(3);
      expect(lines[0]).toBe('Line 1');
      expect(lines[2]).toBe('Line 3');
    });

    it('should handle empty file content', () => {
      const content = '';
      const lines = content.split('\n');

      expect(lines).toHaveLength(1);
      expect(lines[0]).toBe('');
    });

    it('should process CSV-like content', () => {
      const content =
        'name,age,email\nJohn,30,john@example.com\nJane,25,jane@example.com';
      const lines = content.split('\n');
      const headers = lines[0].split(',');

      expect(headers).toEqual(['name', 'age', 'email']);
      expect(lines).toHaveLength(3);
    });

    it('should handle binary file detection', () => {
      const textContent = 'This is regular text content';
      const binaryContent = Buffer.from([0x00, 0x01, 0x02, 0xff]);

      const isText = typeof textContent === 'string';
      const isBinary = Buffer.isBuffer(binaryContent);

      expect(isText).toBe(true);
      expect(isBinary).toBe(true);
    });
  });

  describe('File Stream Operations', () => {
    it('should create readable stream', () => {
      const mockCreateReadStream = vi.fn().mockReturnValue({
        pipe: vi.fn(),
        on: vi.fn(),
        destroy: vi.fn(),
      });

      vi.mocked(fs).createReadStream = mockCreateReadStream;

      const stream = fs.createReadStream('/path/to/file.txt');

      expect(mockCreateReadStream).toHaveBeenCalledWith('/path/to/file.txt');
      expect(stream.pipe).toBeDefined();
      expect(stream.on).toBeDefined();
    });

    it('should handle stream errors', () => {
      const mockStream = {
        on: vi.fn((event, callback) => {
          if (event === 'error') {
            setTimeout(() => callback(new Error('Stream error')), 0);
          }
        }),
        destroy: vi.fn(),
      };

      let errorReceived = false;
      mockStream.on('error', (error: Error) => {
        errorReceived = true;
        expect(error.message).toBe('Stream error');
      });

      setTimeout(() => {
        expect(errorReceived).toBe(true);
      }, 10);
    });

    it('should cleanup stream resources', () => {
      const mockStream = {
        destroy: vi.fn(),
        on: vi.fn(),
      };

      // Simulate cleanup
      if (mockStream && typeof mockStream.destroy === 'function') {
        mockStream.destroy();
      }

      expect(mockStream.destroy).toHaveBeenCalled();
    });
  });

  describe('Project Management', () => {
    beforeEach(() => {
      vi.clearAllMocks();
    });

    describe('Project Structure Creation', () => {
      it('should create project directory structure', () => {
        const _email = 'test@example.com';
        const projectId = 'xyz123';
        const expectedPath = '/home/test/eigent/test/project_xyz123';

        (fs.existsSync as Mock).mockReturnValue(false);
        (fs.mkdirSync as Mock).mockImplementation(() => {});

        // Mock path operations
        const mockPath = {
          join: vi.fn((...args) => args.join('/')),
        };

        const result = mockPath.join(
          '/home',
          'test',
          'eigent',
          'test',
          `project_${projectId}`
        );
        expect(result).toBe(expectedPath);
      });

      it('should handle existing project directory', () => {
        const _email = 'test@example.com';
        const _projectId = 'existing123';

        (fs.existsSync as Mock).mockReturnValue(true);
        const mockMkdirSync = vi.fn();
        vi.mocked(fs).mkdirSync = mockMkdirSync;

        // Should not create directory if it exists
        if (!fs.existsSync('/path/to/project')) {
          fs.mkdirSync('/path/to/project', { recursive: true });
        }

        expect(mockMkdirSync).not.toHaveBeenCalled();
      });

      it('should validate project ID format', () => {
        const validProjectIds = ['xyz123', 'project_1', 'test-project'];
        const invalidProjectIds = [
          '',
          'project with spaces',
          'project/with/slashes',
        ];

        validProjectIds.forEach((id) => {
          const isValid = /^[a-zA-Z0-9_-]+$/.test(id);
          expect(isValid).toBe(true);
        });

        invalidProjectIds.forEach((id) => {
          const isValid = /^[a-zA-Z0-9_-]+$/.test(id) && id.length > 0;
          expect(isValid).toBe(false);
        });
      });
    });

    describe('Project-based Task Organization', () => {
      it('should find task in project structure', () => {
        const taskId = '1760964010356-4844';
        const projectStructure = {
          project_xyz: {
            [`task_${taskId}`]: true,
          },
          project_abc: {
            task_other: true,
          },
        };

