/**
 * Tests for scripts/lib/package-manager.js
 *
 * Run with: node tests/lib/package-manager.test.js
 */

const assert = require('assert');
const path = require('path');
const fs = require('fs');
const os = require('os');

// Import the modules
const pm = require('../../scripts/lib/package-manager');

// Test helper
function test(name, fn) {
  try {
    fn();
    console.log(`  ✓ ${name}`);
    return true;
  } catch (err) {
    console.log(`  ✗ ${name}`);
    console.log(`    Error: ${err.message}`);
    return false;
  }
}

// Create a temporary test directory
function createTestDir() {
  const testDir = path.join(os.tmpdir(), `pm-test-${Date.now()}`);
  fs.mkdirSync(testDir, { recursive: true });
  return testDir;
}

// Clean up test directory
function cleanupTestDir(testDir) {
  fs.rmSync(testDir, { recursive: true, force: true });
}

// Test suite
function runTests() {
  console.log('\n=== Testing package-manager.js ===\n');

  let passed = 0;
  let failed = 0;

  // PACKAGE_MANAGERS constant tests
  console.log('PACKAGE_MANAGERS Constant:');

  if (test('PACKAGE_MANAGERS has all expected managers', () => {
    assert.ok(pm.PACKAGE_MANAGERS.npm, 'Should have npm');
    assert.ok(pm.PACKAGE_MANAGERS.pnpm, 'Should have pnpm');
    assert.ok(pm.PACKAGE_MANAGERS.yarn, 'Should have yarn');
    assert.ok(pm.PACKAGE_MANAGERS.bun, 'Should have bun');
  })) passed++; else failed++;

  if (test('Each manager has required properties', () => {
    const requiredProps = ['name', 'lockFile', 'installCmd', 'runCmd', 'execCmd', 'testCmd', 'buildCmd', 'devCmd'];
    for (const [name, config] of Object.entries(pm.PACKAGE_MANAGERS)) {
      for (const prop of requiredProps) {
        assert.ok(config[prop], `${name} should have ${prop}`);
      }
    }
  })) passed++; else failed++;

  // detectFromLockFile tests
  console.log('\ndetectFromLockFile:');

  if (test('detects npm from package-lock.json', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package-lock.json'), '{}');
      const result = pm.detectFromLockFile(testDir);
      assert.strictEqual(result, 'npm');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('detects pnpm from pnpm-lock.yaml', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'pnpm-lock.yaml'), '');
      const result = pm.detectFromLockFile(testDir);
      assert.strictEqual(result, 'pnpm');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('detects yarn from yarn.lock', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'yarn.lock'), '');
      const result = pm.detectFromLockFile(testDir);
      assert.strictEqual(result, 'yarn');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('detects bun from bun.lockb', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'bun.lockb'), '');
      const result = pm.detectFromLockFile(testDir);
      assert.strictEqual(result, 'bun');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('returns null when no lock file exists', () => {
    const testDir = createTestDir();
    try {
      const result = pm.detectFromLockFile(testDir);
      assert.strictEqual(result, null);
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('respects detection priority (pnpm > npm)', () => {
    const testDir = createTestDir();
    try {
      // Create both lock files
      fs.writeFileSync(path.join(testDir, 'package-lock.json'), '{}');
      fs.writeFileSync(path.join(testDir, 'pnpm-lock.yaml'), '');
      const result = pm.detectFromLockFile(testDir);
      // pnpm has higher priority in DETECTION_PRIORITY
      assert.strictEqual(result, 'pnpm');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  // detectFromPackageJson tests
  console.log('\ndetectFromPackageJson:');

  if (test('detects package manager from packageManager field', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package.json'), JSON.stringify({
        name: 'test',
        packageManager: 'pnpm@8.6.0'
      }));
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, 'pnpm');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('handles packageManager without version', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package.json'), JSON.stringify({
        name: 'test',
        packageManager: 'yarn'
      }));
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, 'yarn');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('returns null when no packageManager field', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package.json'), JSON.stringify({
        name: 'test'
      }));
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, null);
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('returns null when no package.json exists', () => {
    const testDir = createTestDir();
    try {
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, null);
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  // getAvailablePackageManagers tests
  console.log('\ngetAvailablePackageManagers:');

  if (test('returns array of available managers', () => {
    const available = pm.getAvailablePackageManagers();
    assert.ok(Array.isArray(available), 'Should return array');
    // npm should always be available with Node.js
    assert.ok(available.includes('npm'), 'npm should be available');
  })) passed++; else failed++;

