// ========= 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. =========

/**
 * Simple demonstration test for the new process utilities mocking
 * This shows how to test the functions from process.ts with our enhanced mocks
 */

import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
import {
  createElectronAppMock,
  createFileSystemMock,
  createLogMock,
  createOsMock,
  createPathMock,
  createProcessMock,
  createProcessUtilsMock,
  setupMockEnvironment,
} from '../../../mocks/environmentMocks';

// Set up vi.mock calls at the top level to avoid hoisting issues
vi.mock('fs', () => createFileSystemMock());
vi.mock('child_process', () => createProcessMock());
vi.mock('os', () => ({ default: createOsMock() }));
vi.mock('path', () => ({ default: createPathMock() }));
vi.mock('electron', () => ({
  app: createElectronAppMock(),
  BrowserWindow: vi.fn(),
}));
vi.mock('electron-log', () => ({ default: createLogMock() }));
vi.mock('../../../../electron/main/utils/process', () =>
  createProcessUtilsMock()
);

describe('Process Utils Mocking Demo', () => {
  let mockEnv: ReturnType<typeof setupMockEnvironment>;

  beforeEach(() => {
    mockEnv = setupMockEnvironment();
  });

  afterEach(() => {
    mockEnv.reset();
  });

  describe('Binary Path Functions', () => {
    it('should return correct binary paths based on platform', async () => {
      // Test Windows binary naming
      mockEnv.mockState.system.platform = 'win32';

      const uvBinaryName = await mockEnv.processUtilsMock.getBinaryName('uv');
      expect(uvBinaryName).toBe('uv.exe');

      const uvBinaryPath = await mockEnv.processUtilsMock.getBinaryPath('uv');
      expect(uvBinaryPath).toContain('.eigent/bin');
      expect(uvBinaryPath).toContain('uv.exe');
    });

    it('should return correct binary paths for macOS', async () => {
      mockEnv.scenarios.macOSEnvironment();

      const uvBinaryName = await mockEnv.processUtilsMock.getBinaryName('uv');
      expect(uvBinaryName).toBe('uv');

      const uvBinaryPath = await mockEnv.processUtilsMock.getBinaryPath('uv');
      expect(uvBinaryPath).toContain('.eigent/bin');
      expect(uvBinaryPath).toContain('/uv');
      expect(uvBinaryPath).not.toContain('.exe');
    });
  });

  describe('Directory Path Functions', () => {
    it('should return correct backend path for development mode', () => {
      mockEnv.mockState.app.isPackaged = false;

      const backendPath = mockEnv.processUtilsMock.getBackendPath();
      expect(backendPath).toContain('/backend');
      expect(backendPath).not.toContain('resources');
    });

    it('should return correct backend path for packaged app', () => {
      mockEnv.scenarios.packagedApp();

      const backendPath = mockEnv.processUtilsMock.getBackendPath();
      expect(backendPath).toContain('backend');
      // In packaged mode, it should use resources path
      expect(mockEnv.mockState.app.isPackaged).toBe(true);
    });

    it('should return correct cache paths', () => {
      const cachePath = mockEnv.processUtilsMock.getCachePath('models');
      expect(cachePath).toContain('.eigent/cache/models');
    });

    it('should return correct venv paths', () => {
      const venvPath = mockEnv.processUtilsMock.getVenvPath('1.0.0');
      expect(venvPath).toContain('.eigent/venvs/backend-1.0.0');
    });
  });

  describe('Binary Existence Checking', () => {
    it('should correctly check binary existence', async () => {
      // Set up scenario where uv exists but bun doesn't
      mockEnv.mockState.filesystem.binariesExist = { uv: true, bun: false };

      const uvExists = await mockEnv.processUtilsMock.isBinaryExists('uv');
      const bunExists = await mockEnv.processUtilsMock.isBinaryExists('bun');

      expect(uvExists).toBe(true);
      expect(bunExists).toBe(false);
    });
  });

  describe('Old Venv Cleanup', () => {
    it('should cleanup old venvs correctly', async () => {
      // Set up scenario with multiple old venvs
      mockEnv.scenarios.multipleOldVenvs('1.0.0');

      const initialOldVenvs = [...mockEnv.mockState.filesystem.oldVenvsExist];
      expect(initialOldVenvs).toContain('backend-0.9.0');
      expect(initialOldVenvs).toContain('backend-0.9.5');
      expect(initialOldVenvs).toContain('backend-1.0.1-beta');

