#!/usr/bin/env node

/**
 * Installation verification script
 */

const { execSync } = require('child_process');
const fs = require('fs');
const path = require('path');

console.log('🔍 Verifying MCP ProcFS Server Installation...\n');

const checks = [];

// Check Node.js version
try {
  const nodeVersion = process.version;
  const majorVersion = parseInt(nodeVersion.split('.')[0].replace('v', ''));
  if (majorVersion >= 18) {
    checks.push({ name: 'Node.js version', status: '✓', message: nodeVersion });
  } else {
    checks.push({ name: 'Node.js version', status: '✗', message: `${nodeVersion} (requires >= 18)` });
  }
} catch (error) {
  checks.push({ name: 'Node.js version', status: '✗', message: error.message });
}

// Check if on Linux
const platform = process.platform;
if (platform === 'linux') {
  checks.push({ name: 'Operating System', status: '✓', message: 'Linux' });
} else {
  checks.push({ name: 'Operating System', status: '⚠', message: `${platform} (designed for Linux)` });
}

// Check procfs accessibility
try {
  fs.accessSync('/proc/cpuinfo', fs.constants.R_OK);
  checks.push({ name: '/proc filesystem', status: '✓', message: 'Accessible' });
} catch (error) {
  checks.push({ name: '/proc filesystem', status: '✗', message: 'Not accessible' });
}

// Check if built
const distPath = path.join(__dirname, '..', 'dist');
if (fs.existsSync(distPath)) {
  const files = fs.readdirSync(distPath);
  if (files.length > 0) {
    checks.push({ name: 'TypeScript build', status: '✓', message: 'Compiled' });
  } else {
    checks.push({ name: 'TypeScript build', status: '✗', message: 'Empty dist folder' });
  }
} else {
  checks.push({ name: 'TypeScript build', status: '✗', message: 'Run npm run build' });
}

// Check dependencies
const packageJsonPath = path.join(__dirname, '..', 'package.json');
if (fs.existsSync(packageJsonPath)) {
  const nodeModulesPath = path.join(__dirname, '..', 'node_modules');
  if (fs.existsSync(nodeModulesPath)) {
    checks.push({ name: 'Dependencies', status: '✓', message: 'Installed' });
  } else {
    checks.push({ name: 'Dependencies', status: '✗', message: 'Run npm install' });
  }
}

// Check for sysctl (optional)
try {
  execSync('which sysctl', { stdio: 'pipe' });
  checks.push({ name: 'sysctl utility', status: '✓', message: 'Available' });
} catch (error) {
  checks.push({ name: 'sysctl utility', status: '⚠', message: 'Not found (optional)' });
}

// Print results
console.log('Installation Status:');
console.log('='.repeat(60));
checks.forEach(check => {
  console.log(`${check.status} ${check.name.padEnd(25)} ${check.message}`);
});
console.log('='.repeat(60));

// Summary
const passed = checks.filter(c => c.status === '✓').length;
const total = checks.length;
const warnings = checks.filter(c => c.status === '⚠').length;
const failed = checks.filter(c => c.status === '✗').length;

console.log(`\n✓ Passed: ${passed}/${total}`);
if (warnings > 0) console.log(`⚠ Warnings: ${warnings}`);
if (failed > 0) console.log(`✗ Failed: ${failed}`);

if (failed === 0) {
  console.log('\n✅ Installation verified successfully!');
  console.log('\nNext steps:');
  console.log('  npm start              # Start JSON-RPC server');
  console.log('  npm run start:sse      # Start HTTP/SSE server');
  console.log('  npm test               # Run tests');
  process.exit(0);
} else {
  console.log('\n❌ Installation has issues. Please fix the failed checks above.');
  process.exit(1);
}