import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/flutter_svg.dart';
import 'dart:async';
import 'dart:io';
import '../../core/error/exceptions.dart';

class OvalCameraCapturePage extends StatefulWidget {
  final bool isLogin;
  final Future<void> Function(File image) onCapture;

  const OvalCameraCapturePage({
    super.key,
    this.isLogin = true,
    required this.onCapture,
  });

  @override
  State<OvalCameraCapturePage> createState() => _OvalCameraCapturePageState();
}

class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
  CameraController? _cameraController;
  bool _isCameraInitialized = false;
  String? _errorMessage;
  bool _isSuccess = false;
  bool _isLoading = false;
  Timer? _timer;

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

  Future<void> _initializeCamera() async {
    try {
      setState(() {
        _errorMessage = null;
        _isCameraInitialized = false;
      });

      // Dispose existing controller if any
      await _cameraController?.dispose();
      _cameraController = null;

      // Get available cameras
      final cameras = await availableCameras();

      // Check if cameras list is available
      if (cameras.isEmpty) {
        if (!mounted) return;
        setState(() {
          _errorMessage = "لا توجد كاميرات متاحة على هذا الجهاز";
          _isCameraInitialized = false;
        });
        return;
      }

      // Try to find front camera, fallback to first available camera
      CameraDescription? selectedCamera;
      try {
        selectedCamera = cameras.firstWhere(
          (cam) => cam.lensDirection == CameraLensDirection.front,
        );
      } catch (e) {
        // If no front camera found, use the first available camera
        if (cameras.isNotEmpty) {
          selectedCamera = cameras.first;
        } else {
          if (!mounted) return;
          setState(() {
            _errorMessage = "لا توجد كاميرات متاحة على هذا الجهاز";
            _isCameraInitialized = false;
          });
          return;
        }
      }

      _cameraController = CameraController(
        selectedCamera,
        ResolutionPreset.medium,
        enableAudio: false,
        imageFormatGroup: ImageFormatGroup.jpeg,
      );

      await _cameraController!.initialize();

      if (!mounted) return;

      setState(() {
        _isCameraInitialized = true;
        _errorMessage = null;
      });

      _startScan();
    } on CameraException catch (e) {
      if (!mounted) return;
      String errorMessage;
      switch (e.code) {
        case 'CameraAccessDenied':
          errorMessage = "تم رفض الوصول إلى الكاميرا. يرجى السماح بالوصول في الإعدادات";
          break;
        case 'CameraAccessDeniedWithoutPrompt':
          errorMessage = "تم رفض الوصول إلى الكاميرا. يرجى السماح بالوصول في الإعدادات";
          break;
        case 'CameraAccessRestricted':
          errorMessage = "الوصول إلى الكاميرا مقيد";
          break;
        case 'AudioAccessDenied':
          errorMessage = "تم رفض الوصول إلى الميكروفون";
          break;
        default:
          errorMessage = "خطأ في تهيئة الكاميرا: ${e.description ?? 'خطأ غير معروف'}";
      }
      setState(() {
        _errorMessage = errorMessage;
        _isCameraInitialized = false;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() {
        _errorMessage = "حدث خطأ غير متوقع أثناء تهيئة الكاميرا";
        _isCameraInitialized = false;
      });
      print("Error initializing camera: $e");
    }
  }

  Future<void> _startScan() async {
    try {
      setState(() {
        _isLoading = true;
        _errorMessage = null;
      });

      // Simulate scanning delay
      await Future.delayed(const Duration(seconds: 2));

      if (!mounted ||
          _cameraController == null ||
          !_cameraController!.value.isInitialized) {
        if (mounted) {
          setState(() {
            _isLoading = false;
            _errorMessage = "الكاميرا غير مهيأة. يرجى المحاولة مرة أخرى";
          });
        }
        return;
      }

      final xFile = await _cameraController!.takePicture();
      final file = File(xFile.path);