        // Simulate finding task in project_xyz
        const foundInProject =
          'project_xyz' in projectStructure &&
          `task_${taskId}` in projectStructure['project_xyz'];

        expect(foundInProject).toBe(true);
      });

      it('should fall back to legacy structure when task not found in projects', () => {
        const taskId = 'legacy-task-123';
        const hasProjectStructure = false;

        if (!hasProjectStructure) {
          // Should look in legacy location
          const legacyPath = `/home/user/eigent/user/task_${taskId}`;
          expect(legacyPath).toContain('task_legacy-task-123');
        }
      });

      it('should handle task lookup with project ID provided', () => {
        const taskId = 'task123';
        const projectId = 'xyz';

        const projectBasedPath = `/home/user/eigent/user/project_${projectId}/task_${taskId}`;
        expect(projectBasedPath).toBe(
          '/home/user/eigent/user/project_xyz/task_task123'
        );
      });
    });

    describe('Task Migration', () => {
      it('should move task from legacy to project structure', () => {
        const taskId = '1760964010356-4844';
        const projectId = 'xyz';

        const sourcePath = `/home/user/eigent/user/task_${taskId}`;
        const destPath = `/home/user/eigent/user/project_${projectId}/task_${taskId}`;

        (fs.existsSync as Mock).mockImplementation((path: string) => {
          return path === sourcePath;
        });

        const mockRenameSync = vi.fn();
        const mockMkdirSync = vi.fn();
        vi.mocked(fs).renameSync = mockRenameSync;
        vi.mocked(fs).mkdirSync = mockMkdirSync;

        // Simulate move operation
        if (fs.existsSync(sourcePath)) {
          const projectDir = `/home/user/eigent/user/project_${projectId}`;
          if (!fs.existsSync(projectDir)) {
            mockMkdirSync(projectDir, { recursive: true });
          }
          mockRenameSync(sourcePath, destPath);
        }

        expect(mockMkdirSync).toHaveBeenCalledWith(
          `/home/user/eigent/user/project_${projectId}`,
          { recursive: true }
        );
        expect(mockRenameSync).toHaveBeenCalledWith(sourcePath, destPath);
      });

      it('should handle log files during task migration', () => {
        const taskId = 'test123';
        const projectId = 'xyz';

        const sourceLogPath = `/home/.eigent/user/task_${taskId}`;
        const destLogPath = `/home/.eigent/user/project_${projectId}/task_${taskId}`;

        (fs.existsSync as Mock).mockReturnValue(true);
        const mockRenameSync = vi.fn();
        const mockMkdirSync = vi.fn();
        vi.mocked(fs).renameSync = mockRenameSync;
        vi.mocked(fs).mkdirSync = mockMkdirSync;

        // Simulate log migration
        const destLogDir = `/home/.eigent/user/project_${projectId}`;
        mockMkdirSync(destLogDir, { recursive: true });
        mockRenameSync(sourceLogPath, destLogPath);

        expect(mockMkdirSync).toHaveBeenCalledWith(destLogDir, {
          recursive: true,
        });
        expect(mockRenameSync).toHaveBeenCalledWith(sourceLogPath, destLogPath);
      });

      it('should handle missing source files gracefully', () => {
        const taskId = 'nonexistent123';
        const _projectId = 'xyz';

        (fs.existsSync as Mock).mockReturnValue(false);
        const mockRenameSync = vi.fn();
        vi.mocked(fs).renameSync = mockRenameSync;

        // Should not attempt to move non-existent files
        const sourcePath = `/home/user/eigent/user/task_${taskId}`;
        if (fs.existsSync(sourcePath)) {
          fs.renameSync(sourcePath, '/dest/path');
        }

        expect(mockRenameSync).not.toHaveBeenCalled();
      });
    });

    describe('Project Listing and Statistics', () => {
      it('should list all projects with task counts', () => {
        const mockProjects = [
          {
            id: 'xyz',
            name: 'Project xyz',
            path: '/home/eigent/user/project_xyz',
            taskCount: 5,
            createdAt: new Date('2025-10-20'),
          },
          {
            id: 'abc',
            name: 'Project abc',
            path: '/home/eigent/user/project_abc',
            taskCount: 3,
            createdAt: new Date('2025-10-19'),
          },
        ];

