using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FATrace.App.UniCodeToZPL
{
    /// <summary>
    /// 编码压缩处理
    /// </summary>
    internal class ZebraCompress
    {
        /// <summary>
        /// 编码处理压缩算法
        /// </summary>
        /// <param name="code">需要压缩的16进制编码</param>
        /// <returns>
        /// 返回压缩完的算法
        /// </returns>
        public static string ZebraCompressCode(string code)
        {
            List<CompressCodeInfo> list = new List<CompressCodeInfo>();
            char flag = '.';
            int charCount = 0;
            for (int i = 0; i < code.Length; i++)
            {
                char item = code[i];
                if (item != flag)
                {
                    if (charCount > 0)
                    {
                        list.Add(new CompressCodeInfo(flag.ToString(), charCount));
                    }
                    charCount = 0;
                    flag = item;
                }
                charCount += 1;
                if (i == code.Length - 1)
                {
                    if (charCount > 0)
                    {
                        list.Add(new CompressCodeInfo(flag.ToString(), charCount));
                    }
                }
            }
            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < list.Count; i++)
            {
                CompressCodeInfo item = list[i];
                if (item.Count == 0)
                {
                    continue;
                }
                if (item.Count == 1)
                {
                    builder.Append(item.Code);
                    continue;
                }
                if (item.Count <= 20)
                {
                    builder.AppendFormat("{0}{1}", ((CompressCode)item.Count).ToString(), item.Code);
                    continue;
                }
                int count = 0;
                while (true)
                {
                    if (item.Count - count <= 0)
                    {
                        break;
                    }
                    if (item.Count - count < 20)
                    {
                        builder.AppendFormat("{0}{1}", ((CompressCode)(item.Count - count)).ToString(), item.Code);
                        break;
                    }
                    if ((item.Count - count) >= (int)CompressCode.z)
                    {
                        count += (int)CompressCode.z;
                        builder.AppendFormat("{0}{1}", (CompressCode.z).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.y)
                    {
                        count += (int)CompressCode.y;
                        builder.AppendFormat("{0}{1}", (CompressCode.y).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.x)
                    {
                        count += (int)CompressCode.x;
                        builder.AppendFormat("{0}{1}", (CompressCode.x).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.w)
                    {
                        count += (int)CompressCode.w;
                        builder.AppendFormat("{0}{1}", (CompressCode.w).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.v)
                    {
                        count += (int)CompressCode.v;
                        builder.AppendFormat("{0}{1}", (CompressCode.v).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.u)
                    {
                        count += (int)CompressCode.u;
                        builder.AppendFormat("{0}{1}", (CompressCode.u).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.t)
                    {
                        count += (int)CompressCode.t;
                        builder.AppendFormat("{0}{1}", (CompressCode.t).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.s)
                    {
                        count += (int)CompressCode.s;
                        builder.AppendFormat("{0}{1}", (CompressCode.s).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.r)
                    {
                        count += (int)CompressCode.r;
                        builder.AppendFormat("{0}{1}", (CompressCode.r).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.q)
                    {
                        count += (int)CompressCode.q;
                        builder.AppendFormat("{0}{1}", (CompressCode.q).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.p)
                    {
                        count += (int)CompressCode.p;
                        builder.AppendFormat("{0}{1}", (CompressCode.p).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.o)
                    {
                        count += (int)CompressCode.o;
                        builder.AppendFormat("{0}{1}", (CompressCode.o).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.n)
                    {
                        count += (int)CompressCode.n;
                        builder.AppendFormat("{0}{1}", (CompressCode.n).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.m)
                    {
                        count += (int)CompressCode.m;
                        builder.AppendFormat("{0}{1}", (CompressCode.m).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.l)
                    {
                        count += (int)CompressCode.l;
                        builder.AppendFormat("{0}{1}", (CompressCode.l).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.k)
                    {
                        count += (int)CompressCode.k;
                        builder.AppendFormat("{0}{1}", (CompressCode.k).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.j)
                    {
                        count += (int)CompressCode.j;
                        builder.AppendFormat("{0}{1}", (CompressCode.j).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.i)
                    {
                        count += (int)CompressCode.i;
                        builder.AppendFormat("{0}{1}", (CompressCode.i).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.h)
                    {
                        count += (int)CompressCode.h;
                        builder.AppendFormat("{0}{1}", (CompressCode.h).ToString(), item.Code);
                    }
                    else if ((item.Count - count) >= (int)CompressCode.g)
                    {
                        count += (int)CompressCode.g;
                        builder.AppendFormat("{0}{1}", (CompressCode.g).ToString(), item.Code);
                    }
                }
            }
            return builder.ToString();
        }
    }
}