import 'package:flutter/material.dart';
import 'package:sensors_plus/sensors_plus.dart';
import 'package:vibration/vibration.dart';
import 'dart:async';
import './record_page.dart';

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  StreamSubscription? _accelerometerSubscription;
  DateTime? _lastShakeTime;
  int _shakeCount = 0;
  bool _isNavigating = false;

  @override
  void initState() {
    super.initState();
    _initShakeDetection();
  }

  /// 初始化摇晃检测
  void _initShakeDetection() {
    _accelerometerSubscription = accelerometerEvents.listen((event) {
      // 主要检测左右摇晃（x轴）
      if (event.x.abs() > 25) {
        final now = DateTime.now();
        if (_lastShakeTime == null) {
          _lastShakeTime = now;
          _shakeCount = 1;
        } else {
          // 缩短有效时间窗口，要求更快的摇晃
          if (now.difference(_lastShakeTime!) < const Duration(milliseconds: 500)) {
            _shakeCount++;
            if (_shakeCount >= 2) {
              _navigateToRecordPageWithVibration();
              _shakeCount = 0;
              _lastShakeTime = null;
            }
          } else {
            // 重置计数
            _shakeCount = 1;
          }
          _lastShakeTime = now;
        }
      }
    });
  }

  /// 通过摇晃触发的导航（带震动）
  void _navigateToRecordPageWithVibration() async {
    if (_isNavigating) return;
    
    _isNavigating = true;
    // 添加震动反馈
    if (await Vibration.hasVibrator() ?? false) {
      Vibration.vibrate(duration: 200);
    }
    
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => const RecordPage(),
        maintainState: false,
      ),
    ).then((_) {
      _isNavigating = false;
    });
  }

  /// 通过按钮触发的导航（无震动）
  void _navigateToRecordPage() {
    if (_isNavigating) return;
    
    _isNavigating = true;
    Navigator.push(
      context,
      MaterialPageRoute(
        builder: (context) => const RecordPage(),
        maintainState: false,
      ),
    ).then((_) {
      _isNavigating = false;
    });
  }

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('记账本'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            ElevatedButton(
              onPressed: _navigateToRecordPage,
              child: const Text('记账'),
            ),
          ],
        ),
      ),
    );
  }
}