import 'dart:math' as math;
import 'package:flutter/material.dart';
import 'package:mobile_scanner/mobile_scanner.dart';
import 'package:lba/res/colors.dart';
import '../services/location_service.dart';

class HintCameraWidget extends StatefulWidget {
  final double targetLatitude;
  final double targetLongitude;
  final String hintDescription;
  final VoidCallback onHintFound;
  final VoidCallback onClose;

  const HintCameraWidget({
    super.key,
    required this.targetLatitude,
    required this.targetLongitude,
    required this.hintDescription,
    required this.onHintFound,
    required this.onClose,
  });

  @override
  State<HintCameraWidget> createState() => _HintCameraWidgetState();
}

class _HintCameraWidgetState extends State<HintCameraWidget>
    with TickerProviderStateMixin {
  MobileScannerController? _controller;
  bool _isScanning = true;
  bool _hintFound = false;
  late AnimationController _pulseController;
  late AnimationController _scanController;
  late Animation<double> _pulseAnimation;
  late Animation<double> _scanAnimation;

  @override
  void initState() {
    super.initState();
    _initializeCamera();
    _setupAnimations();
    _checkLocationPeriodically();
  }

  void _setupAnimations() {
    _pulseController = AnimationController(
      duration: const Duration(milliseconds: 1500),
      vsync: this,
    );
    _scanController = AnimationController(
      duration: const Duration(milliseconds: 2000),
      vsync: this,
    );

    _pulseAnimation = Tween<double>(
      begin: 0.8,
      end: 1.2,
    ).animate(CurvedAnimation(
      parent: _pulseController,
      curve: Curves.easeInOut,
    ));

    _scanAnimation = Tween<double>(
      begin: 0.0,
      end: 1.0,
    ).animate(CurvedAnimation(
      parent: _scanController,
      curve: Curves.linear,
    ));

    _pulseController.repeat(reverse: true);
    _scanController.repeat();
  }

  void _initializeCamera() async {
    try {
      _controller = MobileScannerController(
        detectionSpeed: DetectionSpeed.noDuplicates,
        facing: CameraFacing.back,
      );
    } catch (e) {
      // Handle camera initialization error
    }
  }

  void _checkLocationPeriodically() async {
    while (_isScanning && !_hintFound) {
      await Future.delayed(const Duration(seconds: 2));
      if (!mounted) break;

      final position = await LocationService.getCurrentPosition();
      if (position != null) {
        final isNearTarget = LocationService.isWithinRange(
          position.latitude,
          position.longitude,
          widget.targetLatitude,
          widget.targetLongitude,
          rangeInMeters: 100.0, // 100 meters range for hints
        );

        if (isNearTarget && !_hintFound) {
          setState(() {
            _hintFound = true;
          });
          widget.onHintFound();
          break;
        }
      }
    }
  }

  @override
  void dispose() {
    _controller?.dispose();
    _pulseController.dispose();
    _scanController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          onPressed: widget.onClose,
          icon: const Icon(
            Icons.close_rounded,
            color: Colors.white,
            size: 28,
          ),
        ),
        title: Text(
          'AR Hint Scanner',
          style: TextStyle(
            color: Colors.white,
            fontSize: 18,
            fontWeight: FontWeight.w600,
          ),
        ),
        centerTitle: true,
      ),
      body: Stack(
        children: [
          // Camera view
          if (_controller != null)
            MobileScanner(
              controller: _controller!,
              onDetect: (capture) {
                // Handle any QR code detection if needed
              },
            )
          else
            Container(
              color: Colors.black,
              child: const Center(
                child: CircularProgressIndicator(color: Colors.white),
              ),
            ),

          // AR Overlay
          _buildAROverlay(),

          // Hint status
          _buildHintStatus(),

          // Instructions
          _buildInstructions(),
        ],
      ),
    );
  }

  Widget _buildAROverlay() {
    return CustomPaint(
      painter: AROverlayPainter(
        scanAnimation: _scanAnimation,
        pulseAnimation: _pulseAnimation,
        hintFound: _hintFound,
      ),
      size: Size.infinite,
    );
  }

