import 'dart:async';
import 'package:flutter/foundation.dart';

enum LimitMode {
  debounce, //防抖
  throttle, //节流
}

class ActionLimiter {
  final int milliseconds;
  final LimitMode mode;

  Timer? _debounceTimer;
  DateTime? _lastActionTime;

  ActionLimiter({
    this.milliseconds = 300,
    this.mode = LimitMode.debounce,
  });

  void run(VoidCallback action) {
    if (mode == LimitMode.debounce) {
      // 防抖：只执行最后一次
      _debounceTimer?.cancel();
      _debounceTimer = Timer(Duration(milliseconds: milliseconds), action);
    } else if (mode == LimitMode.throttle) {
      // 节流：间隔内只执行一次
      final now = DateTime.now();
      if (_lastActionTime == null ||
          now.difference(_lastActionTime!) >
              Duration(milliseconds: milliseconds)) {
        _lastActionTime = now;
        action();
      }
    }
  }

  void dispose() {
    _debounceTimer?.cancel();
  }
}