// Version: 1.9 - 倉庫マスタ画面（簡素版として維持）
// ※ DB モデルと同期していないため簡素版のまま

import 'package:flutter/material.dart';

/// 倉庫マスタ管理画面（CRUD 機能付き - 簡素版）
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 {
      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': ''};

    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（簡素版）
class WarehouseForm extends StatelessWidget {
  final Map<String, dynamic> warehouse;

  const