using UnityEngine;

namespace gay.lilyy.Common
{
    public static class ComponentHelper
    {
        /// <summary>
        /// Searches for a component in children of the root GameObject.
        /// Returns null if no component is found.
        /// Logs an error and returns null if multiple components are found.
        /// </summary>
        /// <typeparam name="T">The component type to search for</typeparam>
        /// <param name="root">The root GameObject to search in</param>
        /// <returns>The component if exactly one is found, null otherwise</returns>
        public static T? GetComponentInChildrenWithError<T>(GameObject root) where T : Component
        {
            if (root == null) return null;

            T[] components = root.GetComponentsInChildren<T>(true);
            if (components.Length == 0)
            {
                return null;
            }
            if (components.Length > 1)
            {
                Debug.LogError($"Multiple {typeof(T).Name} components found in children of {root.name}. Only one is allowed.");
                return null;
            }
            return components[0];
        }

        /// <summary>
        /// Searches for a component in children of the root Transform.
        /// Returns null if no component is found.
        /// Logs an error and returns null if multiple components are found.
        /// </summary>
        /// <typeparam name="T">The component type to search for</typeparam>
        /// <param name="root">The root Transform to search in</param>
        /// <returns>The component if exactly one is found, null otherwise</returns>
        public static T? GetComponentInChildrenWithError<T>(Transform root) where T : Component
        {
            if (root == null) return null;

            T[] components = root.GetComponentsInChildren<T>(true);
            if (components.Length == 0)
            {
                return null;
            }
            if (components.Length > 1)
            {
                Debug.LogError($"Multiple {typeof(T).Name} components found in children of {root.name}. Only one is allowed.");
                return null;
            }
            return components[0];
        }
    }
}