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

void main() {
  testWidgets('CameraScreen coordinates capture and preview navigation test', (WidgetTester tester) async {
    // Inject mock coordinates
    final mockPos = Position(
      latitude: -6.2000,
      longitude: 106.8000,
      timestamp: DateTime.now(),
      accuracy: 1.0,
      altitude: 10.0,
      altitudeAccuracy: 1.0,
      heading: 0.0,
      headingAccuracy: 1.0,
      speed: 0.0,
      speedAccuracy: 1.0,
    );
    LocationService.mockDeterminator = () async => mockPos;
    LocationService.mockStream = Stream.value(mockPos);

    // Create a dummy image file in temp directory
    final tempDir = Directory.systemTemp.createTempSync();
    final tempFile = File('${tempDir.path}/test_location_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 the widget tree
    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 with coordinates
    state.navigateToPreview(
      tempFile.path, 
      latitude: mockPos.latitude, 
      longitude: mockPos.longitude,
    );
    
    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 displayed and has coordinates
    final previewFinder = find.byType(ImagePreviewScreen);
    expect(previewFinder, findsOneWidget);

    final ImagePreviewScreen previewWidget = tester.widget(previewFinder);
    expect(previewWidget.latitude, equals(-6.2000));
    expect(previewWidget.longitude, equals(106.8000));

    // Cleanup
    try {
      tempFile.deleteSync();
      tempDir.deleteSync();
    } catch (_) {}
    LocationService.mockDeterminator = null;
    LocationService.mockStream = null;
  });
}