package seng302;


import seng302.Model.Boat;
import seng302.Networking.BinaryMessageEncoder;
import seng302.Networking.MessageEncoders.RaceVisionByteEncoder;
import seng302.Networking.MessageEncoders.XMLMessageEncoder;
import seng302.Networking.Utils.BoatLocationMessage;
import seng302.Networking.Utils.MessageType;
import seng302.Networking.Utils.RaceStatus;
import seng302.Networking.Utils.XMLMessage;

import java.io.*;
import java.net.*;

import java.util.concurrent.ArrayBlockingQueue;

/**
 * TCP client to recive information from AC35 data source
 */
public class MockOutput implements Runnable
{
    private long lastHeartbeatTime;
    private RaceVisionByteEncoder messageEncoder = new RaceVisionByteEncoder();

    //socket port 5003 as 4940 is ac35 live port and 4941 is ac35 test port
    private ServerSocket serverSocket;
    private Socket mockSocket;
    private DataOutputStream outToVisualiser;

    //a buffer that contains items that are waiting to be sent
    private ArrayBlockingQueue<byte[]> messagesToSendBuffer = new ArrayBlockingQueue<>(99999999);

    private short messageNumber = 1;
    private short xmlSequenceNumber = 1;
    private int heartbeatSequenceNum = 1;
    private int boatLocationSequenceNumber = 1;
    private int raceStatusSequenceNumber = 1;
    private String raceXml;
    private String regattaXml;
    private String boatsXml;



    public MockOutput() throws  IOException {
        lastHeartbeatTime = System.currentTimeMillis();
        serverSocket = new ServerSocket(4945);
    }
    /**
     * calculates the time since last heartbeat
     * @return time since last heartbeat
     */
    private double timeSinceHeartbeat() {
        long now = System.currentTimeMillis();
        return (now - lastHeartbeatTime) / 1000.0;
    }

    //returns the heartbeat message
    private byte[] heartbeat(){
        byte[] heartbeatMessage = messageEncoder.heartBeat(heartbeatSequenceNum);
        heartbeatSequenceNum++;
        BinaryMessageEncoder binaryMessageEncoder = new BinaryMessageEncoder(MessageType.HEARTBEAT, System.currentTimeMillis(), messageNumber, (short)heartbeatMessage.length, heartbeatMessage);
        messageNumber++;
        return binaryMessageEncoder.getFullMessage();
    }

    /**
     * Used to give the mockOutput an xml string to be made into a message and sent
     * @param xmlString the xml string to send
     * @param messageType the kind of xml string, values given in AC35 spec (5 regatta, 6 race, 7 boat)
     */
    public synchronized void parseXMLString(String xmlString, int messageType){
        XMLMessageEncoder encoder = new XMLMessageEncoder(messageNumber, System.currentTimeMillis(), messageType, xmlSequenceNumber,(short) xmlString.length(), xmlString);
        //iterates the sequence numbers
        xmlSequenceNumber++;
        byte[] encodedXML = encoder.encode();

        BinaryMessageEncoder binaryMessageEncoder = new BinaryMessageEncoder(MessageType.XMLMESSAGE, System.currentTimeMillis(), messageNumber, (short)encodedXML.length, encodedXML);
        //iterates the message number
        messageNumber++;

        addMessageToBufferToSend(binaryMessageEncoder.getFullMessage());
    }

    /**
     * Used to give the mocOutput information about boat location to be made into a message and sent
     */
    public synchronized void parseBoatLocation(int sourceID, double lat, double lon){
        BoatLocationMessage boatLocationMessage = new BoatLocationMessage(sourceID, lat, lon, boatLocationSequenceNumber);
        //iterates the sequence number
        boatLocationSequenceNumber++;

        //encodeds the messages
        byte[] encodedBoatLoc = messageEncoder.boatLocation(boatLocationMessage);

        //encodeds the full message with header
        BinaryMessageEncoder binaryMessageEncoder = new BinaryMessageEncoder(MessageType.BOATLOCATION, System.currentTimeMillis(), messageNumber, (short)encodedBoatLoc.length,
                encodedBoatLoc);

        //iterates the message number
        messageNumber++;

        addMessageToBufferToSend(binaryMessageEncoder.getFullMessage());
    }


    public synchronized void parseRaceStatus(RaceStatus raceStatus){

        //iterates the sequence number
        raceStatusSequenceNumber++;

        //encodeds the messages
        byte[] encodedRaceStatus = messageEncoder.raceStatus(raceStatus);

        //encodeds the full message with header
        BinaryMessageEncoder binaryMessageEncoder = new BinaryMessageEncoder(MessageType.RACESTATUS, System.currentTimeMillis(), messageNumber, (short)encodedRaceStatus.length,
                encodedRaceStatus);

        //iterates the message number
        messageNumber++;

        addMessageToBufferToSend(binaryMessageEncoder.getFullMessage());

    }

    private synchronized void addMessageToBufferToSend(byte[] messagesToSendBuffer) {
        this.messagesToSendBuffer.add(messagesToSendBuffer);
    }

    public void run() {

        try {
            while (true){
                mockSocket = serverSocket.accept();
                outToVisualiser = new DataOutputStream(mockSocket.getOutputStream());

                /*******************************Test********************************/

                while(boatsXml == null || regattaXml == null || raceXml == null) {

                }

                parseXMLString(raceXml, XMLMessage.XMLTypeRace);
                parseXMLString(regattaXml, XMLMessage.XMLTypeRegatta);
                parseXMLString(boatsXml, XMLMessage.XMLTypeBoat);

                /*******************************Test********************************/

                while(true) {
                    try {
                        //sends a heartbeat every 5 seconds
                        if (timeSinceHeartbeat() >= 5.00) {
                            outToVisualiser.write(heartbeat());
                            lastHeartbeatTime = System.currentTimeMillis();
                        }

                        //checks the buffer to see if there is anything to send
                        if (messagesToSendBuffer.size() > 0) {
                            for (byte[] binaryMessage : messagesToSendBuffer) {
                                //sends the message to the visualiser
                                outToVisualiser.write(binaryMessage);
                            }
                            //cleans out buffer
                            messagesToSendBuffer.clear();
                        }
                    }catch(SocketException e){
                        break;
                    }

                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }



    public void setRaceXml(String raceXml) {
        this.raceXml = raceXml;
    }


    public void setRegattaXml(String regattaXml) {
        this.regattaXml = regattaXml;
    }


    public void setBoatsXml(String boatsXml) {
        this.boatsXml = boatsXml;
    }

    public static void main(String argv[]) throws Exception
    {
        MockOutput client = new MockOutput();
        client.run();
    }

}