using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Threading;
using System.Windows.Threading;
using System.Collections.ObjectModel;
using System.Collections;
using System.Data;
using System.Net.Sockets;
using System.Net;
using System.Windows.Media.Media3D;
using System.Text.Json;
using System.Security.Claims;

namespace WpfBlockChanApp
{
    public partial class MainWindow : Window
    {
        
        DispatcherTimer timer1s;
        DispatcherTimer timer1m;

        ObservableCollection<Block> observableBlockChain = new ObservableCollection<Block>();
        ObservableCollection<int> observableString = new ObservableCollection<int>();
        //static List<string> strings = new List<string>();
        static List<int> clients = new List<int>();

        const string STD_IP = "127.0.0.1";
        static string data;
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
            ChainView.ItemsSource = observableBlockChain;
            LogView.ItemsSource = observableString;

            timer1s = new DispatcherTimer();
            timer1s.Interval = TimeSpan.FromSeconds(1);
            timer1s.Tick += UpdateData;
            timer1s.Start();

            timer1m = new DispatcherTimer();
            timer1m.Interval = TimeSpan.FromSeconds(30);
            timer1m.Tick += Timer1m_Tick;
            timer1m.Start();



            tcpListener = new TcpListener(IPAddress.Parse(STD_IP), 0);
            tcpListener.Start();
            data = ((IPEndPoint)tcpListener.LocalEndpoint).Port.ToString();
            MyPort.Content = data;

            Blockchain.Chain = new List<Block>();
            Blockchain.Compute = true;
            Block tmpBlock = new Block(0, "", "", 0, 0);
            tmpBlock.Hash = "";
            Blockchain.Chain.Add(tmpBlock);

            stopNetwork = false;
            listenThread = new Thread(() => listenerThredFunction());
            listenThread.Start();
        }

        private void Timer1m_Tick(object? sender, EventArgs e)
        {
            UpdateClients();
        }
        void UpdateData(object? sender, EventArgs e)
        {
            for (int i = observableBlockChain.Count; i < Blockchain.Chain.Count; i++)
                observableBlockChain.Add(Blockchain.Chain[i]);

            for (int i = observableString.Count; i < clients.Count; i++)
                observableString.Add(clients[i]);
        }



        Thread calcualteBlockThread;
        static bool stopNetwork = false;
        static bool stopMiner = false;
        static void ComputeBlockThreadFunction()
        {
            while (true)
            {
                if (stopMiner) break;
                Blockchain.Compute = true;
                ReturnOption option = Blockchain.ComputeBlock(data);

                if (!option.isValid) { continue; }

                if (Blockchain.AddBlock(option.value))
                {
                    UpdateClients(option.value);
                    //UpdateClients();
                }
            }
        }

        static TcpListener tcpListener;
        Thread listenThread;

        static void listenerThredFunction()
        {
            while (true)
            {
                if (stopNetwork) break;
                listen();
            }
        }
        static void listen()
        {
            try
            {
                using TcpClient tcpClient = tcpListener.AcceptTcpClient();
                using NetworkStream networkStream = tcpClient.GetStream();

                byte[] buffer = new byte[4];
                int readByts = networkStream.Read(buffer, 0, buffer.Length);
                if (readByts <= 0) return;
                int sizeOfStruct = BitConverter.ToInt32(buffer);

                byte[] isListBuffer = new byte[1];
                readByts = networkStream.Read(isListBuffer, 0, isListBuffer.Length);
                if(readByts <= 0) return;
                bool isList = BitConverter.ToBoolean(isListBuffer);

                byte[] data = new byte[sizeOfStruct];
                int messageSize = networkStream.Read(data, 0, data.Length);
                if (messageSize <= 0) return;
                
                string messageString = Encoding.UTF8.GetString(data, 0, messageSize);

                if (isList)
                {
                    List<Block> chain = JsonSerializer.Deserialize<List<Block>>(messageString);
                    if (!Blockchain.IsValid(chain)) return;
                    bool update = Blockchain.Evaluete(chain, Blockchain.Chain);
                    if (update)
                    {
                        Blockchain.Chain = chain;
                        Blockchain.Compute = false;
                        UpdateClients();
                    }
                }
                else
                {
                    Block block = JsonSerializer.Deserialize<Block>(messageString);
                    if (Blockchain.AddBlock(block))
                    {
                        Blockchain.Compute = false;
                        UpdateClients(block);
                    }
                }
            }
            catch (Exception e)
            {

            }

        }
        static void UpdateClients()
        {
            string chainString = JsonSerializer.Serialize(Blockchain.Chain);

            foreach (var clien in clients)
            {
                UpdateClient(clien, chainString, true);
            }
        }

        static void UpdateClients(Block block)
        {
            string blockString = JsonSerializer.Serialize(block);

            foreach (var clien in clients)
            {
                UpdateClient(clien, blockString, false);
            }
        }
       
        static void UpdateClient(int port, string data, bool isListBool)
        {
            try
            {
                using TcpClient tcpClient = new TcpClient();
                tcpClient.Connect(IPAddress.Parse(STD_IP), port);
                using NetworkStream networkStream = tcpClient.GetStream();

              
                byte[] dataBytes = Encoding.UTF8.GetBytes(data);
                byte[] isList = BitConverter.GetBytes(isListBool);
                byte[] size = BitConverter.GetBytes(dataBytes.Length);
                
                networkStream.Write(size, 0, size.Length);
                networkStream.Write(isList, 0, isList.Length);
                networkStream.Write(dataBytes, 0, dataBytes.Length);
                
               
            }catch(Exception e)
            {

            }
            

        }
        private void Start_Click(object sender, RoutedEventArgs e)
        {
            Blockchain.Compute = true;
            stopMiner = false;
            calcualteBlockThread = new Thread(() => ComputeBlockThreadFunction());
            calcualteBlockThread.Start();
        }
        private void Stop_Click(object sender, RoutedEventArgs e)
        {
            
            Blockchain.Compute = false;
            stopMiner = true;
        }
        private void Connect_Click(object sender, RoutedEventArgs e)
        {
            int i = 0;
            if(int.TryParse(ConnectBox.Text, out i))
            {
                clients.Add(i);
                ConnectBox.Text = "";
            }
        }
        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            stopNetwork = true;
            stopMiner = true;
            tcpListener.Stop();
            Blockchain.Compute = false;
        }
    }
}