#!/usr/bin/env node

/**
 * Zen Setup CLI
 * Command-line tool for setting up Zen in a Next.js project
 */

import { mkdir, writeFile } from 'node:fs/promises';
import { existsSync } from 'node:fs';
import { resolve, dirname } from 'node:path';
import readline from 'readline';

// File templates
const templates = {
  instrumentation: `// instrumentation.js
export async function register() {
  if (process.env.NEXT_RUNTIME === 'nodejs') {
    const { initializeZen } = await import('@zen/core');
    await initializeZen();
  }
}
`,
  authRedirect: `import { redirect } from 'next/navigation';

export default function Redirect() {
  redirect('/auth/login/');
}
`,
  authCatchAll: `export { default } from '@zen/core/auth/page';
`,
  adminRedirect: `import { redirect } from 'next/navigation';

export default function Redirect() {
  redirect('/admin/dashboard');
}
`,
  adminCatchAll: `export { default } from '@zen/core/admin/page';
`,
  zenApiRoute: `export { GET, POST, PUT, DELETE, PATCH } from '@zen/core/zen/api';
`,
  zenPageRoute: `export { default, generateMetadata } from '@zen/core/modules/page';
`,
  nextConfig: `// next.config.js
module.exports = {
  experimental: {
    instrumentationHook: true,
  },
};
`,
};

// File definitions
const files = [
  {
    path: 'instrumentation.js',
    template: 'instrumentation',
    description: 'Instrumentation file (initialize Zen)',
  },
  {
    path: 'app/(auth)/auth/page.js',
    template: 'authRedirect',
    description: 'Auth redirect page',
  },
  {
    path: 'app/(auth)/auth/[...auth]/page.js',
    template: 'authCatchAll',
    description: 'Auth catch-all route',
  },
  {
    path: 'app/(admin)/admin/page.js',
    template: 'adminRedirect',
    description: 'Admin redirect page',
  },
  {
    path: 'app/(admin)/admin/[...admin]/page.js',
    template: 'adminCatchAll',
    description: 'Admin catch-all route',
  },
  {
    path: 'app/zen/api/[...path]/route.js',
    template: 'zenApiRoute',
    description: 'Zen API catch-all route',
  },
  {
    path: 'app/zen/[...zen]/page.js',
    template: 'zenPageRoute',
    description: 'Zen public pages catch-all route',
  },
];

async function createFile(filePath, content, force = false) {
  const fullPath = resolve(process.cwd(), filePath);

  // Check if file already exists
  if (existsSync(fullPath) && !force) {
    console.log(`⏭️  Skipped (already exists): ${filePath}`);
    return { created: false, skipped: true };
  }

  // Create directory if it doesn't exist
  const dir = dirname(fullPath);
  await mkdir(dir, { recursive: true });

  // Write the file
  await writeFile(fullPath, content, 'utf-8');
  console.log(`✅ Created: ${filePath}`);

  return { created: true, skipped: false };
}

async function setupZen(options = {}) {
  const { force = false } = options;

  console.log('🚀 Setting up Zen for your Next.js project...\n');

  let created = 0;
  let skipped = 0;

  for (const file of files) {
    const result = await createFile(
      file.path,
      templates[file.template],
      force
    );

    if (result.created) created++;
    if (result.skipped) skipped++;
  }

  console.log('\n📝 Summary:');
  console.log(`   ✅ Created: ${created} file${created !== 1 ? 's' : ''}`);
  console.log(`   ⏭️  Skipped: ${skipped} file${skipped !== 1 ? 's' : ''}`);

  // Check if next.config.js needs updating
  const nextConfigPath = resolve(process.cwd(), 'next.config.js');
  const nextConfigExists = existsSync(nextConfigPath);

  if (!nextConfigExists) {
    console.log('\n⚠️  Note: next.config.js not found.');
    console.log('   Make sure to enable instrumentation in your Next.js config:');
    console.log('   experimental: { instrumentationHook: true }');
  }

  console.log('\n🎉 Setup complete!');
  console.log('\nNext steps:');
  console.log('  1. Add Zen styles to your globals.css:');
  console.log('     @import \'@zen/core/styles/zen.css\';');
  console.log('  2. Configure environment variables (see .env.example)');
  console.log('  3. Initialize the database:');
  console.log('     npx zen-db init');
  console.log('\nFor more information, check the INSTALL.md file.');
}

async function listFiles() {
  console.log('📋 Files that will be created:\n');

  for (const file of files) {
    const exists = existsSync(resolve(process.cwd(), file.path));
    const status = exists ? '✓ exists' : '✗ missing';
    console.log(`   ${status}  ${file.path}`);
    console.log(`           ${file.description}`);
  }

  console.log('\nRun "npx zen-setup init" to create missing files.');
}

async function runCLI() {
  const command = process.argv[2];
  const flags = process.argv.slice(3);
  const force = flags.includes('--force') || flags.includes('-f');

  if (!command || command === 'help') {
    console.log(`
Zen Setup CLI

Usage:
  npx zen-setup <command> [options]

Commands:
  init        Create all required files for Zen setup
  list        List all files that will be created
  help        Show this help message

Options:
  --force, -f Force overwrite existing files

Examples:
  npx zen-setup init          # Create missing files
  npx zen-setup init --force  # Overwrite all files
  npx zen-setup list          # List all files
    `);
    process.exit(0);
  }

  try {
    switch (command) {
      case 'init':
        if (force) {
          console.log('⚠️  WARNING: --force flag will overwrite existing files!\n');
          console.log('Type "yes" to confirm or Ctrl+C to cancel...');

          const rl = readline.createInterface({
            input: process.stdin,
            output: process.stdout,
          });

          rl.question('Confirm (yes/no): ', async (answer) => {
            if (answer.toLowerCase() === 'yes') {
              await setupZen({ force: true });
            } else {
              console.log('❌ Operation cancelled.');
            }
            rl.close();
            process.exit(0);
          });
          return; // Don't exit yet
        } else {
          await setupZen({ force: false });
        }
        break;

      case 'list':
        await listFiles();
        break;

      default:
        console.log(`❌ Unknown command: ${command}`);
        console.log('Run "npx zen-setup help" for usage information.');
        process.exit(1);
    }

    process.exit(0);

  } catch (error) {
    console.error('❌ Error:', error.message);
    console.error(error.stack);
    process.exit(1);
  }
}

// Run CLI if called directly
import { fileURLToPath } from 'url';
import { realpathSync } from 'node:fs';
const __filename = realpathSync(fileURLToPath(import.meta.url));
const isMainModule = process.argv[1] && realpathSync(process.argv[1]) === __filename;

if (isMainModule) {
  runCLI();
}

export { runCLI, setupZen };