package mock.app;

import network.Messages.Enums.XMLMessageType;
import network.Messages.LatestMessages;
import network.Messages.XMLMessage;
import org.mockito.Mock;
import visualiser.gameController.ControllerServer;

import java.io.DataOutputStream;
import java.io.IOException;
import java.lang.reflect.Array;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;

/**
 * Connection acceptor for multiple clients
 */
public class ConnectionAcceptor implements Runnable {


    /**
     * Port to expose server on.
     */
    private int serverPort = 4942;
    /**
     * Socket used to listen for clients on.
     */
    private ServerSocket serverSocket;
    //mock outputs
    private ArrayBlockingQueue<MockOutput> mockOutputList = new ArrayBlockingQueue<>(16, true);
    //latest messages
    private LatestMessages latestMessages;
    //Acknowledgement number for packets
    private int ackNumber = 0;
    //race xml sequence number
    private short raceXMLSequenceNumber;
    //boat xml sequence number
    private short boatXMLSequenceNumber;
    //regatta xml sequence number
    private short regattaXMLSequenceNumber;

    /**
     * Connection Acceptor Constructor
     * @param latestMessages Latest messages to be sent
     * @throws IOException if a server socket cannot be instantiated.
     */
    public ConnectionAcceptor(LatestMessages latestMessages) throws IOException {

        this.latestMessages =latestMessages;
        this.serverSocket = new ServerSocket(serverPort);
        CheckClientConnection checkClientConnection = new CheckClientConnection(mockOutputList);
        new Thread(checkClientConnection).start();
    }

    public String getAddress() throws UnknownHostException {
        return InetAddress.getLocalHost().getHostAddress();
    }

    public int getServerPort() {
        return serverPort;
    }

    /**
     * Run the Acceptor
     */
    @Override
    public void run() {
        while(true){//should be connections not filled up
            try {
                System.out.println("Waiting for a connection...");//TEMP DEBUG REMOVE
                Socket mockSocket = serverSocket.accept();
                DataOutputStream outToVisualiser = new DataOutputStream(mockSocket.getOutputStream());
                MockOutput mockOutput = new MockOutput(latestMessages, outToVisualiser);
                ControllerServer controllerServer = new ControllerServer(mockSocket);
                new Thread(mockOutput).start();
                new Thread(controllerServer).start();
                mockOutputList.add(mockOutput);
                System.out.println(String.format("%d number of Visualisers Connected.", mockOutputList.size()));
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

    /**
     * Nested class to remove disconnected clients
     */
    class CheckClientConnection implements Runnable{

        private ArrayBlockingQueue<MockOutput> mocks;

        /**
         * Constructor
         * @param mocks Mocks "connected"
         */
        public CheckClientConnection(ArrayBlockingQueue<MockOutput> mocks){
            this.mocks = mocks;
        }

        /**
         * Run the remover.
         */
        @Override
        public void run() {
            double timeSinceLastHeartBeat = System.currentTimeMillis();
            while(true) {
                //System.out.println(mocks.size());//used to see current amount of visualisers connected.
                ArrayBlockingQueue<MockOutput> m = new ArrayBlockingQueue(16, true, mocks);
                for (MockOutput mo : m) {
                    try {
                        mo.sendHeartBeat();
                    } catch (IOException e) {
                        mocks.remove(mo);
                    }
                }
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    
    /**
     * Sets the Race XML to send.
     * @param raceXml XML to send to the Client.
     */
    public void setRaceXml(String raceXml) {
        //Create the message.
        XMLMessage message = this.createXMLMessage(raceXml, XMLMessageType.RACE);

        //Place it in LatestMessages.
        this.latestMessages.setRaceXMLMessage(message);
    }

    /**
     * Sets the Regatta XMl to send.
     * @param regattaXml XML to send to Client.
     */
    public void setRegattaXml(String regattaXml) {
        //Create the message.
        XMLMessage message = this.createXMLMessage(regattaXml, XMLMessageType.REGATTA);

        //Place it in LatestMessages.
        this.latestMessages.setRegattaXMLMessage(message);
    }

    /**
     * Sets the Boats XML to send.
     * @param boatsXml XMl to send to the Client.
     */
    public void setBoatsXml(String boatsXml) {
        //Create the message.
        XMLMessage message = this.createXMLMessage(boatsXml, XMLMessageType.BOAT);

        //Place it in LatestMessages.
        this.latestMessages.setBoatXMLMessage(message);
    }

    /**
     * Creates an XMLMessage of a specified subtype using the xml contents string.
     * @param xmlString The contents of the xml file.
     * @param messageType The subtype of xml message (race, regatta, boat).
     * @return The created XMLMessage object.
     */
    private XMLMessage createXMLMessage(String xmlString, XMLMessageType messageType) {

        //Get the correct sequence number to use, and increment it.
        short sequenceNumber = 0;
        if (messageType == XMLMessageType.RACE) {
            sequenceNumber = this.raceXMLSequenceNumber;
            this.raceXMLSequenceNumber++;

        } else if (messageType == XMLMessageType.BOAT) {
            sequenceNumber = this.boatXMLSequenceNumber;
            this.boatXMLSequenceNumber++;

        } else if (messageType == XMLMessageType.REGATTA) {
            sequenceNumber = this.regattaXMLSequenceNumber;
            this.regattaXMLSequenceNumber++;

        }

        //Create the message.
        XMLMessage message = new XMLMessage(
                XMLMessage.currentVersionNumber,
                getNextAckNumber(),
                System.currentTimeMillis(),
                messageType,
                sequenceNumber,
                xmlString);


        return message;
    }

    /**
     * Increments the ackNumber value, and returns it.
     * @return Incremented ackNumber.
     */
    private int getNextAckNumber(){
        this.ackNumber++;

        return this.ackNumber;
    }

}