using SharpChat.Misuzu;
using SharpChat.SockChat.PacketsS2C;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace SharpChat.SockChat.PacketsC2S {
    public class PingC2SPacketHandler : IC2SPacketHandler {
        private readonly MisuzuClient Misuzu;

        private readonly TimeSpan BumpInterval = TimeSpan.FromMinutes(1);
        private DateTimeOffset LastBump = DateTimeOffset.MinValue;

        public PingC2SPacketHandler(MisuzuClient msz) {
            Misuzu = msz;
        }

        public bool IsMatch(C2SPacketHandlerContext ctx) {
            return ctx.CheckPacketId("0");
        }

        public void Handle(C2SPacketHandlerContext ctx) {
            string[] parts = ctx.SplitText(2);

            if(!int.TryParse(parts.FirstOrDefault(), out int pTime))
                return;

            ctx.Connection.BumpPing();
            ctx.Connection.Send(new PongS2CPacket());

            ctx.Chat.ContextAccess.Wait();
            try {
                if(LastBump < DateTimeOffset.UtcNow - BumpInterval) {
                    List<(string, string)> bumpList = new();

                    foreach(UserInfo userInfo in ctx.Chat.Users.All) {
                        if(ctx.Chat.UserStatuses.GetStatus(userInfo) != UserStatus.Online)
                            continue;

                        string[] remoteAddrs = ctx.Chat.Connections.GetUserRemoteAddresses(userInfo);
                        if(remoteAddrs.Length < 1)
                            continue;

                        bumpList.Add((userInfo.UserId.ToString(), remoteAddrs[0]));
                    }

                    if(bumpList.Count > 0)
                        Task.Run(async () => {
                            await Misuzu.BumpUsersOnlineAsync(bumpList);
                        }).Wait();

                    LastBump = DateTimeOffset.UtcNow;
                }
            } finally {
                ctx.Chat.ContextAccess.Release();
            }
        }
    }
}