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

public class Drag : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IDragHandler
{
    private Vector2 distance;
    private bool isDragging = false;
    private bool cancelDrag = false;

    void Update()
    {

    }

    public void OnPointerDown(PointerEventData eventData)
    {
        if (BattleManager.Instance.gamePhase == GamePhase.playerAction)
        {
            isDragging = true;
        }
            if (!cancelDrag)
        {
            distance = new Vector2(transform.position.x, transform.position.y) - new Vector2(Input.mousePosition.x, Input.mousePosition.y);
        }
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        if (isDragging)
        {
            StopDragging();
            MatchToNearestBlock();//匹配最近格子并进行召唤
        }
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (isDragging)
        {
            transform.position = new Vector2(Input.mousePosition.x, Input.mousePosition.y) + distance;
        }
    }

    private void StopDragging()
    {
        isDragging = false;
        cancelDrag = true;
    }

    private void MatchToNearestBlock()
    {
        Block[] blocks = FindObjectsOfType<Block>(); // 获取所有的Block
        Block nearestBlock = null;
        float closestDistance = Mathf.Infinity;

        Vector2 currentPos = transform.position;

        // 遍历所有格子，找到距离最近的
        foreach (Block block in blocks)
        {
            float distance = Vector2.Distance(currentPos, block.transform.position);
            if (distance < closestDistance)
            {
                closestDistance = distance;
                nearestBlock = block;
            }
        }

        // 如果找到最近的格子，则召唤
        if (nearestBlock != null && nearestBlock.SummonBlock.activeInHierarchy)
        {
            BattleManager.Instance.SummonConfirm(nearestBlock.transform);
        }
    }
}