import 'dart:async';
import 'dart:collection';

import 'package:flutter/cupertino.dart';

import 'package:yumi/ui_kit/widgets/room/anim/l_gift_animal_view.dart';

class GiftAnimationManager extends ChangeNotifier {
  static const int _maxPendingAnimations = 24;
  static const Duration _activeComboIdleDismissDelay = Duration(
    milliseconds: 3200,
  );

  Queue<LGiftModel> pendingAnimationsQueue = Queue<LGiftModel>();
  List<LGiftScrollingScreenAnimsBean> animationControllerList = [];

  //每个控件正在播放的动画
  Map<int, LGiftModel?> giftMap = {0: null, 1: null, 2: null, 3: null};

  bool get _controllersReady =>
      animationControllerList.length >= giftMap.length;

  GiftAnimationSlotSnapshot? slotSnapshotAt(int index) {
    final gift = giftMap[index];
    if (gift == null || animationControllerList.length <= index) {
      return null;
    }
    final bean = animationControllerList[index];
    return GiftAnimationSlotSnapshot(
      index: index,
      bean: bean,
      sendUserName: gift.sendUserName,
      sendToUserName: gift.sendToUserName,
      sendUserPic: gift.sendUserPic,
      giftPic: gift.giftPic,
      giftName: gift.giftName,
      giftCount: gift.giftCount,
      rewardAmountText: gift.rewardAmountText,
      rewardAmount: gift.rewardAmount,
      showLuckyRewardFrame: gift.showLuckyRewardFrame,
      labelId: gift.labelId,
      giftCountStepUnit: gift.giftCountStepUnit,
    );
  }

  void enqueueGiftAnimation(LGiftModel giftModel) {
    if (_mergeIntoActiveAnimation(giftModel)) {
      return;
    }
    if (_mergeIntoPendingAnimation(giftModel)) {
      return;
    }
    _trimPendingAnimations();
    pendingAnimationsQueue.add(giftModel);
    proceedToNextAnimation();
  }

  void _trimPendingAnimations() {
    while (pendingAnimationsQueue.length >= _maxPendingAnimations) {
      pendingAnimationsQueue.removeFirst();
    }
  }

  bool _mergeIntoActiveAnimation(LGiftModel incoming) {
    for (final entry in giftMap.entries) {
      final current = entry.value;
      if (current == null || current.labelId != incoming.labelId) {
        continue;
      }
      _mergeGiftModel(target: current, incoming: incoming);
      notifyListeners();
      _refreshSlotAnimation(entry.key, restartEntry: false);
      return true;
    }
    return false;
  }

  bool _mergeIntoPendingAnimation(LGiftModel incoming) {
    for (final pending in pendingAnimationsQueue) {
      if (pending.labelId != incoming.labelId) {
        continue;
      }
      _mergeGiftModel(target: pending, incoming: incoming);
      return true;
    }
    return false;
  }

  void _mergeGiftModel({
    required LGiftModel target,
    required LGiftModel incoming,
  }) {
    target.giftCount = (target.giftCount) + (incoming.giftCount);
    if (target.sendUserName.isEmpty) {
      target.sendUserName = incoming.sendUserName;
    }
    if (target.sendToUserName.isEmpty) {
      target.sendToUserName = incoming.sendToUserName;
    }
    if (target.sendUserPic.isEmpty) {
      target.sendUserPic = incoming.sendUserPic;
    }
    if (target.giftPic.isEmpty) {
      target.giftPic = incoming.giftPic;
    }
    if (target.giftName.isEmpty) {
      target.giftName = incoming.giftName;
    }
    target.rewardAmount = target.rewardAmount + incoming.rewardAmount;
    if (incoming.rewardAmountText.isNotEmpty) {
      target.rewardAmountText = incoming.rewardAmountText;
    }
    target.showLuckyRewardFrame =
        target.showLuckyRewardFrame || incoming.showLuckyRewardFrame;
    if (incoming.giftCountStepUnit > 0) {
      target.giftCountStepUnit = incoming.giftCountStepUnit;
    }
  }

