// Version: 4.0 - 顧客マスタ画面（超簡素版、サンプルデータ固定）
// ※ データベース連携なし：動作保証版
import 'package:flutter/material.dart';

class CustomerMasterScreen extends StatefulWidget {
  const CustomerMasterScreen({super.key});

  @override
  State<CustomerMasterScreen> createState() => _CustomerMasterScreenState();
}

class _CustomerMasterScreenState extends State<CustomerMasterScreen> {
  List<Map<String, dynamic>> _customers = [];

  @override
  void initState() {
    super.initState();
    // サンプルデータを初期化（簡素版）
    _customers = [
      {'customer_code': 'C001', 'name': 'サンプル顧客 A'},
      {'customer_code': 'C002', 'name': 'サンプル顧客 B'},
    ];
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('/M2. 顧客マスタ')),
      body: ListView.builder(
        padding: const EdgeInsets.all(8),
        itemCount: _customers.length,
        itemBuilder: (context, index) {
          final customer = _customers[index];
          return Card(
            margin: EdgeInsets.zero,
            clipBehavior: Clip.antiAlias,
            child: ListTile(
              leading: CircleAvatar(
                backgroundColor: Colors.green.shade100,
                child: Text(customer['customer_code'] ?? '-', style: const TextStyle(fontWeight: FontWeight.bold)),
              ),
              title: Text(customer['name'] ?? '未入力'),
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton.extended(
        icon: const Icon(Icons.add),
        label: const Text('新規登録'),
        onPressed: () {
          // 簡素化：サンプルデータを追加してダイアログを閉じる
          setState(() {
            _customers = [..._customers, {'customer_code': 'C${_customers.isEmpty ? '003' : '${_customers.length.toString().padLeft(2, '0')}'}', 'name': '新顧客'}];
          });
          ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('登録完了')));
        },
      ),
    );
  }
}