rasadyar_application/lib/presentation/widget/captcha/captcha_widget.dart

import 'dart:math';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:rasadyar_app/presentation/common/app_color.dart';
import 'package:rasadyar_app/presentation/common/app_fonts.dart';

class CaptchaController {
  int? captchaCode;
  TextEditingController textController = TextEditingController();
  GlobalKey<FormState> formKey = GlobalKey<FormState>();

  late Function() refreshCaptcha;

  bool validate() {
    if (formKey.currentState?.validate() == true) {
      return true;
    }
    return false;
  }

  String get enteredText => textController.text;

  bool isCorrect() {
    return textController.text == captchaCode.toString();
  }

  void clear() {
    textController.clear();
  }
}

class RandomLinePainter extends CustomPainter {
  final Random random = Random();
  final Paint linePaint;
  final List<Offset> points;

  RandomLinePainter({
    required this.points,
    required Color lineColor,
    double strokeWidth = 2.0,
  }) : linePaint =
           Paint()
             ..color = lineColor
             ..strokeWidth = strokeWidth
             ..strokeCap = StrokeCap.round
             ..style = PaintingStyle.stroke;

  @override
  void paint(Canvas canvas, Size size) {
    final path = Path();

    if (points.isNotEmpty) {
      path.moveTo(points[0].dx, points[0].dy);

      for (int i = 1; i < points.length; i++) {
        path.lineTo(points[i].dx, points[i].dy);
      }

      canvas.drawPath(path, linePaint);
    }
  }

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

class CaptchaWidget extends StatefulWidget {
  final CaptchaController controller;
  final bool autoValidateMode;

  const CaptchaWidget({
    required this.controller,
    this.autoValidateMode = false,
    super.key,
  });

  @override
  _CaptchaWidgetState createState() => _CaptchaWidgetState();
}

class _CaptchaWidgetState extends State<CaptchaWidget> {
  late List<Offset> points;
  late List<Offset> points1;
  late List<Offset> points2;
  bool isOnError = false;

  @override
  void initState() {
    super.initState();
    generateLines();
    getRandomSixDigitNumber();

    // Set the refresh function in the controller
    widget.controller.refreshCaptcha = () {
      getRandomSixDigitNumber();
      generateLines();
      setState(() {});
    };
  }

  void generateLines() {
    points = generateRandomLine();
    points1 = generateRandomLine();
    points2 = generateRandomLine();
    setState(() {});
  }

  List<Offset> generateRandomLine() {
    final random = Random();
    int pointCount = random.nextInt(10) + 5;
    List<Offset> points = [];

    double previousY = 0;

    for (int i = 0; i < pointCount; i++) {
      double x = (i / (pointCount - 1)) * 135;

      if (i == 0) {
        previousY = 24;
      } else {
        double change = (random.nextDouble() * 20) - 10;
        previousY = max(5, min(43, previousY + change));
      }

      points.add(Offset(x, previousY));
    }

    return points;
  }

  void getRandomSixDigitNumber() {
    final random = Random();
    widget.controller.captchaCode = random.nextInt(900000) + 100000;
    setState(() {});
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Container(
          width: 135,
          height: 48,
          decoration: BoxDecoration(
            color: AppColor.whiteNormalHover,
            border: Border.all(color: Colors.grey.shade300),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Stack(
            alignment: AlignmentDirectional.center,
            children: [
              CustomPaint(
                painter: RandomLinePainter(
                  points: points,
                  lineColor: Colors.blue,
                  strokeWidth: 1.0,
                ),
                size: const Size(double.infinity, double.infinity),
              ),
              CustomPaint(
                painter: RandomLinePainter(
                  points: points1,
                  lineColor: Colors.green,
                  strokeWidth: 1.0,
                ),
                size: const Size(double.infinity, double.infinity),
              ),
              CustomPaint(
                painter: RandomLinePainter(
                  points: points2,
                  lineColor: Colors.red,
                  strokeWidth: 1.0,
                ),
                size: const Size(double.infinity, double.infinity),
              ),
              Text(
                widget.controller.captchaCode.toString(),
                style: AppFonts.yekan24,
              ),
            ],
          ),
        ),
        const SizedBox(height: 20),
        IconButton(
          padding: EdgeInsets.zero,
          onPressed: widget.controller.refreshCaptcha,
          icon: Icon(CupertinoIcons.refresh, size: 16),
        ),
        Expanded(
          child: Form(
            key: widget.controller.formKey,
            autovalidateMode:
                widget.autoValidateMode
                    ? AutovalidateMode.onUserInteraction
                    : AutovalidateMode.disabled,
            child: TextFormField(
              controller: widget.controller.textController,
              decoration: InputDecoration(
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(8),
                  gapPadding: 11,
                ),
                labelText: 'کد امنیتی',
                labelStyle: AppFonts.yekan13,
                errorStyle: AppFonts.yekan10.copyWith(
                  color: AppColor.redNormal,
                  fontSize: 8,
                ),
                suffixIconConstraints: BoxConstraints(
                  maxHeight: 24,
                  minHeight: 24,
                  maxWidth: 24,
                  minWidth: 24,
                ),

                suffix:
                    widget.controller.textController.text.trim().isNotEmpty
                        ? clearButton(() {
                          widget.controller.textController.clear();
                          setState(() {});
                        })
                        : null,
                counterText: '',
              ),
              keyboardType: TextInputType.numberWithOptions(
                decimal: false,
                signed: false,
              ),
              maxLines: 1,
              maxLength: 6,
              onChanged: (value) {
                if (isOnError) {
                  isOnError = !isOnError;
                  widget.controller.formKey.currentState?.reset();
                  widget.controller.textController.text = value;
                }
                setState(() {});
              },
              validator: (value) {
                if (value == null || value.isEmpty) {
                  isOnError = true;
                  return 'کد امنیتی را وارد کنید';
                }
                if (value != widget.controller.captchaCode.toString()) {
                  isOnError = true;
                  return '⚠️کد امنیتی وارد شده اشتباه است';
                }
                return null;
              },
              style: AppFonts.yekan13,
            ),
          ),
        ),
      ],
    );
  }

  Widget clearButton(VoidCallback onTap) {
    return GestureDetector(
      onTap: onTap,
      child: Icon(CupertinoIcons.multiply_circle, size: 18),
    );
  }
}