location2025/lib/module/member/member_discount_countdown_widget.dart

import 'package:flutter/material.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:location/resource/colors.gen.dart';
import 'package:location/utils/common_expand.dart';
import 'dart:async';

import '../../utils/mmkv_util.dart';

final String MemberDiscountCountdownTimeCount = 'key_member_discount_countdown_time_count';

class MemberDiscountCountdownWidget extends StatefulWidget {
  final Duration duration; // 倒计时总时长（默认1小时）
  final TextStyle? textStyle;
  final Duration animationDuration;
  final Widget? placeholder;
  final Widget? expiredWidget; // 已过期时显示的组件
  final VoidCallback? onExpired; // 倒计时结束回调

  const MemberDiscountCountdownWidget({
    Key? key,
    this.duration = const Duration(hours: 1),
    this.textStyle,
    this.animationDuration = const Duration(milliseconds: 500),
    this.placeholder,
    this.expiredWidget,
    this.onExpired,
  }) : super(key: key);

  @override
  _MemberDiscountCountdownWidgetState createState() => _MemberDiscountCountdownWidgetState();
}

class _MemberDiscountCountdownWidgetState extends State<MemberDiscountCountdownWidget> with SingleTickerProviderStateMixin {
  // 1. 将_timer改为可空类型，移除late
  Timer? _timer;
  bool _isVisible = true;
  bool _isExpired = false;
  DateTime? _startTime;
  Duration? _remainingDuration;
  bool _isLoading = true;

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

  Future<void> _loadStartTime() async {
    try {
      final savedTime = KVUtil.getInt(MemberDiscountCountdownTimeCount, 0);
      print("savetimefdifjd---${savedTime}");
      if (savedTime != null && savedTime > 0) {
        _startTime = DateTime.fromMillisecondsSinceEpoch(savedTime);
        _updateRemainingTime();

        if (_remainingDuration != null && _remainingDuration!.isNegative) {
          _handleExpired();
        } else {
          _startTimer();
        }
      } else {
        _startNewCountdown();
      }
    } catch (e) {
      print("加载倒计时时间出错: $e");
      // 异常时调用修复后的_handleExpiredOver
      _handleExpiredOver();
    } finally {
      if (mounted) {
        setState(() {
          _isLoading = false;
        });
      }
    }
  }

  void _startNewCountdown() {
    _startTime = DateTime.now();
    _saveStartTime();
    _updateRemainingTime();
    _startTimer();
  }

  Future<void> _saveStartTime() async {
    try {
      KVUtil.putInt(MemberDiscountCountdownTimeCount, _startTime!.millisecondsSinceEpoch);
    } catch (e) {
      print("保存倒计时时间出错: $e");
    }
  }

  void _startTimer() {
    // 2. 先取消可能存在的旧定时器（避免重复创建）
    _timer?.cancel();
    // 3. 重新创建定时器并赋值
    _timer = Timer.periodic(Duration(seconds: 1), (timer) {
      if (mounted) {
        setState(() {
          _updateRemainingTime();
          if (_remainingDuration != null && _remainingDuration!.isNegative) {
            _handleExpired();
          }
        });
      }
    });
  }

  void _updateRemainingTime() {
    if (_startTime == null) return;
    final now = DateTime.now();
    final endTime = _startTime!.add(widget.duration);
    _remainingDuration = endTime.difference(now);
  }

  void _handleExpired() {
    // 4. 安全取消定时器（允许_timer为null）
    _timer?.cancel();
    _isExpired = true;
    if (mounted) {
      widget.onExpired?.call();
    }
  }

  void _handleExpiredOver() {
    // 5. 修复这里！使用?避免对null调用cancel()
    _timer?.cancel();
    _isExpired = true;
    widget.onExpired?.call();
  }

  @override
  void dispose() {
    // 6. 销毁时安全取消
    _timer?.cancel();
    super.dispose();
  }

  // 以下代码不变...
  String _formatDuration(Duration duration) {
    final hours = duration.inHours;
    final minutes = duration.inMinutes.remainder(60);
    final seconds = duration.inSeconds.remainder(60);
    return '${hours.toString().padLeft(2, '0')} : '
        '${minutes.toString().padLeft(2, '0')} : '
        '${seconds.toString().padLeft(2, '0')}';
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const CircularProgressIndicator();
    }
    if (_isExpired) {
      return widget.expiredWidget ?? const SizedBox.shrink();
    }
    if (!_isVisible) {
      return widget.placeholder ?? const SizedBox.shrink();
    }
    if (_remainingDuration == null || _remainingDuration!.isNegative) {
      return _createCellWidget("00","00","00");
    }
    final hours = _remainingDuration!.inHours;
    final minutes = _remainingDuration!.inMinutes.remainder(60);
    final seconds = _remainingDuration!.inSeconds.remainder(60);
    final hoursStr = hours.toString().padLeft(2, '0');
    final minutesStr = minutes.toString().padLeft(2, '0');
    final secondsStr = seconds.toString().padLeft(2, '0');
    return _createCellWidget(hoursStr, minutesStr, secondsStr);
  }

  Widget _createCellWidget(String hoursStr, String minutesStr, String secondsStr) {
    return Container(
      child: Row(
        children: [
          Text(
            "优惠限时",
            style: TextStyle(
                color: "#333333".color,
                fontSize: 11.sp,
                fontWeight: FontWeight.w700),
          ),
          SizedBox(width: 5.w),
          _createItemWidget(hoursStr),
          _createItemMidele(),
          _createItemWidget(minutesStr),
          _createItemMidele(),
          _createItemWidget(secondsStr),
        ],
      ),
    );
  }

  Widget _createItemWidget(String timeStr) {
    return Container(
      height: 15.w, // 确保容器有足够高度
      alignment: Alignment.center,
      decoration: BoxDecoration(
        borderRadius: BorderRadius.circular(3),
        color: "#8B79F3".color,
      ),
      padding: EdgeInsets.symmetric(horizontal: 2.w),
      child: Text(
        timeStr,
        style: TextStyle(
          fontSize: 11.sp,
          color: ColorName.white,
          fontWeight: FontWeight.w500,
        ),
      ),
    );
  }

  Widget _createItemMidele() {
    return Container(
      alignment: Alignment.center,
      width: 4.w,
      child: Center(
        child: Text(
            ":",
            style: TextStyle(
                fontSize: 11.sp,
                color: "#8B79F3".color,
                fontWeight: FontWeight.w400)),
      ),
    );
  }
}