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

using Sog;

namespace Account
{
    public static class DeviceIdLimitSvc
    {
        /// <summary>
        /// 是否被限制登录(同设备id相同时间内登录帐号数量限制)
        /// </summary>
        /// <param name="accountType"></param>
        /// <param name="accountId"></param>
        /// <param name="deviceId"></param>
        /// <returns></returns>
        public static bool CheckDeviceIdLimited(int accountType,string accountId, string deviceId)
        {
            int countLimit = AccountServerUtils.GetServerConfig().deviceIdFBAccountLimit;
            int timeLimit = AccountServerUtils.GetServerConfig().deviceIdFBAccountLimitTime;
            //配置了关闭限制功能
            if (countLimit <= 0
                || timeLimit <= 0)
            {
                return false;
            }

            //游客不做限制
            if(accountType == (int)AccountType.AccountType_Guest)
            {
                return false;
            }

            if(string.IsNullOrEmpty(deviceId))
            {
                TraceLog.Error("DeviceIdLimitSvc.CheckDeviceIdLimited id {0} invalid deviceId", accountId);
                return true;
            }

            long now = AccountServerUtils.GetTimeSecond();
            var deviceIdMap = AccountServerUtils.GetAccountServerData().m_devicdIdMap;
            List<DevicdIDFBAccountInfo> list;
            if (deviceIdMap.ContainsKey(deviceId) == false)
            {
                list = new List<DevicdIDFBAccountInfo>();
                DevicdIDFBAccountInfo info = new DevicdIDFBAccountInfo();
                info.AccountID = accountId;
                info.LastLoginTime = now;
                list.Add(info);

                deviceIdMap.Add(deviceId, list);
            }
            else
            {
                list = deviceIdMap[deviceId];
            }

            foreach(var info in list)
            {
                //旧有的account，允许登录
                if(info.AccountID == accountId)
                {
                    info.LastLoginTime = now;
                    TraceLog.Trace("DeviceIdLimitSvc.CheckDeviceIdLimited id {0} already in list,can login", accountId);
                    return false;
                }
            }

            
            //删除过期的帐号记录
            for(int i = list.Count - 1; i >= 0; i--)
            {
                var info = list[i];
                if (now - info.LastLoginTime >= timeLimit)
                {
                    TraceLog.Trace("DeviceIdLimitSvc.CheckDeviceIdLimited delete timeout accountId {0}", info.AccountID);
                    list.RemoveAt(i);
                }
            }

            //允许登录，添加帐号信息
            if (list.Count < countLimit)
            {
                DevicdIDFBAccountInfo info = new DevicdIDFBAccountInfo();
                info.AccountID = accountId;
                info.LastLoginTime = now;
                list.Add(info);

                TraceLog.Trace("DeviceIdLimitSvc.CheckDeviceIdLimited id {0} add to list,can login", accountId);

                return false;
            }

            TraceLog.Error("DeviceIdLimitSvc.CheckDeviceIdLimited id {0} be limited by deviceid {1}", accountId,deviceId);

            return true;
        }
    }
}