// version: 1.4.3c (Bug Fix: PDF layout error)
import 'dart:io';
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

import 'package:flutter_contacts/flutter_contacts.dart';
import 'package:share_plus/share_plus.dart';
import 'package:open_filex/open_filex.dart';
import 'package:pdf/widgets.dart' as pw;
import 'package:path_provider/path_provider.dart';
import 'package:crypto/crypto.dart';
import 'package:intl/intl.dart';

void main() => runApp(const MaterialApp(home: InvoiceApp()));

class InvoiceApp extends StatefulWidget {
  const InvoiceApp({super.key});
  @override
  State<InvoiceApp> createState() => _InvoiceAppState();
}

class _InvoiceAppState extends State<InvoiceApp> {
  final _clientController = TextEditingController(text: "佐々木製作所");
  final _amountController = TextEditingController(text: "250000");
  String _status = "内容を入力してPDFを発行してください";
  String? _lastFilePath;

  Future<void> _pickContact() async {
    setState(() => _status = "連絡先をスキャン中...");
    try {
      if (await FlutterContacts.requestPermission()) {
        final List<Contact> contacts = await FlutterContacts.getContacts(
          withProperties: false,
          withThumbnail: false,
        );

        if (!mounted) return;

        if (contacts.isEmpty) {
          setState(() => _status = "連絡先が空、または取得できませんでした。");
          return;
        }

        final Contact? selected = await showDialog<Contact>(
          context: context,
          builder: (ctx) => AlertDialog(
            title: Text("取引先を選択 (${contacts.length}件)"),
            content: SizedBox(
              width: double.maxFinite,
              height: 400,
              child: ListView.builder(
                itemCount: contacts.length,
                itemBuilder: (c, i) => ListTile(
                  leading: const CircleAvatar(child: Icon(Icons.person)),
                  title: Text(contacts[i].displayName),
                  onTap: () => Navigator.pop(c, contacts[i]),
                ),
              ),
            ),
          ),
        );

        if (selected != null) {
          setState(() {
            _clientController.text = selected.displayName;
            _status = "「${selected.displayName}」をセットしました";
          });
        }
      } else {
        setState(() => _status = "電話帳の権限が拒否されています。");
      }
    } catch (e) {
      setState(() => _status = "エラーが発生しました: $e");
    }
  }

  Future<void> _methodDirectOpen() async {
    if (_lastFilePath != null) {
      await OpenFilex.open(_lastFilePath!);
    }
  }

  Future<void> _methodShare() async {
    if (_lastFilePath != null) {
      await Share.shareXFiles([XFile(_lastFilePath!)], text: '請求書送付');
    }
  }

  Future<void> _generateInvoice() async {
    final pdf = pw.Document();
    final fontData = await rootBundle.load("assets/fonts/ipaexg.ttf");
    final ttf = pw.Font.ttf(fontData);

    final clientName = _clientController.text;
    final int unitPrice = int.tryParse(_amountController.text) ?? 0;
    final int total = (unitPrice * 1.1).floor();

    final now = DateTime.now();
    final dateFileStr = DateFormat('yyyyMMdd').format(now);
    final amountFormatter = NumberFormat("#,###");

    pdf.addPage(pw.Page(
      theme: pw.ThemeData.withFont(base: ttf, bold: ttf),
      build: (context) => pw.Center(
        child: pw.Column(
          // --- ここを修正しました ---
          mainAxisAlignment: pw.MainAxisAlignment.center,
          children: [
            pw.Text("請求書", style: pw.TextStyle(fontSize: 24)),
            pw.SizedBox(height: 20),
            pw.Text("宛名: $clientName 様"),
            pw.Text("合計金額: ${amountFormatter.format(total)} 円 (税込)"),
            pw.SizedBox(height: 10),
            pw.Text("日付: ${DateFormat('yyyy/MM/dd').format(now)}"),
          ],
        )
      ),
    ));

    final Uint8List bytes = await pdf.save();
    final String hash = sha256.convert(bytes).toString().substring(sha256.convert(bytes).toString().length - 8);

    String fileName = "${dateFileStr}(請求)${clientName}_${amountFormatter.format(total)}円_${hash}.pdf";

    final directory = await getExternalStorageDirectory();
    if (directory == null) return;

    final file = File("${directory.path}/$fileName");
    await file.writeAsBytes(bytes);

    setState(() {
      _lastFilePath = file.path;
      _status = "【原本保存完了】\n$fileName";
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text("じぇみエモン V1.4.3c"), backgroundColor: Colors.blueGrey),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: SingleChildScrollView(
          child: Column(children: [
            Row(children: [
              Expanded(
                child: TextField(
                  controller: _clientController,
                  decoration: const InputDecoration(labelText: "取引先名", border: OutlineInputBorder())
                )
              ),
              const SizedBox(width: 8),
              IconButton(
                icon: const Icon(Icons.person_search, color: Colors.blue, size: 40),
                onPressed: _pickContact,
              ),
            ]),
            const SizedBox(height: 16),
            TextField(
              controller: _amountController,
              keyboardType: TextInputType.number,
              decoration: const InputDecoration(labelText: "単価 (税抜)", border: OutlineInputBorder())
            ),
            const SizedBox(height: 24),

            ElevatedButton.icon(
              onPressed: _generateInvoice,
              icon: const Icon(Icons.save),
              label: const Text("原本PDFをローカル保存"),
              style: ElevatedButton.styleFrom(
                minimumSize: const Size(double.infinity, 60),
                backgroundColor: Colors.indigo,
                foregroundColor: Colors.white
              ),
            ),

            const SizedBox(height: 20),
            Row(children: [
              Expanded(
                child: ElevatedButton.icon(
                  onPressed: _lastFilePath == null ? null : _methodDirectOpen,
                  icon: const Icon(Icons.launch),
                  label: const Text("内容確認(A)"),
                  style: ElevatedButton.styleFrom(
                    minimumSize: const Size(0, 50),
                    backgroundColor: Colors.orange,
                    foregroundColor: Colors.white
                  ),
                ),
              ),
              const SizedBox(width: 8),
              Expanded(
                child: ElevatedButton.icon(
                  onPressed: _lastFilePath == null ? null : _methodShare,
                  icon: const Icon(Icons.share),
                  label: const Text("外部共有(B)"),
                  style: ElevatedButton.styleFrom(
                    minimumSize: const Size(0, 50),
                    backgroundColor: Colors.green,
                    foregroundColor: Colors.white
                  ),
                ),
              ),
            ]),

            const SizedBox(height: 24),
            Container(
              width: double.infinity,
              padding: const EdgeInsets.all(12),
              color: Colors.grey[100],
              child: Text(_status, style: const TextStyle(fontSize: 12, color: Colors.black54)),
            ),
          ]),
        ),
      ),
    );
  }
}