Continentis/Assets/Scripts/MainGame/Commands/Cmd_DiscardCards.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Continentis.MainGame.Card;
using Continentis.MainGame.Character;
using DG.Tweening;
using SLSFramework.General;
using UniRx;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Continentis.MainGame.Commands
{
    public class Cmd_DiscardCards : CommandBase
    {
        private readonly DeckSubmodule deck;
        private readonly List<CardInstance> cardsToDiscard;
        private readonly float interval;
        private readonly float singleCardAnimationDuration = 0.5f; // 单张卡牌的动画时长

        private readonly bool isInitiative;
        
        public Cmd_DiscardCards(DeckSubmodule deck, List<CardInstance> cards, bool isInitiative, float interval)
        {
            this.deck = deck;
            this.cardsToDiscard = cards;
            this.isInitiative = isInitiative;
            this.interval = interval;
        }
        
        protected override IObservable<Unit> OnExecute(CommandContext outerContext)
        {
            if (cardsToDiscard == null || cardsToDiscard.Count == 0)
            {
                return Observable.Return(Unit.Default);
            }

            // --- 情况1：并行丢弃 (所有卡牌动画同时开始) ---
            if (interval <= 0f)
            {
                // 为每张卡牌创建一个“懒加载”的丢弃动画流。
                var allDiscardAnimations = cardsToDiscard.Select(card => 
                    Observable.Defer(() => DiscardCard(card))
                );
            
                // 使用 WhenAll 等待所有的并行任务都完成。
                // 只有当最后一个动画结束时，WhenAll 才会发出完成信号。
                return Observable.WhenAll(allDiscardAnimations).AsUnitObservable();
            }
        
            // --- 情况2：交错丢弃 (按固定间隔开始动画) ---
            else
            {
                var cardStream = cardsToDiscard.ToObservable();
                var timerStream = Observable.Timer(TimeSpan.Zero, TimeSpan.FromSeconds(interval));

                return timerStream
                    .Zip(cardStream, (_, card) => card)
                    // 核心：不再使用 .Do(..).Subscribe()，而是使用 Select 将每个 card 转换为
                    // 其对应的动画流。这样主流程就“知道”了每个动画的存在。
                    .Select(card => DiscardCard(card))
                    // 使用 Merge 将所有交错开始的动画流合并为一个流。
                    // Merge 会同时运行所有这些动画，并在最后一个动画也完成时，它才会完成。
                    .Merge()
                    // 使用 Last 来确保我们只在整个 Merge 流全部结束后，才发出最终的完成信号。
                    .Last()
                    .AsUnitObservable();
            }
        }

        private IObservable<Unit> DiscardCard(CardInstance card)
        {
            if (isInitiative)
            {
                if (card.cardLogic.eventSubmodule.onInitiativeDiscard.GetChecks().Any()) // 如果主动弃牌后，有触发条件，则打断弃牌，直接触发效果
                {
                    CommandQueueManager.Instance.AddCommand(new Cmd_Function(() =>
                    {
                        card.cardLogic.eventSubmodule.onInitiativeDiscard.GetEffects().ForEach(effect => effect.Invoke());
                    }));
                    return Observable.Return(Unit.Default);
                }
            }
            
            deck.TransferCard(deck.Pile(card.cardLocation.pileName), deck.DiscardPile, card);
            card.handCardView.TransferCardView(CombatUIManager.Instance.combatMainPage.discardPile);
            
            RectTransform cardTransform = card.handCardView.cardTransform;
            Vector3 deltaMove = Vector3.zero - card.handCardView.cardTransform.localPosition;
            Vector3 randomLift = new Vector3(Random.Range(-200f, 200f), Random.Range(200f, 600f), 0);
            
            cardTransform.DOBlendableLocalMoveBy(deltaMove, singleCardAnimationDuration).Play();
            cardTransform.DOBlendableLocalMoveBy(randomLift, singleCardAnimationDuration * 0.5f).SetLoops(2, LoopType.Yoyo).Play();
            cardTransform.DOLocalRotate(new Vector3(0, 0, 720f), singleCardAnimationDuration, RotateMode.FastBeyond360).Play();
            cardTransform.DOScale(Vector3.zero, singleCardAnimationDuration).SetEase(Ease.Linear).Play();

            return Observable.Timer(TimeSpan.FromSeconds(singleCardAnimationDuration)).AsUnitObservable();
        }

    }
}