#include "Protocol.h"
#include "PacketReader.h"
#include "PacketTypes.h"
#include "MinecraftClient.h"
#include "DedicatedServer.h"

#include <string>

namespace Feather
{
    void Protocol::HandlePacket(MinecraftClient& client, PacketReader& packet)
    {
        auto& context = client.GetContext();
        switch (context.GetState())
        {
            case ProtocolState::Handholding:
            {
                auto id = packet.ReadVarInt<ServerboundHandholdingPacketId>();
                uint8_t legacyId = packet.Peek<uint8_t>();
                if (id != ServerboundHandholdingPacketId::Handshake && legacyId != LegacyServerListPing)
                {
                    printf("[Protocol] Client sent packet with non-zero ID 0x%x while state was HANDSHAKING\n", id);
                    break;
                }

                if (id != ServerboundHandholdingPacketId::Handshake)
                {
                    // Legacy server ping.
                    // TODO: Do server list ping here.
                    break;
                }

                int clientProtocolVersion = packet.ReadVarInt();
                string serverIp = packet.ReadString();
                uint16_t port = packet.Read<uint16_t>();
                
                // next desired state
                ProtocolState intention = packet.ReadVarInt<ProtocolState>();

                printf("[Protocol] Client Intention Packet: version=%d, serverIp=%s, port=%u, intention=%d\n",
                    clientProtocolVersion,
                    serverIp.c_str(),
                    port,
                    intention
                );

                context.SetState(intention);

                break;
            }

            case ProtocolState::Status:
            {
                auto id = packet.ReadVarInt<ServerboundStatusPacketId>();
                switch (id)
                {
                    case ServerboundStatusPacketId::Request:
                    {
                        printf("[Protocol] Client sent STATUS_PING_REQUEST\n");

                        std::string status = m_server.GetStatus().GetServerStatusJSON();

                        NetworkMessage msg(VARINT_MAX_SIZE + status.length());
                        // Packet ID
                        msg.WriteVarInt(ClientBoundStatusPacketId::Response);
                        // JSON Contents
                        msg.WriteString(status.c_str(), static_cast<int32_t>(status.length()));
                        msg.Finalize();
                        client.SendMessage(msg);

                        break;
                    }
                    case ServerboundStatusPacketId::Ping:
                    {
                        int64_t timestamp = packet.Read<int64_t>();
                        printf("[Protocol] Client sent STATUS_PING: %lld\n", timestamp);

                        NetworkMessage msg(VARINT_MAX_SIZE + sizeof(int64_t));

                        msg.WriteVarInt(ClientBoundStatusPacketId::Pong);
                        msg.Write<uint64_t>(timestamp);
                        msg.Finalize();

                        client.SendMessage(msg);

                        break;
                    }
                }
                break;
            }

            case ProtocolState::Login:
            {
                auto id = packet.ReadVarInt<ServerboundLoginPacketId>();

                switch (id)
                {
                    case ServerboundLoginPacketId::LoginStart:
                    {
                        std::string username = packet.ReadString();
                        std::string uuid = "ecb99913-96a8-40a7-8529-a2ca6ad95768";

                        uuid.resize(36);
                        username.resize(16);

                        NetworkMessage msg(VARINT_MAX_SIZE * 3 + uuid.length() + username.length());

                        msg.WriteVarInt(ClientboundLoginPacketId::LoginSuccess);
                        // UUID 1.16.1
                        msg.Write<uint64_t>(4658857991808325907LL);
                        msg.Write<uint64_t>(7518717155607718277LL);

                        // UUID 1.15.2
                        //msg.WriteString(uuid.c_str(), uuid.length());

                        msg.WriteString(username.c_str(), username.length());
                        msg.Finalize();

                        client.SendMessage(msg);

                        break;
                    }
                }

                break;
            }
        }
    }
}