  // getPackageManager tests
  console.log('\ngetPackageManager:');

  if (test('returns object with name, config, and source', () => {
    const result = pm.getPackageManager();
    assert.ok(result.name, 'Should have name');
    assert.ok(result.config, 'Should have config');
    assert.ok(result.source, 'Should have source');
  })) passed++; else failed++;

  if (test('respects environment variable', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'yarn';
      const result = pm.getPackageManager();
      assert.strictEqual(result.name, 'yarn');
      assert.strictEqual(result.source, 'environment');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  if (test('detects from lock file in project', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    delete process.env.CLAUDE_PACKAGE_MANAGER;

    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'bun.lockb'), '');
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.strictEqual(result.name, 'bun');
      assert.strictEqual(result.source, 'lock-file');
    } finally {
      cleanupTestDir(testDir);
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
    }
  })) passed++; else failed++;

  // getRunCommand tests
  console.log('\ngetRunCommand:');

  if (test('returns correct install command', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'pnpm';
      const cmd = pm.getRunCommand('install');
      assert.strictEqual(cmd, 'pnpm install');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  if (test('returns correct test command', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getRunCommand('test');
      assert.strictEqual(cmd, 'npm test');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // getExecCommand tests
  console.log('\ngetExecCommand:');

  if (test('returns correct exec command for npm', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('prettier', '--write .');
      assert.strictEqual(cmd, 'npx prettier --write .');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  if (test('returns correct exec command for pnpm', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'pnpm';
      const cmd = pm.getExecCommand('eslint', '.');
      assert.strictEqual(cmd, 'pnpm dlx eslint .');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // getCommandPattern tests
  console.log('\ngetCommandPattern:');

  if (test('generates pattern for dev command', () => {
    const pattern = pm.getCommandPattern('dev');
    assert.ok(pattern.includes('npm run dev'), 'Should include npm');
    assert.ok(pattern.includes('pnpm'), 'Should include pnpm');
    assert.ok(pattern.includes('yarn dev'), 'Should include yarn');
    assert.ok(pattern.includes('bun run dev'), 'Should include bun');
  })) passed++; else failed++;

  if (test('pattern matches actual commands', () => {
    const pattern = pm.getCommandPattern('test');
    const regex = new RegExp(pattern);

    assert.ok(regex.test('npm test'), 'Should match npm test');
    assert.ok(regex.test('pnpm test'), 'Should match pnpm test');
    assert.ok(regex.test('yarn test'), 'Should match yarn test');
    assert.ok(regex.test('bun test'), 'Should match bun test');
    assert.ok(!regex.test('cargo test'), 'Should not match cargo test');
  })) passed++; else failed++;

  // getSelectionPrompt tests
  console.log('\ngetSelectionPrompt:');

  if (test('returns informative prompt', () => {
    const prompt = pm.getSelectionPrompt();
    assert.ok(prompt.includes('Supported package managers'), 'Should list supported managers');
    assert.ok(prompt.includes('CLAUDE_PACKAGE_MANAGER'), 'Should mention env var');
    assert.ok(prompt.includes('lock file'), 'Should mention lock file option');
  })) passed++; else failed++;

  // setProjectPackageManager tests
  console.log('\nsetProjectPackageManager:');

  if (test('sets project package manager', () => {
    const testDir = createTestDir();
    try {
      const result = pm.setProjectPackageManager('pnpm', testDir);
      assert.strictEqual(result.packageManager, 'pnpm');
      assert.ok(result.setAt, 'Should have setAt timestamp');

      // Verify file was created
      const configPath = path.join(testDir, '.claude', 'package-manager.json');
      assert.ok(fs.existsSync(configPath), 'Config file should exist');
      const saved = JSON.parse(fs.readFileSync(configPath, 'utf8'));
      assert.strictEqual(saved.packageManager, 'pnpm');
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('rejects unknown package manager', () => {
    assert.throws(() => {
      pm.setProjectPackageManager('cargo');
    }, /Unknown package manager/);
  })) passed++; else failed++;

