import 'package:flutter/material.dart';

class NumpadPinInputWidget extends StatefulWidget {
  final void Function(String key) onKey;
  final VoidCallback onSimpan;
  final VoidCallback? onVerifikasiPassword;
  final TextEditingController displayController;
  final int maxLength;
  final String title;

  const NumpadPinInputWidget({
    super.key,
    required this.onKey,
    required this.onSimpan,
    required this.displayController,
    this.onVerifikasiPassword,
    this.maxLength = 6,
    this.title = 'Masukkan PIN',
  });

  static void show(
    BuildContext context, {
    required TextEditingController controller,
    required void Function(String key) onKey,
    required VoidCallback onSimpan,
    VoidCallback? onVerifikasiPassword,
    int maxLength = 6,
    String title = 'Masukkan PIN',
  }) {
    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.white,
      isScrollControlled: true,
      isDismissible: false,
      enableDrag: false,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(24)),
      ),
      builder: (_) => NumpadPinInputWidget(
        displayController: controller,
        onKey: onKey,
        onSimpan: onSimpan,
        onVerifikasiPassword: onVerifikasiPassword,
        maxLength: maxLength,
        title: title,
      ),
    );
  }

  @override
  State<NumpadPinInputWidget> createState() => NumpadPinInputWidgetState();
}

class NumpadPinInputWidgetState extends State<NumpadPinInputWidget>
    with SingleTickerProviderStateMixin {
  String _errorMessage = '';
  bool _hasError = false;
  bool _showVerifikasiPassword = false;

  late AnimationController _shakeController;
  late Animation<Offset> _shakeAnimation;

  static const _primaryColor = Color(0xFF5B9BD5);

  @override
  void initState() {
    super.initState();
    _shakeController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 500),
    );
    _shakeAnimation =
        TweenSequence<Offset>([
          TweenSequenceItem(
            tween: Tween(begin: Offset.zero, end: const Offset(-0.05, 0)),
            weight: 1,
          ),
          TweenSequenceItem(
            tween: Tween(
              begin: const Offset(-0.05, 0),
              end: const Offset(0.05, 0),
            ),
            weight: 2,
          ),
          TweenSequenceItem(
            tween: Tween(
              begin: const Offset(0.05, 0),
              end: const Offset(-0.05, 0),
            ),
            weight: 2,
          ),
          TweenSequenceItem(
            tween: Tween(
              begin: const Offset(-0.05, 0),
              end: const Offset(0.05, 0),
            ),
            weight: 2,
          ),
          TweenSequenceItem(
            tween: Tween(begin: const Offset(0.05, 0), end: Offset.zero),
            weight: 1,
          ),
        ]).animate(
          CurvedAnimation(parent: _shakeController, curve: Curves.easeInOut),
        );
  }

  @override
  void dispose() {
    _shakeController.dispose();
    super.dispose();
  }

  void showError(String message, {bool showVerifikasiPassword = false}) {
    widget.displayController.clear();
    setState(() {
      _errorMessage = message;
      _hasError = true;
      if (showVerifikasiPassword) _showVerifikasiPassword = true;
    });
    _shakeController.forward(from: 0);
  }

  void _clearError() {
    if (!_hasError) return;
    setState(() {
      _errorMessage = '';
      _hasError = false;
    });
  }

  void _onKey(String key) {
    _clearError();
    widget.onKey(key);
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: EdgeInsets.fromLTRB(
        16,
        12,
        16,
        MediaQuery.of(context).viewInsets.bottom + 24,
      ),
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          _buildHandle(),
          _buildTitle(),
          const SizedBox(height: 20),
          _buildDotIndicator(),
          _buildErrorMessage(),
          _buildVerifikasiPasswordLink(),
          const SizedBox(height: 16),
          _buildNumpad(),
          const SizedBox(height: 12),
          _buildSimpanButton(),
        ],
      ),
    );
  }

  Widget _buildHandle() {
    return Container(
      width: 40,
      height: 4,
      margin: const EdgeInsets.only(bottom: 16),
      decoration: BoxDecoration(
        color: Colors.grey.shade300,
        borderRadius: BorderRadius.circular(2),
      ),
    );
  }

