/**
 * Script exécuté AVANT le build sur Vercel (via prebuild)
 * 1. Installe @tailwindcss/postcss pour Vercel
 * 2. Supprime le code CDN Tailwind pour éviter le double-chargement
 */

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

console.log('\n🔧 [PREBUILD] Starting Vercel preparation script...');
console.log('📋 Environment:', {
  VERCEL: process.env.VERCEL,
  NEXT_PUBLIC_VERCEL: process.env.NEXT_PUBLIC_VERCEL,
  NODE_ENV: process.env.NODE_ENV
});

// Seulement sur Vercel
if (process.env.VERCEL === '1' || process.env.NEXT_PUBLIC_VERCEL === '1') {
  console.log('✅ Running on Vercel - preparing for build...\n');

  // Install Tailwind CSS v4 for Vercel build (per official docs)
  console.log('📦 Installing Tailwind CSS v4 packages...');
  try {
    // Per https://tailwindcss.com/docs/installation/framework-guides
    // Need to install: tailwindcss @tailwindcss/postcss postcss
    execSync('npm install tailwindcss @tailwindcss/postcss postcss --legacy-peer-deps', {
      stdio: 'inherit'
    });
    console.log('✅ Tailwind CSS v4 installed with lightningcss bindings\n');
  } catch (error) {
    console.error('❌ Failed to install Tailwind CSS:', error.message);
    process.exit(1);
  }

  // Remove CDN loader
  console.log('🗑️  Removing Tailwind CDN loader...');

  const loaderPath = path.join(__dirname, '..', 'components', 'tailwind-cdn-loader.tsx');
  console.log('📂 Replacing file:', loaderPath);

  // Remplacer complètement le fichier par un composant vide
  const emptyComponent = `'use client'

/**
 * Tailwind CSS v4 Loader (Vercel Build)
 *
 * This file was emptied by prebuild script (scripts/remove-cdn-for-vercel.js)
 * On Vercel, Tailwind v4 is compiled via lightningcss (no CDN needed)
 */
export function TailwindCDNLoader() {
  return null;
}
`;

  try {
    const originalContent = fs.readFileSync(loaderPath, 'utf-8');
    const originalSize = originalContent.length;

    fs.writeFileSync(loaderPath, emptyComponent);
    const newSize = emptyComponent.length;

    console.log('\n📊 Results:');
    console.log('   - Original size:', originalSize, 'bytes');
    console.log('   - New size:', newSize, 'bytes');
    console.log('   - Removed:', originalSize - newSize, 'bytes');
    console.log('\n✅ SUCCESS! CDN code removed from tailwind-cdn-loader.tsx');
    console.log('🚀 Vercel build will use compiled Tailwind v4 (no CDN)\n');
  } catch (error) {
    console.log('\n❌ ERROR:', error.message);
    console.log('   Build will continue but CDN might be present\n');
  }
} else {
  console.log('⏭️  Not on Vercel - skipping CDN removal');
  console.log('   (CDN will be used for CodeSandbox development)\n');
}