using System.Collections.Generic;
using XWorld.Framework;

namespace XWorld.Framework.Protocol
{
    // 框架通道(Channel.Framework)的 opcode；数值是线网契约，禁止随意改动
    public enum FrameworkOpcode : ushort
    {
        Heartbeat = 1,
        MatchRequest = 2,
        MatchFound = 3,
        GameInput = 4,
        Snapshot = 5,
        RoomEnd = 6,
        Error = 7,
        GameListRequest = 8,
        GameListResponse = 9,
        RandomMatchRequest = 10,
        MatchAssigned = 11,
        LobbyJoin = 12,
        LobbyState = 13,
        LobbyMove = 14,
        LobbyLeave = 15,
    }

    public sealed class HeartbeatMsg
    {
        public long ClientTimeMs;

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarLong(ClientTimeMs);
            return w.ToArray();
        }

        public static HeartbeatMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new HeartbeatMsg { ClientTimeMs = r.ReadVarLong() };
        }
    }

    public sealed class MatchRequestMsg
    {
        public string GameId; // null 编码为空字符串
        public int Version;

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteString(GameId);
            w.WriteVarInt(Version);
            return w.ToArray();
        }

        public static MatchRequestMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new MatchRequestMsg { GameId = r.ReadString(), Version = r.ReadVarInt() };
        }
    }

    public sealed class MatchFoundMsg
    {
        public string RoomId; // null 编码为空字符串
        public int Version;
        public int SelfPlayerId;
        public List<PlayerInfo> Players = new List<PlayerInfo>();

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteString(RoomId);
            w.WriteVarInt(Version);
            w.WriteVarInt(SelfPlayerId);
            w.WriteVarUInt((uint)Players.Count);
            foreach (var p in Players)
            {
                w.WriteVarInt(p.PlayerId);
                w.WriteString(p.Name);
                w.WriteBool(p.IsAI);
            }
            return w.ToArray();
        }

        public static MatchFoundMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            var m = new MatchFoundMsg
            {
                RoomId = r.ReadString(),
                Version = r.ReadVarInt(),
                SelfPlayerId = r.ReadVarInt(),
            };
            uint n = r.ReadVarUInt();
            for (uint i = 0; i < n; i++)
            {
                m.Players.Add(new PlayerInfo
                {
                    PlayerId = r.ReadVarInt(),
                    Name = r.ReadString(),
                    IsAI = r.ReadBool(),
                });
            }
            return m;
        }
    }

    public sealed class GameInfoMsg
    {
        public string GameId;
        public int Version;
        public string DisplayName;
        public int MinPlayers;
        public int MaxPlayers;
    }

    public sealed class GameListResponseMsg
    {
        public List<GameInfoMsg> Games = new List<GameInfoMsg>();

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarUInt((uint)Games.Count);
            foreach (var g in Games)
            {
                w.WriteString(g.GameId);
                w.WriteVarInt(g.Version);
                w.WriteString(g.DisplayName);
                w.WriteVarInt(g.MinPlayers);
                w.WriteVarInt(g.MaxPlayers);
            }
            return w.ToArray();
        }

        public static GameListResponseMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            var msg = new GameListResponseMsg();
            uint n = r.ReadVarUInt();
            for (uint i = 0; i < n; i++)
            {
                msg.Games.Add(new GameInfoMsg
                {
                    GameId = r.ReadString(),
                    Version = r.ReadVarInt(),
                    DisplayName = r.ReadString(),
                    MinPlayers = r.ReadVarInt(),
                    MaxPlayers = r.ReadVarInt(),
                });
            }
            return msg;
        }
    }

    public sealed class MatchAssignedMsg
    {
        public string GameId;
        public int Version;

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteString(GameId);
            w.WriteVarInt(Version);
            return w.ToArray();
        }

        public static MatchAssignedMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new MatchAssignedMsg { GameId = r.ReadString(), Version = r.ReadVarInt() };
        }
    }

    // 把一条小游戏业务输入封进框架通道（也可直接走 Channel.Game，二者择一，详见服务端子项目）
    public sealed class GameInputMsg
    {
        public ushort GameOpcode;
        public byte[] Payload; // null 与空数组线网等价，Decode 恒返回非 null

