using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.IO;
using System.Diagnostics;
using System.Net;
using Newtonsoft.Json;
using System.Text.RegularExpressions;

namespace RageCoop.Core
{
    internal class ZeroTierNetwork
    {
        public ZeroTierNetwork(string line)
        {
            // <nwid> <name> <mac> <status> <type> <dev> <ZT assigned ips>
            var v = Regex.Split(line," ").Skip(2).ToArray();
            ID=v[0];
            Name=v[1];
            Mac=v[2];
            Status=v[3];
            Type=v[4];
            Device=v[5];
            foreach (var i in v[6].Split(','))
            {
                Addresses.Add(i.Split('/')[0]);
            }
        }
        public string ID;
        public string Name;
        public string Mac;
        public string Status;
        public string Type;
        public string Device;
        public List<string> Addresses=new List<string>();

    }
    internal static class ZeroTierHelper
    {
        private static readonly string _path="zerotier-cli";
        private static readonly string _arg = "";
        static ZeroTierHelper()
        {
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
            {
                var batpath= Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86), "ZeroTier", "One", "zerotier-cli.bat");
                _arg=$"/c \"{batpath}\" ";
                _path="cmd.exe";
            }
            var status = RunCommand("status");
            if (!status.StartsWith("200"))
            {
                throw new Exception("ZeroTier not ready: "+status);
            }
        }
        public static ZeroTierNetwork Join(string networkId, bool waitIpAssign=true)
        {
            var p = Run("join "+networkId);
            var o = p.StandardOutput.ReadToEnd();
            if (!o.StartsWith("200 join OK"))
            {
                throw new Exception(o+p.StandardError.ReadToEnd());
            }
            if (!waitIpAssign) { return ListNetworks()[networkId]; }
            while (true)
            {
                if(ListNetworks().TryGetValue(networkId,out var n))
                {
                    if (n.Addresses.Count!=0 && (!n.Addresses.Where(x=>x=="-").Any()))
                    {
                        return n;
                    }
                    System.Threading.Thread.Sleep(100);
                }
                else
                {
                    break;
                }
            }
            return null;
        }
        public static void Leave(string networkId)
        {
            var p = Run("leave "+networkId);
            var o = p.StandardOutput.ReadToEnd();
            if (!o.StartsWith("200 leave OK"))
            {
                throw new Exception(o+p.StandardError.ReadToEnd());
            }
        }
        public static Dictionary<string, ZeroTierNetwork> ListNetworks()
        {
            Dictionary<string, ZeroTierNetwork> networks=new Dictionary<string, ZeroTierNetwork>();
            var p = Run("listnetworks");
            var lines=Regex.Split(p.StandardOutput.ReadToEnd(),"\n").Skip(1);

            foreach (var line in lines)
            {
                var l=line.Replace("\r","");
                if (!string.IsNullOrWhiteSpace(l))
                {
                    var n = new ZeroTierNetwork(l);
                    networks.Add(n.ID,n);
                }
            }
            return networks;
        }
        private static Process Run(string args)
        {
            var p = new Process();
            p.StartInfo=new ProcessStartInfo()
            {
                FileName = _path,
                Arguments =_arg+args,
                UseShellExecute = false,
                RedirectStandardOutput = true,
                RedirectStandardError = true,
            };
            p.Start();
            p.WaitForExit();
            return p;
        }
        private static string RunCommand(string command)
        {
            var p = Run(command);
            return p.StandardOutput.ReadToEnd()+p.StandardError.ReadToEnd();
        }
    }
}