using System;
using System.Collections.Generic;
using System.Linq;
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>
        /// Full list of sprites
        /// </summary>
        public List<SpriteRenderer> Sprites;

		/// <summary>
		/// SortingGroup can be used when you have multiple characters on scene.
		/// </summary>
		public SortingGroup SortingGroup;

		/// <summary>
        /// Step between two sprites (layers).
        /// </summary>
        public int SortingOrderStep = 5;

        public LayerManager CopyTo;

        /// <summary>
        /// Read ordered sprite list by Sorting Order.
        /// </summary>
        public void ReadSortingOrder()
        {
            Sprites = GetComponentsInChildren<SpriteRenderer>(true).OrderBy(i => i.sortingOrder).ToList();
        }

        /// <summary>
        /// Set layers order by Sorting Order.
        /// </summary>
        public void SetSortingOrder()
        {
            for (var i = 0; i < Sprites.Count; i++)
            {
                Sprites[i].sortingOrder = SortingOrderStep * i;
            }

            #if UNITY_EDITOR
            UnityEditor.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;
        }
    }
}