/**
 * Style Dictionary configuration for FA Design System (v4)
 *
 * Transforms W3C DTCG token JSON into:
 * - CSS custom properties (for runtime theming)
 * - JavaScript ES6 module (for MUI theme consumption)
 * - JSON (for Penpot import)
 */

import StyleDictionary from 'style-dictionary';

const sd = new StyleDictionary({
  source: ['tokens/**/*.json'],
  usesDtcg: true,

  platforms: {
    // CSS custom properties
    css: {
      transformGroup: 'css',
      prefix: 'fa',
      buildPath: 'src/theme/generated/',
      files: [{
        destination: 'tokens.css',
        format: 'css/variables',
        options: {
          outputReferences: true,
        },
      }],
    },

    // JavaScript ES6 module for MUI theme
    js: {
      transformGroup: 'js',
      buildPath: 'src/theme/generated/',
      files: [{
        destination: 'tokens.js',
        format: 'javascript/es6',
      }],
    },

    // Flat JSON for Penpot import and other tools
    json: {
      transformGroup: 'js',
      buildPath: 'tokens/export/',
      files: [{
        destination: 'tokens-flat.json',
        format: 'json/flat',
      }],
    },
  },
});

await sd.buildAllPlatforms();

// Generate TypeScript declarations for the JS token output
import { readFileSync, writeFileSync } from 'fs';

const jsPath = 'src/theme/generated/tokens.js';
const dtsPath = 'src/theme/generated/tokens.d.ts';

const jsContent = readFileSync(jsPath, 'utf-8')
  .replace(/=\n\s+/g, '= '); // join continuation lines

const declarations = ['/**', ' * Do not edit directly, this file was auto-generated.', ' */'];

for (const line of jsContent.split('\n')) {
  const m = line.match(/^export const (\w+)\s*=\s*(.+?)\s*;/);
  if (!m) continue;
  const [, name, val] = m;
  const isNum = !val.startsWith('"') && !val.startsWith("'") && !isNaN(Number(val));
  declarations.push(`export declare const ${name}: ${isNum ? 'number' : 'string'};`);
}

writeFileSync(dtsPath, declarations.join('\n') + '\n');
console.log(`✓ Generated ${declarations.length - 3} TypeScript declarations`);