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

namespace Sog
{
    /// <summary>
    /// xx.xx.code
    /// main.min.buildcode
    /// </summary>
    public static class AppVersion
    {
        public const int VersionSegNum = 3;

        public static string ToStringVersion(long version, int verSegNum = VersionSegNum)
        {
            if (verSegNum == 3)
            {
                long v1 = (version >> 32) & 0xffff;
                long v2 = (version >> 16) & 0xffff;
                long v3 = version & 0xffff;
                return v1 + "." + v2 + "." + v3;
            }
            
            if (verSegNum == 4)
            {
                long v1 = version >> 48;
                long v2 = (version >> 32) & 0x0000ffff;
                long v3 = (version & 0xffff0000) >> 16;
                long vCode = (version & 0x0000ffff);
                return v1 + "." + v2 + "." + v3 + "." + vCode;
            }

            return "";
        }

        public static long ToIntVersion(string version, int verSegNum = VersionSegNum)
        {
            try
            {
                string[] arrayID = version.Split('.');

                // 非法版本号
                if (arrayID.Length < verSegNum || (verSegNum != 3 && verSegNum != 4))
                {
                    return 0;
                }

                long v1 = UInt16.Parse(arrayID[0]);
                long v2 = UInt16.Parse(arrayID[1]);
                long v3 = UInt16.Parse(arrayID[2]);
                long iVersion;

                if (arrayID.Length == 3)
                {
                    iVersion = (v1 << 32) + (v2 << 16) + v3;
                }
                else
                {
                    long vCode = UInt16.Parse(arrayID[3]);
                    iVersion = (v1 << 48) + (v2 << 32) + (v3 << 16) + vCode;
                }

                return iVersion;
            }
            catch(Exception)
            {
                return 0;
            }
        }

        public static int GetLastVersion(string version, int verSegNum = VersionSegNum)
        {
            try
            {
                string[] arrayID = version.Split('.');

                // 非法版本号
                if (arrayID.Length < verSegNum || verSegNum != 3)
                {
                    TraceLog.Error("AppVersion.GetLastVersion error version {0}", version);
                    return 0;
                }

                int lastVersion = Int32.Parse(arrayID[2]);
                return lastVersion;
            }
            catch (Exception)
            {
                TraceLog.Error("AppVersion.GetLastVersion error version {0}", version);
                return 0;
            }
        }

        public static ushort GetCodeFromVersion(long version, int verSegNum = VersionSegNum)
        {
            if (verSegNum == 3)
            {
                return 0;
            }

            long vCode = (version & 0x0000ffff);
            return (ushort)vCode;
        }

        public static ushort GetMinFromVersion(long version, int verSegNum = VersionSegNum)
        {
            if (verSegNum == 3)
            {
                return (ushort)(version & 0xffff);
            }

            long v3 = (version & 0xffff0000) >> 16;
            return (ushort)v3;
        }

        public static ushort GetMidFromVersion(long version, int verSegNum = VersionSegNum)
        {
            if (verSegNum == 3)
            {
                return (ushort)((version >> 16) & 0xffff);
            }
                
            long v2 = (version >> 32) & 0x0000ffff;
            return (ushort)v2;
        }

        public static ushort GetMaxFromVersion(long version, int verSegNum = VersionSegNum)
        {
            if (verSegNum == 3)
            {
                return (ushort)((version >> 32) & 0xffff);
            }
            
            long v1 = version >> 48;
            return (ushort)v1;
        }



    }
}