  // setPreferredPackageManager tests
  console.log('\nsetPreferredPackageManager:');

  if (test('rejects unknown package manager', () => {
    assert.throws(() => {
      pm.setPreferredPackageManager('pip');
    }, /Unknown package manager/);
  })) passed++; else failed++;

  // detectFromPackageJson edge cases
  console.log('\ndetectFromPackageJson (edge cases):');

  if (test('handles invalid JSON in package.json', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package.json'), 'NOT VALID JSON');
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, null);
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  if (test('returns null for unknown package manager in packageManager field', () => {
    const testDir = createTestDir();
    try {
      fs.writeFileSync(path.join(testDir, 'package.json'), JSON.stringify({
        name: 'test',
        packageManager: 'deno@1.0'
      }));
      const result = pm.detectFromPackageJson(testDir);
      assert.strictEqual(result, null);
    } finally {
      cleanupTestDir(testDir);
    }
  })) passed++; else failed++;

  // getExecCommand edge cases
  console.log('\ngetExecCommand (edge cases):');

  if (test('returns exec command without args', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('prettier');
      assert.strictEqual(cmd, 'npx prettier');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // getRunCommand additional cases
  console.log('\ngetRunCommand (additional):');

  if (test('returns correct build command', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      assert.strictEqual(pm.getRunCommand('build'), 'npm run build');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  if (test('returns correct dev command', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      assert.strictEqual(pm.getRunCommand('dev'), 'npm run dev');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  if (test('returns correct custom script command', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      assert.strictEqual(pm.getRunCommand('lint'), 'npm run lint');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // DETECTION_PRIORITY tests
  console.log('\nDETECTION_PRIORITY:');

  if (test('has pnpm first', () => {
    assert.strictEqual(pm.DETECTION_PRIORITY[0], 'pnpm');
  })) passed++; else failed++;

  if (test('has npm last', () => {
    assert.strictEqual(pm.DETECTION_PRIORITY[pm.DETECTION_PRIORITY.length - 1], 'npm');
  })) passed++; else failed++;

  // getCommandPattern additional cases
  console.log('\ngetCommandPattern (additional):');

  if (test('generates pattern for install command', () => {
    const pattern = pm.getCommandPattern('install');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm install'), 'Should match npm install');
    assert.ok(regex.test('pnpm install'), 'Should match pnpm install');
    assert.ok(regex.test('yarn'), 'Should match yarn (install implicit)');
    assert.ok(regex.test('bun install'), 'Should match bun install');
  })) passed++; else failed++;

  if (test('generates pattern for custom action', () => {
    const pattern = pm.getCommandPattern('lint');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run lint'), 'Should match npm run lint');
    assert.ok(regex.test('pnpm lint'), 'Should match pnpm lint');
    assert.ok(regex.test('yarn lint'), 'Should match yarn lint');
    assert.ok(regex.test('bun run lint'), 'Should match bun run lint');
  })) passed++; else failed++;

  // getPackageManager robustness tests
  console.log('\ngetPackageManager (robustness):');

  if (test('falls through on corrupted project config JSON', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-robust-'));
    const claudeDir = path.join(testDir, '.claude');
    fs.mkdirSync(claudeDir, { recursive: true });
    fs.writeFileSync(path.join(claudeDir, 'package-manager.json'), '{not valid json!!!');

    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      // Should fall through to default (npm) since project config is corrupt
      assert.ok(result.name, 'Should return a package manager');
      assert.ok(result.source !== 'project-config', 'Should not use corrupt project config');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('falls through on project config with unknown PM', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-robust-'));
    const claudeDir = path.join(testDir, '.claude');
    fs.mkdirSync(claudeDir, { recursive: true });
    fs.writeFileSync(path.join(claudeDir, 'package-manager.json'),
      JSON.stringify({ packageManager: 'nonexistent-pm' }));

