import 'dart:io';
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:app_pfm_ocr_v2/features/camera/camera_screen.dart';
import 'package:app_pfm_ocr_v2/features/camera/image_preview_screen.dart';

void main() {
  testWidgets('CameraScreen navigation to ImagePreviewScreen test', (WidgetTester tester) async {
    // Generate a valid 1x1 PNG file in temp directory
    final tempDir = Directory.systemTemp.createTempSync();
    final tempFile = File('${tempDir.path}/test_image.png');
    final dummyPngBytes = [
      137, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13, 73, 72, 68, 82, 
      0, 0, 0, 1, 0, 0, 0, 1, 8, 6, 0, 0, 0, 31, 21, 196, 137, 
      0, 0, 0, 10, 73, 68, 65, 84, 120, 156, 99, 0, 1, 0, 0, 5, 
      0, 1, 13, 10, 45, 180, 0, 0, 0, 0, 73, 69, 78, 68, 174, 66, 96, 130
    ];
    tempFile.writeAsBytesSync(dummyPngBytes);

    // Build a mock version of the widget tree with a simple navigator
    await tester.pumpWidget(
      const ProviderScope(
        child: MaterialApp(
          home: Scaffold(
            body: CameraScreen(),
          ),
        ),
      ),
    );

    // Find the state of the CameraScreen
    final CameraScreenState state = tester.state(find.byType(CameraScreen));
    
    // Call the navigation method directly to test the routing
    state.navigateToPreview(tempFile.path);
    
    // Pump frames to allow navigation and async processing to complete
    await tester.pump();
    await tester.pump(const Duration(milliseconds: 500)); // Pushes preview screen
    await tester.pump(const Duration(seconds: 1));          // Waits for blur analysis to finish

    // Verify that the ImagePreviewScreen is now displayed on top of the navigator
    expect(find.byType(ImagePreviewScreen), findsOneWidget);

    // Cleanup
    try {
      tempFile.deleteSync();
      tempDir.deleteSync();
    } catch (_) {}
  });
}