/**
 * SUMI Design System — Style Dictionary configuration
 *
 * Source : tokens/primitive/*.json + tokens/semantic/*.json (W3C tokens spec)
 * Outputs :
 *   - dist/tokens.css         (concat of primitive + dark + light themes)
 *   - dist/tokens-primitive.css
 *   - dist/tokens-dark.css    (selector :root, [data-theme="dark"])
 *   - dist/tokens-light.css   (selector [data-theme="light"])
 *   - dist/tokens.ts          (TS exports — values resolved against dark theme)
 *
 * SOURCE OF TRUTH = tokens/*.json
 * Do NOT edit dist/* manually — they are generated. Edit tokens/* and run `npm run build:tokens`.
 *
 * Charte : ../../../Documents/TG__Talas_Group/05_EXPERIENCE_UTILISATEUR/CHARTE_GRAPHIQUE_TALAS.md
 */

import StyleDictionary from 'style-dictionary';
import { readFileSync, writeFileSync } from 'node:fs';

const PRIMITIVE_GLOB = 'tokens/primitive/**/*.json';
const SEMANTIC_DARK = 'tokens/semantic/dark.json';
const SEMANTIC_LIGHT = 'tokens/semantic/light.json';

/** Filter that keeps only tokens whose path starts with one of `prefixes`. */
const filterByPathPrefix = (prefixes) => (token) => prefixes.includes(token.path[0]);

/** Build primitive tokens — :root only (raw values shared by all themes). */
const buildPrimitive = async () => {
  const sd = new StyleDictionary({
    source: [PRIMITIVE_GLOB],
    platforms: {
      css: {
        transformGroup: 'css',
        buildPath: 'dist/',
        files: [
          {
            destination: 'tokens-primitive.css',
            format: 'css/variables',
            options: { selector: ':root', outputReferences: false },
          },
        ],
      },
    },
  });
  await sd.buildAllPlatforms();
};

/** Build a theme — semantic tokens with theme selector. */
const buildTheme = async (themeName, semanticFile, selector) => {
  const sd = new StyleDictionary({
    source: [PRIMITIVE_GLOB, semanticFile],
    platforms: {
      css: {
        transformGroup: 'css',
        buildPath: 'dist/',
        files: [
          {
            destination: `tokens-${themeName}.css`,
            format: 'css/variables',
            filter: filterByPathPrefix(['sumi']),
            options: { selector, outputReferences: true },
          },
        ],
      },
    },
  });
  await sd.buildAllPlatforms();
};

/** Build TS exports — values resolved against dark theme (default). */
const buildTypeScript = async () => {
  const sd = new StyleDictionary({
    source: [PRIMITIVE_GLOB, SEMANTIC_DARK],
    platforms: {
      ts: {
        transformGroup: 'js',
        buildPath: 'dist/',
        files: [
          {
            destination: 'tokens.ts',
            format: 'javascript/es6',
          },
          {
            destination: 'tokens.d.ts',
            format: 'typescript/es6-declarations',
          },
        ],
      },
    },
  });
  await sd.buildAllPlatforms();
};

await buildPrimitive();
await buildTheme('dark', SEMANTIC_DARK, ':root, [data-theme="dark"]');
await buildTheme('light', SEMANTIC_LIGHT, '[data-theme="light"]');
await buildTypeScript();

// Concatenate the three CSS files into a single tokens.css
const header = `/**
 * SUMI tokens — generated by style-dictionary.config.mjs
 * Source: packages/design-system/tokens/
 * Do NOT edit this file. Edit tokens/*.json and run \`npm run build:tokens\`.
 */

`;
const primitive = readFileSync('dist/tokens-primitive.css', 'utf8');
const dark = readFileSync('dist/tokens-dark.css', 'utf8');
const light = readFileSync('dist/tokens-light.css', 'utf8');
const stripGenerated = (s) => s.replace(/^\/\*\*\n \* Do not edit directly[\s\S]*?\*\/\n\n?/m, '');
writeFileSync(
  'dist/tokens.css',
  header + stripGenerated(primitive) + '\n' + stripGenerated(dark) + '\n' + stripGenerated(light),
);

console.log('\n✓ Style Dictionary build complete.');
console.log('  Output: packages/design-system/dist/');
console.log('   - tokens.css (unified)');
console.log('   - tokens-primitive.css, tokens-dark.css, tokens-light.css');
console.log('   - tokens.ts, tokens.d.ts');