      // Check if file exists and is readable
      if (!await file.exists()) {
        if (mounted) {
          setState(() {
            _isLoading = false;
            _errorMessage = "فشل حفظ الصورة. يرجى المحاولة مرة أخرى";
          });
        }
        return;
      }

      // Call the onCapture callback which may throw exceptions
      await widget.onCapture(file);

      if (mounted) {
        setState(() {
          _isSuccess = true;
          _isLoading = false;
        });

        // Auto-close after 2 seconds
        Future.delayed(const Duration(seconds: 2), () {
          if (mounted) {
            Navigator.of(context).pop(true);
          }
        });
      }
    } on ServerException catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _errorMessage = e.message;
        });
      }
    } on NetworkException catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _errorMessage = e.message;
        });
      }
    } on CameraException catch (e) {
      if (mounted) {
        String errorMessage;
        switch (e.code) {
          case 'captureAlreadyActive':
            errorMessage = "جاري التقاط صورة بالفعل. يرجى الانتظار";
            break;
          case 'pictureTakingInProgress':
            errorMessage = "جاري التقاط صورة. يرجى الانتظار";
            break;
          default:
            errorMessage = "فشل التقاط الصورة: ${e.description ?? 'خطأ غير معروف'}";
        }
        setState(() {
          _isLoading = false;
          _errorMessage = errorMessage;
        });
      }
    } on FileSystemException catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _errorMessage = "فشل حفظ الصورة. يرجى التحقق من مساحة التخزين";
        });
      }
      print("File system error: $e");
    } catch (e) {
      if (mounted) {
        setState(() {
          _isLoading = false;
          _errorMessage = "حدث خطأ غير متوقع. يرجى المحاولة مرة أخرى";
        });
      }
      print("Unexpected error in _startScan: $e");
    }
  }

  @override
  void dispose() {
    _cameraController?.dispose();
    _timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color(0xff000000),

      body:
          // Show error screen only if camera failed to initialize
          _errorMessage != null && !_isCameraInitialized
              ? Center(
                child: Padding(
                  padding: const EdgeInsets.all(20.0),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Icon(
                        Icons.camera_alt_outlined,
                        size: 64,
                        color: Colors.white70,
                      ),
                      SizedBox(height: 16),
                      Text(
                        _errorMessage!,
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 18,
                          fontWeight: FontWeight.bold,
                        ),
                        textAlign: TextAlign.center,
                      ),
                      SizedBox(height: 24),
                      Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          ElevatedButton(
                            onPressed: _initializeCamera,
                            style: ElevatedButton.styleFrom(
                              backgroundColor: Color(0xffE8001A),
                              foregroundColor: Colors.white,
                              padding: EdgeInsets.symmetric(
                                horizontal: 32,
                                vertical: 12,
                              ),
                            ),
                            child: Text("إعادة المحاولة"),
                          ),
                          SizedBox(width: 16),
                          OutlinedButton(
                            onPressed: () {
                              if (mounted) {
                                Navigator.of(context).pop(false);
                              }
                            },
                            style: OutlinedButton.styleFrom(
                              foregroundColor: Colors.white,
                              side: BorderSide(color: Colors.white70),
                              padding: EdgeInsets.symmetric(
                                horizontal: 32,
                                vertical: 12,
                              ),
                            ),
                            child: Text("إلغاء"),
                          ),
                        ],
                      ),
                    ],
                  ),
                ),
              )
              : _isCameraInitialized && _cameraController != null
              ? Stack(
                children: [
                  SizedBox(height: MediaQuery.of(context).size.height),

                  // Camera Preview
                  Positioned(
                    child: Center(child: CameraPreview(_cameraController!)),
                  ),
                  // Oval overlay with dimmed background
                  Positioned.fill(
                    child: CustomPaint(painter: _OvalOverlayPainter()),
                  ),

