part of 'dialog.dart';

/// Papan angka desimal untuk produk yang dijual per timbangan.
///
/// Satu kali dialog ini ditutup dengan angka = satu penimbangan = satu baris
/// keranjang. Untuk mengoreksi salah timbang, buka lagi baris yang sama lewat
/// [initialWeight] alih-alih menambah baris baru.
class WeightInputDialog extends StatefulWidget {
  final Product product;
  final ProductVariant? variant;
  final double? initialWeight;
  final ValueChanged<double> onSubmit;

  const WeightInputDialog({
    super.key,
    required this.product,
    required this.onSubmit,
    this.variant,
    this.initialWeight,
  });

  /// Berat terkecil yang diterima backend; di bawah ini membulat ke nol.
  static const double minWeight = 0.001;

  /// Backend membulatkan berat ke 3 desimal.
  static const int maxDecimals = 3;

  @override
  State<WeightInputDialog> createState() => _WeightInputDialogState();
}

class _WeightInputDialogState extends State<WeightInputDialog> {
  /// Angka disimpan sebagai teks supaya "4," dan "4,20" bisa diketik utuh
  /// tanpa dinormalisasi di tengah pengetikan.
  late String _input = _formatInitial(widget.initialWeight);

  static String _formatInitial(double? weight) {
    if (weight == null || weight <= 0) return '';
    return weight
        .toStringAsFixed(WeightInputDialog.maxDecimals)
        .replaceFirst(RegExp(r'\.?0+$'), '')
        .replaceAll('.', ',');
  }

  double get _weight => double.tryParse(_input.replaceAll(',', '.')) ?? 0;

  bool get _isValid => _weight >= WeightInputDialog.minWeight;

  double get _unitPrice =>
      widget.product.price + (widget.variant?.priceModifier ?? 0);

  String get _unitLabel => widget.product.unitLabel;

  void _tapDigit(String digit) {
    final separatorIndex = _input.indexOf(',');
    if (separatorIndex != -1 &&
        _input.length - separatorIndex - 1 >= WeightInputDialog.maxDecimals) {
      return;
    }

    setState(() {
      // Hindari "007": nol di depan hanya berarti sesuatu sebelum koma.
      _input = _input == '0' ? digit : '$_input$digit';
    });
  }

  void _tapSeparator() {
    if (_input.contains(',')) return;
    setState(() => _input = _input.isEmpty ? '0,' : '$_input,');
  }

  void _tapBackspace() {
    if (_input.isEmpty) return;
    setState(() => _input = _input.substring(0, _input.length - 1));
  }

  void _tapClear() => setState(() => _input = '');

  void _submit() {
    if (!_isValid) return;
    final rounded = double.parse(
      _weight.toStringAsFixed(WeightInputDialog.maxDecimals),
    );
    context.maybePop();
    widget.onSubmit(rounded);
  }

  @override
  Widget build(BuildContext context) {
    return CustomModalDialog(
      title: widget.product.name,
      subtitle: _unitLabel.isEmpty
          ? 'Masukkan berat'
          : 'Masukkan berat dalam $_unitLabel',
      minWidth: 380,
      maxWidth: 420,
      minHeight: 0,
      contentPadding: const EdgeInsets.all(16),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          _buildDisplay(),
          const SpaceHeight(16),
          _buildKeypad(),
          const SpaceHeight(16),
          AppElevatedButton.filled(
            borderRadius: 12,
            disabled: !_isValid,
            onPressed: _submit,
            label: widget.initialWeight == null
                ? 'Tambah ke Pesanan'
                : 'Simpan Berat',
          ),
          if (_input.isNotEmpty && !_isValid) ...[
            const SpaceHeight(8),
            Text(
              'Berat minimal 0,001${_unitLabel.isEmpty ? '' : ' $_unitLabel'}',
              textAlign: TextAlign.center,
              style: AppStyle.sm.copyWith(color: AppColor.error),
            ),
          ],
        ],
      ),
    );
  }

  Widget _buildDisplay() {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      decoration: BoxDecoration(
        color: AppColor.primary.withOpacity(0.06),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: AppColor.primary.withOpacity(0.3)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            crossAxisAlignment: CrossAxisAlignment.baseline,
            textBaseline: TextBaseline.alphabetic,
            children: [
              Expanded(
                child: Text(
                  _input.isEmpty ? '0' : _input,
                  textAlign: TextAlign.right,
                  style: AppStyle.xxl.copyWith(
                    fontSize: 40,
                    fontWeight: FontWeight.bold,
                    color: _input.isEmpty
                        ? AppColor.textSecondary
                        : AppColor.black,
                  ),
                ),
              ),
              if (_unitLabel.isNotEmpty) ...[
                const SpaceWidth(8),
                Text(
                  _unitLabel,
                  style: AppStyle.lg.copyWith(color: AppColor.textSecondary),
                ),
              ],
            ],
          ),
          const SpaceHeight(4),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                '${_unitPrice.currencyFormatRpV2}'
                '${_unitLabel.isEmpty ? '' : ' / $_unitLabel'}',
                style: AppStyle.sm.copyWith(color: AppColor.textSecondary),
              ),
              Text(
                (_unitPrice * _weight).currencyFormatRpV2,
                style: AppStyle.lg.copyWith(
                  fontWeight: FontWeight.bold,
                  color: AppColor.primary,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildKeypad() {
    const keys = [
      ['1', '2', '3'],
      ['4', '5', '6'],
      ['7', '8', '9'],
      [',', '0', 'hapus'],
    ];

    return Column(
      children: [
        for (final row in keys)
          Padding(
            padding: const EdgeInsets.only(bottom: 8),
            child: Row(
              children: [
                for (final key in row)
                  Expanded(
                    child: Padding(
                      padding: const EdgeInsets.symmetric(horizontal: 4),
                      child: _KeypadButton(
                        label: key,
                        onTap: () {
                          switch (key) {
                            case ',':
                              _tapSeparator();
                            case 'hapus':
                              _tapBackspace();
                            default:
                              _tapDigit(key);
                          }
                        },
                        // Tahan lama untuk mengosongkan angka sekaligus.
                        onLongPress: key == 'hapus' ? _tapClear : null,
                      ),
                    ),
                  ),
              ],
            ),
          ),
      ],
    );
  }
}

class _KeypadButton extends StatelessWidget {
  final String label;
  final VoidCallback onTap;
  final VoidCallback? onLongPress;

  const _KeypadButton({
    required this.label,
    required this.onTap,
    this.onLongPress,
  });

  @override
  Widget build(BuildContext context) {
    final isBackspace = label == 'hapus';

    return InkWell(
      onTap: onTap,
      onLongPress: onLongPress,
      borderRadius: BorderRadius.circular(12),
      child: Container(
        height: 56,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          color: AppColor.white,
          borderRadius: BorderRadius.circular(12),
          border: Border.all(color: AppColor.border),
        ),
        child: isBackspace
            ? const Icon(Icons.backspace_outlined, color: AppColor.primary)
            : Text(
                label,
                style: AppStyle.xxl.copyWith(fontWeight: FontWeight.w600),
              ),
      ),
    );
  }
}