using System;
using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;
using UnityEngine.Rendering;

namespace Assets.HeroEditor4D.Common.Scripts.CharacterScripts
{
    /// <summary>
    /// Used to order sprite layers (character parts).
    /// </summary>
    public class LayerManager : MonoBehaviour
    {
        /// <summary>
        /// SortingGroup can be used when you have multiple characters on scene.
        /// </summary>
        public SortingGroup SortingGroup;

        /// <summary>
        /// The full list of character sprites.
        /// </summary>
        public List<SpriteRenderer> Sprites;

        public LayerManager CopyTo;

        public void SetSortingGroupOrder(int index)
        {
            SortingGroup.sortingOrder = index;
        }

        /// <summary>
        /// Get character sprites and order by Sorting Order.
        /// </summary>
        public void GetSpritesBySortingOrder()
        {
            Sprites = GetComponentsInChildren<SpriteRenderer>(true).OrderBy(i => i.sortingOrder).ToList();
        }

        /// <summary>
        /// Set Sorting Order for character sprites.
        /// </summary>
        public void SetSpritesBySortingOrder()
        {
            for (var i = 0; i < Sprites.Count; i++)
            {
                Sprites[i].sortingOrder = 5 * i;
            }

            #if UNITY_EDITOR

            EditorUtility.SetDirty(this);

            #endif
        }

        public void CopyOrder()
        {
            if (CopyTo == null) throw new ArgumentNullException(nameof(CopyTo));

            foreach (var sprite in CopyTo.Sprites)
            {
                sprite.sortingOrder = Sprites.Single(i => i.name == sprite.name && GetSpriteRendererPath(i) == GetSpriteRendererPath(sprite)).sortingOrder;
            }

            Debug.Log("Copied!");
        }

        private static string GetSpriteRendererPath(SpriteRenderer spriteRenderer)
        {
            var path = spriteRenderer.name;
            var t = spriteRenderer.transform;

            while (t.parent != null && t.parent.GetComponent<Character4D>() == null)
            {
                path = t.parent.name + "/" + path;
                t = t.parent;
            }

            return path;
        }
    }
}