using System;
using System.IO;
using System.Xml.Serialization;
using System.Linq;
using System.Collections.Generic;

using Lidgren.Network;

namespace CoopServer
{
    class Util
    {
        public static NetConnection GetConnectionByUsername(string username)
        {
            long? userID = GetIdByUsername(username);
            if (userID == null || !Server.MainNetServer.Connections.Any(x => x.RemoteUniqueIdentifier == userID))
            {
                return null;
            }

            return Server.MainNetServer.Connections.First(x => x.RemoteUniqueIdentifier == userID);
        }

        public static long? GetIdByUsername(string username)
        {
            return Server.Players.Any(x => x.Value.Username == username) ? Server.Players.First(x => x.Value.Username == username).Key : null;
        }

        // Return a list of all connections but not the local connection
        public static List<NetConnection> FilterAllLocal(NetConnection local)
        {
            return new(Server.MainNetServer.Connections.Where(e => e != local));
        }
        public static List<NetConnection> FilterAllLocal(long local)
        {
            return new(Server.MainNetServer.Connections.Where(e => e.RemoteUniqueIdentifier != local));
        }

        // Return a list of players within range of ...
        public static List<NetConnection> GetAllInRange(LVector3 position, float range)
        {
            return new(Server.MainNetServer.Connections.FindAll(e => Server.Players[e.RemoteUniqueIdentifier].IsInRangeOf(position, range)));
        }
        // Return a list of players within range of ... but not the local one
        public static List<NetConnection> GetAllInRange(LVector3 position, float range, NetConnection local)
        {
            return new(Server.MainNetServer.Connections.Where(e => e != local && Server.Players[e.RemoteUniqueIdentifier].IsInRangeOf(position, range)));
        }

        public static T Read<T>(string file) where T : new()
        {
            XmlSerializer ser = new(typeof(T));

            string path = AppContext.BaseDirectory + file;
            T data;

            if (File.Exists(path))
            {
                using (FileStream stream = File.OpenRead(path))
                {
                    data = (T)ser.Deserialize(stream);
                }

                using (FileStream stream = new(path, File.Exists(path) ? FileMode.Truncate : FileMode.Create, FileAccess.ReadWrite))
                {
                    ser.Serialize(stream, data);
                }
            }
            else
            {
                using FileStream stream = File.OpenWrite(path);
                ser.Serialize(stream, data = new T());
            }

            return data;
        }
    }
}