using System.Linq;
using UnityEngine;

namespace AZTECHWB.Extensions
{
    public static class TransformExtension
    {
        public static T GetOrAddComponent<T>(this Transform root) where T : Component
        {
            if (root.TryGetComponent<T>(out var result))
            {
                return result;
            }
            return root.gameObject.AddComponent<T>();
        }
        public static T Find<T>(this Transform root, string name) where T : UnityEngine.Component
        {
            for (int i = 0; i < root.childCount; ++i)
            {
                var child = root.GetChild(i);
                if (child.TryGetComponent<T>(out var result))
                {
                    if (child.name == name)
                    {
                        return result;
                    }
                }
                result = child.Find<T>(name);
                if (result != null)
                {
                    return result;
                }
            }
            return null;
        }
        public static T GetComponentInChildren<T>(this Transform root, string name) where T : Component
        {
            for (int i = 0; i < root.childCount; ++i)
            {
                var c = root.GetChild(i);
                if (c.TryGetComponent<T>(out var result))
                {
                    if (c.gameObject.name == name)
                        return result;
                }

                result = c.GetComponentInChildren<T>(name);
                if (result != null)
                {
                    return result;
                }
            }
            return null;
        }

        public static bool TryGetComponentInChildren<T>(this Transform root, string name, out T result) where T : Component
        {

            if (root.TryGetComponent<T>(out result))
            {
                if (result.name.Equals(name))
                {
                    return true;
                }
            }
            for (int i = 0; i < root.childCount; ++i)
            {
                var children = root.GetChild(i);
                if (children.TryGetComponent<T>(out result))
                {
                    if (result.name.Equals(name))
                        return true;
                }

                if (children.TryGetComponentInChildren<T>(name, out result))
                {
                    if (result.name.Equals(name))
                    {
                        return true;
                    }
                }
            }
            return false;
        }
        public static bool TryGetComponentsInChildren<T>(this Transform root, out T[] result) where T : Component
        {
            result = root.GetComponentsInChildren<T>();
            if (result != null && result.Length != 0)
            {
                return true;
            }
            return false;
        }

        public static bool TryGetComponentInChildren<T>(this Transform root, out T result) where T : Component
        {
            if (root.TryGetComponent<T>(out result))
            {
                return true;
            }
            for (int i = 0; i < root.childCount; ++i)
            {
                var children = root.GetChild(i);

                if (children.TryGetComponent<T>(out result))
                {
                    return true;
                }
                if (children.TryGetComponentInChildren<T>(out result))
                {
                    return true;
                }
            }
            return false;
        }

        public static bool TryGetComponentInParent<T>(this Transform root, out T result)
        {
            var curr = root.parent;

            while (curr != null)
            {
                if (curr.TryGetComponent<T>(out result))
                {
                    return true;
                }
                curr = curr.parent;
            }
            result = default(T);
            return false;
        }

        public static bool Contains<T>(this Transform root, T target) where T : Component
        {
            var comps = root.GetComponentsInChildren<T>();
            if (comps.Contains(target))
            {
                return true;
            }
            return false;
        }
        public static Vector3 GetMeshCenter(this Transform root)
        {
            {
                Renderer[] renderers = root.GetComponentsInChildren<Renderer>(true);

                if (renderers == null || renderers.Length == 0)
                {
                    return Vector3.zero;
                }

                // 첫 번째 Renderer의 bounds로 초기 바운딩 박스를 설정
                Bounds combinedBounds = renderers[0].bounds;

                // 나머지 Renderer들의 bounds를 combinedBounds에 포함시킴
                for (int i = 1; i < renderers.Length; i++)
                {
                    combinedBounds.Encapsulate(renderers[i].bounds);
                }

                // 결합된 바운딩 박스의 중심점을 반환
                return combinedBounds.center;
            }
        }
    }
}