#!/usr/bin/env node
/**
 * Build icons.svg — one inline SVG sprite combined from the Font Awesome Pro kit's
 * pre-built per-style sprites under node_modules/@awesome.me/kit-<id>/icons/sprites/.
 *
 * Symbol ids are namespaced `dw-<name>` (e.g. dw-house). Consumed via the dw_icon()
 * helper (inc/template.php) or directly: <svg class="dw-icon"><use href="#dw-house"></use></svg>.
 *
 * Run:  npm run icons   (also chained into `npm run build`).
 * The kit is the curated icon set, so the sprite is exactly the icons we use (~40, ~40 KB)
 * — replacing the 689 KB Font Awesome webfont.
 */
import { readFileSync, writeFileSync, readdirSync, existsSync } from 'node:fs';
import { resolve } from 'node:path';

const scope = 'node_modules/@awesome.me';
let kit;
try {
  kit = readdirSync(scope).find((d) => d.startsWith('kit-'));
} catch {
  /* scope missing */
}
if (!kit) {
  console.error('build-icons: no @awesome.me/kit-* installed — skipping (run `npm install` your FA kit first)');
  process.exit(0);
}

const spritesDir = resolve(scope, kit, 'icons/sprites');
const symbols = [];
const seen = new Set();

for (const file of readdirSync(spritesDir).filter((f) => f.endsWith('.svg'))) {
  const svg = readFileSync(resolve(spritesDir, file), 'utf8');
  for (const m of svg.matchAll(/<symbol id="([^"]+)"([\s\S]*?)<\/symbol>/g)) {
    const name = m[1];
    if (seen.has(name)) continue; // first style wins on a name clash
    seen.add(name);
    symbols.push(`<symbol id="dw-${name}"${m[2]}</symbol>`);
  }
}

// Custom local icons (non-FA, e.g. Bootstrap Icons) live in bin/custom-icons/*.svg.
// Merged here so they survive a kit rebuild; filename (minus .svg) is the icon name.
const customDir = resolve('bin/custom-icons');
if (existsSync(customDir)) {
  for (const file of readdirSync(customDir).filter((f) => f.endsWith('.svg'))) {
    const name = file.replace(/\.svg$/, '');
    if (seen.has(name)) continue; // kit wins on a name clash
    seen.add(name);
    const svg = readFileSync(resolve(customDir, file), 'utf8');
    const viewBox = (svg.match(/viewBox="([^"]+)"/) || [, '0 0 16 16'])[1];
    const inner = svg.replace(/[\s\S]*?<svg[^>]*>/, '').replace(/<\/svg>[\s\S]*/, '').trim();
    symbols.push(`<symbol id="dw-${name}" viewBox="${viewBox}" fill="currentColor">${inner}</symbol>`);
  }
}

symbols.sort();
const sprite =
  '<svg xmlns="http://www.w3.org/2000/svg" style="display:none" aria-hidden="true">\n' +
  symbols.join('\n') +
  '\n</svg>\n';

writeFileSync('icons.svg', sprite);
console.log(`build-icons: wrote icons.svg — ${symbols.length} icons from ${kit}`);