using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Splines;

public class TurnHandlerDealCard : MonoBehaviour
{
    // ======== serializeField ========
    public List<GameObject> cardPrefabs;
    public SplineContainer splineContainer;
    public RectTransform dealCardPlace;
    public Camera mainCamera;
    public Transform cardContainer;

    // ======== private ========
    private readonly List<Card> handCardList = new();
    private Vector3 deal_card_point_world_position;
    private CombatScenarioEventOS combatScenarioEventOS;

    private void Awake()
    {
        combatScenarioEventOS = CombatScenarioEventOS.Instance;
        REGISTER_EVENT_deal_card();
    }


    private void Start()
    {
        if (mainCamera == null) mainCamera = Camera.main;
        RectTransformUtility.ScreenPointToWorldPointInRectangle(
            rect: dealCardPlace,
            screenPoint: dealCardPlace.position,
            cam: mainCamera,
            out deal_card_point_world_position);
    }

    private void REGISTER_EVENT_deal_card() // 系统开始乙方回合
    {
        // TODO: 增加洗牌消息监听
        combatScenarioEventOS.EVENT_REGISTER<EventStruct.STRUCT_EVENT_DEAL_CARD>(
            EventData.EVENT_REGISTER_CARD_ENUM.EVENT_LET_OS_DEAL_CARD, callback);
        return;

        void callback(EventStruct.STRUCT_EVENT_DEAL_CARD args)
        {
            int handCardCount = args.HAND_CARD_COUNT;
            int deckCardCount = args.DECK_CARD_COUNT;
            float duration = args.DURATION;
            combatScenarioEventOS.LOCK_APPLY(EventLock.LOCK_EXCLUSIVE_CARD_ENUM.LOCK_OS_SHUFFLE_CARD); // 系统发牌加锁
            StartCoroutine(coroutine());
            return;

            IEnumerator coroutine()
            {
                for (var i = 0; i < handCardCount; i++)
                {
                    create_a_card(duration);
                    yield return new WaitForSeconds(duration);
                }

                combatScenarioEventOS.LOCK_RELEASE(EventLock.LOCK_EXCLUSIVE_CARD_ENUM.LOCK_OS_SHUFFLE_CARD); // 系统发牌解锁
            }
        }
    }


    private void create_a_card(float duration) // 创建卡牌实例
    {
        GameObject _card = Instantiate<GameObject>(
            cardPrefabs[UnityEngine.Random.Range(0, cardPrefabs.Count)],
            position: deal_card_point_world_position,
            rotation: Quaternion.identity,
            parent: cardContainer);
        _card.gameObject.name = $"Card_{handCardList.Count}";
        Card cardComponent = _card.GetComponent<Card>();
        cardComponent.SetID(handCardList.Count);
        handCardList.Add(cardComponent);
        readjust_card_card_position(duration);
    }

    private void readjust_card_card_position(float duration) // 调整卡牌位置
    {
        int handCardListCount = handCardList.Count;
        if (handCardListCount == 0) return;
        float cardSpacing = handCardListCount switch // 动态调整卡牌间距
        {
            <= 4 => 0.5f / (handCardListCount + 1),
            <= 5 => 0.75f / (handCardListCount + 1),
            _ => 1f / (handCardListCount + 1)
        };

        float firstCardPosition = 0.5f - (handCardListCount - 1) * cardSpacing / 2; // 获取第一个卡牌的位置
        Spline spline = splineContainer.Spline; // 获取曲线
        draw_card();
        return;

        void draw_card()
        {
            for (int i = 0; i < handCardListCount; i++)
            {
                float position = firstCardPosition + i * cardSpacing;
                Vector3 card_world_position = spline.EvaluatePosition(position); // 获取曲线指定位置的坐标
                card_world_position += cardContainer.position;
                Vector3 forward = spline.EvaluateTangent(position); // 获取曲线指定的切线方向
                Vector3 up = spline.EvaluateUpVector(position); // 获取曲线指定的UP向量
                Vector3 upwards = Vector3.Cross(up, forward).normalized; // 切线和向上的夹角计算方向
                Quaternion rotation = Quaternion.LookRotation(up, upwards);
                combatScenarioEventOS.EVENT_TRIGGER(EventData.EVENT_REGISTER_CARD_ENUM.EVENT_LET_CARD_DRAW_CARD,
                    new EventStruct.STRUCT_EVENT_DRAW_CARD
                    {
                        ID = i,
                        POSITION = card_world_position,
                        ROTATION = rotation,
                        DURATION = duration,
                        LAYER_SORT_ORDER = i + 1,
                        SCALE = Vector3.one,
                    });
            }
        }
    }
}