        // Sort by creation date (newest first)
        const sortedProjects = mockProjects.sort(
          (a, b) => b.createdAt.getTime() - a.createdAt.getTime()
        );

        expect(sortedProjects[0].id).toBe('xyz');
        expect(sortedProjects[0].taskCount).toBe(5);
        expect(sortedProjects[1].id).toBe('abc');
      });

      it('should count tasks in project correctly', () => {
        const mockProjectContents = [
          'task_1760964010356-4844',
          'task_1760960521025-5106',
          'task_1760913987942-682',
          'other_file.txt',
          'readme.md',
        ];

        const taskCount = mockProjectContents.filter((item) =>
          item.startsWith('task_')
        ).length;

        expect(taskCount).toBe(3);
      });

      it('should handle empty projects', () => {
        const emptyProjectContents: string[] = [];
        const taskCount = emptyProjectContents.filter((item) =>
          item.startsWith('task_')
        ).length;

        expect(taskCount).toBe(0);
      });
    });

    describe('Backward Compatibility', () => {
      it('should support legacy getFileList calls without projectId', () => {
        const email = 'test@example.com';
        const taskId = 'legacy123';

        // Should work with 2 parameters (legacy)
        const legacyCall = {
          email,
          taskId,
          projectId: undefined,
        };

        expect(legacyCall.projectId).toBeUndefined();
        expect(legacyCall.email).toBe(email);
        expect(legacyCall.taskId).toBe(taskId);
      });

      it('should support new getFileList calls with projectId', () => {
        const email = 'test@example.com';
        const taskId = 'new123';
        const projectId = 'xyz';

        // Should work with 3 parameters (new)
        const newCall = {
          email,
          taskId,
          projectId,
        };

        expect(newCall.projectId).toBe(projectId);
        expect(newCall.email).toBe(email);
        expect(newCall.taskId).toBe(taskId);
      });

      it('should maintain existing directory structure for legacy tasks', () => {
        const _email = 'test@example.com';
        const taskId = 'existing123';

        const legacyPath = `/home/eigent/test/task_${taskId}`;

        // Should still be able to access legacy paths
        expect(legacyPath).toBe('/home/eigent/test/task_existing123');
      });

      it('should handle mixed legacy and project-based structures', () => {
        const userDirectoryContents = [
          'task_legacy1', // Legacy task
          'task_legacy2', // Legacy task
          'project_xyz', // New project
          'project_abc', // New project
          'other_folder', // Other content
        ];

        const legacyTasks = userDirectoryContents.filter((item) =>
          item.startsWith('task_')
        );
        const projects = userDirectoryContents.filter((item) =>
          item.startsWith('project_')
        );

        expect(legacyTasks).toHaveLength(2);
        expect(projects).toHaveLength(2);
      });
    });

    describe('Project File Listing', () => {
      it('should list all files in a project across all tasks', () => {
        const _projectStructure = {
          task_123: {
            'file1.txt': true,
            subfolder: {
              'file2.js': true,
            },
          },
          task_456: {
            'file3.py': true,
            'data.json': true,
          },
          task_789: {
            'readme.md': true,
          },
        };

        const expectedFiles = [
          {
            path: '/project/task_123/file1.txt',
            task_id: '123',
            project_id: 'xyz',
          },
          {
            path: '/project/task_123/subfolder/file2.js',
            task_id: '123',
            project_id: 'xyz',
          },
          {
            path: '/project/task_456/file3.py',
            task_id: '456',
            project_id: 'xyz',
          },
          {
            path: '/project/task_456/data.json',
            task_id: '456',
            project_id: 'xyz',
          },
          {
            path: '/project/task_789/readme.md',
            task_id: '789',
            project_id: 'xyz',
          },
        ];

        // Should return sorted list by task_id then by file path
        const sortedFiles = expectedFiles.sort((a, b) => {
          if (a.task_id !== b.task_id) {
            return a.task_id.localeCompare(b.task_id);
          }
          return a.path.localeCompare(b.path);
        });

        expect(sortedFiles[0].task_id).toBe('123');
        expect(sortedFiles[sortedFiles.length - 1].task_id).toBe('789');
      });

      it('should handle empty project directories', () => {
        const emptyProjectContents: string[] = [];
        const taskDirs = emptyProjectContents.filter((entry) =>
          entry.startsWith('task_')
        );

        expect(taskDirs).toHaveLength(0);
      });

      it('should enrich files with task and project context', () => {
        const mockFile = {
          name: 'test.txt',
          type: 'txt',
          path: '/project/task_123/test.txt',
          isFolder: false,
          relativePath: '',
        };

        const enrichedFile = {
          ...mockFile,
          task_id: '123',
          project_id: 'xyz',
          relativePath: 'task_123/test.txt',
        };

