HMG_Patient_App/lib/widgets/otp_widget.dart

import 'dart:async';

import 'package:flutter/animation.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter/services.dart';
import 'package:hmg_patient_app/uitl/utils.dart';

typedef OnDone = void Function(String text);

class ProvidedPinBoxTextAnimation {
  static AnimatedSwitcherTransitionBuilder scalingTransition = (child, animation) {
    return ScaleTransition(
      child: child,
      scale: animation,
    );
  };

  static AnimatedSwitcherTransitionBuilder defaultNoTransition = (Widget child, Animation<double> animation) {
    return child;
  };
}

class OTPWidget extends StatefulWidget {
  final int maxLength;
  late TextEditingController? controller;

  final Color defaultBorderColor;
  final Color pinBoxColor;
  final double pinBoxBorderWidth;
  final double pinBoxRadius;
  final bool hideDefaultKeyboard;

  final TextStyle? pinTextStyle;
  final double pinBoxHeight;
  final double pinBoxWidth;
  final OnDone? onDone;
  final bool hasError;
  final Color errorBorderColor;
  final Color textBorderColor;
  final Function(String)? onTextChanged;
  final bool autoFocus;
  final FocusNode? focusNode;
  final AnimatedSwitcherTransitionBuilder? pinTextAnimatedSwitcherTransition;
  final Duration pinTextAnimatedSwitcherDuration;
  final TextDirection textDirection;
  final TextInputType keyboardType;
  final EdgeInsets pinBoxOuterPadding;

  OTPWidget({
    Key? key,
    this.maxLength = 4,
    this.controller,
    this.pinBoxWidth = 70.0,
    this.pinBoxHeight = 70.0,
    this.pinTextStyle,
    this.onDone,
    this.defaultBorderColor = Colors.black,
    this.textBorderColor = Colors.black,
    this.pinTextAnimatedSwitcherTransition,
    this.pinTextAnimatedSwitcherDuration = const Duration(),
    this.hasError = false,
    this.errorBorderColor = Colors.red,
    this.onTextChanged,
    this.autoFocus = false,
    this.focusNode,
    this.textDirection = TextDirection.ltr,
    this.keyboardType = TextInputType.number,
    this.pinBoxOuterPadding = const EdgeInsets.symmetric(horizontal: 4.0),
    this.pinBoxColor = Colors.white,
    this.pinBoxBorderWidth = 2.0,
    this.pinBoxRadius = 0,
    this.hideDefaultKeyboard = false,
  }) : super(key: key);

  @override
  State<StatefulWidget> createState() {
    return OTPWidgetState();
  }
}

class OTPWidgetState extends State<OTPWidget> with SingleTickerProviderStateMixin {
  late AnimationController _highlightAnimationController;
  late FocusNode focusNode;
  String text = "";
  int currentIndex = 0;
  List<String> strList = [];
  bool hasFocus = false;

  @override
  void didUpdateWidget(OTPWidget oldWidget) {
    super.didUpdateWidget(oldWidget);
    focusNode = widget.focusNode ?? focusNode;

    if (oldWidget.maxLength < widget.maxLength) {
      setState(() {
        currentIndex = text.length;
      });
      widget.controller?.text = text;
      widget.controller?.selection = TextSelection.collapsed(offset: text.length);
    } else if (oldWidget.maxLength > widget.maxLength && widget.maxLength > 0 && text.length > 0 && text.length > widget.maxLength) {
      setState(() {
        text = text.substring(0, widget.maxLength);
        currentIndex = text.length;
      });
      widget.controller?.text = text;
      widget.controller?.selection = TextSelection.collapsed(offset: text.length);
    }
  }

  _calculateStrList() {
    if (strList.length > widget.maxLength) {
      strList.length = widget.maxLength;
    }
    while (strList.length < widget.maxLength) {
      strList.add("");
    }
  }

