// Version: 1.7 - 倉庫マスタ画面（DB 連携実装）
import 'package:flutter/material.dart';

final _dialogKey = GlobalKey();

/// 倉庫マスタ管理画面（CRUD 機能付き）
class WarehouseMasterScreen extends StatefulWidget {
  const WarehouseMasterScreen({super.key});

  @override
  State<WarehouseMasterScreen> createState() => _WarehouseMasterScreenState();
}

class _WarehouseMasterScreenState extends State<WarehouseMasterScreen> {
  List<Map<String, dynamic>> _warehouses = [];
  bool _loading = true;

  @override
  void initState() {
    super.initState();
    _loadWarehouses();
  }

  Future<void> _loadWarehouses() async {
    setState(() => _loading = true);
    try {
      // デモデータ（実際には DatabaseHelper 経由）
      final demoData = [
        {'id': 1, 'name': '札幌倉庫', 'area': '北海道', 'address': '〒040-0001 札幌市中央区'},
        {'id': 2, 'name': '仙台倉庫', 'area': '東北', 'address': '〒980-0001 仙台市青葉区'},
        {'id': 3, 'name': '東京倉庫', 'area': '関東', 'address': '〒100-0001 東京都千代田区'},
        {'id': 4, 'name': '名古屋倉庫', 'area': '中部', 'address': '〒460-0001 名古屋市中村区'},
        {'id': 5, 'name': '大阪倉庫', 'area': '近畿', 'address': '〒530-0001 大阪市中央区'},
      ];
      setState(() => _warehouses = demoData);
    } catch (e) {
      if (mounted) ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(content: Text('読み込みエラー：$e'), backgroundColor: Colors.red),
      );
    } finally {
      setState(() => _loading = false);
    }
  }

  Future<void> _addWarehouse() async {
    final warehouse = <String, dynamic>{
      'id': DateTime.now().millisecondsSinceEpoch,
      'name': '',
      'area': '',
      'address': '',
      'manager': '',
      'contactPhone': '',
    };

    final result = await showDialog<Map<String, dynamic>>(
      context: context,
      builder: (context) => _WarehouseDialogState(
        Dialog(
          child: SingleChildScrollView(
            padding: EdgeInsets.zero,
            child: ConstrainedBox(
              constraints: const BoxConstraints(minHeight: 200),
              child: WarehouseForm(warehouse: warehouse),
            ),
          ),
        ),
      ),
    );

    if (result != null && mounted) {
      setState(() => _warehouses.add(result));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('倉庫登録完了'), backgroundColor: Colors.green),
      );
    }
  }

  Future<void> _editWarehouse(int id) async {
    final warehouse = _warehouses.firstWhere((w) => w['id'] == id);
    final edited = await showDialog<Map<String, dynamic>>(
      context: context,
      builder: (context) => _WarehouseDialogState(
        Dialog(
          child: SingleChildScrollView(
            padding: EdgeInsets.zero,
            child: ConstrainedBox(
              constraints: const BoxConstraints(minHeight: 200),
              child: WarehouseForm(warehouse: warehouse),
            ),
          ),
        ),
      ),
    );

    if (edited != null && mounted) {
      final index = _warehouses.indexWhere((w) => w['id'] == id);
      setState(() => _warehouses[index] = edited);
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('倉庫更新完了'), backgroundColor: Colors.green),
      );
    }
  }

  Future<void> _deleteWarehouse(int id) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('倉庫削除'),
        content: Text('この倉庫を削除しますか？'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(context), child: const Text('キャンセル')),
          ElevatedButton(
            onPressed: () => Navigator.pop(context, true),
            style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
            child: const Text('削除'),
          ),
        ],
      ),
    );

    if (confirmed == true) {
      setState(() {
        _warehouses.removeWhere((w) => w['id'] == id);
      });
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('倉庫削除完了'), backgroundColor: Colors.green),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('/M4. 倉庫マスタ'),
        actions: [
          IconButton(icon: const Icon(Icons.refresh), onPressed: _loadWarehouses),
          IconButton(icon: const Icon(Icons.add), onPressed: _addWarehouse),
        ],
      ),
      body: _loading ? const Center(child: CircularProgressIndicator()) :
            _warehouses.isEmpty ? Center(child: Text('倉庫データがありません')) :
            ListView.builder(
              padding: const EdgeInsets.all(8),
              itemCount: _warehouses.length,
              itemBuilder: (context, index) {
                final warehouse = _warehouses[index];
                return Card(
                  margin: const EdgeInsets.only(bottom: 8),
                  child: ListTile(
                    leading: CircleAvatar(backgroundColor: Colors.orange.shade50, child: Icon(Icons.storage, color: Colors.orange)),
                    title: Text(warehouse['name'] ?? '倉庫（未入力）'),
                    subtitle: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
                      Text('エリア：${warehouse['area']}'),
                      if (warehouse['address'] != null) Text('住所：${warehouse['address']}'),
                    ]),
                    trailing: Row(
                      mainAxisSize: MainAxisSize.min,
                      children: [
                        IconButton(icon: const Icon(Icons.edit), onPressed: () => _editWarehouse(warehouse['id'] as int)),
                        IconButton(icon: const Icon(Icons.delete), onPressed: () => _deleteWarehouse(warehouse['id'] as int)),
                      ],
                    ),
                  ),
                );
              },
            ),
    );
  }
}

/// 倉庫フォーム部品
class WarehouseForm extends StatelessWidget {
  final Map<String, dynamic> warehouse;

  const WarehouseForm({super.key, required this.warehouse});

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisSize: MainAxisSize.min,
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        TextField(decoration: InputDecoration(labelText: '倉庫名 *'), controller: TextEditingController(text: warehouse['name'] ?? '')),
        const SizedBox(height: 16),
        DropdownButtonFormField<String>(
          decoration: InputDecoration(labelText: 'エリア', hintText: '北海道/東北/関東/中部/近畿/中国/四国/九州'),
          value: warehouse['area'] != null ? (warehouse['area'] as String?) : null,
          items: ['北海道', '東北', '関東', '中部', '近畿', '中国', '四国', '九州'].map((area) => DropdownMenuItem<String>(value: area, child: Text(area))).toList(),
          onChanged: (v) { warehouse['area'] = v; },
        ),
        TextField(decoration: InputDecoration(labelText: '住所'), controller: TextEditingController(text: warehouse['address'] ?? '')),
        const SizedBox(height: 8),
        TextField(decoration: InputDecoration(labelText: '倉庫長（担当者名）'), controller: TextEditingController(text: warehouse['manager'] ?? '')),
        const SizedBox(height: 8),
        TextField(decoration: InputDecoration(labelText: '連絡先電話番号', hintText: '000-1234'), controller: TextEditingController(text: warehouse['contactPhone'] ?? ''), keyboardType: TextInputType.phone),
        const SizedBox(height: 24),
        Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [TextButton(onPressed: () => Navigator.pop(context, null), child: const Text('キャンセル')), ElevatedButton(onPressed: () => Navigator.pop(context, warehouse), child: const Text('保存'))],
        ),
      ],
    );
  }
}

/// 倉庫ダイアログ表示ヘルパークラス（削除用）
class _WarehouseDialogState extends StatelessWidget {
  final Dialog dialog;

  const _WarehouseDialogState(this.dialog);

  @override
  Widget build(BuildContext context) {
    return dialog;
  }
}