import '../core/utils/dialog_util.dart';
import 'package:flutter/material.dart';
import '../core/responsive/responsive.dart';
import 'package:lpinyin/lpinyin.dart';
import '../core/theme/app_theme.dart';

class OptionItem {
  final int id;
  final String name;
  final String? code;
  // 拼音索引，构造时预计算
  late final String _fullPinyin;
  late final String _initials;

  OptionItem({required this.id, required this.name, this.code}) {
    _fullPinyin = PinyinHelper.getPinyinE(name, separator: '', defPinyin: '').toLowerCase();
    _initials   = PinyinHelper.getShortPinyin(name).toLowerCase();
  }

  bool matches(String kw) {
    final k = kw.toLowerCase();
    return name.toLowerCase().contains(k) ||
        (_fullPinyin.isNotEmpty && _fullPinyin.contains(k)) ||
        (_initials.isNotEmpty && _initials.contains(k)) ||
        (code?.toLowerCase().contains(k) ?? false);
  }
}

/// 点击后弹出搜索对话框的下拉选择框
class SearchableOptionField extends StatelessWidget {
  final List<OptionItem> options;
  final int? selectedId;
  final String hint;
  final String dialogTitle;
  final ValueChanged<int?> onChanged;
  final bool isRequired;
  final bool isDense;

  const SearchableOptionField({
    super.key,
    required this.options,
    required this.selectedId,
    required this.hint,
    required this.dialogTitle,
    required this.onChanged,
    this.isRequired = false,
    this.isDense = true,
  });

  String get _displayText {
    if (selectedId == null) return '';
    return options.where((o) => o.id == selectedId).firstOrNull?.name ?? '';
  }

  Future<void> _openDialog(BuildContext context) async {
    final result = await showDialog<int?>(
      context: context,
      builder: (_) => _SearchDialog(
        title: dialogTitle,
        options: options,
        selectedId: selectedId,
      ),
    );
    // result == -1 means "clear selection"
    if (result == -1) {
      onChanged(null);
    } else if (result != null) {
      onChanged(result);
    }
  }

  @override
  Widget build(BuildContext context) {
    final selected = selectedId != null;
    return FormField<int>(
      initialValue: selectedId,
      validator: isRequired ? (v) => (selectedId == null ? '请选择' : null) : null,
      builder: (state) {
        return InkWell(
          onTap: () => _openDialog(context),
          borderRadius: BorderRadius.circular(4),
          child: InputDecorator(
            decoration: InputDecoration(
              isDense: isDense,
              errorText: state.errorText,
              suffixIcon: selected
                  ? GestureDetector(
                      onTap: () => onChanged(null),
                      child: const Icon(Icons.close, size: 14, color: AppTheme.textSecondary),
                    )
                  : const Icon(Icons.arrow_drop_down, size: 16, color: AppTheme.textSecondary),
            ),
            isEmpty: !selected,
            child: Text(
              selected ? _displayText : hint,
              style: TextStyle(
                fontSize: 12,
                color: selected ? Colors.black87 : AppTheme.textSecondary,
              ),
              overflow: TextOverflow.ellipsis,
            ),
          ),
        );
      },
    );
  }
}

class _SearchDialog extends StatefulWidget {
  final String title;
  final List<OptionItem> options;
  final int? selectedId;
  const _SearchDialog({required this.title, required this.options, this.selectedId});

  @override
  State<_SearchDialog> createState() => _SearchDialogState();
}

class _SearchDialogState extends State<_SearchDialog> {
  final _ctrl = TextEditingController();
  String _keyword = '';

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

  @override
  Widget build(BuildContext context) {
    final filtered = _keyword.isEmpty
        ? widget.options
        : widget.options.where((o) => o.matches(_keyword)).toList();

    return AlertDialog(
      title: Text(widget.title, style: const TextStyle(fontSize: 16)),
      contentPadding: const EdgeInsets.fromLTRB(16, 12, 16, 0),
      content: SizedBox(
        width: context.dialogWidth(300),
        height: 400,
        child: Column(
          children: [
            TextField(
              controller: _ctrl,
              autofocus: true,
              decoration: const InputDecoration(
                hintText: '搜索...',
                prefixIcon: Icon(Icons.search, size: 18),
                isDense: true,
              ),
              onChanged: (v) => setState(() => _keyword = v),
            ),
            const SizedBox(height: 8),
            Expanded(
              child: filtered.isEmpty
                  ? const Center(
                      child: Text('无匹配结果', style: TextStyle(color: AppTheme.textSecondary)))
                  : ListView.builder(
                      itemCount: filtered.length,
                      itemBuilder: (_, i) {
                        final opt = filtered[i];
                        final isSelected = opt.id == widget.selectedId;
                        return ListTile(
                          dense: true,
                          title: Text(opt.name, style: const TextStyle(fontSize: 13)),
                          subtitle: opt.code != null && opt.code!.isNotEmpty
                              ? Text(opt.code!, style: const TextStyle(fontSize: 11))
                              : null,
                          selected: isSelected,
                          selectedTileColor: AppTheme.primary.withValues(alpha: 0.08),
                          onTap: () => Navigator.of(context).pop(opt.id),
                        );
                      },
                    ),
            ),
          ],
        ),
      ),
      actions: [
        if (widget.selectedId != null)
          TextButton(
            onPressed: () => Navigator.of(context).pop(-1),
            child: const Text('清除选择', style: TextStyle(color: AppTheme.textSecondary)),
          ),
        TextButton(
          onPressed: () => Navigator.of(context).pop(null),
          child: const Text('取消'),
        ),
      ],
    );
  }
}