  @override
  void initState() {
    super.initState();
    focusNode = widget.focusNode ?? FocusNode();
    _highlightAnimationController = AnimationController(vsync: this);
    _initTextController();
    _calculateStrList();
    widget.controller!.addListener(_controllerListener);
    focusNode.addListener(_focusListener);
  }

  void _controllerListener() {
    if (mounted == true) {
      setState(() {
        _initTextController();
      });
      var onTextChanged = widget.onTextChanged;
      if (onTextChanged != null) {
        onTextChanged(widget.controller?.text ?? "");
      }
    }
  }

  void _focusListener() {
    if (mounted == true) {
      setState(() {
        hasFocus = focusNode?.hasFocus ?? false;
      });
    }
  }

  void _initTextController() {
    if (widget.controller == null) {
      return;
    }
    strList.clear();
    var text = widget.controller?.text ?? "";
    if (text.isNotEmpty) {
      if (text.length > widget.maxLength) {
        throw Exception("TextEditingController length exceeded maxLength!");
      }
    }
    for (var i = 0; i < text.length; i++) {
      strList.add(text[i]);
    }
  }

  // Updated: Always use full screen width for responsive design
  double _width(BuildContext context) {
    return MediaQuery.of(context).size.width;
  }

  @override
  void dispose() {
    if (widget.focusNode == null) {
      focusNode.dispose();
    } else {
      focusNode.removeListener(_focusListener);
    }
    _highlightAnimationController.dispose();
    widget.controller?.removeListener(_controllerListener);

    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Stack(
      fit: StackFit.loose,
      children: <Widget>[
        _otpTextInput(context),
        _touchPinBoxRow(),
      ],
    );
  }

  Widget _touchPinBoxRow() {
    return widget.hideDefaultKeyboard
        ? _pinBoxRow(context)
        : GestureDetector(
      behavior: HitTestBehavior.opaque,
      onTap: () {
        if (hasFocus) {
          FocusScope.of(context).requestFocus(FocusNode());
          Future.delayed(Duration(milliseconds: 100), () {
            FocusScope.of(context).requestFocus(focusNode);
          });
        } else {
          FocusScope.of(context).requestFocus(focusNode);
        }
      },
      child: _pinBoxRow(context),
    );
  }

  // Updated: Accept context for width calculation
  Widget _otpTextInput(BuildContext context) {
    var transparentBorder = OutlineInputBorder(
      borderSide: BorderSide(color: Colors.transparent, width: 0),
    );
    return Container(
      width: _width(context), // Use dynamic width
      height: widget.pinBoxHeight,
      child: TextField(
        autofocus: !kIsWeb ? widget.autoFocus : false,
        enableInteractiveSelection: false,
        focusNode: focusNode,
        controller: widget.controller,
        textAlign: TextAlign.center,
        keyboardType: widget.keyboardType,
        inputFormatters: widget.keyboardType == TextInputType.number ? <TextInputFormatter>[FilteringTextInputFormatter.digitsOnly] : null,
        style: TextStyle(
          height: 0.5,
          color: Colors.transparent,
        ),
        decoration: InputDecoration(
            contentPadding: EdgeInsets.all(0),
            focusedErrorBorder: transparentBorder,
            errorBorder: transparentBorder,
            disabledBorder: transparentBorder,
            enabledBorder: transparentBorder,
            focusedBorder: transparentBorder,
            counterText: null,
            counterStyle: null,
            helperStyle: TextStyle(height: 0.0, color: Colors.transparent),
            labelStyle: TextStyle(height: 0.1),
            fillColor: Colors.transparent,
            border: InputBorder.none,
            isDense: true),
        cursorColor: Colors.transparent,
        showCursor: false,
        maxLength: widget.maxLength,
        onChanged: _onTextChanged,
      ),
    );
  }

  void _onTextChanged(text) {
    var onTextChanged = widget.onTextChanged;
    if (onTextChanged != null) {
      onTextChanged(text);
    }
    setState(() {
      this.text = text;
      if (text.length >= currentIndex) {
        for (int i = currentIndex; i < text.length; i++) {
          strList[i] = text[i];
        }
      }
      currentIndex = text.length;
    });
    if (text.length == widget.maxLength) {
      FocusScope.of(context).requestFocus(FocusNode());
      var onDone = widget.onDone;
      if (onDone != null) {
        onDone(text);
      }
    }
  }

  Widget _pinBoxRow(BuildContext context) {
    _calculateStrList();

    // Calculate dynamic width for all screen sizes to prevent scrolling
    double screenWidth = MediaQuery.of(context).size.width;
    double totalHorizontalPadding = widget.pinBoxOuterPadding.left + widget.pinBoxOuterPadding.right;
    double totalMargin = widget.maxLength * totalHorizontalPadding;
    double availableWidth = screenWidth - totalMargin - 32; // 32 for additional safe padding
    double boxWidth = (availableWidth / widget.maxLength).clamp(60.0, 200.0); // Reasonable limits

