using System.Collections.Generic;
using Module.Log;
using UnityEngine;
public class UICameraMaskable : MonoBehaviour
{
    public static int clipAreaPropertyId;
    public UICameraMask mask { get; private set; }
    private List<Material> materialList;
    private bool started;
    
    private void OnEnable()
    {
        if (started)
        {
            mask = GetParentMask(transform);
            if (mask == null)
            {
                LogModule.WarningLog(string.Format("物体{0}上的UICameraMaskable无法找到Mask！", gameObject.name));
                UICameraMask.RemoveClipForOne(this);
            }
            else
            {
                mask.AddClippable(this);
            }
        }
    }
    private void OnDisable()
    {
        if (mask != null)
            mask.RemoveClippable(this);
    }
    private void OnDestroy()
    {
        for (int i = 0; i < materialList.Count; i++)
            Destroy(materialList[i]);
    }
    private void Start()
    {
        if (clipAreaPropertyId == 0)
            clipAreaPropertyId = Shader.PropertyToID("_ClipArea");
        materialList = new List<Material>();
        var renderers = GetComponentsInChildren<Renderer>();
        for (int i = 0; i < renderers.Length; i++)
            for (int j = 0; j < renderers[i].materials.Length; j++)
                materialList.Add(renderers[i].materials[j]);
        started = true;
        OnEnable();
    }
    private static UICameraMask GetParentMask(Transform child)
    {
        Transform parent = child.parent;
        if (parent == null)
            return null;
        else
        {
            var uiCameraMask = parent.GetComponent<UICameraMask>();
            if (uiCameraMask)
                return uiCameraMask;
            else
                return GetParentMask(parent);
        }
    }
    public void SetClipRect(Vector4 area)
    {
        for (int i = 0; i < materialList.Count; i++)
            materialList[i].SetVector(clipAreaPropertyId, area);
    }
}