rasadyar_application/packages/auth/lib/presentation/widget/captcha/view.dart

import 'dart:math';

import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:rasadyar_auth/presentation/pages/auth/logic.dart';
import 'package:rasadyar_auth/presentation/widget/clear_button.dart';
import 'package:rasadyar_core/core.dart';

import 'logic.dart';

class CaptchaWidget extends GetView<CaptchaWidgetLogic> {
  const CaptchaWidget({super.key});

  @override
  Widget build(BuildContext context) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        GestureDetector(
          onTap: controller.getCaptcha,
          child: Container(
            width: 135,
            height: 50,
            clipBehavior: Clip.antiAliasWithSaveLayer,
            decoration: BoxDecoration(
              color: AppColor.whiteNormalHover,
              border: Border.all(color: Colors.grey.shade300),
              borderRadius: BorderRadius.circular(8),
            ),
            child: controller.obx(
              (state) => Center(
                child: Stack(
                  alignment: Alignment.center,
                  children: [
                    CustomPaint(size: const Size(135, 50), painter: _CaptchaLinePainter()),
                    Text(controller.captchaKey.value ?? 'دوباره سعی کنید', style: AppFonts.yekan24Bold),
                  ],
                ),
              ),
              onLoading: const Center(child: CupertinoActivityIndicator(color: AppColor.blueNormal)),
              onError: (error) {
                return const Center(child: Text('خطا در بارگذاری کد امنیتی', style: AppFonts.yekan13));
              },
            ),
          ),
        ),

        const SizedBox(width: 8),
        Expanded(
          child: Form(
            key: controller.formKey,
            autovalidateMode: AutovalidateMode.disabled,
            child: ObxValue((data) {
              return RTextField(
                label: 'کد امنیتی',
                controller: data.value,
                keyboardType: TextInputType.numberWithOptions(decimal: false, signed: false),
                maxLines: 1,
                maxLength: 6,
                suffixIcon: (data.value.text.trim().isNotEmpty ?? false)
                    ? clearButton(() => controller.textController.value.clear())
                    : null,

                onSubmitted: (data) {},
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return 'کد امنیتی را وارد کنید';
                  } else if (controller.captchaKey.value != null && controller.captchaKey.value != value) {
                    return 'کد امنیتی اشتباه است';
                  }
                  return null;
                },
                onChanged: (pass) {
                  if(pass.length== 6) {
                    if(controller.formKey.currentState?.validate()??false) {
                      Get.find<AuthLogic>().isDisabled.value = false;

                    }
                  }
                },
                style: AppFonts.yekan13,
              );
            }, controller.textController),
          ),
        ),
      ],
    );
  }
}

class _CaptchaLinePainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final random = Random();
    final paint1 = Paint()
      ..color = Colors.deepOrange
      ..strokeWidth = 2;
    final paint2 = Paint()
      ..color =Colors.blue
      ..strokeWidth = 2;

// First line: top-left to bottom-right
    canvas.drawLine(
      Offset(0, 0),
      Offset(size.width, size.height),
      paint1,
    );

// Second line: bottom-left to top-right
    canvas.drawLine(
      Offset(0, size.height),
      Offset(size.width, 0),
      paint2,
    );
  }

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