import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:jiu_client/core/theme/themes.dart';

/// design-distill 阶段4（Flutter 端）可复用 golden 骨架。
/// 在指定主题 / viewport 下渲染 [child]（含 provider 覆盖），比对/更新 golden。
///
/// 验收分两类闸（见 ~/.claude/skills/design-distill/references/flutter-golden.md）：
/// - 保真：原型基准 vs 本 golden 用 montage.mjs 人工目检（跨渲染器，不跑严格 diff）。
/// - 回归：本 golden 多主题入库，CI `flutter test` 同渲染器自比抓串色/漏 token。
///
/// 更新基准：flutter test --update-goldens test/golden/<x>_golden_test.dart
///
/// 坑（详见 reference）：viewport 逻辑尺寸 = physical ÷ dpr（已按 logical*dpr 设好）；
/// 高度给足防 RenderFlex 溢出；测试无中文字体 → CJK 显示豆腐块属正常。
Future<void> pumpGolden(
  WidgetTester tester, {
  required Widget child,
  required String theme,
  required String goldenName,
  List<Override> overrides = const [],
  Size logical = const Size(1280, 900),
  double dpr = 2.0,
}) async {
  tester.view.physicalSize = Size(logical.width * dpr, logical.height * dpr);
  tester.view.devicePixelRatio = dpr;
  addTearDown(tester.view.resetPhysicalSize);
  addTearDown(tester.view.resetDevicePixelRatio);

  await tester.pumpWidget(ProviderScope(
    overrides: overrides,
    child: MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: buildTheme(theme),
      home: child,
    ),
  ));
  await tester.pumpAndSettle();

  await expectLater(
    find.byType(MaterialApp),
    matchesGoldenFile('goldens/$goldenName.png'),
  );
}

/// 跑「同一 child × A/B/C 三主题」的 golden 组（回归闸常用）。
void goldenAcrossThemes(
  String description, {
  required Widget Function() child,
  required String goldenPrefix,
  List<Override> Function()? overrides,
  Size logical = const Size(1280, 900),
  double dpr = 2.0,
}) {
  for (final theme in const ['a', 'b', 'c']) {
    testWidgets('$description · theme $theme', (tester) async {
      await pumpGolden(
        tester,
        child: child(),
        theme: theme,
        goldenName: '${goldenPrefix}_$theme',
        overrides: overrides?.call() ?? const [],
        logical: logical,
        dpr: dpr,
      );
    });
  }
}