using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;


public class CardDrag : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
{
    public int playerID;
    public BattleCardState state = BattleCardState.inHand;
    private Vector3 offset;
    private bool isDragging = false;
    public GameObject SummonBlock;
    public GameObject[] playerBlocks;

    // Start is called before the first frame update
    void Start()
    {

    }

    // Update is called once per frame
    void Update()
    {
        // 右键点击取消操作
        if (isDragging && Input.GetMouseButtonDown(1))
        {
            CancelDrag();
        }
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        // 计算鼠标与卡牌的偏移量
        offset = transform.position - Camera.main.ScreenToWorldPoint(Input.mousePosition);
        isDragging = true;
        if (BattleManager.Instance.gamePhase == GamePhase.playerAction)
        //if(BattleManager.Instance.gamePhase.ToString() == "playerAction")
        {
            //在手牌时发起召唤请求
            if (GetComponent<CardDisplay>().card is MonsterCard)
            {
                if (state == BattleCardState.inHand)
                {
                    BattleManager.Instance.SummonRequst(playerID, gameObject);
                    //Debug.Log("Summon Requst has loaded");
                }
            }
            //在场上点击时发起攻击请求'

        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        isDragging = false;
        GameObject closestSlot = GetClosestSlot();
        if (closestSlot != null && SummonBlock.activeInHierarchy)
        {
            BattleManager.Instance.SummonConfirm(closestSlot.transform);
        }

        // 这里可以重置卡牌的位置
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (isDragging)
        {
            Vector3 mousePosition = Camera.main.ScreenToWorldPoint(Input.mousePosition);
            transform.position = new Vector3(mousePosition.x + offset.x, mousePosition.y + offset.y, transform.position.z);
        }
    }

    private GameObject GetClosestSlot()
    {
        GameObject[] blocks = playerBlocks;
        GameObject closest = null;
        float minDistance = Mathf.Infinity;

        foreach (var block in blocks)
        {
            float distance = Vector3.Distance(transform.position, block.transform.position);
            if (distance < minDistance)
            {
                minDistance = distance;
                closest = block;
            }
        }
        return closest;
    }

    private void SummonCard(GameObject slot)
    {
        Debug.Log($"召唤到 {slot.name}");
        // 在这里添加更多逻辑，例如将卡牌实例移动到槽内
    }

    private void CancelDrag()
    {
        isDragging = false;
        // 重置卡牌位置或执行其他取消逻辑
        Debug.Log("取消拖动操作");
    }

}