    List<Widget> pinCodes = List.generate(widget.maxLength, (int i) {
      return Expanded(
        child: Container(
          margin: widget.pinBoxOuterPadding,
          child: _buildPinCode(i, context, boxWidth),
        ),
      );
    });

    return Row(
      children: pinCodes,
      mainAxisSize: MainAxisSize.max,
      mainAxisAlignment: MainAxisAlignment.spaceEvenly,
      crossAxisAlignment: CrossAxisAlignment.center,
    );
  }

  // Updated: Accept dynamic width
  Widget _buildPinCode(int i, BuildContext context, double boxWidth) {
    final bool isFilled = i < text.length && strList[i].isNotEmpty; // Check both conditions
    final bool isCurrent = i == currentIndex;
    final bool isFocused = hasFocus && isCurrent;

    Color bgColor = Colors.white;
    Color borderColor = Colors.white;
    Color textColor = Colors.black;

    if (widget.hasError) {
      borderColor = widget.errorBorderColor;
      bgColor = Colors.red.shade50;
    } else if (isFocused) {
      borderColor = Colors.transparent;
      bgColor = Colors.white;
      textColor = Colors.black; // Changed from white to black for better visibility
    } else if (isFilled) {
      borderColor = Colors.green;
      bgColor = Colors.green;
      textColor = Colors.white;
    }
    // When cleared/empty, colors remain as default initialized above

    return Container(
      key: ValueKey<String>("container$i"),
      alignment: Alignment.center,
      padding: EdgeInsets.zero,
      decoration: BoxDecoration(
        color: bgColor,
        border: Border.all(color: borderColor, width: 1),
        borderRadius: BorderRadius.circular(16),
      ),
      height: widget.pinBoxHeight,
      child: _animatedTextBox(
        strList[i],
        i,
        textColor,
      ),
    );
  }

  Widget _animatedTextBox(String text, int i, Color textColor) {
    final bool isFilled = text.isNotEmpty;
    final double fontSize = isFilled ? 50 : 50;
    final FontWeight fontWeight = isFilled ? FontWeight.w600 : FontWeight.normal;

    if (widget.pinTextAnimatedSwitcherTransition != null) {
      return AnimatedSwitcher(
        duration: widget.pinTextAnimatedSwitcherDuration,
        transitionBuilder: widget.pinTextAnimatedSwitcherTransition!,
        child: Text(
          text,
          softWrap: true,
          key: ValueKey<String>("$text$i"),
          style: widget.pinTextStyle?.copyWith(
            color: textColor,
            fontSize: fontSize,
            fontWeight: fontWeight,
            fontFamily: context.fontFamily,
          ) ??
              TextStyle(
                color: textColor,
                fontSize: fontSize,
                fontWeight: fontWeight,
                fontFamily: context.fontFamily,
              ),
        ),
      );
    } else {
      return Text(
        text,
        softWrap: true,
        key: ValueKey<String>("${strList[i]}$i"),
        style: widget.pinTextStyle?.copyWith(
          color: textColor,
          fontSize: fontSize,
          fontWeight: fontWeight,
          fontFamily: context.fontFamily,
        ) ??
            TextStyle(
              color: textColor,
              fontSize: fontSize,
              fontWeight: fontWeight,
              fontFamily: context.fontFamily,
            ),
      );
    }
  }
}

//
// Widget _animatedTextBox(String text, int i, Color textColor) {
//   if (widget.pinTextAnimatedSwitcherTransition != null) {
//     return AnimatedSwitcher(
//       duration: widget.pinTextAnimatedSwitcherDuration,
//       transitionBuilder: widget.pinTextAnimatedSwitcherTransition!,
//       child: Text(
//         text,
//         key: ValueKey<String>("$text$i"),
//         style: widget.pinTextStyle?.copyWith(color: textColor) ??
//             TextStyle(color: textColor, fontSize: 24, fontWeight: FontWeight.bold),
//       ),
//     );
//   } else {
//     return Text(
//       text,
//       key: ValueKey<String>("${strList[i]}$i"),
//       style: widget.pinTextStyle?.copyWith(color: textColor) ??
//           TextStyle(color: textColor, fontSize: 24, fontWeight: FontWeight.bold),
//     );
//   }
// }}