import 'package:get/get.dart';
import 'dart:async';
import 'dart:io';
import 'package:flutter/material.dart';

enum ConnectStatus {
  initial,    // 初始状态，显示添加设备
  searching,  // 搜索中
  connected,  // 连接成功
  failed      // 连接失败
}

class HomeController extends GetxController {
  static HomeController get to => Get.find();
  
  final _connectStatus = ConnectStatus.initial.obs;
  final _searchDots = ''.obs;
  Timer? _animationTimer;
  bool _isDisposed = false;
  
  ConnectStatus get connectStatus => _connectStatus.value;
  String get searchDots => _searchDots.value;

  @override
  void onInit() {
    super.onInit();
    _connectStatus.value = ConnectStatus.initial;
  }

  @override
  void onClose() {
    _isDisposed = true;
    stopSearchingAnimation();
    super.onClose();
  }

  void startSearchingAnimation() {
    stopSearchingAnimation(); // Clear any existing timer
    
    if (_isDisposed) return;
    
    int count = 0;
    _animationTimer = Timer.periodic(const Duration(milliseconds: 500), (timer) {
      if (_isDisposed || _connectStatus.value != ConnectStatus.searching) {
        timer.cancel();
        return;
      }
      count = (count + 1) % 4;
      _searchDots.value = '.' * count;
    });
  }

  void stopSearchingAnimation() {
    _animationTimer?.cancel();
    _animationTimer = null;
    if (!_isDisposed) {
      _searchDots.value = '';
    }
  }

  Future<void> connectDevice() async {
    if (_connectStatus.value == ConnectStatus.searching) return;
    
    _connectStatus.value = ConnectStatus.searching;
    startSearchingAnimation();

    try {
      // 模拟搜索和连接过程
      await Future.delayed(const Duration(seconds: 3));
      
      if (_isDisposed) return; // Check if controller is disposed
      
      // 模拟随机成功或失败
      if (DateTime.now().millisecondsSinceEpoch % 2 == 0) {
        _connectStatus.value = ConnectStatus.connected;
        if (!_isDisposed) {
          await Future.delayed(const Duration(seconds: 2)); // 显示成功状态2秒
          Get.snackbar(
            'Success', 
            'Device connected successfully',
            snackPosition: SnackPosition.TOP,
            backgroundColor: Colors.green.withOpacity(0.1),
            colorText: Colors.green,
            duration: const Duration(seconds: 3),
          );
        }
      } else {
        _connectStatus.value = ConnectStatus.failed;
      }
    } catch (e) {
      if (!_isDisposed) {
        _connectStatus.value = ConnectStatus.failed;
        Get.snackbar(
          'Error', 
          'Failed to connect to device',
          snackPosition: SnackPosition.TOP,
          backgroundColor: Colors.red.withOpacity(0.1),
          colorText: Colors.red,
          duration: const Duration(seconds: 3),
        );
      }
    } finally {
      if (!_isDisposed && _connectStatus.value == ConnectStatus.searching) {
        stopSearchingAnimation();
        _connectStatus.value = ConnectStatus.failed;
      }
    }
  }

  void retryConnect() {
    if (_isDisposed) return;
    _connectStatus.value = ConnectStatus.initial;
    connectDevice();
  }

  void disconnectDevice() {
    if (_isDisposed) return;
    _connectStatus.value = ConnectStatus.initial;
    Get.snackbar(
      'Disconnected', 
      'Device has been disconnected',
      snackPosition: SnackPosition.TOP,
      backgroundColor: Colors.blue.withOpacity(0.1),
      colorText: Colors.blue,
      duration: const Duration(seconds: 3),
    );
  }
}