nomo/lib/app/modules/home/widgets/connection_button.dart

import 'package:flutter/material.dart' hide ConnectionState;
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'dart:math' as math;
import 'dart:async';
import 'package:get/get.dart';
import 'package:nomo/app/widgets/ix_image.dart';

import '../../../constants/assets.dart';
import '../../../../config/theme/theme_extensions/theme_extension.dart';
import '../../../../config/translations/strings_enum.dart';
import '../../../constants/enums.dart';

class ConnectionButton extends StatefulWidget {
  final ConnectionState state;
  final VoidCallback? onTap;

  const ConnectionButton({super.key, required this.state, this.onTap});

  @override
  State<ConnectionButton> createState() => _ConnectionButtonState();
}

class _ConnectionButtonState extends State<ConnectionButton>
    with TickerProviderStateMixin {
  bool _isAtTop = false; // 控制按钮位置，false=底部，true=顶部
  List<Color>? _previousGradientColor; // 保存前一个渐变色用于动画过渡
  late AnimationController _rotationController; // 旋转动画控制器
  Timer? _connectingTimer; // 连接中状态的计时器
  int _connectingTextIndex = 0; // 当前显示的连接文本索引（0-4）
  ConnectionState? _previousState; // 保存前一个连接状态

  @override
  void initState() {
    super.initState();
    // 初始化旋转动画控制器
    _rotationController = AnimationController(
      duration: const Duration(seconds: 2),
      vsync: this,
    );
  }

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

  void _onTap() {
    if (widget.onTap != null) {
      widget.onTap!();
    }
  }

  // 启动连接中状态的文本轮播计时器
  void _startConnectingTimer() {
    _connectingTimer?.cancel();
    _connectingTextIndex = 0;
    _connectingTimer = Timer.periodic(const Duration(seconds: 1), (timer) {
      if (mounted) {
        setState(() {
          // 每秒切换到下一个文本，循环显示0-4
          _connectingTextIndex = (_connectingTextIndex + 1) % 5;
        });
      }
    });
  }

  // 停止连接中状态的文本轮播计时器
  void _stopConnectingTimer() {
    _connectingTimer?.cancel();
    _connectingTimer = null;
    _connectingTextIndex = 0;
  }

  // 根据索引获取对应的连接文本
  String _getConnectingText() {
    switch (_connectingTextIndex) {
      case 0:
        return Strings.securingData.tr;
      case 1:
        return Strings.encryptingTraffic.tr;
      case 2:
        return Strings.protectingPrivacy.tr;
      case 3:
        return Strings.safeConnection.tr;
      case 4:
        return Strings.yourDataIsSafe.tr;
      default:
        return Strings.connecting.tr;
    }
  }

  // 比较两个颜色列表是否相等
  bool _colorsEqual(List<Color> a, List<Color> b) {
    if (a.length != b.length) return false;
    for (int i = 0; i < a.length; i++) {
      if (a[i].value != b[i].value) return false;
    }
    return true;
  }

  Widget _buildImageWithAnimation(String imgPath) {
    // 如果是 connectingVirtual/connecting 或 disconnecting 状态，添加旋转动画
    if (widget.state == ConnectionState.connectingVirtual ||
        widget.state == ConnectionState.connecting ||
        widget.state == ConnectionState.disconnecting) {
      // 启动旋转动画
      if (!_rotationController.isAnimating) {
        _rotationController.repeat();
      }

      return AnimatedBuilder(
        animation: _rotationController,
        builder: (context, child) {
          return Transform.rotate(
            angle: _rotationController.value * 2 * math.pi,
            child: IXImage(
              source: imgPath,
              sourceType: ImageSourceType.asset,
              width: 30.w,
              height: 30.w,
            ),
          );
        },
      );
    } else {
      // 其他状态停止旋转动画
      if (_rotationController.isAnimating) {
        _rotationController.stop();
      }

      return IXImage(
        source: imgPath,
        sourceType: ImageSourceType.asset,
        width: 30.w,
        height: 30.w,
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return GestureDetector(onTap: _onTap, child: _buildMainButton());
  }

  Widget _buildMainButton() {
    // 根据状态和主题获取颜色
    List<Color> gradientColor;
    String imgPath;
    String statusImgPath;
    String text;
    Color textColor;

