using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using NetworkFramework.Shared;

namespace CLre_server.API.Synergy
{
    struct SerializedCLreHandshake: ISerializedNetData
    {
        private byte major;
        private byte minor;
        private byte patch;

        private HandshakeFlag flags;

        private List<string> modInfo;
        
        public Version Version
        {
            get => new Version(major, minor, patch);
            set
            {
                major = (byte)value.Major;
                minor = (byte)value.Minor;
                patch = (byte)value.Build;
            }
        }

        public IEnumerable<string> Mods
        {
            get => modInfo.ToArray();
            set
            {
                modInfo.Clear();
                foreach (var mod in value)
                {
                    modInfo.Add(mod);
                }
            }
        }
        
        public byte[] Serialize()
        {
            using (MemoryStream stream = new MemoryStream())
            {
                using (BinaryWriter writer = new BinaryWriter(stream))
                {
                    // version
                    writer.Write(major);
                    writer.Write(minor);
                    writer.Write(patch);
                    writer.Write((uint)flags);
                    writer.Write(modInfo.Count);
                    foreach (string mod in modInfo)
                    {
                        writer.Write(mod);
                    }
                    return stream.ToArray();
                }
            }
        }

        public void Deserialize(byte[] data)
        {
            using (MemoryStream stream = new MemoryStream(data))
            {
                using (BinaryReader reader = new BinaryReader(stream))
                {
                    // version
                    major = reader.ReadByte();
                    minor = reader.ReadByte();
                    patch = reader.ReadByte();
                    flags = (HandshakeFlag) reader.ReadUInt32();
                    int modCount = reader.ReadInt32();
                    modInfo = new List<string>(modCount);
                    for (int i = 0; i < modCount; i++)
                    {
                        modInfo.Add(reader.ReadString());
                    }
                }
            }
        }

        public bool HasFlag(HandshakeFlag f)
        {
            return (flags & f) != HandshakeFlag.None;
        }
        
        public void SetFlag(HandshakeFlag f)
        {
            flags |= f;
        }
        
        public void UnsetFlag(HandshakeFlag f)
        {
            flags &= ~f;
        }

        public static SerializedCLreHandshake Current()
        {
            Version v = Assembly.GetExecutingAssembly().GetName().Version;
            List<string> mods = new List<string>();
            foreach (var plugin in IllusionInjector.PluginManager.Plugins)
            {
                mods.Add(plugin.Name);
            }

            return new SerializedCLreHandshake
            {
                major = (byte) v.Major,
                minor = (byte) v.Minor,
                patch = (byte) v.Build,
                flags = HandshakeFlag.Server,
                modInfo = mods,
            };
        }
        
        public static SerializedCLreHandshake RequireCLre()
        {
            Version v = Assembly.GetExecutingAssembly().GetName().Version;
            List<string> mods = new List<string>(new []{Assembly.GetExecutingAssembly().GetName().Name});

            return new SerializedCLreHandshake
            {
                major = (byte) v.Major,
                minor = (byte) v.Minor,
                patch = (byte) v.Build,
                flags = HandshakeFlag.Client | HandshakeFlag.RequireAll,
                modInfo = mods,
            };
        }
        
        public static SerializedCLreHandshake Empty()
        {
            return new SerializedCLreHandshake
            {
                major = 0,
                minor = 0,
                patch = 0,
                modInfo = new List<string>(),
            };
        }

        public override string ToString()
        {
            return $"CLre {Version} ({modInfo.Count} mods)";
        }
    }

    [Flags]
    enum HandshakeFlag : uint
    {
        None = 0,
        Client = 1,
        Server = 1 << 1,
        RequireAll = 1 << 2,
        OptionalAll = 1 << 3,
        Confirm = 1 << 4,
    }
}