import 'dart:async';

import 'package:accurate_lite/core/components/page/scan/scanner_error_view.dart';
import 'package:flutter/material.dart';
import 'package:flutter_hooks/flutter_hooks.dart';
import 'package:mobile_scanner/mobile_scanner.dart';

class FlexibleScanBarcode extends StatefulHookWidget {
  const FlexibleScanBarcode({
    super.key,
    this.descScannerText = '',
    this.isUseExternalScanner = true,
    required this.doOnDetect,
    required this.controller,
  });

  final String? descScannerText;
  final bool isUseExternalScanner;
  final Future Function(String _barcodeFound) doOnDetect;
  final MobileScannerController controller;

  @override
  State<FlexibleScanBarcode> createState() => _FlexibleScanBarcodeState();
}

class _FlexibleScanBarcodeState extends State<FlexibleScanBarcode>
    with SingleTickerProviderStateMixin {
  late AnimationController _animationController;
  String _barcodeFound = '';
  bool _isDetected = false;
  Barcode? barcode;
  BarcodeCapture? capture;
  Timer? _debounceTimer;

  @override
  void initState() {
    super.initState();
    _animationController = AnimationController(
      duration: const Duration(seconds: 1),
      reverseDuration: const Duration(seconds: 1),
      vsync: this,
    );

    widget.controller.start();
    _animationController.repeat(reverse: true);
  }

  @override
  void dispose() {
    widget.controller.dispose();
    _animationController.stop();
    _animationController.dispose();
    super.dispose();
  }

  void onDetect(BarcodeCapture barcode) async {
    if (_debounceTimer?.isActive ?? false) return;

    _debounceTimer = Timer(const Duration(milliseconds: 500), () async {
      capture = barcode;
      this.barcode = barcode.barcodes.first;

      for (final barcodes in capture!.barcodes) {
        _barcodeFound = barcodes.rawValue!;

        if (!_isDetected) {
          _isDetected = true;
          await widget.doOnDetect(_barcodeFound).then((value) {
            _isDetected = false;
          });
          _debounceTimer?.cancel();
        }
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    const scanWindowWidthFactor = 0.9;
    double scanWindowHeightFactor = 0.8;
    double scanWindowTopFactor = 0.1;

    return LayoutBuilder(
      builder: (context, constraints) {
        if (constraints.maxHeight > 550) {
          scanWindowHeightFactor = 0.4;
          scanWindowTopFactor = 0.3;
        }

        final scanWindow = Rect.fromLTWH(
          constraints.maxWidth * (1 - scanWindowWidthFactor) / 2,
          constraints.maxHeight *
              scanWindowTopFactor, // Adjusted for half screen
          constraints.maxWidth * scanWindowWidthFactor,
          constraints.maxHeight * scanWindowHeightFactor,
        );

        return SizedBox(
          width: constraints.maxWidth,
          height: constraints.maxHeight,
          child: Stack(
            children: [
              MobileScanner(
                scanWindow: scanWindow,
                controller: widget.controller,
                errorBuilder: (context, error, child) {
                  return ScannerErrorView(
                    error: error,
                    controller: widget.controller,
                  );
                },
                onDetect: onDetect,
              ),
              // Overlay for scanner
              CustomPaint(
                size: Size(constraints.maxWidth, constraints.maxHeight),
                painter: ScannerOverlay(scanWindow),
              ),
              // Red line
              CustomPaint(
                size: Size(constraints.maxWidth, constraints.maxHeight),
                painter: RedLinePainter(
                  animationController: _animationController,
                  scanWindow: scanWindow,
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}

class RedLinePainter extends CustomPainter {
  RedLinePainter({
    required this.animationController,
    required this.scanWindow,
  });

  final AnimationController animationController;
  final Rect scanWindow;

  late final Animation<double> _animation =
      Tween<double>(begin: 0, end: 1).animate(animationController);

  @override
  void paint(Canvas canvas, Size size) {
    final paint = Paint()
      ..color = Colors.red.withOpacity(_animation.value)
      ..strokeWidth = 2
      ..style = PaintingStyle.stroke
      ..strokeCap = StrokeCap.round;

    // Calculate line position based on scan window
    final centerY = scanWindow.top + (scanWindow.height * 0.5);

    canvas.drawLine(
      Offset(scanWindow.left + 20, centerY),
      Offset(scanWindow.right - 20, centerY),
      paint,
    );
  }

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

class ScannerOverlay extends CustomPainter {
  ScannerOverlay(this.scanWindow);

  final Rect scanWindow;

  @override
  void paint(Canvas canvas, Size size) {
    final backgroundPath = Path()..addRect(Rect.largest);
    final cutoutPath = Path()..addRect(scanWindow);

    // Menggambar overlay hitam transparan
    canvas.drawPath(
      Path.combine(
        PathOperation.difference,
        backgroundPath,
        cutoutPath,
      ),
      Paint()..color = Colors.black.withOpacity(0.5),
    );

    // Menggambar border putih di sekitar area scanning
    final borderPaint = Paint()
      ..color = Colors.transparent
      ..style = PaintingStyle.stroke
      ..strokeWidth = 2.0;

    canvas.drawRect(scanWindow, borderPaint);
  }

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