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

public class BatchGenerateBoxColliders : Editor
{
    [MenuItem("添加碰撞体/创建")]
    static void AddSingleBoxCollider()
    {
        for (int i = 0; i < Selection.gameObjects.Length; i++)
        {
            AddGameObjectCollider(Selection.gameObjects[i]);
        }
    }

    [MenuItem("添加碰撞体/递归创建")]
    static void AddMultipleBoxCollider()
    {
        for (int i = 0; i < Selection.gameObjects.Length; i++)
        {
            Queue<GameObject> collidersObjects = new Queue<GameObject>();

            collidersObjects.Enqueue(Selection.gameObjects[i].transform.GetChild(0).gameObject);

            while (collidersObjects.Count != 0)
            {
                GameObject parent = collidersObjects.Dequeue();

                AddGameObjectCollider(parent);

                for (int j = 0; j < parent.transform.childCount; j++)
                {
                    collidersObjects.Enqueue(parent.transform.GetChild(j).gameObject);
                }
            }
        }
    }

    /// <summary>
    /// 添加碰撞体
    /// </summary>
    /// <param name="gameObject"></param>  
    public static void AddGameObjectCollider(GameObject gameObject)
    {
        Vector3 pos = gameObject.transform.localPosition;
        Quaternion qt = gameObject.transform.localRotation;
        Vector3 ls = gameObject.transform.localScale;

        gameObject.transform.position = Vector3.zero;
        gameObject.transform.eulerAngles = Vector3.zero;
        gameObject.transform.localScale = Vector3.one;
        //获取物体的最小包围盒
        Bounds itemBound = GetLocalBounds(gameObject);

        gameObject.transform.localPosition = pos;
        gameObject.transform.localRotation = qt;
        gameObject.transform.localScale = ls;
        //parent = null;
        if (!gameObject.GetComponent<Collider>())
            gameObject.AddComponent<BoxCollider>();
        if (gameObject.GetComponent<BoxCollider>())
        {
            gameObject.GetComponent<BoxCollider>().size = itemBound.size;

            gameObject.GetComponent<BoxCollider>().center = itemBound.center;
        }
    }

    /// <summary>
    /// 获得对象的最小包围盒
    /// </summary>
    public static Bounds GetLocalBounds(GameObject target)
    {
        Renderer[] mfs = target.GetComponentsInChildren<Renderer>();
        Bounds bounds = new Bounds();
        if (mfs.Length != 0)
        {
            bounds = mfs[0].bounds;
            foreach (Renderer mf in mfs)
            {
                bounds.Encapsulate(mf.bounds);
            }
        }

        return bounds;
    }
}