    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.ok(result.name, 'Should return a package manager');
      assert.ok(result.source !== 'project-config', 'Should not use unknown PM config');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  // getRunCommand validation tests
  console.log('\ngetRunCommand (validation):');

  if (test('rejects empty script name', () => {
    assert.throws(() => pm.getRunCommand(''), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects null script name', () => {
    assert.throws(() => pm.getRunCommand(null), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects script name with shell metacharacters', () => {
    assert.throws(() => pm.getRunCommand('test; rm -rf /'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('rejects script name with backticks', () => {
    assert.throws(() => pm.getRunCommand('test`whoami`'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('accepts scoped package names', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getRunCommand('@scope/my-script');
      assert.strictEqual(cmd, 'npm run @scope/my-script');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // getExecCommand validation tests
  console.log('\ngetExecCommand (validation):');

  if (test('rejects empty binary name', () => {
    assert.throws(() => pm.getExecCommand(''), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects null binary name', () => {
    assert.throws(() => pm.getExecCommand(null), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects binary name with shell metacharacters', () => {
    assert.throws(() => pm.getExecCommand('prettier; cat /etc/passwd'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('accepts dotted binary names like tsc', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('tsc');
      assert.strictEqual(cmd, 'npx tsc');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // getPackageManager source detection tests
  console.log('\ngetPackageManager (source detection):');

  if (test('detects from valid project-config (.claude/package-manager.json)', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-projcfg-'));
    const claudeDir = path.join(testDir, '.claude');
    fs.mkdirSync(claudeDir, { recursive: true });
    fs.writeFileSync(path.join(claudeDir, 'package-manager.json'),
      JSON.stringify({ packageManager: 'pnpm' }));

    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.strictEqual(result.name, 'pnpm', 'Should detect pnpm from project config');
      assert.strictEqual(result.source, 'project-config', 'Source should be project-config');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('project-config takes priority over package.json', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-priority-'));
    const claudeDir = path.join(testDir, '.claude');
    fs.mkdirSync(claudeDir, { recursive: true });

    // Project config says bun
    fs.writeFileSync(path.join(claudeDir, 'package-manager.json'),
      JSON.stringify({ packageManager: 'bun' }));
    // package.json says yarn
    fs.writeFileSync(path.join(testDir, 'package.json'),
      JSON.stringify({ packageManager: 'yarn@4.0.0' }));
    // Lock file says npm
    fs.writeFileSync(path.join(testDir, 'package-lock.json'), '{}');

    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.strictEqual(result.name, 'bun', 'Project config should win over package.json and lock file');
      assert.strictEqual(result.source, 'project-config');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('package.json takes priority over lock file', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-pj-lock-'));
    // package.json says yarn
    fs.writeFileSync(path.join(testDir, 'package.json'),
      JSON.stringify({ packageManager: 'yarn@4.0.0' }));
    // Lock file says npm
    fs.writeFileSync(path.join(testDir, 'package-lock.json'), '{}');

    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.strictEqual(result.name, 'yarn', 'package.json should win over lock file');
      assert.strictEqual(result.source, 'package.json');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('defaults to npm when no config found', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-default-'));
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      const result = pm.getPackageManager({ projectDir: testDir });
      assert.strictEqual(result.name, 'npm', 'Should default to npm');
      assert.strictEqual(result.source, 'default');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  // setPreferredPackageManager success
  console.log('\nsetPreferredPackageManager (success):');

  if (test('successfully saves preferred package manager', () => {
    // This writes to ~/.claude/package-manager.json — read original to restore
    const utils = require('../../scripts/lib/utils');
    const configPath = path.join(utils.getClaudeDir(), 'package-manager.json');
    const original = utils.readFile(configPath);
    try {
      const config = pm.setPreferredPackageManager('bun');
      assert.strictEqual(config.packageManager, 'bun');
      assert.ok(config.setAt, 'Should have setAt timestamp');
      // Verify it was persisted
      const saved = JSON.parse(fs.readFileSync(configPath, 'utf8'));
      assert.strictEqual(saved.packageManager, 'bun');
    } finally {
      // Restore original config
      if (original) {
        fs.writeFileSync(configPath, original, 'utf8');
      } else {
        try { fs.unlinkSync(configPath); } catch {}
      }
    }
  })) passed++; else failed++;

  // getCommandPattern completeness
  console.log('\ngetCommandPattern (completeness):');

  if (test('generates pattern for test command', () => {
    const pattern = pm.getCommandPattern('test');
    assert.ok(pattern.includes('npm test'), 'Should include npm test');
    assert.ok(pattern.includes('pnpm test'), 'Should include pnpm test');
    assert.ok(pattern.includes('bun test'), 'Should include bun test');
  })) passed++; else failed++;

  if (test('generates pattern for build command', () => {
    const pattern = pm.getCommandPattern('build');
    assert.ok(pattern.includes('npm run build'), 'Should include npm run build');
    assert.ok(pattern.includes('yarn build'), 'Should include yarn build');
  })) passed++; else failed++;

