using UnityEngine;
using Object = UnityEngine.Object;

public class Util
{
    // recursive : 자식의 자식의 자식까지 재귀적으로 찾을지 여부
    public static T FindChild<T>(GameObject go, string name = null, bool recursive = false) where T : Object
    {
        if(go == null) return null;
        
        // 재귀적으로 찾을것인가?
        if (recursive)
        {
            foreach(T component in go.GetComponentsInChildren<T>())
            {
                if (string.IsNullOrEmpty(name) || component.name == name)
                    return component;
            }
        }
        // 재귀적으로 찾지 않을것인가?
        else
        {
            for (int i = 0; i < go.transform.childCount; i++)
            {
                Transform transform = go.transform.GetChild(i);
                if (string.IsNullOrEmpty(name) || transform.name == name)
                {
                    T component = transform.GetComponent<T>();
                    if (component != null) return component;
                }
            }
        }
        
        return null;
    }
    
    // GameObject를 찾는 용도
    public static GameObject FindChild(GameObject go, string name = null, bool recursive = false)
    {
        Transform transform = FindChild<Transform>(go, name, recursive);
        if (transform == null) return null;
        
        return transform.gameObject;
    }
    
    public static T GetOrAddComponent<T>(GameObject go) where T : Component
    {
        T component = go.GetComponent<T>();
        if (component == null) component = go.AddComponent<T>();
        return component;
    }
}