using System.IO;
using System.Threading.Tasks;

namespace Passer.Control {

    public static class SiteServer {
        public static async Task ReceiveData(Stream dataStream, Client client) {
            while (true) {
                byte packetSize = (byte)dataStream.ReadByte();
                if (packetSize == 0xFF)
                    //Debug.Log("Receive timeout");
                    // Timeout
                    ;
                else
                    await ReceiveData(dataStream, client, packetSize);
            }
        }

        public static async Task ReceiveData(Stream dataStream, Client client, byte packetSize) {
            byte msgId = (byte)dataStream.ReadByte();
            if (msgId == 0xFF) {
                // Timeout
                return;
            }

            bool result = false;
            switch (msgId) {
                case PoseMsg.Id: // Object Pose (16)
                    result = await PoseMsg.Receive(dataStream, client, packetSize);
                    break;
                case DestroyMsg.Id: // Destroy object (32)
                    result = await DestroyMsg.Receive(dataStream, client, packetSize);
                    break;
                case ThingMsg.Id:
                    result = await ThingMsg.Receive(dataStream, client, packetSize);
                    break;
                case InvestigateMsg.Id:
                    result = await InvestigateMsg.Receive(dataStream, client, packetSize);
                    break;
                case ModelUrlMsg.Id: // Model URL (144)
                    result = await BytesMsg.Receive(dataStream, client, packetSize);
                    break;
                case NameMsg.Id: // Object Name (145)
                    result = await NameMsg.Receive(dataStream, client, packetSize);
                    break;
                case ClientMsg.Id:
                    result = await ClientMsg.Receive(dataStream, client, packetSize);
                    break;
                case NetworkIdMsg.Id:
                    result = await NetworkIdMsg.Receive(dataStream, client, packetSize);
                    break;
                //case TextMsg.Id: // Text (176)
                //    result = await TextMsg.Receive(dataStream, client, packetSize);
                //    break;
                case BytesMsg.Id:
                    result = await BytesMsg.Receive(dataStream, client, packetSize);
                    break;
                default:
                    break;
            }
            if (result == false) {
                packetSize = msgId; // skip 1 byte, msgId is possibly a packet size byte
                await ReceiveData(dataStream, client, packetSize);
            }
        }

        public static void ProcessMessage(ISiteServer site, Client client, IMessage msg) {
            switch (msg) {
                case NetworkIdMsg networkId:
                    site.ProcessNetworkId(client, networkId);
                    break;
                case ModelUrlMsg modelUrl:
                    site.ProcessModelUrl(client, modelUrl);
                    break;
            }
        }
    }

    public interface ISiteServer {

        public void ProcessNetworkId(Client client, NetworkIdMsg networkId);
        public void ProcessModelUrl(Client client, ModelUrlMsg modelUrl);
    }
}