  // getRunCommand PM-specific format tests
  console.log('\ngetRunCommand (PM-specific formats):');

  if (test('pnpm custom script: pnpm <script> (no run keyword)', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'pnpm';
      const cmd = pm.getRunCommand('lint');
      assert.strictEqual(cmd, 'pnpm lint', 'pnpm uses "pnpm <script>" format');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('yarn custom script: yarn <script>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'yarn';
      const cmd = pm.getRunCommand('format');
      assert.strictEqual(cmd, 'yarn format', 'yarn uses "yarn <script>" format');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('bun custom script: bun run <script>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'bun';
      const cmd = pm.getRunCommand('typecheck');
      assert.strictEqual(cmd, 'bun run typecheck', 'bun uses "bun run <script>" format');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('npm custom script: npm run <script>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getRunCommand('lint');
      assert.strictEqual(cmd, 'npm run lint', 'npm uses "npm run <script>" format');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('pnpm install returns pnpm install', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'pnpm';
      assert.strictEqual(pm.getRunCommand('install'), 'pnpm install');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('yarn install returns yarn (no install keyword)', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'yarn';
      assert.strictEqual(pm.getRunCommand('install'), 'yarn');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('bun test returns bun test', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'bun';
      assert.strictEqual(pm.getRunCommand('test'), 'bun test');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  // getExecCommand PM-specific format tests
  console.log('\ngetExecCommand (PM-specific formats):');

  if (test('pnpm exec: pnpm dlx <binary>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'pnpm';
      assert.strictEqual(pm.getExecCommand('prettier', '--write .'), 'pnpm dlx prettier --write .');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('yarn exec: yarn dlx <binary>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'yarn';
      assert.strictEqual(pm.getExecCommand('eslint', '.'), 'yarn dlx eslint .');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('bun exec: bunx <binary>', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'bun';
      assert.strictEqual(pm.getExecCommand('tsc', '--noEmit'), 'bunx tsc --noEmit');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('ignores unknown env var package manager', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'totally-fake-pm';
      const result = pm.getPackageManager();
      // Should ignore invalid env var and fall through
      assert.notStrictEqual(result.name, 'totally-fake-pm', 'Should not use unknown PM');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      } else {
        delete process.env.CLAUDE_PACKAGE_MANAGER;
      }
    }
  })) passed++; else failed++;

  // ─── Round 21: getExecCommand args validation ───
  console.log('\ngetExecCommand (args validation):');

  if (test('rejects args with shell metacharacter semicolon', () => {
    assert.throws(() => pm.getExecCommand('prettier', '; rm -rf /'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('rejects args with pipe character', () => {
    assert.throws(() => pm.getExecCommand('prettier', '--write . | cat'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('rejects args with backtick injection', () => {
    assert.throws(() => pm.getExecCommand('prettier', '`whoami`'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('rejects args with dollar sign', () => {
    assert.throws(() => pm.getExecCommand('prettier', '$HOME'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('rejects args with ampersand', () => {
    assert.throws(() => pm.getExecCommand('prettier', '--write . && echo pwned'), /unsafe characters/);
  })) passed++; else failed++;

  if (test('allows safe args like --write .', () => {
    const cmd = pm.getExecCommand('prettier', '--write .');
    assert.ok(cmd.includes('--write .'), 'Should include safe args');
  })) passed++; else failed++;

  if (test('allows empty args without trailing space', () => {
    const cmd = pm.getExecCommand('prettier', '');
    assert.ok(!cmd.endsWith(' '), 'Should not have trailing space for empty args');
  })) passed++; else failed++;

  // ─── Round 21: getCommandPattern regex escaping ───
  console.log('\ngetCommandPattern (regex escaping):');

  if (test('escapes dot in action name for regex safety', () => {
    const pattern = pm.getCommandPattern('test.all');
    // The dot should be escaped to \\. in the pattern
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run test.all'), 'Should match literal dot');
    assert.ok(!regex.test('npm run testXall'), 'Should NOT match arbitrary character in place of dot');
  })) passed++; else failed++;

  if (test('escapes brackets in action name', () => {
    const pattern = pm.getCommandPattern('build[prod]');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run build[prod]'), 'Should match literal brackets');
  })) passed++; else failed++;

  if (test('escapes parentheses in action name', () => {
    // Should not throw when compiled as regex
    const pattern = pm.getCommandPattern('foo(bar)');
    assert.doesNotThrow(() => new RegExp(pattern), 'Should produce valid regex with escaped parens');
  })) passed++; else failed++;

