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

public class BlockSlot : MonoBehaviour
{
    public BlockUnit MyUnit => mUnit;
    public bool HasUnit => mUnit != null;
    public int Index => mIndex;

    private Action<int> mDelPickUp;
    private Action<int> mDelMove;
    private Action<int> mDelDrowDown;

    [SerializeField] MeshRenderer mRdrFloor;

    private BoxCollider mCol;
    private BlockUnit mUnit;

    private int mIndex;
    
    private void Awake()
    {
        mUnit = GetComponentInChildren<BlockUnit>();
    }

    public void Init(int pIndex, Action<int> pDelPickUp = null, Action<int> pDelMove = null, Action<int> pDelDropDown = null)
    {
        if (mCol == null)
        {
            mCol = GetComponent<BoxCollider>();
        }

        mIndex = pIndex;

        SetDelegate(pDelPickUp, pDelMove, pDelDropDown);

        SetState(BlockState.Normal);
    }

    public void SetDelegate(Action<int> pDelPickUp = null, Action<int> pDelMove = null, Action<int> pDelDropDown = null)
    {
        mDelPickUp = pDelPickUp;
        mDelMove = pDelMove;
        mDelDrowDown = pDelDropDown;

        mCol.enabled = mDelPickUp != null;
    }

    public void ShowFloor(bool pShow)
    {
        mRdrFloor.enabled = pShow;
    }

    public void SetUnit(BlockUnit pUnit)
    {
        mUnit = pUnit;
        if (mUnit != null)
        {
            mUnit.SetGroupID(mIndex);
            mUnit.transform.SetParent(transform);
            Utils.NormalizeGameObject(mUnit.gameObject);
        }
    }

    public void SetState(BlockState pState)
    {
        mRdrFloor.gameObject.SetActive(pState != BlockState.Normal);
        Material tMat = ResourceManager.Instance.LoadRes<Material>(Const.Path.GetBlockMat(pState));
        mRdrFloor.material = tMat;
    }

    private void OnMouseDown()
    {
        mDelPickUp?.Invoke(mIndex);
    }

    private void OnMouseDrag()
    {
        mDelMove?.Invoke(mIndex);
    }

    private void OnMouseUp()
    {
        mDelDrowDown?.Invoke(mIndex);
    }
}

public enum BlockState
{
    Normal,
    Picked,
    Movable,
    Mergable,
    Forbidden
}