  Widget _buildTitle() {
    return Text(
      widget.title,
      style: const TextStyle(
        fontSize: 18,
        fontWeight: FontWeight.bold,
        color: Colors.black87,
      ),
    );
  }

  Widget _buildDotIndicator() {
    return SlideTransition(
      position: _shakeAnimation,
      child: ValueListenableBuilder<TextEditingValue>(
        valueListenable: widget.displayController,
        builder: (_, value, __) {
          return Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: List.generate(widget.maxLength, (i) {
              final filled = i < value.text.length;
              return Container(
                margin: const EdgeInsets.symmetric(horizontal: 8),
                width: 14,
                height: 14,
                decoration: BoxDecoration(
                  shape: BoxShape.circle,
                  color: _hasError
                      ? Colors.red.shade400
                      : filled
                      ? _primaryColor
                      : Colors.grey.shade300,
                ),
              );
            }),
          );
        },
      ),
    );
  }

  Widget _buildErrorMessage() {
    return AnimatedSwitcher(
      duration: const Duration(milliseconds: 200),
      child: _errorMessage.isNotEmpty
          ? Padding(
              key: ValueKey(_errorMessage),
              padding: const EdgeInsets.only(top: 10),
              child: Text(
                _errorMessage,
                style: TextStyle(
                  color: Colors.red.shade600,
                  fontSize: 13,
                  fontWeight: FontWeight.w500,
                ),
                textAlign: TextAlign.center,
              ),
            )
          : const SizedBox(height: 10, key: ValueKey('_empty')),
    );
  }

  Widget _buildVerifikasiPasswordLink() {
    if (widget.onVerifikasiPassword == null) return const SizedBox.shrink();

    return AnimatedSwitcher(
      duration: const Duration(milliseconds: 200),
      child: _showVerifikasiPassword
          ? Padding(
              key: const ValueKey('_verifikasiPassword'),
              padding: const EdgeInsets.only(top: 6, bottom: 4),
              child: GestureDetector(
                onTap: widget.onVerifikasiPassword,
                child: const Text(
                  'Masukkan Password Akun',
                  style: TextStyle(
                    color: _primaryColor,
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    decoration: TextDecoration.underline,
                  ),
                ),
              ),
            )
          : const SizedBox(key: ValueKey('_noVerifikasi')),
    );
  }

  Widget _buildNumpad() {
    final keys = ['1', '2', '3', '4', '5', '6', '7', '8', '9', '', '0', 'del'];

    return GridView.builder(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      itemCount: keys.length,
      gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
        crossAxisCount: 3,
        mainAxisSpacing: 8,
        crossAxisSpacing: 8,
        childAspectRatio: 1.6,
      ),
      itemBuilder: (_, i) {
        final key = keys[i];
        if (key.isEmpty) return const SizedBox();

        return GestureDetector(
          onTap: () => _onKey(key),
          child: Container(
            decoration: const BoxDecoration(
              color: Color(0xFFF2F2F2),
              shape: BoxShape.circle,
            ),
            child: Center(
              child: key == 'del'
                  ? const Icon(
                      Icons.backspace_outlined,
                      color: Colors.black87,
                      size: 20,
                    )
                  : Text(
                      key,
                      style: const TextStyle(
                        fontSize: 20,
                        fontWeight: FontWeight.w600,
                        color: Colors.black87,
                      ),
                    ),
            ),
          ),
        );
      },
    );
  }

  Widget _buildSimpanButton() {
    return ValueListenableBuilder<TextEditingValue>(
      valueListenable: widget.displayController,
      builder: (_, value, __) {
        final isReady = value.text.length == widget.maxLength;
        return GestureDetector(
          onTap: isReady ? widget.onSimpan : null,
          child: Container(
            width: double.infinity,
            padding: const EdgeInsets.symmetric(vertical: 14),
            decoration: BoxDecoration(
              color: isReady ? _primaryColor : Colors.grey.shade300,
              borderRadius: BorderRadius.circular(12),
            ),
            child: Center(
              child: Text(
                'Simpan',
                style: TextStyle(
                  color: isReady ? Colors.white : Colors.black45,
                  fontWeight: FontWeight.bold,
                  fontSize: 16,
                ),
              ),
            ),
          ),
        );
      },
    );
  }
}