using System;

namespace Sog
{
    /*
         64-61	4b		inst id             (1-15)
         60-57  4b      server type index   (1-15)
         56-47  10b     worldid             (1-1023) 
         46-15	32b		time
         14-1	14b		seq = 16384
     */

    public class ServerUniqueIDMgr
    {
        public readonly uint UID_START_TIME = 1655827200; //2022/6/22

        private ulong baseUUid;

        private ulong timeGap;

        private ulong uuid;

        private const int InstIdBitNum = 4;
        private const int servertypeindexBitNum = 4;
        private const int worldIdBitNum = 10;

        private static ServerType[] UsedServerTypes = { ServerType.Game, ServerType.Arena, ServerType.Account}; 

        public ServerUniqueIDMgr(uint serverId)
        {
            int serverType = ServerIDUtils.GetServerType(serverId);
            uint instId = ServerIDUtils.GetInstanceID(serverId);
            uint worldId = ServerIDUtils.GetWorldID(serverId);

            int serverTypeIndex = -1;
            for (int i = 0; i < UsedServerTypes.Length; i++)
            {
                if(serverType == (int)UsedServerTypes[i])
                {
                    serverTypeIndex = i;
                    break;
                }
            }

            if(serverTypeIndex == -1)
            {
                throw new Exception("servertype need add to UsedServerTypes");
            }

            if (instId >= (1 << InstIdBitNum))
            {
                throw new Exception("instId overflow");
            }

            if (serverTypeIndex >= (1 << servertypeindexBitNum))
            {
                throw new Exception("serverTypeIndex overflow");
            }

            if (worldId >= (1 << worldIdBitNum))
            {
                throw new Exception("worldId overflow");
            }

            timeGap = (ulong)(AppTime.GetNowSysSecond() - UID_START_TIME);

            baseUUid = ((ulong)instId << 60) | ((ulong)serverTypeIndex << 56) | ((ulong)worldId << 46) | (timeGap << 14);

            uuid = baseUUid;
        }

        public ulong GenUniqueId()
        {
            uuid++;

            return uuid;
        }
    }
}