<?php
/**
 * One-shot generator for src/Icons/fa5-icons.php.
 *
 * Sources (shipped with the theme):
 *  - assets/fontawesome5/css/all.min.css            → glyph class names + codepoints
 *  - assets/fontawesome5/webfonts/fa-*.svg          → per-style glyph codepoints
 *
 * Usage: php tools/generate-fa5-icons.php
 */

defined('ABSPATH') || define('ABSPATH', __DIR__ . '/');

$root       = dirname(__DIR__);
$css_path   = $root . '/assets/fontawesome5/css/all.min.css';
$fonts_path = $root . '/assets/fontawesome5/webfonts';
$out_path   = $root . '/src/Icons/fa5-icons.php';

$css = (string) file_get_contents($css_path);

// class name → codepoint (e.g. 'home' => 0xf015)
$name_to_code = [];
if (!preg_match_all('/\.fa-([a-z0-9-]+):before\{content:"\\\\([0-9a-f]{4})"\}/i', $css, $m, PREG_SET_ORDER)) {
	fwrite(STDERR, "No glyph rules matched in all.min.css\n");
	exit(1);
}
foreach ($m as $hit) {
	$name_to_code[$hit[1]] = hexdec($hit[2]);
}

// style → set of codepoints, parsed from the SVG font files
$code_to_style = ['fas' => [], 'far' => [], 'fab' => []];
foreach (array_keys($code_to_style) as $style) {
	$file = $fonts_path . '/fa-' . ($style === 'fab' ? 'brands-400' : ($style === 'far' ? 'regular-400' : 'solid-900')) . '.svg';
	$src  = (string) file_get_contents($file);
	if (!preg_match_all('/<glyph[^>]*unicode="&#x([0-9a-f]+);"/i', $src, $g, PREG_SET_ORDER)) {
		fwrite(STDERR, "No glyphs matched in {$file}\n");
		exit(1);
	}
	foreach ($g as $hit) {
		$code_to_style[$style][hexdec($hit[1])] = true;
	}
}

$groups = ['fas' => [], 'far' => [], 'fab' => []];
foreach ($name_to_code as $name => $code) {
	foreach ($groups as $style => $unused) {
		if (!empty($code_to_style[$style][$code])) {
			$groups[$style][] = $name;
		}
	}
}
foreach ($groups as $style => $names) {
	sort($groups[$style], SORT_NATURAL | SORT_FLAG_CASE);
}

$export = var_export($groups, true);

$php = <<<PHP
<?php
/**
 * Font Awesome 5 Free (5.15.4) icon catalog, grouped by style.
 *
 * Generated by tools/generate-fa5-icons.php — do not edit by hand.
 * Bare glyph names; the picker composes "fa {fas|far|fab} fa-{name}".
 *
 * @package AKSRT
 */

defined('ABSPATH') || exit;

return {$export}
PHP;

file_put_contents($out_path, $php . ";\n");

printf(
	"fas=%d far=%d fab=%d (css glyph classes=%d)\nWrote %s\n",
	count($groups['fas']),
	count($groups['far']),
	count($groups['fab']),
	count($name_to_code),
	$out_path
);