/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import { escapePath, unescapePath, isSubpath } from './paths.js';

describe('escapePath', () => {
  it.each([
    ['spaces', 'my file.txt', 'my\\ file.txt'],
    ['tabs', 'file\twith\ttabs.txt', 'file\\\twith\\\ttabs.txt'],
    ['parentheses', 'file(1).txt', 'file\\(1\\).txt'],
    ['square brackets', 'file[backup].txt', 'file\\[backup\\].txt'],
    ['curly braces', 'file{temp}.txt', 'file\\{temp\\}.txt'],
    ['semicolons', 'file;name.txt', 'file\\;name.txt'],
    ['ampersands', 'file&name.txt', 'file\\&name.txt'],
    ['pipes', 'file|name.txt', 'file\\|name.txt'],
    ['asterisks', 'file*.txt', 'file\\*.txt'],
    ['question marks', 'file?.txt', 'file\\?.txt'],
    ['dollar signs', 'file$name.txt', 'file\\$name.txt'],
    ['backticks', 'file`name.txt', 'file\\`name.txt'],
    ['single quotes', "file'name.txt", "file\\'name.txt"],
    ['double quotes', 'file"name.txt', 'file\\"name.txt'],
    ['hash symbols', 'file#name.txt', 'file\\#name.txt'],
    ['exclamation marks', 'file!name.txt', 'file\\!name.txt'],
    ['tildes', 'file~name.txt', 'file\\~name.txt'],
    [
      'less than and greater than signs',
      'file<name>.txt',
      'file\\<name\\>.txt',
    ],
  ])('should escape %s', (_, input, expected) => {
    expect(escapePath(input)).toBe(expected);
  });

  it('should handle multiple special characters', () => {
    expect(escapePath('my file (backup) [v1.2].txt')).toBe(
      'my\\ file\\ \\(backup\\)\\ \\[v1.2\\].txt',
    );
  });

  it('should not double-escape already escaped characters', () => {
    expect(escapePath('my\\ file.txt')).toBe('my\\ file.txt');
    expect(escapePath('file\\(name\\).txt')).toBe('file\\(name\\).txt');
  });

  it('should handle escaped backslashes correctly', () => {
    // Double backslash (escaped backslash) followed by space should escape the space
    expect(escapePath('path\\\\ file.txt')).toBe('path\\\\\\ file.txt');
    // Triple backslash (escaped backslash + escaping backslash) followed by space should not double-escape
    expect(escapePath('path\\\\\\ file.txt')).toBe('path\\\\\\ file.txt');
    // Quadruple backslash (two escaped backslashes) followed by space should escape the space
    expect(escapePath('path\\\\\\\\ file.txt')).toBe('path\\\\\\\\\\ file.txt');
  });

  it('should handle complex escaped backslash scenarios', () => {
    // Escaped backslash before special character that needs escaping
    expect(escapePath('file\\\\(test).txt')).toBe('file\\\\\\(test\\).txt');
    // Multiple escaped backslashes
    expect(escapePath('path\\\\\\\\with space.txt')).toBe(
      'path\\\\\\\\with\\ space.txt',
    );
  });

  it('should handle paths without special characters', () => {
    expect(escapePath('normalfile.txt')).toBe('normalfile.txt');
    expect(escapePath('path/to/normalfile.txt')).toBe('path/to/normalfile.txt');
  });

  it('should handle complex real-world examples', () => {
    expect(escapePath('My Documents/Project (2024)/file [backup].txt')).toBe(
      'My\\ Documents/Project\\ \\(2024\\)/file\\ \\[backup\\].txt',
    );
    expect(escapePath('file with $special &chars!.txt')).toBe(
      'file\\ with\\ \\$special\\ \\&chars\\!.txt',
    );
  });

  it('should handle empty strings', () => {
    expect(escapePath('')).toBe('');
  });

  it('should handle paths with only special characters', () => {
    expect(escapePath(' ()[]{};&|*?$`\'"#!~<>')).toBe(
      '\\ \\(\\)\\[\\]\\{\\}\\;\\&\\|\\*\\?\\$\\`\\\'\\"\\#\\!\\~\\<\\>',
    );
  });
});

describe('unescapePath', () => {
  it.each([
    ['spaces', 'my\\ file.txt', 'my file.txt'],
    ['tabs', 'file\\\twith\\\ttabs.txt', 'file\twith\ttabs.txt'],
    ['parentheses', 'file\\(1\\).txt', 'file(1).txt'],
    ['square brackets', 'file\\[backup\\].txt', 'file[backup].txt'],
    ['curly braces', 'file\\{temp\\}.txt', 'file{temp}.txt'],
  ])('should unescape %s', (_, input, expected) => {
    expect(unescapePath(input)).toBe(expected);
  });

  it('should unescape multiple special characters', () => {
    expect(unescapePath('my\\ file\\ \\(backup\\)\\ \\[v1.2\\].txt')).toBe(
      'my file (backup) [v1.2].txt',
    );
  });

  it('should handle paths without escaped characters', () => {
    expect(unescapePath('normalfile.txt')).toBe('normalfile.txt');
    expect(unescapePath('path/to/normalfile.txt')).toBe(
      'path/to/normalfile.txt',
    );
  });