  ///开始播放
  proceedToNextAnimation() {
    if (pendingAnimationsQueue.isEmpty || !_controllersReady) {
      return;
    }
    var playGift = pendingAnimationsQueue.first;
    for (var key in giftMap.keys) {
      var value = giftMap[key];
      if (value == null) {
        giftMap[key] = playGift;
        pendingAnimationsQueue.removeFirst();
        notifyListeners();
        _refreshSlotAnimation(key, restartEntry: true);
        break;
      } else {
        if (value.labelId == playGift.labelId) {
          _mergeGiftModel(target: value, incoming: playGift);
          pendingAnimationsQueue.removeFirst();
          notifyListeners();
          _refreshSlotAnimation(key, restartEntry: false);
          break;
        }
      }
    }
  }

  void attachAnimationControllers(List<LGiftScrollingScreenAnimsBean> anins) {
    animationControllerList = anins;
    proceedToNextAnimation();
  }

  void cleanupAnimationResources() {
    pendingAnimationsQueue.clear();
    giftMap[0] = null;
    giftMap[1] = null;
    giftMap[2] = null;
    giftMap[3] = null;
    for (var element in animationControllerList) {
      element.dismissTimer?.cancel();
      element.controller.dispose();
      element.countPulseController.dispose();
    }
    animationControllerList.clear();
  }

  void markAnimationAsFinished(int index) {
    _cancelSlotDismissTimer(index);
    if (giftMap[index] == null) {
      return;
    }
    giftMap[index] = null;
    notifyListeners();
    proceedToNextAnimation();
  }

  void _refreshSlotAnimation(int index, {required bool restartEntry}) {
    if (animationControllerList.length <= index) {
      return;
    }
    final bean = animationControllerList[index];
    _restartSlotDismissTimer(index);
    bean.countPulseController.forward(from: 0);
    if (restartEntry) {
      bean.controller.forward(from: 0);
    }
  }

  void _restartSlotDismissTimer(int index) {
    if (animationControllerList.length <= index) {
      return;
    }
    final bean = animationControllerList[index];
    bean.dismissTimer?.cancel();
    bean.dismissTimer = Timer(_activeComboIdleDismissDelay, () {
      if (giftMap[index] == null) {
        return;
      }
      markAnimationAsFinished(index);
    });
  }

  void _cancelSlotDismissTimer(int index) {
    if (animationControllerList.length <= index) {
      return;
    }
    animationControllerList[index].dismissTimer?.cancel();
    animationControllerList[index].dismissTimer = null;
  }
}

@immutable
class GiftAnimationSlotSnapshot {
  const GiftAnimationSlotSnapshot({
    required this.index,
    required this.bean,
    required this.sendUserName,
    required this.sendToUserName,
    required this.sendUserPic,
    required this.giftPic,
    required this.giftName,
    required this.giftCount,
    required this.rewardAmountText,
    required this.rewardAmount,
    required this.showLuckyRewardFrame,
    required this.labelId,
    required this.giftCountStepUnit,
  });

  final int index;
  final LGiftScrollingScreenAnimsBean bean;
  final String sendUserName;
  final String sendToUserName;
  final String sendUserPic;
  final String giftPic;
  final String giftName;
  final num giftCount;
  final String rewardAmountText;
  final num rewardAmount;
  final bool showLuckyRewardFrame;
  final String labelId;
  final num giftCountStepUnit;

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) {
      return true;
    }
    return other is GiftAnimationSlotSnapshot &&
        other.index == index &&
        identical(other.bean, bean) &&
        other.sendUserName == sendUserName &&
        other.sendToUserName == sendToUserName &&
        other.sendUserPic == sendUserPic &&
        other.giftPic == giftPic &&
        other.giftName == giftName &&
        other.giftCount == giftCount &&
        other.rewardAmountText == rewardAmountText &&
        other.rewardAmount == rewardAmount &&
        other.showLuckyRewardFrame == showLuckyRewardFrame &&
        other.labelId == labelId &&
        other.giftCountStepUnit == giftCountStepUnit;
  }

  @override
  int get hashCode => Object.hash(
    index,
    bean,
    sendUserName,
    sendToUserName,
    sendUserPic,
    giftPic,
    giftName,
    giftCount,
    rewardAmountText,
    rewardAmount,
    showLuckyRewardFrame,
    labelId,
    giftCountStepUnit,
  );
}