#!/usr/bin/env node
/**
 * Build the frontend SVG sprite from the single source of truth.
 *
 * Source: assets/icons/sprite/{key}.svg — one 1024x1024 icon per file.
 *         The file name (without .svg) is the sprite key used by
 *         aksrt_icon_markup('zibsvg-{key}') and <use xlink:href="#icon-{key}">.
 * Output: assets/js/runtime/svg-icon.js — aksrt_svgs['key'] = '<path…>' map
 *         plus the runtime that injects <symbol> definitions into the page.
 *
 * Usage:  node tools/build-svg-sprite.mjs
 *
 * Rules for new icons:
 *  - viewBox must be "0 0 1024 1024" (the runtime hardcodes it on <symbol>).
 *  - File name: lowercase letters, digits, "-" or "_".
 *  - Only the inner markup of <svg> is kept; editor metadata (p-id, t, class,
 *    width/height, XML prolog, DOCTYPE) is stripped.
 */
import { readdirSync, readFileSync, writeFileSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = join(dirname(fileURLToPath(import.meta.url)), '..');
const srcDir = join(root, 'assets/icons/sprite');
const outFile = join(root, 'assets/js/runtime/svg-icon.js');

const files = readdirSync(srcDir).filter((f) => f.endsWith('.svg')).sort();
const errors = [];
const entries = [];

for (const file of files) {
  const key = file.slice(0, -4);
  if (!/^[a-z0-9_-]+$/.test(key)) {
    errors.push(`${file}: invalid key (use a-z, 0-9, "-" or "_")`);
    continue;
  }
  const raw = readFileSync(join(srcDir, file), 'utf8');
  const open = raw.match(/<svg\b[^>]*>/i);
  const close = raw.lastIndexOf('</svg>');
  if (!open || close < 0) {
    errors.push(`${file}: missing <svg> root`);
    continue;
  }
  const viewBox = (open[0].match(/viewBox="([^"]*)"/i) || [])[1];
  if (viewBox !== '0 0 1024 1024') {
    errors.push(`${file}: viewBox must be "0 0 1024 1024" (got ${viewBox ?? 'none'})`);
    continue;
  }
  const inner = raw
    .slice(open.index + open[0].length, close)
    .replace(/\s+p-id="[^"]*"/g, '')
    .replace(/\r?\n\s*/g, '')
    .trim();
  if (inner === '') {
    errors.push(`${file}: empty icon`);
    continue;
  }
  if (/[\\']/.test(inner)) {
    errors.push(`${file}: contains a backslash or single quote`);
    continue;
  }
  entries.push(`aksrt_svgs['${key}'] = '${inner}';`);
}

if (errors.length) {
  console.error(errors.join('\n'));
  process.exit(1);
}

const runtime = `
function show_svg() {
    jQuery('[data-svg]').each(function () {
        var _t = jQuery(this),
            viewbox = _t.attr('data-viewbox'),
            svgclass = _t.attr('data-class'),
            svgname = _t.attr('data-svg'),
            svg_html = '<svg class="' + svgclass + '" viewBox="' + viewbox + '">' + aksrt_svgs[svgname] + '</svg>';
        _t.html(svg_html);
    });
}

!(function () {
    var svg = '';
    for (let key in aksrt_svgs) {
        svg += aksrt_svgs[key] ? '<symbol id="icon-' + key + '" viewBox="0 0 1024 1024">' + aksrt_svgs[key] + '</symbol>' : '';
    }

    var i = '<svg id="svg-icons" aria-hidden="true" style="position:absolute;width:0px;height:0px;overflow:hidden;">' + svg + '</svg>';
    if (!jQuery('svg#svg-icons').length) {
        jQuery('body').prepend(i);
    }
})(window);
`;

const header = `/* Generated by tools/build-svg-sprite.mjs from assets/icons/sprite/*.svg — do not edit by hand. */\n'use strict';\nvar aksrt_svgs = [];\n`;
writeFileSync(outFile, header + entries.join('\n') + '\n' + runtime);
console.log(`Built ${entries.length} sprite icons -> assets/js/runtime/svg-icon.js`);