using System.Collections.Generic;
using UnityEngine;

namespace TyphoonFontTool
{
    /// <summary>
    /// 字体码点值数据
    /// </summary>
    public class FontSourceData : ScriptableObject
    {
        //关联的字体文件
        public Font Font;

        //码点值
        public List<int> Codes = new List<int>();

        //字符字典
        private CharacterMap _map = null;

        //字符字典
        private CharacterMap Map
        {
            get
            {
                if (_map != null)
                {
                    var hashCode = Codes.GetHashCode();
                    if (_map.IsChanged(hashCode))
                    {
                        _map = null;
                    }
                }

                if (_map == null)
                {
                    _map = new CharacterMap(Codes);
                }

                return _map;
            }
        }

        private class CharacterMap
        {
            private int _hashCode;
            private HashSet<int> _codes;
            private HashSet<string> _characters;

            public CharacterMap(List<int> codes)
            {
                _hashCode = codes.GetHashCode();
                _codes = new HashSet<int>();
                _characters = new HashSet<string>();
                foreach (var code in codes)
                {
                    _codes.Add(code);
                }

                foreach (var code in codes)
                {
                    _characters.Add(char.ConvertFromUtf32(code));
                }
            }

            public bool IsChanged(int hashCode)
            {
                return hashCode != _hashCode;
            }

            public bool IsContain(string character)
            {
                return _characters.Contains(character);
            }

            public bool IsContain(int code)
            {
                return _codes.Contains(code);
            }
        }

        //判断是否存在字符
        public bool IsContains(string character)
        {
            return Map.IsContain(character);
        }

        //判断是否存在字符
        public bool IsContains(int code)
        {
            return Map.IsContain(code);
        }
    }
}