                  // Top Text
                  Positioned(
                    top: 100,
                    left: 0,
                    right: 0,
                    child: Center(
                      child: Text(
                        widget.isLogin ? "تسجيل الدخول" : "تسجيل خروج",
                        style: TextStyle(
                          color: Colors.white,
                          fontSize: 24,
                          fontWeight: FontWeight.bold,
                          fontFamily:
                              'Cairo', // Assuming Cairo font based on Arabic text
                        ),
                      ),
                    ),
                  ),

                  // Bottom Text and Logo
                  Positioned(
                    bottom: 80,
                    left: 0,
                    right: 0,
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        Text(
                          _isSuccess
                              ? (widget.isLogin
                                  ? "تم تسجيل دخولك بنجاح"
                                  : "تم تسجيل خروجك بنجاح")
                              : _isLoading
                                  ? (widget.isLogin
                                      ? "يتم تسجيل الدخول ..."
                                      : "يتم تسجيل الخروج ...")
                                  : (widget.isLogin
                                      ? "جاهز للتقاط الصورة"
                                      : "جاهز للتقاط الصورة"),
                          style: const TextStyle(
                            color: Colors.white,
                            fontSize: 18,
                            fontWeight: FontWeight.bold,
                          ),
                        ),
                        const SizedBox(height: 20),
                        // Logo
                        SizedBox(
                          height: _isSuccess ? 80 : 60,
                          width: _isSuccess ? 80 : 60,
                          child: SvgPicture.asset(
                            _isSuccess
                                ? 'assets/images/logSuccess.svg'
                                : 'assets/images/logLoading.svg',
                            // ignore: deprecated_member_use
                            color: Colors.white,
                            fit: BoxFit.contain,
                          ),
                        ),
                      ],
                    ),
                  ),

                  // Error overlay (shown when error occurs during scanning)
                  if (_errorMessage != null && _isCameraInitialized)
                    Positioned.fill(
                      child: Container(
                        color: Colors.black.withOpacity(0.7),
                        child: Center(
                          child: Padding(
                            padding: const EdgeInsets.all(20.0),
                            child: Column(
                              mainAxisAlignment: MainAxisAlignment.center,
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                Icon(
                                  Icons.error_outline,
                                  size: 64,
                                  color: Colors.red,
                                ),
                                SizedBox(height: 16),
                                Text(
                                  _errorMessage!,
                                  style: TextStyle(
                                    color: Colors.white,
                                    fontSize: 18,
                                    fontWeight: FontWeight.bold,
                                  ),
                                  textAlign: TextAlign.center,
                                ),
                                SizedBox(height: 24),
                                Row(
                                  mainAxisAlignment: MainAxisAlignment.center,
                                  children: [
                                    ElevatedButton(
                                      onPressed: () {
                                        setState(() {
                                          _errorMessage = null;
                                          _isLoading = false;
                                        });
                                        _startScan();
                                      },
                                      style: ElevatedButton.styleFrom(
                                        backgroundColor: Color(0xffE8001A),
                                        foregroundColor: Colors.white,
                                        padding: EdgeInsets.symmetric(
                                          horizontal: 32,
                                          vertical: 12,
                                        ),
                                      ),
                                      child: Text("إعادة المحاولة"),
                                    ),
                                    SizedBox(width: 16),
                                    OutlinedButton(
                                      onPressed: () {
                                        if (mounted) {
                                          Navigator.of(context).pop(false);
                                        }
                                      },
                                      style: OutlinedButton.styleFrom(
                                        foregroundColor: Colors.white,
                                        side: BorderSide(color: Colors.white70),
                                        padding: EdgeInsets.symmetric(
                                          horizontal: 32,
                                          vertical: 12,
                                        ),
                                      ),
                                      child: Text("إلغاء"),
                                    ),
                                  ],
                                ),
                              ],
                            ),
                          ),
                        ),
                      ),
                    ),

