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

namespace BF
{
    public class Atlas : ScriptableObject, ISerializationCallbackReceiver
    {
        [SerializeField]
        List<Sprite> spriteList = new List<Sprite>();

        [SerializeField]
        [HideInInspector]
        List<uint> spriteNameList = new List<uint>();
        Dictionary<uint, Sprite> spriteDict = new Dictionary<uint, Sprite>();

#if UNITY_EDITOR
        public bool AddSprite(Sprite sprite)
        {
            if (sprite == null)
            {
                return false;
            }
            spriteList.Add(sprite);
            spriteNameList.Add(Utils.BKDRHash(sprite.name));
            return true;
        }

        public void RemoveSprite(Sprite sprite)
        {
            if (sprite == null)
            {
                return;
            }
            spriteList.Remove(sprite);
            spriteNameList.Remove(Utils.BKDRHash(sprite.name));
        }

        public void RemoveNullSprite()
        {
            EnsureWithoutNull();
        }

        public bool Contains(Sprite sprite)
        {
            return spriteList.Contains(sprite);
        }

        public void Clear()
        {
            spriteList.Clear();
            spriteNameList.Clear();
        }

        public int GetCount()
        {
            return spriteList.Count;
        }

        void EnsureWithoutNull()
        {
            int count = spriteList.Count;
            for (int i = count - 1; i >= 0; i--)
            {
                if (spriteList[i] == null)
                {
                    spriteList.RemoveAt(i);
                    spriteNameList.RemoveAt(i);
                }
            }
        }
#endif
        public bool GetIsHashCollision()
        {
            return spriteNameList.Count != spriteDict.Count;
        }

        public Sprite GetSprite(uint spriteName)
        {
            Sprite result;
            spriteDict.TryGetValue(spriteName, out result);
            return result;
        }

        public void OnBeforeSerialize() { }

        public void OnAfterDeserialize()
        {
            spriteDict.Clear();
            int count = spriteNameList.Count;
            for (int i = 0; i < count; i++)
            {
                spriteDict.TryAdd(spriteNameList[i], spriteList[i]);
            }
#if !UNITY_EDITOR
            spriteNameList.Clear();
            spriteList.Clear();
#endif
        }
    }
}