// Author: fruit.com.cn
// 为界面视觉复核加载项目字体并导出测试渲染图。

import 'dart:io';
import 'dart:ui' as ui;

import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';

const double _capturePixelRatio = 3;

/// 为可选截图使用实际字体，不影响普通测试执行。
Future<void> loadCaptureFonts(WidgetTester tester) async {
  await tester.runAsync(() async {
    final fonts = {
      'Outfit': [
        'Outfit-Regular.ttf',
        'Outfit-SemiBold.ttf',
        'Outfit-Bold.ttf',
      ],
      'PlusJakartaSans': [
        'PlusJakartaSans-Regular.ttf',
        'PlusJakartaSans-Medium.ttf',
        'PlusJakartaSans-SemiBold.ttf',
        'PlusJakartaSans-Bold.ttf',
      ],
      // 测试默认字体仅作占位，截图使用项目正文字体替换。
      'Ahem': ['PlusJakartaSans-Regular.ttf'],
    };
    for (final family in fonts.entries) {
      final loader = FontLoader(family.key);
      for (final asset in family.value) {
        loader.addFont(rootBundle.load('assets/fonts/$asset'));
      }
      await loader.load();
    }
    final icons = FontLoader('MaterialIcons');
    icons.addFont(rootBundle.load('fonts/MaterialIcons-Regular.otf'));
    await icons.load();
  });
}

/// 导出指定边界的渲染结果，图片为测试产物而非界面资源。
Future<void> saveWidgetCapture(
  WidgetTester tester,
  Key boundaryKey,
  String path,
) async {
  final boundary = tester.renderObject<RenderRepaintBoundary>(
    find.byKey(boundaryKey),
  );
  await tester.runAsync(() async {
    final image = await boundary.toImage(pixelRatio: _capturePixelRatio);
    final bytes = await image.toByteData(format: ui.ImageByteFormat.png);
    if (bytes == null) throw StateError('Screenshot encoding failed');
    await File(path).writeAsBytes(bytes.buffer.asUint8List());
    image.dispose();
  });
}