import 'package:flutter/material.dart';
import 'app_tokens.g.dart';

ThemeData buildTheme(String key) {
  final t = appTokensOf(key);
  final brightness = t.isDark ? Brightness.dark : Brightness.light;
  final scheme = ColorScheme.fromSeed(
    seedColor: t.primary,
    brightness: brightness,
  ).copyWith(
    primary: t.primary,
    onPrimary: t.onPrimary,
    surface: t.surface,
    error: t.danger,
  );
  return ThemeData(
    useMaterial3: true,
    brightness: brightness,
    colorScheme: scheme,
    scaffoldBackgroundColor: t.bg,
    // 字体走系统默认（macOS/iOS=PingFang SC，与原型 --font 一致）；不强制 Noto。
    // Noto 仅 golden 测试加载（CI 无中文字体），见 test/support/golden_harness.dart。
    extensions: <ThemeExtension<dynamic>>[t],
  );
}