      // Run cleanup
      await mockEnv.processUtilsMock.cleanupOldVenvs('1.0.0');

      // Should keep current version but remove others
      const remainingVenvs = mockEnv.mockState.filesystem.oldVenvsExist;
      console.log(remainingVenvs);

      expect(remainingVenvs).toContain('backend-1.0.0');
      expect(remainingVenvs).not.toContain('backend-0.9.0');
      expect(remainingVenvs).not.toContain('backend-0.9.5');
      expect(remainingVenvs).not.toContain('backend-1.0.1-beta');
    });
  });

  describe('Installation Decision Matrix', () => {
    it('should correctly determine when installation is needed', () => {
      // Test the decision logic that createWindow uses
      const checkInstallationNeeded = (mockState: any) => {
        const currentVersion = mockState.app.currentVersion;
        const versionExists = mockState.filesystem.versionFileExists;
        const savedVersion = versionExists
          ? mockState.filesystem.versionFileContent
          : '';
        const uvExists = mockState.filesystem.binariesExist['uv'] || false;
        const bunExists = mockState.filesystem.binariesExist['bun'] || false;
        const installationCompleted = mockState.filesystem.installedLockExists;

        return (
          !versionExists ||
          savedVersion !== currentVersion ||
          !uvExists ||
          !bunExists ||
          !installationCompleted
        );
      };

      // Test fresh install scenario
      mockEnv.scenarios.freshInstall();
      expect(checkInstallationNeeded(mockEnv.mockState)).toBe(true);

      // Test version update scenario
      mockEnv.scenarios.versionUpdate('0.9.0', '1.0.0');
      expect(checkInstallationNeeded(mockEnv.mockState)).toBe(true);

      // Test all good scenario
      mockEnv.mockState.filesystem.versionFileExists = true;
      mockEnv.mockState.filesystem.versionFileContent = '1.0.0';
      mockEnv.mockState.app.currentVersion = '1.0.0';
      mockEnv.mockState.filesystem.binariesExist = { uv: true, bun: true };
      mockEnv.mockState.filesystem.installedLockExists = true;
      expect(checkInstallationNeeded(mockEnv.mockState)).toBe(false);
    });
  });

  describe('File System Operations', () => {
    it('should handle directory creation correctly', () => {
      // Test .eigent directory creation
      mockEnv.scenarios.missingEigentDirectories();

      expect(mockEnv.mockState.filesystem.eigentDirExists).toBe(false);
      expect(mockEnv.mockState.filesystem.eigentBinDirExists).toBe(false);

      // Simulate directory creation
      mockEnv.fsMock.mkdirSync('/mock/home/.eigent', { recursive: true });
      mockEnv.fsMock.mkdirSync('/mock/home/.eigent/bin', { recursive: true });

      expect(mockEnv.mockState.filesystem.eigentDirExists).toBe(true);
      expect(mockEnv.mockState.filesystem.eigentBinDirExists).toBe(true);
    });

    it('should handle file operations correctly', () => {
      // Test version file operations
      expect(mockEnv.mockState.filesystem.versionFileExists).toBe(true);

      // Write new version
      mockEnv.fsMock.writeFileSync('/path/to/version.txt', '2.0.0');
      expect(mockEnv.mockState.filesystem.versionFileContent).toBe('2.0.0');

      // Delete version file
      mockEnv.fsMock.unlinkSync('/path/to/version.txt');
      expect(mockEnv.mockState.filesystem.versionFileExists).toBe(false);
    });
  });
});