import 'dart:io';
import 'dart:ui';
import 'package:camera/camera.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../../core/theme.dart';
import '../../widgets/atoms/custom_button.dart';
import '../../widgets/atoms/scanner_overlay.dart';

class CameraCaptureScreen extends StatefulWidget {
  const CameraCaptureScreen({Key? key}) : super(key: key);

  @override
  State<CameraCaptureScreen> createState() => _CameraCaptureScreenState();
}

class _CameraCaptureScreenState extends State<CameraCaptureScreen> {
  CameraController? _controller;
  Future<void>? _initializeControllerFuture;
  XFile? _capturedImage;
  bool _isCameraInitialized = false;

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

  Future<void> _initializeCamera() async {
    final cameras = await availableCameras();
    final firstCamera = cameras.firstWhere(
      (camera) => camera.lensDirection == CameraLensDirection.front,
      orElse: () => cameras.first,
    );

    _controller = CameraController(
      firstCamera,
      ResolutionPreset.medium,
      enableAudio: false,
    );

    _initializeControllerFuture = _controller!.initialize();
    await _initializeControllerFuture;

    if (mounted) {
      setState(() {
        _isCameraInitialized = true;
      });
    }
  }

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

  Future<void> _takePicture() async {
    try {
      await _initializeControllerFuture;
      final image = await _controller!.takePicture();
      HapticFeedback.lightImpact();
      if (!mounted) return;

      setState(() {
        _capturedImage = image;
      });
    } catch (e) {
      print(e);
    }
  }

  void _retakePicture() {
    setState(() {
      _capturedImage = null;
    });
  }

  void _usePicture() {
    if (_capturedImage != null) {
      Navigator.pop(context, File(_capturedImage!.path));
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      extendBodyBehindAppBar: true,
      appBar: AppBar(
        backgroundColor: Colors.transparent,
        elevation: 0,
        leading: IconButton(
          icon: Container(
            padding: const EdgeInsets.all(8),
            decoration: BoxDecoration(
              color: Colors.black.withOpacity(0.5),
              shape: BoxShape.circle,
            ),
            child: const Icon(Icons.close, color: Colors.white, size: 16),
          ),
          onPressed: () => Navigator.pop(context),
        ),
      ),
      body: Stack(
        children: [
          if (_isCameraInitialized)
            SizedBox.expand(
              child: FittedBox(
                fit: BoxFit.cover,
                child: SizedBox(
                  width: _controller!.value.previewSize?.height ?? MediaQuery.of(context).size.width,
                  height: _controller!.value.previewSize?.width ?? MediaQuery.of(context).size.height,
                  child: CameraPreview(_controller!),
                ),
              ),
            )
          else
            const Center(child: CircularProgressIndicator(color: Colors.white)),
            
          if (_capturedImage != null)
             SizedBox.expand(
              child: Image.file(
                File(_capturedImage!.path),
                fit: BoxFit.cover,
              ),
            ),

          ScannerOverlay(
            borderColor: _capturedImage != null ? AppTheme.statusGreen : AppTheme.primaryBlue,
            isScanning: _capturedImage == null, 
          ),

          Positioned(
            top: MediaQuery.of(context).padding.top + kToolbarHeight + 20,
            left: 20,
            right: 20,
            child: Column(
              children: [
                Text(
                  "Ambil Foto Selfie",
                  style: AppTheme.heading3.copyWith(color: Colors.white),
                ),
                const SizedBox(height: 10),
                ClipRRect(
                  borderRadius: BorderRadius.circular(20),
                  child: BackdropFilter(
                    filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
                    child: Container(
                      padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 10),
                      decoration: BoxDecoration(
                        color: Colors.white.withOpacity(0.15),
                        borderRadius: BorderRadius.circular(20),
                        border: Border.all(color: Colors.white.withOpacity(0.3)),
                      ),
                      child: Text(
                        _capturedImage != null
                            ? "Foto berhasil diambil ✓"
                            : "Posisikan wajah di dalam bingkai",
                        textAlign: TextAlign.center,
                        style: AppTheme.bodyLarge.copyWith(
                          color: _capturedImage != null ? AppTheme.statusGreen : Colors.white,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),

          Positioned(
            bottom: 40,
            left: 20,
            right: 20,
            child: _capturedImage != null
                ? Row(
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                    children: [
                      Expanded(
                        child: CustomButton(
                          text: "Foto Ulang",
                          type: ButtonType.secondary,
                          onPressed: _retakePicture,
                          icon: Icons.refresh,
                        ),
                      ),
                      const SizedBox(width: 16),
                      Expanded(
                        child: CustomButton(
                          text: "Gunakan",
                          type: ButtonType.primary,
                          onPressed: _usePicture,
                          icon: Icons.check,
                          backgroundColor: AppTheme.statusGreen,
                        ),
                      ),
                    ],
                  )
                : Center(
                    child: GestureDetector(
                      onTap: _takePicture,
                      child: Container(
                        width: 76,
                        height: 76,
                        decoration: BoxDecoration(
                          shape: BoxShape.circle,
                          border: Border.all(color: Colors.white.withOpacity(0.8), width: 6),
                          color: Colors.white.withOpacity(0.2),
                          boxShadow: [
                            BoxShadow(
                              color: Colors.black.withOpacity(0.2),
                              blurRadius: 10,
                            )
                          ]
                        ),
                        child: Container(
                          margin: const EdgeInsets.all(6),
                          decoration: const BoxDecoration(
                            shape: BoxShape.circle,
                            color: Colors.white,
                          ),
                        ),
                      ),
                    ),
                  ),
          ),
        ],
      ),
    );
  }
}