import 'dart:async';

import 'package:flutter/material.dart';

import 'agent.dart';
import 'server/protocol.dart';

/// 饭卡打印助手主窗口（Phase 1 最小版：服务状态 + 打印机状态 + 运行日志；
/// 托盘/首次引导/驱动安装在后续 Phase 增强）。
Future<void> main(List<String> args) async {
  WidgetsFlutterBinding.ensureInitialized();
  final agent = Agent(AgentOptions.parse(args));
  String? startError;
  try {
    await agent.start();
  } catch (e) {
    startError = '$e';
  }
  runApp(DesktopPluginApp(agent: agent, startError: startError));
}

class DesktopPluginApp extends StatelessWidget {
  const DesktopPluginApp({super.key, required this.agent, this.startError});

  final Agent agent;
  final String? startError;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: '饭卡打印助手',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: const Color(0xFF0F6FDE)),
        useMaterial3: true,
      ),
      home: AgentHomePage(agent: agent, startError: startError),
    );
  }
}

class AgentHomePage extends StatefulWidget {
  const AgentHomePage({super.key, required this.agent, this.startError});

  final Agent agent;
  final String? startError;

  @override
  State<AgentHomePage> createState() => _AgentHomePageState();
}

class _AgentHomePageState extends State<AgentHomePage> {
  PrinterStatus? _status;
  Object? _statusError;
  bool _loading = false;
  StreamSubscription<String>? _logSub;
  final _logs = <String>[];

  @override
  void initState() {
    super.initState();
    _logSub = widget.agent.log.stream.listen((line) {
      if (mounted) setState(() => _logs.add(line));
    });
    _logs.addAll(widget.agent.log.lines);
    _refreshStatus();
  }

  @override
  void dispose() {
    _logSub?.cancel();
    super.dispose();
  }

  Future<void> _refreshStatus() async {
    setState(() => _loading = true);
    try {
      final status = await widget.agent.backend.getStatus();
      if (!mounted) return;
      setState(() {
        _status = status;
        _statusError = null;
      });
    } catch (e) {
      if (!mounted) return;
      setState(() => _statusError = '$e');
    } finally {
      if (mounted) setState(() => _loading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    final port = widget.agent.port;
    return Scaffold(
      appBar: AppBar(
        title: const Text('饭卡打印助手'),
        actions: [
          IconButton(icon: const Icon(Icons.refresh), tooltip: '刷新状态', onPressed: _refreshStatus),
          const SizedBox(width: 8),
        ],
      ),
      body: ListView(
        padding: const EdgeInsets.all(16),
        children: [
          _serviceCard(port),
          const SizedBox(height: 12),
          _printerCard(),
          const SizedBox(height: 12),
          _logCard(),
        ],
      ),
    );
  }

  Widget _serviceCard(int? port) {
    final err = widget.startError;
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                Icon(
                  err == null && port != null ? Icons.check_circle : Icons.error,
                  color: err == null && port != null ? Colors.green : Colors.red,
                ),
                const SizedBox(width: 8),
                Text('本机服务', style: Theme.of(context).textTheme.titleMedium),
              ],
            ),
            const SizedBox(height: 8),
            Text(err ?? (port != null ? 'http://127.0.0.1:$port  （管理端开卡页自动发现）' : '未启动')),
            const SizedBox(height: 4),
            Text('后端：${widget.agent.options.mock ? "mock（模拟）" : "系统打印队列"}'),
          ],
        ),
      ),
    );
  }

  Widget _printerCard() {
    final status = _status;
    final err = _statusError;
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Row(
              children: [
                if (_loading)
                  const SizedBox(width: 18, height: 18, child: CircularProgressIndicator(strokeWidth: 2))
                else
                  Icon(
                    status != null && status.online ? Icons.print : Icons.print_disabled,
                    color: status != null && status.online ? Colors.green : Colors.orange,
                  ),
                const SizedBox(width: 8),
                Text('打印机', style: Theme.of(context).textTheme.titleMedium),
              ],
            ),
            const SizedBox(height: 8),
            if (err != null)
              Text('状态读取失败：$err', style: const TextStyle(color: Colors.red))
            else if (status != null) ...[
              Text('${status.model.isEmpty ? "未知型号" : status.model} · ${status.statusText}'),
              const SizedBox(height: 4),
              Text(
                '色带余量 ${status.ribbon.remain >= 0 ? "${status.ribbon.remain}%" : "未知"}'
                ' · 剩卡 ${status.cardLeft >= 0 ? "${status.cardLeft} 张" : "未知"}',
                style: TextStyle(color: Theme.of(context).hintColor),
              ),
            ],
          ],
        ),
      ),
    );
  }

  Widget _logCard() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(14),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text('运行日志', style: Theme.of(context).textTheme.titleMedium),
            const SizedBox(height: 8),
            if (_logs.isEmpty)
              Text('（暂无）', style: TextStyle(color: Theme.of(context).hintColor))
            else
              ...(_logs.length > 50 ? _logs.sublist(_logs.length - 50) : _logs)
                  .map((line) => Text(line, style: const TextStyle(fontFamily: 'monospace', fontSize: 12))),
          ],
        ),
      ),
    );
  }
}