  // ── Round 27: input validation and escapeRegex edge cases ──
  console.log('\ngetRunCommand (non-string input):');

  if (test('rejects undefined script name', () => {
    assert.throws(() => pm.getRunCommand(undefined), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects numeric script name', () => {
    assert.throws(() => pm.getRunCommand(123), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects boolean script name', () => {
    assert.throws(() => pm.getRunCommand(true), /non-empty string/);
  })) passed++; else failed++;

  console.log('\ngetExecCommand (non-string binary):');

  if (test('rejects undefined binary name', () => {
    assert.throws(() => pm.getExecCommand(undefined), /non-empty string/);
  })) passed++; else failed++;

  if (test('rejects numeric binary name', () => {
    assert.throws(() => pm.getExecCommand(42), /non-empty string/);
  })) passed++; else failed++;

  console.log('\ngetCommandPattern (escapeRegex completeness):');

  if (test('escapes all regex metacharacters in action', () => {
    // All regex metacharacters: . * + ? ^ $ { } ( ) | [ ] \
    const action = 'test.*+?^${}()|[]\\';
    const pattern = pm.getCommandPattern(action);
    // Should produce a valid regex without throwing
    assert.doesNotThrow(() => new RegExp(pattern), 'Should produce valid regex');
    // Should match the literal string
    const regex = new RegExp(pattern);
    assert.ok(regex.test(`npm run ${action}`), 'Should match literal metacharacters');
  })) passed++; else failed++;

  if (test('escapeRegex preserves alphanumeric chars', () => {
    const pattern = pm.getCommandPattern('simple-test');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run simple-test'), 'Should match simple action name');
    assert.ok(!regex.test('npm run simpleXtest'), 'Dash should not match arbitrary char');
  })) passed++; else failed++;

  console.log('\ngetPackageManager (global config edge cases):');

  if (test('ignores global config with non-string packageManager', () => {
    // This tests the path through loadConfig where packageManager is not a valid PM name
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      delete process.env.CLAUDE_PACKAGE_MANAGER;
      // getPackageManager should fall through to default when no valid config exists
      const result = pm.getPackageManager({ projectDir: os.tmpdir() });
      assert.ok(result.name, 'Should return a package manager name');
      assert.ok(result.config, 'Should return config object');
    } finally {
      if (originalEnv !== undefined) {
        process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      }
    }
  })) passed++; else failed++;

  // ── Round 30: getCommandPattern with special action patterns ──
  console.log('\nRound 30: getCommandPattern edge cases:');

  if (test('escapes pipe character in action name', () => {
    const pattern = pm.getCommandPattern('lint|fix');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run lint|fix'), 'Should match literal pipe');
    assert.ok(!regex.test('npm run lint'), 'Pipe should be literal, not regex OR');
  })) passed++; else failed++;

  if (test('escapes dollar sign in action name', () => {
    const pattern = pm.getCommandPattern('deploy$prod');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run deploy$prod'), 'Should match literal dollar sign');
  })) passed++; else failed++;

  if (test('handles action with leading/trailing spaces gracefully', () => {
    // Spaces aren't special in regex but good to test the full pattern
    const pattern = pm.getCommandPattern(' dev ');
    const regex = new RegExp(pattern);
    assert.ok(regex.test('npm run  dev '), 'Should match action with spaces');
  })) passed++; else failed++;

  if (test('known action "dev" does NOT use escapeRegex path', () => {
    // "dev" is a known action with hardcoded patterns, not the generic path
    const pattern = pm.getCommandPattern('dev');
    // Should match pnpm dev (without "run")
    const regex = new RegExp(pattern);
    assert.ok(regex.test('pnpm dev'), 'Known action pnpm dev should match');
  })) passed++; else failed++;