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteUInt16(GameOpcode);
            w.WriteBytes(Payload);
            return w.ToArray();
        }

        public static GameInputMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new GameInputMsg { GameOpcode = r.ReadUInt16(), Payload = r.ReadBytes() };
        }
    }

    public sealed class SnapshotMsg
    {
        public int Tick;
        public byte[] StateBlob; // 由小游戏 Core.Encode(state) 产出，框架不解释内容；同上：null 与空等价

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarInt(Tick);
            w.WriteBytes(StateBlob);
            return w.ToArray();
        }

        public static SnapshotMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new SnapshotMsg { Tick = r.ReadVarInt(), StateBlob = r.ReadBytes() };
        }
    }

    public sealed class RoomEndMsg
    {
        public int WinnerPlayerId; // 0 表示平局/无胜者
        public byte[] ResultBlob;  // 小游戏自定义结算数据；同上：null 与空等价

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarInt(WinnerPlayerId);
            w.WriteBytes(ResultBlob);
            return w.ToArray();
        }

        public static RoomEndMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new RoomEndMsg { WinnerPlayerId = r.ReadVarInt(), ResultBlob = r.ReadBytes() };
        }
    }

    public sealed class ErrorMsg
    {
        public int Code;
        public string Message; // null 编码为空字符串

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarInt(Code);
            w.WriteString(Message);
            return w.ToArray();
        }

        public static ErrorMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new ErrorMsg { Code = r.ReadVarInt(), Message = r.ReadString() };
        }
    }

    public sealed class LobbyJoinMsg
    {
        public string Name;
        public int Figure;

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteString(Name);
            w.WriteVarInt(Figure);
            return w.ToArray();
        }

        public static LobbyJoinMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new LobbyJoinMsg { Name = r.ReadString(), Figure = r.ReadVarInt() };
        }
    }

    public sealed class LobbyPlayerMsg
    {
        public int PlayerId;
        public string Name;
        public int Figure;
        public float X;
        public float Y;
        public float Z;
        public float DirX;
        public float DirZ;
        public bool Moving;

        public void Encode(PacketWriter w)
        {
            w.WriteVarInt(PlayerId);
            w.WriteString(Name);
            w.WriteVarInt(Figure);
            w.WriteSingle(X);
            w.WriteSingle(Y);
            w.WriteSingle(Z);
            w.WriteSingle(DirX);
            w.WriteSingle(DirZ);
            w.WriteBool(Moving);
        }

        public static LobbyPlayerMsg Decode(PacketReader r)
        {
            return new LobbyPlayerMsg
            {
                PlayerId = r.ReadVarInt(),
                Name = r.ReadString(),
                Figure = r.ReadVarInt(),
                X = r.ReadSingle(),
                Y = r.ReadSingle(),
                Z = r.ReadSingle(),
                DirX = r.ReadSingle(),
                DirZ = r.ReadSingle(),
                Moving = r.ReadBool(),
            };
        }
    }

    public sealed class LobbyStateMsg
    {
        public List<LobbyPlayerMsg> Players = new List<LobbyPlayerMsg>();

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarUInt((uint)Players.Count);
            foreach (var p in Players) p.Encode(w);
            return w.ToArray();
        }

        public static LobbyStateMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            var m = new LobbyStateMsg();
            uint n = r.ReadVarUInt();
            for (uint i = 0; i < n; i++)
            {
                m.Players.Add(LobbyPlayerMsg.Decode(r));
            }
            return m;
        }
    }

    public sealed class LobbyMoveMsg
    {
        public int PlayerId;
        public float X;
        public float Y;
        public float Z;
        public float DirX;
        public float DirZ;
        public bool Moving;

        public byte[] Encode()
        {
            var w = new PacketWriter();
            w.WriteVarInt(PlayerId);
            w.WriteSingle(X);
            w.WriteSingle(Y);
            w.WriteSingle(Z);
            w.WriteSingle(DirX);
            w.WriteSingle(DirZ);
            w.WriteBool(Moving);
            return w.ToArray();
        }

        public static LobbyMoveMsg Decode(byte[] data)
        {
            var r = new PacketReader(data);
            return new LobbyMoveMsg
            {
                PlayerId = r.ReadVarInt(),
                X = r.ReadSingle(),
                Y = r.ReadSingle(),
                Z = r.ReadSingle(),
                DirX = r.ReadSingle(),
                DirZ = r.ReadSingle(),
                Moving = r.ReadBool(),
            };
        }
    }
}