using UnityEngine;
using System.Collections.Generic;


namespace TMPro
{

    public class TMP_SpriteAsset : TMP_Asset
    {
        private Dictionary<int, int> m_UnicodeLookup;
        private Dictionary<int, int> m_NameLookup;

        /// <summary>
        /// Static reference to the default font asset included with TextMesh Pro.
        /// </summary>
        public static TMP_SpriteAsset defaultSpriteAsset
        {
            get
            {
                if (m_defaultSpriteAsset == null)
                {
                    m_defaultSpriteAsset = Resources.Load<TMP_SpriteAsset>("Sprite Assets/Default Sprite Asset");
                }

                return m_defaultSpriteAsset;
            }
        }
        public static TMP_SpriteAsset m_defaultSpriteAsset;
        
        
        // The texture which contains the sprites.
        public Texture spriteSheet;

        // List which contains the SpriteInfo for the sprites contained in the sprite sheet.
        public List<TMP_Sprite> spriteInfoList;

        /// <summary>
        /// Dictionary used to lookup the index of a given sprite based on a Unicode value.
        /// </summary>
        //private Dictionary<int, int> m_SpriteUnicodeLookup;


        /// <summary>
        /// List which contains the Fallback font assets for this font.
        /// </summary>
        [SerializeField]
        public List<TMP_SpriteAsset> fallbackSpriteAssets;


        //private bool isEditingAsset;

        void OnEnable()
        {
            // Make sure we have a valid material.
            //if (this.material == null && !isEditingAsset)
            //   this.material = GetDefaultSpriteMaterial();
        }


#if UNITY_EDITOR
        /// <summary>
        /// 
        /// </summary>
        void OnValidate()
        {

            TMPro_EventManager.ON_SPRITE_ASSET_PROPERTY_CHANGED(true, this);
        }
#endif


        /// <summary>
        /// Create a material for the sprite asset.
        /// </summary>
        /// <returns></returns>
        Material GetDefaultSpriteMaterial()
        {
            //isEditingAsset = true;
            ShaderUtilities.GetShaderPropertyIDs();

            // Add a new material
            Shader shader = Shader.Find("TextMeshPro/Sprite");
            Material tempMaterial = new Material(shader);
            tempMaterial.SetTexture(ShaderUtilities.ID_MainTex, spriteSheet);
            tempMaterial.hideFlags = HideFlags.HideInHierarchy;

#if UNITY_EDITOR
            UnityEditor.AssetDatabase.AddObjectToAsset(tempMaterial, this);
            UnityEditor.AssetDatabase.ImportAsset(UnityEditor.AssetDatabase.GetAssetPath(this));
#endif
            //isEditingAsset = false;

            return tempMaterial;
        }


        /// <summary>
        /// Function to update the sprite name and unicode lookup tables.
        /// </summary>
        public void UpdateLookupTables()
        {
            if (m_NameLookup == null) m_NameLookup = new Dictionary<int, int>();

            if (m_UnicodeLookup == null) m_UnicodeLookup = new Dictionary<int, int>();

            for (int i = 0; i < spriteInfoList.Count; i++)
            {
                int nameHashCode = spriteInfoList[i].hashCode;

                if (m_NameLookup.ContainsKey(nameHashCode) == false)
                    m_NameLookup.Add(nameHashCode, i);

                int unicode = spriteInfoList[i].unicode;

                if (m_UnicodeLookup.ContainsKey(unicode) == false)
                    m_UnicodeLookup.Add(unicode, i);
            }
        }


        /// <summary>
        /// Function which returns the sprite index using the hashcode of the name
        /// </summary>
        /// <param name="hashCode"></param>
        /// <returns></returns>
        public int GetSpriteIndexFromHashcode(int hashCode)
        {
            if (m_NameLookup == null)
                UpdateLookupTables();

            int index = 0;
            if (m_NameLookup.TryGetValue(hashCode, out index))
                return index;

            return -1;
        }


        /// <summary>
        /// Returns the index of the sprite for the given unicode value.
        /// </summary>
        /// <param name="unicode"></param>
        /// <returns></returns>
        public int GetSpriteIndexFromUnicode (int unicode)
        {
            if (m_UnicodeLookup == null)
                UpdateLookupTables();

            int index = 0;

            if (m_UnicodeLookup.TryGetValue(unicode, out index))
                return index;