  // ── Round 31: setProjectPackageManager write verification ──
  console.log('\nsetProjectPackageManager (write verification, Round 31):');

  if (test('setProjectPackageManager creates .claude directory if missing', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-mkdir-'));
    try {
      const claudeDir = path.join(testDir, '.claude');
      assert.ok(!fs.existsSync(claudeDir), '.claude should not pre-exist');
      pm.setProjectPackageManager('npm', testDir);
      assert.ok(fs.existsSync(claudeDir), '.claude should be created');
      const configPath = path.join(claudeDir, 'package-manager.json');
      assert.ok(fs.existsSync(configPath), 'Config file should be created');
    } finally {
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('setProjectPackageManager includes setAt timestamp', () => {
    const testDir = fs.mkdtempSync(path.join(os.tmpdir(), 'pm-ts-'));
    try {
      const before = new Date().toISOString();
      const config = pm.setProjectPackageManager('yarn', testDir);
      const after = new Date().toISOString();
      assert.ok(config.setAt >= before, 'setAt should be >= before');
      assert.ok(config.setAt <= after, 'setAt should be <= after');
    } finally {
      fs.rmSync(testDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  // ── Round 31: getExecCommand safe argument edge cases ──
  console.log('\ngetExecCommand (safe argument edge cases, Round 31):');

  if (test('allows colons in args (e.g. --fix:all)', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('eslint', '--fix:all');
      assert.ok(cmd.includes('--fix:all'), 'Colons should be allowed in args');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('allows at-sign in args (e.g. @latest)', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('create-next-app', '@latest');
      assert.ok(cmd.includes('@latest'), 'At-sign should be allowed in args');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('allows equals in args (e.g. --config=path)', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('prettier', '--config=.prettierrc');
      assert.ok(cmd.includes('--config=.prettierrc'), 'Equals should be allowed');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  // ── Round 34: getExecCommand non-string args & packageManager type ──
  console.log('\nRound 34: getExecCommand non-string args:');

  if (test('getExecCommand with args=0 produces command without extra args', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('prettier', 0);
      // 0 is falsy, so ternary `args ? ' ' + args : ''` yields ''
      assert.ok(!cmd.includes(' 0'), 'Should not append 0 as args');
      assert.ok(cmd.includes('prettier'), 'Should include binary name');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('getExecCommand with args=false produces command without extra args', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('eslint', false);
      assert.ok(!cmd.includes('false'), 'Should not append false as args');
      assert.ok(cmd.includes('eslint'), 'Should include binary name');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  if (test('getExecCommand with args=null produces command without extra args', () => {
    const originalEnv = process.env.CLAUDE_PACKAGE_MANAGER;
    try {
      process.env.CLAUDE_PACKAGE_MANAGER = 'npm';
      const cmd = pm.getExecCommand('tsc', null);
      assert.ok(!cmd.includes('null'), 'Should not append null as args');
      assert.ok(cmd.includes('tsc'), 'Should include binary name');
    } finally {
      if (originalEnv !== undefined) process.env.CLAUDE_PACKAGE_MANAGER = originalEnv;
      else delete process.env.CLAUDE_PACKAGE_MANAGER;
    }
  })) passed++; else failed++;

  console.log('\nRound 34: detectFromPackageJson with non-string packageManager:');

  if (test('detectFromPackageJson handles array packageManager field gracefully', () => {
    const tmpDir = createTestDir();
    try {
      // Write a malformed package.json with array instead of string
      fs.writeFileSync(path.join(tmpDir, 'package.json'),
        JSON.stringify({ packageManager: ['pnpm@8', 'yarn@3'] }));
      // Should not crash — try/catch in detectFromPackageJson catches TypeError
      const result = pm.getPackageManager({ projectDir: tmpDir });
      assert.ok(result.name, 'Should fallback to a valid package manager');
    } finally {
      fs.rmSync(tmpDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  if (test('detectFromPackageJson handles numeric packageManager field gracefully', () => {
    const tmpDir = createTestDir();
    try {
      fs.writeFileSync(path.join(tmpDir, 'package.json'),
        JSON.stringify({ packageManager: 42 }));
      const result = pm.getPackageManager({ projectDir: tmpDir });
      assert.ok(result.name, 'Should fallback to a valid package manager');
    } finally {
      fs.rmSync(tmpDir, { recursive: true, force: true });
    }
  })) passed++; else failed++;

  // Summary
  console.log('\n=== Test Results ===');
  console.log(`Passed: ${passed}`);
  console.log(`Failed: ${failed}`);
  console.log(`Total:  ${passed + failed}\n`);

  process.exit(failed > 0 ? 1 : 0);
}

runTests();