import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import '../theme.dart';
import '../../l10n/tr.dart';
import '../setting_tile.dart';

// 약속 (설정 B): 환경 설정 분야들이 같이 쓰는 줄 - 작은 제목 · 글 넣는 줄 · 폴더 고르는 줄 · 개수 고르기 (1 · 5 · 10 · 무한 · 직접)

/// 묶음 안의 작은 제목
Widget settingsSubTitle(String t) => Padding(
      padding: const EdgeInsets.fromLTRB(16, 12, 16, 0),
      child: Text(t, style: TextStyle(fontSize: 13, color: JjColors.accent, fontWeight: FontWeight.w600)),
    );

/// 글 넣는 줄 - 칸을 벗어나거나 Enter · 바꿀 때마다 저장
Widget settingsTextTile(String title, String value, String hint, ValueChanged<String> onSave,
        {bool obscure = false}) =>
    SettingTile(
      title: Text(title),
      subtitle: Text(hint),
      trailing: SizedBox(
        width: 320,
        child: TextFormField(
          initialValue: value,
          obscureText: obscure,
          decoration: const InputDecoration(isDense: true, border: OutlineInputBorder()),
          // 입력칸을 벗어나거나 Enter 를 누르면 저장
          onFieldSubmitted: onSave,
          onTapOutside: (_) => FocusManager.instance.primaryFocus?.unfocus(),
          onChanged: onSave,
        ),
      ),
    );

/// 폴더 고르는 줄 - [폴더 선택] · 고른 것이 있으면 [기본값]
Widget settingsFolderTile({
  required String title,
  required String? value,
  required String defaultText,
  required VoidCallback onPick,
  required VoidCallback onReset,
}) =>
    SettingTile(
      title: Text(title),
      subtitle: Text(value ?? defaultText, maxLines: 2, overflow: TextOverflow.ellipsis),
      trailing: Row(mainAxisSize: MainAxisSize.min, children: [
        OutlinedButton(onPressed: onPick, child: Text(tr('폴더 선택'))),
        if (value != null) ...[
          const SizedBox(width: 6),
          TextButton(onPressed: onReset, child: Text(tr('기본값'))),
        ],
      ]),
    );

/// 동시 작업 수 고르기: 1 · 5 · 10 · 무한(0) · 직접 입력
class CountSelector extends StatelessWidget {
  final int value;
  final ValueChanged<int> onChanged;
  const CountSelector({super.key, required this.value, required this.onChanged});

  static const _presets = [1, 5, 10, 0];
  static String label(int n) => n <= 0 ? tr('무한') : trf('{0}개', [n]);

  Future<void> _custom(BuildContext context) async {
    // 목록 메뉴가 완전히 닫힌 뒤 입력 창을 연다
    await Future<void>.delayed(Duration.zero);
    if (!context.mounted) return;
    final n = await showDialog<int>(
      context: context,
      builder: (_) => _CountInputDialog(initial: value),
    );
    if (n != null && n >= 0) onChanged(n);
  }

  @override
  Widget build(BuildContext context) {
    final items = {..._presets, value};
    return DropdownButton<int>(
      value: value,
      items: [
        for (final n in items) DropdownMenuItem(value: n, child: Text(label(n))),
        DropdownMenuItem(value: -1, child: Text(tr('직접 입력…'))),
      ],
      onChanged: (n) => n == -1 ? _custom(context) : onChanged(n!),
    );
  }
}

/// 개수 직접 입력 창 (입력칸은 창이 닫히는 애니메이션이 끝난 뒤 정리)
class _CountInputDialog extends StatefulWidget {
  final int initial;
  const _CountInputDialog({required this.initial});

  @override
  State<_CountInputDialog> createState() => _CountInputDialogState();
}

class _CountInputDialogState extends State<_CountInputDialog> {
  late final _ctrl = TextEditingController(text: widget.initial > 0 ? '${widget.initial}' : '');

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

  @override
  Widget build(BuildContext context) => AlertDialog(
        scrollable: true,
        title: Text(tr('직접 입력')),
        content: TextField(
          controller: _ctrl,
          autofocus: true,
          keyboardType: TextInputType.number,
          inputFormatters: [FilteringTextInputFormatter.digitsOnly],
          decoration: InputDecoration(labelText: tr('동시에 처리할 개수 (0 = 무한)'), border: OutlineInputBorder()),
          onSubmitted: (t) => Navigator.pop(context, int.tryParse(t)),
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(context), child: Text(tr('취소'))),
          FilledButton(onPressed: () => Navigator.pop(context, int.tryParse(_ctrl.text)), child: Text(tr('확인'))),
        ],
      );
}