using System;
using System.Collections.Generic;
using System.Linq;
using Continentis.MainGame.Card;
using Continentis.MainGame.Character;
using Cysharp.Threading.Tasks;
using DG.Tweening;
using SLSUtilities.General;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Continentis.MainGame.Commands
{
    public class Cmd_DrawCards : CommandBase
    {
        private readonly DeckSubmodule deck;
        private readonly int drawCount;
        private readonly float interval;
        private readonly List<CardInstance> customDrawCards;
        private readonly bool isCustomDraw;

        private const float SingleCardAnimationDuration = 0.4f;

        public Cmd_DrawCards(DeckSubmodule deck, int drawCount, float interval = 0.1f)
        {
            this.deck = deck;
            this.drawCount = drawCount;
            this.interval = interval;
            isCustomDraw = false;
            customDrawCards = null;
        }

        public Cmd_DrawCards(DeckSubmodule deck, List<CardInstance> customDrawCards, float interval = 0.1f)
        {
            this.deck = deck;
            this.drawCount = customDrawCards.Count;
            this.interval = interval;
            this.customDrawCards = customDrawCards;
            isCustomDraw = true;
        }

        protected override async UniTask ExecuteAsync(CommandContext outerContext)
        {
            if (!isCustomDraw)
            {
                int finalDrawCount = Mathf.Min(drawCount, deck.DrawPile.Count);

                if (finalDrawCount <= 0)
                {
                    Debug.Log("[Cmd_DrawCards] 无牌可抽。");
                    outerContext.Set(CommandContextKeys.DrawnCards, new List<CardLogicBase>());
                    return;
                }

                // 快照：在动画开始前记录将要抽的牌（顺序与 DrawPile 一致）
                var drawnCards = deck.DrawPile.Take(finalDrawCount).ToList();
                outerContext.Set(CommandContextKeys.DrawnCards, drawnCards);
                Debug.Log($"[Cmd_DrawCards] 抽取 {finalDrawCount} 张牌。");

                await DrawStaggeredAsync(finalDrawCount, drawnCards.Count);
            }
            else
            {
                outerContext.Set(CommandContextKeys.DrawnCards, customDrawCards);
                Debug.Log($"[Cmd_DrawCards] 抽取 {customDrawCards.Count} 张指定牌。");

                await DrawCustomStaggeredAsync(customDrawCards);
            }
        }

        // 标准抽牌：每次从 DrawPile[0] 取牌，交错并行动画
        private async UniTask DrawStaggeredAsync(int count, int totalCount)
        {
            var tasks = new UniTask[count];
            for (int i = 0; i < count; i++)
                tasks[i] = DrawOneWithDelay(i, totalCount, i * interval);
            await UniTask.WhenAll(tasks);
        }

        private async UniTask DrawOneWithDelay(int index, int totalCount, float delay)
        {
            if (delay > 0f)
                await UniTask.Delay(TimeSpan.FromSeconds(delay));

            var card = deck.DrawPile[0];
            deck.TransferCard(deck.DrawPile, deck.HandPile, card);
            card.eventSubmodule.onDraw.Invoke();
            card.handCardView.TransferCardView(CombatUIManager.Instance.combatMainPage.handPile);

            PlayDrawAnimation(card, index, totalCount);
            await UniTask.Delay(TimeSpan.FromSeconds(SingleCardAnimationDuration));
        }

        // 指定牌抽牌：交错并行动画
        private async UniTask DrawCustomStaggeredAsync(List<CardInstance> cards)
        {
            var tasks = new UniTask[cards.Count];
            for (int i = 0; i < cards.Count; i++)
            {
                CardInstance captured = cards[i];
                int idx = i;
                tasks[i] = DrawCustomOneWithDelay(captured, idx, cards.Count, idx * interval);
            }
            await UniTask.WhenAll(tasks);
        }

        private async UniTask DrawCustomOneWithDelay(CardInstance card, int index, int totalCount, float delay)
        {
            if (delay > 0f)
                await UniTask.Delay(TimeSpan.FromSeconds(delay));

            deck.TransferCard(card.cardLocation.pileName, "Hand", card);
            card.eventSubmodule.onDraw.Invoke();
            card.handCardView.TransferCardView(CombatUIManager.Instance.combatMainPage.handPile);

            PlayDrawAnimation(card, index, totalCount);
            await UniTask.Delay(TimeSpan.FromSeconds(SingleCardAnimationDuration));
        }

        private void PlayDrawAnimation(CardInstance card, int index, int totalCount)
        {
            var handPile = CombatUIManager.Instance.combatMainPage.handPile;
            var targetPosition = handPile.GetCardPosition(index, totalCount);
            var targetRotation = handPile.GetCardRotation(index, totalCount);
            var deltaMove = targetPosition - card.handCardView.cardTransform.localPosition;
            var randomLift = new Vector3(Random.Range(-200f, 200f), Random.Range(200f, 600f), 0f);

            card.handCardView.cardTransform.DOBlendableLocalMoveBy(deltaMove, SingleCardAnimationDuration).Play();
            card.handCardView.cardTransform.DOBlendableLocalMoveBy(randomLift, SingleCardAnimationDuration * 0.5f)
                .SetLoops(2, LoopType.Yoyo).Play();
            card.handCardView.cardTransform.DOLocalRotateQuaternion(targetRotation, SingleCardAnimationDuration).Play();
            card.handCardView.cardTransform.DOScale(Vector3.one, SingleCardAnimationDuration).Play();
        }
    }
}