using UnityEditor;
using UnityEngine;

/// <summary>
/// An Editor Script to sort all direct children of a selected GameObject.
/// </summary>
public class SortChildren : ScriptableObject
{
    [MenuItem("Utilities/Sort Children")]
    static void Execute()
    {
        var selected = Selection.transforms;
        if (selected.Length == 0)
        {
            Debug.LogError("No GameObjects were selected!");
            return;
        }
        if (selected.Length > 1)
        {
            Debug.LogError("Only one GameObject at a time can be sorted!");
            return;
        }

        var obj = selected[0];
        var children = obj.childCount;
        do
        {
            var n = 1;
            for (int i = 0; i < children - 1; i++)
            {
                var child1 = obj.GetChild(i);
                var child2 = obj.GetChild(i + 1);
                if (child1.name.CompareTo(child2.name) > 0)
                {
                    child1.SetSiblingIndex(i + 1);
                    child2.SetSiblingIndex(i);
                    n = i + 1;
                }
            }
            children = n;
        } while (children > 1);
    }
}