            return -1;
        }


        /// <summary>
        /// Returns the index of the sprite for the given name.
        /// </summary>
        /// <param name="name"></param>
        /// <returns></returns>
        public int GetSpriteIndexFromName (string name)
        {
            if (m_NameLookup == null)
                UpdateLookupTables();

            int hashCode = TMP_TextUtilities.GetSimpleHashCode(name);

            return GetSpriteIndexFromHashcode(hashCode);
        }


        /// <summary>
        /// Search through the given sprite asset and its fallbacks for the specified sprite matching the given unicode character.
        /// </summary>
        /// <param name="spriteAsset">The font asset to search for the given character.</param>
        /// <param name="unicode">The character to find.</param>
        /// <param name="glyph">out parameter containing the glyph for the specified character (if found).</param>
        /// <returns></returns>
        public static TMP_SpriteAsset SearchFallbackForSprite(TMP_SpriteAsset spriteAsset, int unicode, out int spriteIndex)
        {
            spriteIndex = -1;
            if (spriteAsset == null) return null;

            spriteIndex = spriteAsset.GetSpriteIndexFromUnicode(unicode);
            if (spriteIndex != -1)
                return spriteAsset;
            else if (spriteAsset.fallbackSpriteAssets != null && spriteAsset.fallbackSpriteAssets.Count > 0)
            {
                for (int i = 0; i < spriteAsset.fallbackSpriteAssets.Count && spriteIndex == -1; i++)
                {
                    TMP_SpriteAsset temp = SearchFallbackForSprite(spriteAsset.fallbackSpriteAssets[i], unicode, out spriteIndex);

                    if (temp != null)
                        return temp;
                }
            }
            return null;
        }


        /// <summary>
        /// Search through the given list of sprite assets and their possible fallbacks for the specified sprite matching the given unicode character.
        /// </summary>
        /// <param name="spriteAssets"></param>
        /// <param name="unicode"></param>
        /// <param name="spriteIndex"></param>
        /// <returns></returns>
        public static TMP_SpriteAsset SearchFallbackForSprite(List<TMP_SpriteAsset> spriteAssets, int unicode, out int spriteIndex)
        {
            spriteIndex = -1;

            if (spriteAssets != null && spriteAssets.Count > 0)
            {
                for (int i = 0; i < spriteAssets.Count; i++)
                {
                    TMP_SpriteAsset spriteAsset = SearchFallbackForSprite(spriteAssets[i], unicode, out spriteIndex);

                    if (spriteAsset != null)
                        return spriteAsset;
                }
            }

            return null;
        }

        /*
        #if UNITY_EDITOR
                /// <summary>
                /// 
                /// </summary>
                public void LoadSprites()
                {
                    if (m_sprites != null && m_sprites.Count > 0)
                        return;

                    Debug.Log("Loading Sprite List");

                    string filePath = UnityEditor.AssetDatabase.GetAssetPath(spriteSheet);

                    Object[] objects = UnityEditor.AssetDatabase.LoadAllAssetsAtPath(filePath);

                    m_sprites = new List<Sprite>();

                    foreach (Object obj in objects)
                    {
                        if (obj.GetType() == typeof(Sprite))
                        {
                            Sprite sprite = obj as Sprite;
                            Debug.Log("Sprite # " + m_sprites.Count + " Rect: " + sprite.rect);
                            m_sprites.Add(sprite);
                        }
                    }
                }


                /// <summary>
                /// 
                /// </summary>
                /// <returns></returns>
                public List<Sprite> GetSprites()
                {
                    if (m_sprites != null && m_sprites.Count > 0)
                        return m_sprites;

                    //Debug.Log("Loading Sprite List");

                    string filePath = UnityEditor.AssetDatabase.GetAssetPath(spriteSheet);

                    Object[] objects = UnityEditor.AssetDatabase.LoadAllAssetsAtPath(filePath);

                    m_sprites = new List<Sprite>();

                    foreach (Object obj in objects)
                    {
                        if (obj.GetType() == typeof(Sprite))
                        {
                            Sprite sprite = obj as Sprite;
                            //Debug.Log("Sprite # " + m_sprites.Count + " Rect: " + sprite.rect);
                            m_sprites.Add(sprite);
                        }
                    }

                    return m_sprites;
                }
        #endif
        */
    }
}