                  // // Capture button
                  // Positioned(
                  //   bottom: 60,
                  //   left: 0,
                  //   right: 0,
                  //   child: Center(
                  //     child: GestureDetector(
                  //       onTap: (){},
                  //       child: Container(
                  //         width: 72,
                  //         height: 72,
                  //         decoration: BoxDecoration(
                  //           shape: BoxShape.circle,
                  //           color: Colors.white,
                  //           boxShadow: [
                  //             BoxShadow(
                  //               color: Colors.black26,
                  //               blurRadius: 8,
                  //               offset: Offset(0, 4),
                  //             ),
                  //           ],
                  //         ),
                  //         child: Icon(Icons.camera_alt, color: Color(0xffE8001A), size: 36),
                  //       ),
                  //     ),
                  //   ),
                  // ),
                ],
              )
              : Center(
                child: CircularProgressIndicator(color: Color(0xffE8001A)),
              ),
    );
  }
}

class _OvalOverlayPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final width = size.width * 0.75;
    final height = size.height * 0.4;
    final center = Offset(size.width / 2, size.height / 2);
    final ovalRect = Rect.fromCenter(
      center: center,
      width: width,
      height: height,
    );

    // Create a path for the whole screen
    final screenPath =
        Path()..addRect(Rect.fromLTWH(0, 0, size.width, size.height));
    // Create a path for the oval
    final ovalPath = Path()..addOval(ovalRect);
    // Subtract the oval from the screen path
    final overlayPath = Path.combine(
      PathOperation.difference,
      screenPath,
      ovalPath,
    );

    // Draw the dimmed area outside the oval with gradient
    final gradient = LinearGradient(
      begin: Alignment.topCenter,
      end: Alignment.bottomCenter,
      colors: [
        Color.fromARGB(255, 41, 41, 41), // top dark gray
        Color.fromARGB(255, 0, 20, 15), // bottom deep green
      ],
    );
    final paint =
        Paint()
          ..shader = gradient.createShader(
            Rect.fromLTWH(0, 0, size.width, size.height),
          )
          ..style = PaintingStyle.fill;
    canvas.drawPath(overlayPath, paint);

    // Draw glowing circles effect (like AppBackground) - drawn after overlay
    // Top circle - positioned similar to AppBackground (top: -250, left: 100, right: -200)
    final topCircleCenter = Offset(size.width * 0.3, -250);
    final topCircleRadius = 150.0;
    // Draw multiple circles with different opacities for spread effect (spreadRadius: 160)
    for (int i = 0; i < 5; i++) {
      final spreadPaint =
          Paint()
            ..color = Color.fromARGB(69 ~/ (i + 1), 62, 254, 190)
            ..maskFilter = MaskFilter.blur(BlurStyle.normal, 140 - (i * 20));
      canvas.drawCircle(
        topCircleCenter,
        topCircleRadius + (i * 30),
        spreadPaint,
      );
    }

    // Bottom circle - positioned similar to AppBackground (bottom: 100, left: -140, right: -120)
    final bottomCircleCenter = Offset(size.width * 0.2, size.height + 100);
    final bottomCircleRadius = 160.0;
    // Draw multiple circles with different opacities for spread effect (spreadRadius: 60)
    for (int i = 0; i < 5; i++) {
      final spreadPaint =
          Paint()
            ..color = Color.fromARGB(83 ~/ (i + 1), 62, 254, 190)
            ..maskFilter = MaskFilter.blur(BlurStyle.normal, 180 - (i * 25));
      canvas.drawCircle(
        bottomCircleCenter,
        bottomCircleRadius + (i * 40),
        spreadPaint,
      );
    }

    // Draw oval border
    final borderPaint =
        Paint()
          ..color = Colors.greenAccent
          ..style = PaintingStyle.stroke
          ..strokeWidth = 4;
    canvas.drawOval(ovalRect, borderPaint);
  }

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