// Version: 3.0 - シンプル仕入先マスタ画面（簡素版、サンプルデータ固定）

import 'package:flutter/material.dart';

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

  @override
  State<SupplierMasterScreen> createState() => _SupplierMasterScreenState();
}

class _SupplierMasterScreenState extends State<SupplierMasterScreen> {
  List<dynamic> _suppliers = [];

  @override
  void initState() {
    super.initState();
    // サンプルデータ（簡素版）
    _suppliers = [
      {'supplier_code': 'S001', 'name': 'サンプル仕入先 A'},
      {'supplier_code': 'S002', 'name': 'サンプル仕入先 B'},
    ];
  }

  Future<void> _addSupplier() async {
    showDialog<Map<String, dynamic>>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('新規仕入先登録'),
        content: SingleChildScrollView(
          child: Column(
            mainAxisSize: MainAxisSize.min,
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: [
              TextField(decoration: const InputDecoration(labelText: 'コード', hintText: 'S003')),
              SizedBox(height: 8),
              TextField(decoration: const InputDecoration(labelText: '名称', hintText: '新仕入先名')),
              SizedBox(height: 8),
              TextField(decoration: const InputDecoration(labelText: '住所', hintText: '住所を入力')),
              SizedBox(height: 8),
              TextField(decoration: const InputDecoration(labelText: '電話番号', hintText: '03-1234-5678'), keyboardType: TextInputType.phone),
            ],
          ),
        ),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx), child: const Text('キャンセル')),
          ElevatedButton(
            onPressed: () {
              Navigator.pop(ctx);
            },
            child: const Text('登録'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('/M1. 仕入先マスタ')),
      body: _suppliers.isEmpty ? Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(Icons.inbox_outlined, size: 64, color: Colors.grey[300]),
            SizedBox(height: 16),
            Text('仕入先データがありません', style: TextStyle(color: Colors.grey)),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: _addSupplier,
              child: const Text('新規登録'),
            ),
          ],
        ),
      ) : ListView.builder(
        padding: const EdgeInsets.all(8),
        itemCount: _suppliers.length,
        itemBuilder: (context, index) {
          final supplier = _suppliers[index];
          return Card(
            margin: EdgeInsets.zero,
            clipBehavior: Clip.antiAlias,
            child: ListTile(
              leading: CircleAvatar(
                backgroundColor: Colors.orange.shade100,
                child: Text(supplier['supplier_code'] ?? '-', style: const TextStyle(fontWeight: FontWeight.bold)),
              ),
              title: Text(supplier['name'] ?? '未入力'),
            ),
          );
        },
      ),
      floatingActionButton: FloatingActionButton.extended(
        icon: const Icon(Icons.add),
        label: const Text('新規登録'),
        onPressed: _addSupplier,
      ),
    );
  }
}