import 'package:flutter/material.dart';
import 'package:hgdj/assets_tool/images.dart';

/// 双击点赞爱心动效的触发器。onDoubleTapDown 里 [markAt] 记落点，onDoubleTap 里 [burst] 放动画
class LikeBurstController extends ChangeNotifier {
  Offset? at;

  /// 记下双击落点(相对 Stack 左上角)
  void markAt(Offset offset) => at = offset;

  /// 在落点弹一颗爱心；没记过落点就不弹
  void burst() {
    if (at == null) return;
    notifyListeners();
  }
}

/// 双击处弹出的爱心：弹起放大 → 停顿 → 淡出。必须直接挂在 Stack 里
class LikeBurstView extends StatefulWidget {
  const LikeBurstView({
    super.key,
    required this.controller,
    this.icon = 'like_red.png',
    this.size = 90,
  });

  final LikeBurstController controller;
  final String icon; // assets/images/common 下的图名
  final double size;

  @override
  State<LikeBurstView> createState() => _LikeBurstViewState();
}

class _LikeBurstViewState extends State<LikeBurstView>
    with SingleTickerProviderStateMixin {
  late final AnimationController _ctr;
  Offset? _at;

  @override
  void initState() {
    super.initState();
    _ctr = AnimationController(
        vsync: this, duration: const Duration(milliseconds: 600))
      ..addStatusListener((status) {
        if (status == AnimationStatus.completed && mounted)
          setState(() => _at = null);
      });
    widget.controller.addListener(_onBurst);
  }

  @override
  void didUpdateWidget(covariant LikeBurstView oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.controller != widget.controller) {
      oldWidget.controller.removeListener(_onBurst);
      widget.controller.addListener(_onBurst);
    }
  }

  @override
  void dispose() {
    widget.controller.removeListener(_onBurst);
    _ctr.dispose();
    super.dispose();
  }

  void _onBurst() {
    setState(() => _at = widget.controller.at);
    _ctr.forward(from: 0); // 连点就从头重放
  }

  @override
  Widget build(BuildContext context) {
    final at = _at;
    if (at == null) return const SizedBox.shrink();
    return Positioned(
      left: at.dx - widget.size / 2,
      top: at.dy - widget.size / 2,
      child: IgnorePointer(
        child: FadeTransition(
          opacity: TweenSequence<double>([
            TweenSequenceItem(tween: Tween(begin: 0.0, end: 1.0), weight: 20),
            TweenSequenceItem(tween: ConstantTween(1.0), weight: 40),
            TweenSequenceItem(tween: Tween(begin: 1.0, end: 0.0), weight: 40),
          ]).animate(_ctr),
          child: ScaleTransition(
            scale: Tween(begin: 0.5, end: 1.3).animate(
                CurvedAnimation(parent: _ctr, curve: Curves.easeOutBack)),
            child: Image.asset(widget.icon.commonImgPath,
                width: widget.size, height: widget.size),
          ),
        ),
      ),
    );
  }
}