// Reads shared/fabledsword.tokens.json and emits lib/theme/tokens.dart.
// Run via `dart run tool/gen_tokens.dart`. The generated file is
// committed (CI validates it matches the JSON to catch drift).
import 'dart:convert';
import 'dart:io';

void main() {
  final jsonFile = File('shared/fabledsword.tokens.json');
  final tokens = jsonDecode(jsonFile.readAsStringSync()) as Map<String, dynamic>;
  final colors = (tokens['colors'] as Map).cast<String, String>();
  final radii  = (tokens['radii']  as Map).cast<String, String>();
  final fonts  = (tokens['fonts']  as Map).cast<String, String>();

  final out = StringBuffer()
    ..writeln('// GENERATED — do not edit. Source: shared/fabledsword.tokens.json')
    ..writeln('// Run `dart run tool/gen_tokens.dart` to regenerate.')
    ..writeln("import 'package:flutter/material.dart';")
    ..writeln()
    ..writeln('class FabledSwordTokens {');

  colors.forEach((name, hex) {
    final value = hex.replaceFirst('#', '0xFF');
    out.writeln('  static const Color ${_camel(name)} = Color($value);');
  });

  radii.forEach((name, px) {
    final v = px.replaceAll('px', '');
    out.writeln('  static const double radius${_pascal(name)} = $v;');
  });

  fonts.forEach((name, family) {
    out.writeln('  static const String font${_pascal(name)} = ${jsonEncode(family)};');
  });

  out.writeln('}');

  File('lib/theme/tokens.dart').writeAsStringSync(out.toString());
  stdout.writeln('wrote lib/theme/tokens.dart');
}

String _camel(String s) => s; // tokens are already lowerCamel-friendly
String _pascal(String s)  => s[0].toUpperCase() + s.substring(1);