/// EmptyState widget 测试（UI-01 Task 3）。
///
/// 覆盖：图标 + 标题 + 说明 + 可选操作按钮全量渲染；操作回调触发；
/// 无说明/无按钮时不占位。
library;

import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:photo_live/app/theme.dart';
import 'package:photo_live/ui/components/empty_state.dart';

void main() {
  Future<void> pumpState(
    WidgetTester tester, {
    String? subtitle,
    String? actionLabel,
    VoidCallback? onAction,
  }) {
    return tester.pumpWidget(
      MaterialApp(
        theme: AppTheme.light,
        home: Scaffold(
          body: EmptyState(
            icon: Icons.photo_library_outlined,
            title: 'No albums yet',
            subtitle: subtitle,
            actionLabel: actionLabel,
            onAction: onAction,
          ),
        ),
      ),
    );
  }

  testWidgets('渲染图标 + 标题 + 说明 + 操作按钮', (tester) async {
    var taps = 0;
    await pumpState(
      tester,
      subtitle: 'Create one to get started',
      actionLabel: 'Create album',
      onAction: () => taps++,
    );

    expect(find.byIcon(Icons.photo_library_outlined), findsOneWidget);
    expect(find.text('No albums yet'), findsOneWidget);
    expect(find.text('Create one to get started'), findsOneWidget);
    expect(find.text('Create album'), findsOneWidget);

    await tester.tap(find.text('Create album'));
    expect(taps, 1, reason: '操作回调触发');
  });

  testWidgets('无说明/无按钮 → 仅图标与标题', (tester) async {
    await pumpState(tester);

    expect(find.byIcon(Icons.photo_library_outlined), findsOneWidget);
    expect(find.text('No albums yet'), findsOneWidget);
    expect(find.byType(FilledButton), findsNothing);
  });
}