using System.Collections.Concurrent;
using ServerCommon;
using ServerCore;

namespace GameServer;

public class P2PDataWriteState : P2PDataLogStateBase
{
    private ConcurrentDictionary<string /*user_guid*/, P2PDataInfoLog> m_all_user_p2p_packet_infos = new();
    private CancellationTokenSource m_cancel_token = new();
    public DateTime m_last_check_time { get; set; } = DateTimeHelper.Current;
    readonly int m_record_check_time_min = 1;
    private PeriodicTaskTimer? m_task_nullable = null;
    public P2PDataWriteState() : base(true)
    {
    }
    

    public override void enter()
    {
        try
        {
            m_cancel_token = new();
            m_task_nullable = new PeriodicTaskTimer( GetType().Name, Constant.P2P_PACKET_DATA_CHECK_INTERVAL_MSEC, m_cancel_token, onTaskTick);
            Log.getLogger().debug("activeMonitoring task created");
        }
        catch(Exception e)
        {
            var err_msg = $"Exception !!!, new PeriodicTaskTimer() : exception:{e}";
            Log.getLogger().error(err_msg);
        }
    }

    public override async Task update()
    {
        //if (m_check_active == false) return;

        Log.getLogger().debug("p2p monitoring update start");

        var users = GameServerApp.getServerLogic().getPlayerManager().getUsers();
        foreach (var player in users.Values)
        {
            if (player is null) continue;
            
            var user_create_or_load_action = player.getEntityAction<UserCreateOrLoadAction>();                
            if (false == user_create_or_load_action.isCompletedLoadUser())
            {
                continue;
            }
            dataAccumulate(player);
        }
        
        recordDataTotalInfo();

        
        //더이상 패킷이 들어오지 않는 데이터는 삭제 처리 
        deleteOldData();
        await dataAccumulateStateCheck();
        Log.getLogger().debug("p2p monitoring update done");
    }

    public override async void exit()
    {
        try
        {
            if (m_cancel_token != null && !m_cancel_token.IsCancellationRequested)
            {
                m_cancel_token.Cancel();
            }

            if (m_task_nullable != null)
            {
                try
                {
                    await m_task_nullable.getTask();
                }
                catch (Exception ex)
                {
                    Log.getLogger().warn($"Task 예외 발생 (무시됨): {ex}");
                }

                m_task_nullable = null;
            }

            m_cancel_token?.Dispose();
            //m_cancel_token = null;
        }
        catch (Exception e)
        {
            Log.getLogger().error($"Exception !!!, stopTaskSafelyAsync() : exception:{e}");
        }
        
        ServerBase.Monitor.It.setReceivedP2PDataInfo();
        Log.getLogger().debug("p2p monitoring exit");
    }

    private async Task dataAccumulateStateCheck()
    {
        if (m_all_user_p2p_packet_infos.Keys.Count == 0)
        {
            await P2PDataLogManager.It.inactiveMonitoring();
            Log.getLogger().debug("p2p incactive monitoring");
        }
    }

    private async Task onTaskTick()
    {
        await update();
    }

    public void deleteOldData()
    {
        var now = DateTimeHelper.Current;

        var delete_users = new List<string>();
        foreach (var infos in m_all_user_p2p_packet_infos)
        {
            var user_guid = infos.Key;
            var info = infos.Value;
            
            var player_manager = GameServerApp.getServerLogic().getPlayerManager();
            if (player_manager.tryGetUserByPrimaryKey(user_guid, out var found_user) == false) continue;

            var p2p_data_action = found_user.getEntityAction<P2PDataAction>();
            if (p2p_data_action is null)
            {
                m_all_user_p2p_packet_infos.TryRemove(user_guid, out _);
                continue;
            }

            var elapsed_update_time = p2p_data_action.m_last_update_time.AddMinutes(m_record_check_time_min);

            if (elapsed_update_time < now)
            {
                delete_users.Add(user_guid);
            }
        }
        
        foreach (var user_guid in delete_users)
        {
            m_all_user_p2p_packet_infos.TryRemove(user_guid, out _);
            Log.getLogger().debug($"delete old p2p packet data userGuid : {user_guid}");
        }
    }
    
    public void dataAccumulate(Player player)
    {
        if (false == m_all_user_p2p_packet_infos.TryGetValue(player.getUserGuid(), out var info_log))
        {
            info_log = new P2PDataInfoLog();
            m_all_user_p2p_packet_infos.TryAdd(player.getUserGuid(), info_log);
        }
        var p2p_data_action = player.getEntityAction<P2PDataAction>();
        var now = DateTimeHelper.Current;
        foreach (var data in p2p_data_action.m_data)
        {
            var id = data.Key;
            var packet_count = data.Value.m_packet_count;
            var packet_size = data.Value.m_total_packet_size;

            if (packet_count == info_log.m_total_packet_count) continue;
                
            info_log.m_total_packet_count = packet_count;
            info_log.m_total_packet_size = packet_size;
            info_log.m_last_recorded_time = now;
            m_last_check_time = now;
        }
    }
    
    public void recordDataTotalInfo()
    {
        
        var user_count = m_all_user_p2p_packet_infos.Keys.Count;
        long total_count = 0;
        long total_size = 0;
        foreach (var info in m_all_user_p2p_packet_infos.Values)
        {
            total_count += info.m_total_packet_count;
            total_size += info.m_total_packet_size;
        }
        ServerBase.Monitor.It.setReceivedP2PDataInfo(total_size, total_count, user_count);
        Log.getLogger().debug($"recordDataTotalInfo data send total_size : {total_size}, total_count : {total_count}, user_count : {user_count}");
        
    }

}