  Widget _buildHintStatus() {
    return Positioned(
      top: 100,
      left: 20,
      right: 20,
      child: Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: Colors.black.withOpacity(0.7),
          borderRadius: BorderRadius.circular(12),
        ),
        child: Column(
          children: [
            Icon(
              _hintFound ? Icons.check_circle : Icons.search,
              color: _hintFound ? Colors.green : Colors.orange,
              size: 32,
            ),
            const SizedBox(height: 8),
            Text(
              _hintFound ? 'Hint Found!' : 'Searching for AR Marker...',
              style: const TextStyle(
                color: Colors.white,
                fontSize: 16,
                fontWeight: FontWeight.w600,
              ),
              textAlign: TextAlign.center,
            ),
            if (_hintFound) ...[
              const SizedBox(height: 8),
              Text(
                widget.hintDescription,
                style: const TextStyle(
                  color: Colors.white70,
                  fontSize: 14,
                ),
                textAlign: TextAlign.center,
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _buildInstructions() {
    return Positioned(
      bottom: 50,
      left: 20,
      right: 20,
      child: Container(
        padding: const EdgeInsets.all(20),
        decoration: BoxDecoration(
          color: Colors.black.withOpacity(0.8),
          borderRadius: BorderRadius.circular(16),
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(
              Icons.center_focus_strong,
              color: AppColors.primary,
              size: 40,
            ),
            const SizedBox(height: 12),
            Text(
              'Point your camera at the environment',
              style: const TextStyle(
                color: Colors.white,
                fontSize: 16,
                fontWeight: FontWeight.w600,
              ),
              textAlign: TextAlign.center,
            ),
            const SizedBox(height: 8),
            Text(
              'Move closer to the target location\nto discover the AR hint marker',
              style: const TextStyle(
                color: Colors.white70,
                fontSize: 14,
                height: 1.4,
              ),
              textAlign: TextAlign.center,
            ),
          ],
        ),
      ),
    );
  }
}

class AROverlayPainter extends CustomPainter {
  final Animation<double> scanAnimation;
  final Animation<double> pulseAnimation;
  final bool hintFound;

  AROverlayPainter({
    required this.scanAnimation,
    required this.pulseAnimation,
    required this.hintFound,
  });

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = hintFound ? Colors.green : Colors.blue
      ..style = PaintingStyle.stroke
      ..strokeWidth = 3.0;

    final center = Offset(size.width / 2, size.height / 2);
    final radius = 80.0;

    // Draw scanning circle
    if (!hintFound) {
      canvas.drawCircle(
        center,
        radius * pulseAnimation.value,
        paint..color = Colors.blue.withOpacity(0.6),
      );

      // Draw scanning line
      const sweepAngle = math.pi / 3;
      final startAngle = scanAnimation.value * 2 * math.pi;
      
      paint
        ..color = Colors.cyan
        ..strokeWidth = 2.0
        ..style = PaintingStyle.stroke;

      canvas.drawArc(
        Rect.fromCircle(center: center, radius: radius),
        startAngle,
        sweepAngle,
        false,
        paint,
      );
    } else {
      // Draw found indicator
      paint
        ..color = Colors.green
        ..style = PaintingStyle.fill;

      canvas.drawCircle(
        center,
        20 * pulseAnimation.value,
        paint..color = Colors.green.withOpacity(0.3),
      );

      canvas.drawCircle(
        center,
        10,
        paint..color = Colors.green,
      );

      // Draw checkmark
      paint
        ..color = Colors.white
        ..strokeWidth = 3.0
        ..style = PaintingStyle.stroke
        ..strokeCap = StrokeCap.round;

      final path = Path();
      path.moveTo(center.dx - 5, center.dy);
      path.lineTo(center.dx - 2, center.dy + 3);
      path.lineTo(center.dx + 5, center.dy - 3);

      canvas.drawPath(path, paint);
    }

    // Draw corner brackets
    _drawCornerBrackets(canvas, size);
  }

  void _drawCornerBrackets(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.white.withOpacity(0.8)
      ..strokeWidth = 2.0
      ..style = PaintingStyle.stroke;

    const bracketSize = 30.0;
    const margin = 50.0;

    // Top-left
    canvas.drawLine(
      Offset(margin, margin),
      Offset(margin + bracketSize, margin),
      paint,
    );
    canvas.drawLine(
      Offset(margin, margin),
      Offset(margin, margin + bracketSize),
      paint,
    );

    // Top-right
    canvas.drawLine(
      Offset(size.width - margin, margin),
      Offset(size.width - margin - bracketSize, margin),
      paint,
    );
    canvas.drawLine(
      Offset(size.width - margin, margin),
      Offset(size.width - margin, margin + bracketSize),
      paint,
    );

    // Bottom-left
    canvas.drawLine(
      Offset(margin, size.height - margin),
      Offset(margin + bracketSize, size.height - margin),
      paint,
    );
    canvas.drawLine(
      Offset(margin, size.height - margin),
      Offset(margin, size.height - margin - bracketSize),
      paint,
    );

    // Bottom-right
    canvas.drawLine(
      Offset(size.width - margin, size.height - margin),
      Offset(size.width - margin - bracketSize, size.height - margin),
      paint,
    );
    canvas.drawLine(
      Offset(size.width - margin, size.height - margin),
      Offset(size.width - margin, size.height - margin - bracketSize),
      paint,
    );
  }

  @override
  bool shouldRepaint(covariant CustomPainter oldDelegate) => true;
}