using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using UnityEngine;
using UnityObject = UnityEngine.Object;

namespace VketCloudGUITools.Utilities
{
    public static class TransformUtility
    {
        /// <summary>
        /// すべての子孫を取得
        /// </summary>
        /// <returns></returns>
        public static IEnumerable<Transform> GetAllDecendants(this Transform transform)
        {
            foreach (Transform child in transform)
            {
                yield return child;

                foreach (Transform decendant in child.GetAllDecendants())
                {
                    yield return decendant;
                }
            }
        }
    }

    public static class ComponentUtility
    {
        /// <summary>
        /// RequireComponent指定されたコンポーネントを取得する。
        /// <paramref name="requiredComponent"/>がnullならば検索され、そうでなければ継続使用される。
        /// </summary>
        /// <remarks>
        /// 対象コンポーネントが破損/階層移動することは考慮しない。
        /// </remarks>
        /// <typeparam name="TRecuireComponent"></typeparam>
        /// <param name="component"></param>
        /// <param name="requiredComponent">コンポーネント取得結果</param>
        /// <returns></returns>
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static TRecuireComponent GetRequiredComponent<TRecuireComponent>(this Component component, ref TRecuireComponent requiredComponent)
        {
            if (requiredComponent == null)
            {
                requiredComponent = component.GetComponent<TRecuireComponent>();
            }

            return requiredComponent;
        }

        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        public static TRecuireComponent GetRequiredComponentInParent<TRecuireComponent>(this Component component, ref TRecuireComponent requiredComponent)
        {
            if (requiredComponent == null)
            {
                requiredComponent = component.GetComponentInParent<TRecuireComponent>();
            }

            return requiredComponent;
        }
    }
}