#!/usr/bin/env node
/**
 * Build-time SVG Symbol Injector
 * Injects external SVG symbols into HTML files during build
 * Usage: node inject-symbols.js input.html output.html symbols.svg
 */

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

function injectSymbols(htmlFile, outputFile, symbolFile) {
  try {
    // Read files
    const htmlContent = fs.readFileSync(htmlFile, 'utf8');
    const symbolContent = fs.readFileSync(symbolFile, 'utf8');

    // Extract symbols from SVG (remove outer svg tags)
    const symbolsOnly = symbolContent
      .replace(/<\?xml[^>]*\?>/, '')
      .replace(/<svg[^>]*>/, '')
      .replace(/<\/svg>$/, '')
      .trim();

    // Inject symbols before closing body tag
    const injectedHtml = htmlContent.replace(
      '</body>',
      `    ${symbolsOnly}\n</body>`
    );

    // Write output
    fs.writeFileSync(outputFile, injectedHtml);
    console.log(`✅ Symbols injected: ${htmlFile} → ${outputFile}`);
  } catch (error) {
    console.error('❌ Error injecting symbols:', error.message);
    process.exit(1);
  }
}

// Command line usage
if (require.main === module) {
  const [,, htmlFile, outputFile, symbolFile] = process.argv;

  if (!htmlFile || !outputFile || !symbolFile) {
    console.log('Usage: node inject-symbols.js <input.html> <output.html> <symbols.svg>');
    process.exit(1);
  }

  injectSymbols(htmlFile, outputFile, symbolFile);
}

module.exports = injectSymbols;