  it('should handle all special characters', () => {
    expect(
      unescapePath(
        '\\ \\(\\)\\[\\]\\{\\}\\;\\&\\|\\*\\?\\$\\`\\\'\\"\\#\\!\\~\\<\\>',
      ),
    ).toBe(' ()[]{};&|*?$`\'"#!~<>');
  });

  it('should be the inverse of escapePath', () => {
    const testCases = [
      'my file.txt',
      'file(1).txt',
      'file[backup].txt',
      'My Documents/Project (2024)/file [backup].txt',
      'file with $special &chars!.txt',
      ' ()[]{};&|*?$`\'"#!~<>',
      'file\twith\ttabs.txt',
    ];

    testCases.forEach((testCase) => {
      expect(unescapePath(escapePath(testCase))).toBe(testCase);
    });
  });

  it('should handle empty strings', () => {
    expect(unescapePath('')).toBe('');
  });

  it('should not affect backslashes not followed by special characters', () => {
    expect(unescapePath('file\\name.txt')).toBe('file\\name.txt');
    expect(unescapePath('path\\to\\file.txt')).toBe('path\\to\\file.txt');
  });

  it('should handle escaped backslashes in unescaping', () => {
    // Should correctly unescape when there are escaped backslashes
    expect(unescapePath('path\\\\\\ file.txt')).toBe('path\\\\ file.txt');
    expect(unescapePath('path\\\\\\\\\\ file.txt')).toBe(
      'path\\\\\\\\ file.txt',
    );
    expect(unescapePath('file\\\\\\(test\\).txt')).toBe('file\\\\(test).txt');
  });
});

describe('isSubpath', () => {
  it('should return true for a direct subpath', () => {
    expect(isSubpath('/a/b', '/a/b/c')).toBe(true);
  });

  it('should return true for the same path', () => {
    expect(isSubpath('/a/b', '/a/b')).toBe(true);
  });

  it('should return false for a parent path', () => {
    expect(isSubpath('/a/b/c', '/a/b')).toBe(false);
  });

  it('should return false for a completely different path', () => {
    expect(isSubpath('/a/b', '/x/y')).toBe(false);
  });

  it('should handle relative paths', () => {
    expect(isSubpath('a/b', 'a/b/c')).toBe(true);
    expect(isSubpath('a/b', 'a/c')).toBe(false);
  });

  it('should handle paths with ..', () => {
    expect(isSubpath('/a/b', '/a/b/../b/c')).toBe(true);
    expect(isSubpath('/a/b', '/a/c/../b')).toBe(true);
  });

  it('should handle root paths', () => {
    expect(isSubpath('/', '/a')).toBe(true);
    expect(isSubpath('/a', '/')).toBe(false);
  });

  it('should handle trailing slashes', () => {
    expect(isSubpath('/a/b/', '/a/b/c')).toBe(true);
    expect(isSubpath('/a/b', '/a/b/c/')).toBe(true);
    expect(isSubpath('/a/b/', '/a/b/c/')).toBe(true);
  });
});

describe('isSubpath on Windows', () => {
  const originalPlatform = process.platform;

  beforeAll(() => {
    Object.defineProperty(process, 'platform', {
      value: 'win32',
    });
  });

  afterAll(() => {
    Object.defineProperty(process, 'platform', {
      value: originalPlatform,
    });
  });

  it('should return true for a direct subpath on Windows', () => {
    expect(isSubpath('C:\\Users\\Test', 'C:\\Users\\Test\\file.txt')).toBe(
      true,
    );
  });

  it('should return true for the same path on Windows', () => {
    expect(isSubpath('C:\\Users\\Test', 'C:\\Users\\Test')).toBe(true);
  });

  it('should return false for a parent path on Windows', () => {
    expect(isSubpath('C:\\Users\\Test\\file.txt', 'C:\\Users\\Test')).toBe(
      false,
    );
  });

  it('should return false for a different drive on Windows', () => {
    expect(isSubpath('C:\\Users\\Test', 'D:\\Users\\Test')).toBe(false);
  });

  it('should be case-insensitive for drive letters on Windows', () => {
    expect(isSubpath('c:\\Users\\Test', 'C:\\Users\\Test\\file.txt')).toBe(
      true,
    );
  });

  it('should be case-insensitive for path components on Windows', () => {
    expect(isSubpath('C:\\Users\\Test', 'c:\\users\\test\\file.txt')).toBe(
      true,
    );
  });

  it('should handle mixed slashes on Windows', () => {
    expect(isSubpath('C:/Users/Test', 'C:\\Users\\Test\\file.txt')).toBe(true);
  });

  it('should handle trailing slashes on Windows', () => {
    expect(isSubpath('C:\\Users\\Test\\', 'C:\\Users\\Test\\file.txt')).toBe(
      true,
    );
  });

  it('should handle relative paths correctly on Windows', () => {
    expect(isSubpath('Users\\Test', 'Users\\Test\\file.txt')).toBe(true);
    expect(isSubpath('Users\\Test\\file.txt', 'Users\\Test')).toBe(false);
  });
});