using STcpHelper.Packet;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using System.Threading.Tasks;

namespace STcpHelper.Packet
{
    public class STcpClientListResPacket : ISTcpPacket
    {
        public List<string> Clients { get; private set; }

        public STcpClientListResPacket(List<TcpClient> clinets)
        {
            this.Clients = new List<string>();
            foreach (var client in clinets)
            {
                this.Clients.Add(client.Client.RemoteEndPoint.ToString());
            }
        }

        public STcpClientListResPacket(byte[] dataBuffer)
        {
            int cursor = 0;
            short length = IPAddress.NetworkToHostOrder(BitConverter.ToInt16(dataBuffer, cursor));
            cursor += sizeof(short);

            string jsonString = SEncoding.GetString(dataBuffer, cursor, length);
            List<string> clients = JsonSerializer.Deserialize<List<string>>(jsonString);

            this.Clients = clients;
        }

        public byte[] Serialize()
        {
            string jsonString = JsonSerializer.Serialize(this.Clients);
            byte[] data = SEncoding.GetBytes(jsonString);
            byte[] dataLength = BitConverter.GetBytes(IPAddress.HostToNetworkOrder((short)data.Length));

            // 4bytes header
            STcpPacketHeader header = new STcpPacketHeader(PacketType.RES_CLIENT_LIST, dataLength.Length + data.Length);

            // [header][2bytes size][n bytes string]
            return SBufferHelper.GetBuffer(4 + dataLength.Length + data.Length, header.Serialize(), dataLength, data);
        }
    }
}