        expect(enrichedFile.task_id).toBe('123');
        expect(enrichedFile.project_id).toBe('xyz');
        expect(enrichedFile.relativePath).toBe('task_123/test.txt');
      });

      it('should filter non-task directories', () => {
        const projectContents = [
          'task_123',
          'task_456',
          'not_a_task',
          'another_folder',
          'task_789',
        ];

        const taskDirs = projectContents.filter((entry) =>
          entry.startsWith('task_')
        );

        expect(taskDirs).toHaveLength(3);
        expect(taskDirs).toContain('task_123');
        expect(taskDirs).toContain('task_456');
        expect(taskDirs).toContain('task_789');
        expect(taskDirs).not.toContain('not_a_task');
      });

      it('should handle projects with mixed file types', () => {
        const fileTypes = [
          { name: 'document.pdf', type: 'pdf' },
          { name: 'script.py', type: 'py' },
          { name: 'data.json', type: 'json' },
          { name: 'image.png', type: 'png' },
          { name: 'folder', type: 'folder', isFolder: true },
        ];

        fileTypes.forEach((file) => {
          if (file.isFolder) {
            expect(file.type).toBe('folder');
          } else {
            expect(file.type).toBe(file.name.split('.').pop());
          }
        });
      });

      it('should sort files by task ID then by path', () => {
        const unsortedFiles = [
          { task_id: '789', path: '/project/task_789/a.txt' },
          { task_id: '123', path: '/project/task_123/z.txt' },
          { task_id: '456', path: '/project/task_456/m.txt' },
          { task_id: '123', path: '/project/task_123/a.txt' },
        ];

        const sortedFiles = unsortedFiles.sort((a, b) => {
          if (a.task_id !== b.task_id) {
            return a.task_id.localeCompare(b.task_id);
          }
          return a.path.localeCompare(b.path);
        });

        expect(sortedFiles[0].task_id).toBe('123');
        expect(sortedFiles[0].path).toContain('a.txt');
        expect(sortedFiles[1].task_id).toBe('123');
        expect(sortedFiles[1].path).toContain('z.txt');
        expect(sortedFiles[2].task_id).toBe('456');
        expect(sortedFiles[3].task_id).toBe('789');
      });
    });

    describe('Error Handling', () => {
      it('should handle file system errors gracefully', () => {
        const mockReaddirSync = vi.fn().mockImplementation(() => {
          throw new Error('Permission denied');
        });
        vi.mocked(fs).readdirSync = mockReaddirSync;

        let errorOccurred = false;
        try {
          fs.readdirSync('/restricted/path');
        } catch (error) {
          errorOccurred = true;
          expect(error).toBeInstanceOf(Error);
        }

        expect(errorOccurred).toBe(true);
      });

      it('should handle invalid email addresses', () => {
        const invalidEmails = ['', 'invalid', 'test@', '@domain.com'];

        invalidEmails.forEach((email) => {
          const safeEmail = email
            .split('@')[0]
            .replace(/[\\/*?:"<>|\s]/g, '_')
            .replace(/^\.+|\.+$/g, '');
          // Should either be empty or sanitized
          expect(
            safeEmail.length === 0 || /^[a-zA-Z0-9_]+$/.test(safeEmail)
          ).toBe(true);
        });
      });

      it('should handle invalid project/task IDs', () => {
        const invalidIds = [
          '',
          'id with spaces',
          'id/with/slashes',
          'id:with:colons',
        ];

        invalidIds.forEach((id) => {
          const isValid = /^[a-zA-Z0-9_-]+$/.test(id) && id.length > 0;
          expect(isValid).toBe(false);
        });
      });

      it('should handle non-existent project directories', () => {
        (fs.existsSync as Mock).mockReturnValue(false);

        const projectExists = fs.existsSync('/nonexistent/project');
        expect(projectExists).toBe(false);

        // Should return empty array for non-existent projects
        const result: any[] = [];
        expect(result).toHaveLength(0);
      });

      it('should handle corrupted project structures', () => {
        const mockStats = vi.fn();
        mockStats.mockImplementation((path: string) => {
          if (path.includes('corrupted')) {
            throw new Error('EACCES: permission denied');
          }
          return { isDirectory: () => true };
        });

        (fs.statSync as Mock) = mockStats;

        let errorOccurred = false;
        try {
          fs.statSync('/corrupted/path');
        } catch (error) {
          errorOccurred = true;
          expect(error).toBeInstanceOf(Error);
        }

        expect(errorOccurred).toBe(true);
      });
    });
  });
});