    switch (widget.state) {
      case ConnectionState.disconnected:
        gradientColor = [
          Get.reactiveTheme.highlightColor,
          Get.reactiveTheme.hintColor,
        ];
        imgPath = Assets.switchStatusDisconnected;
        statusImgPath = Assets.disconnected;
        text = Strings.disconnected.tr;
        textColor = Get.reactiveTheme.hintColor;
        // 只在状态改变时执行一次
        if (_previousState != ConnectionState.disconnected && _isAtTop) {
          WidgetsBinding.instance.addPostFrameCallback((_) {
            if (mounted) {
              setState(() {
                _isAtTop = false;
              });
            }
          });
        }
        _stopConnectingTimer(); // 停止计时器
        break;
      case ConnectionState.connectingVirtual:
      case ConnectionState.connecting:
        gradientColor = [
          Get.reactiveTheme.highlightColor,
          Get.reactiveTheme.hintColor,
        ];
        imgPath = Assets.switchStatusConnecting;
        statusImgPath = Assets.connecting;
        text = _getConnectingText(); // 使用轮播文本
        textColor = Get.reactiveTheme.hintColor;
        // 只在状态改变时执行一次切换位置
        if (_previousState != ConnectionState.connectingVirtual &&
            _previousState != ConnectionState.connecting) {
          WidgetsBinding.instance.addPostFrameCallback((_) {
            if (mounted) {
              setState(() {
                _isAtTop = !_isAtTop;
              });
            }
          });
        }
        // 启动连接文本轮播计时器
        if (_connectingTimer == null || !_connectingTimer!.isActive) {
          _startConnectingTimer();
        }
        break;
      case ConnectionState.disconnecting:
        gradientColor = [
          Get.reactiveTheme.highlightColor,
          Get.reactiveTheme.hintColor,
        ];
        imgPath = Assets.switchStatusConnecting;
        statusImgPath = Assets.connecting;
        text = Strings.disconnecting.tr;
        textColor = Get.reactiveTheme.hintColor;
        _stopConnectingTimer(); // 停止计时器
        break;
      case ConnectionState.connected:
        gradientColor = [
          Get.reactiveTheme.shadowColor,
          Get.reactiveTheme.primaryColor,
        ];
        imgPath = Assets.switchStatusConnected;
        statusImgPath = Assets.connected;
        text = Strings.connected.tr;
        textColor = Get.reactiveTheme.textTheme.bodyLarge!.color!;
        // 只在状态改变时执行一次
        if (_previousState != ConnectionState.connected && !_isAtTop) {
          WidgetsBinding.instance.addPostFrameCallback((_) {
            if (mounted) {
              setState(() {
                _isAtTop = true;
              });
            }
          });
        }
        _stopConnectingTimer(); // 停止计时器
        break;
      case ConnectionState.error:
        gradientColor = [
          Get.reactiveTheme.highlightColor,
          Get.reactiveTheme.hintColor,
        ];
        imgPath = Assets.switchStatusDisconnected;
        statusImgPath = Assets.error;
        text = Strings.error.tr;
        textColor = Get.reactiveTheme.hintColor;
        _stopConnectingTimer(); // 停止计时器
        break;
    }

    // 保存前一个渐变色用于动画
    final previousColor = _previousGradientColor ?? gradientColor;

    // 只在颜色真正改变时更新
    if (_previousGradientColor == null ||
        _previousGradientColor!.length != gradientColor.length ||
        !_colorsEqual(_previousGradientColor!, gradientColor)) {
      // 延迟更新，避免在 build 中调用 setState
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (mounted) {
          _previousGradientColor = gradientColor;
        }
      });
    }

    // 更新前一个状态
    if (_previousState != widget.state) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        if (mounted) {
          _previousState = widget.state;
        }
      });
    }

    return Column(
      children: [
        TweenAnimationBuilder<List<Color>>(
          duration: const Duration(milliseconds: 300),
          curve: Curves.easeInOut,
          tween: ColorListTween(begin: previousColor, end: gradientColor),
          builder: (context, colors, child) {
            return Container(
              width: 72.w,
              height: 132.w,
              padding: EdgeInsets.all(6.w),
              decoration: BoxDecoration(
                borderRadius: BorderRadius.circular(20.r),
                gradient: LinearGradient(
                  begin: Alignment.topCenter,
                  end: Alignment.bottomCenter,
                  colors: colors,
                ),
              ),
              child: child,
            );
          },
          child: AnimatedAlign(
            duration: const Duration(milliseconds: 300),
            curve: Curves.fastOutSlowIn,
            alignment: _isAtTop ? Alignment.topCenter : Alignment.bottomCenter,
            child: Container(
              width: 60.w,
              height: 60.w,
              alignment: Alignment.center,
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(14.r),
              ),
              child: AnimatedSwitcher(
                duration: const Duration(milliseconds: 300),
                transitionBuilder: (Widget child, Animation<double> animation) {
                  return FadeTransition(
                    opacity: animation,
                    child: ScaleTransition(
                      scale: Tween<double>(
                        begin: 0.85,
                        end: 1.0,
                      ).animate(animation),
                      child: child,
                    ),
                  );
                },
                child: _buildImageWithAnimation(imgPath),
              ),
            ),
          ),
        ),
        20.verticalSpaceFromWidth,
        AnimatedSwitcher(
          duration: const Duration(milliseconds: 400),
          switchInCurve: Curves.easeIn,
          switchOutCurve: Curves.easeOut,
          transitionBuilder: (Widget child, Animation<double> animation) {
            return FadeTransition(opacity: animation, child: child);
          },
          child: Row(
            key: ValueKey(text), // 使用文本作为 key，确保文字改变时触发动画
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              IXImage(
                source: statusImgPath,
                sourceType: ImageSourceType.asset,
                width: 14.w,
                height: 14.w,
              ),
              4.horizontalSpace,
              Text(
                text,
                style: TextStyle(
                  fontSize: 14.sp,
                  fontWeight: FontWeight.w500,
                  height: 1.4,
                  color: textColor,
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

// 自定义颜色列表插值器，用于渐变色动画
class ColorListTween extends Tween<List<Color>> {
  ColorListTween({super.begin, super.end});

  @override
  List<Color> lerp(double t) {
    if (begin == null || end == null) {
      return end ?? begin ?? [];
    }

    final length = math.max(begin!.length, end!.length);
    return List.generate(length, (index) {
      final beginColor = index < begin!.length ? begin![index] : begin!.last;
      final endColor = index < end!.length ? end![index] : end!.last;
      return Color.lerp(beginColor, endColor, t) ?? endColor;
    });
  }
}