namespace XCEngine
{
    public sealed class GameObject : Object
    {
        private readonly ulong m_uuid;

        internal GameObject(ulong uuid)
        {
            m_uuid = uuid;
        }

        public ulong UUID => m_uuid;

        public static GameObject Find(string name)
        {
            ulong uuid = InternalCalls.GameObject_Find(name ?? string.Empty);
            return uuid != 0 ? new GameObject(uuid) : null;
        }

        public static GameObject Create(string name)
        {
            return Create(name, null);
        }

        public static GameObject Create(string name, GameObject parent)
        {
            ulong uuid = InternalCalls.GameObject_Create(name ?? string.Empty, parent?.UUID ?? 0);
            return uuid != 0 ? new GameObject(uuid) : null;
        }

        public string Name
        {
            get => InternalCalls.GameObject_GetName(UUID) ?? string.Empty;
            set => InternalCalls.GameObject_SetName(UUID, value ?? string.Empty);
        }

        public string name
        {
            get => Name;
            set => Name = value;
        }

        public bool activeSelf => InternalCalls.GameObject_GetActiveSelf(UUID);

        public bool activeInHierarchy => InternalCalls.GameObject_GetActiveInHierarchy(UUID);

        public void SetActive(bool value)
        {
            InternalCalls.GameObject_SetActive(UUID, value);
        }

        public void Destroy()
        {
            InternalCalls.GameObject_Destroy(UUID);
        }

        public Transform Transform => GetComponent<Transform>();
        public Transform transform => Transform;

        public bool HasComponent<T>() where T : Component
        {
            return InternalCalls.GameObject_HasComponent(UUID, typeof(T));
        }

        public T GetComponent<T>() where T : Component
        {
            return InternalCalls.GameObject_GetComponent(UUID, typeof(T)) as T;
        }

        public T[] GetComponents<T>() where T : Component
        {
            Component[] components = InternalCalls.GameObject_GetComponents(UUID, typeof(T));
            if (components == null || components.Length == 0)
            {
                return System.Array.Empty<T>();
            }

            if (components is T[] typedComponents)
            {
                return typedComponents;
            }

            T[] result = new T[components.Length];
            for (int index = 0; index < components.Length; ++index)
            {
                result[index] = components[index] as T;
            }

            return result;
        }

        public T GetComponentInChildren<T>() where T : Component
        {
            return InternalCalls.GameObject_GetComponentInChildren(UUID, typeof(T)) as T;
        }

        public T GetComponentInParent<T>() where T : Component
        {
            return InternalCalls.GameObject_GetComponentInParent(UUID, typeof(T)) as T;
        }

        public T AddComponent<T>() where T : Component
        {
            return InternalCalls.GameObject_AddComponent(UUID, typeof(T)) as T;
        }

        public bool TryGetComponent<T>(out T component) where T : Component
        {
            component = GetComponent<T>();
            return component != null;
        }
    }
}