package seng302.Networking;
import seng302.Networking.MessageEncoders.RaceVisionByteEncoder;
import seng302.Networking.MessageEncoders.XMLMessageEncoder;
import seng302.Networking.Utils.BoatLocationMessage;
import seng302.Networking.Utils.MessageType;

import java.io.*;
import java.net.*;
import java.util.ArrayList;

/**
 * TCP client to recive information from AC35 data source
 */
public class MockOutput
{
    private long lastHeartbeatTime;

    private RaceVisionByteEncoder messageEncoder = new RaceVisionByteEncoder();

    //socket port 4942 as 4940 is ac35 live port and 4941 is ac35 test port
    private Socket mockSocket;
    private DataOutputStream outToVisualiser;

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

    private short messageNumber = 1;

    private short xmlSequenceNumber = 1;
    private int heartbeatSequenceNum = 1;



    public MockOutput() throws  IOException{
        /*******************************Test********************************/
        StringBuilder xmlString;

        BufferedReader br = new BufferedReader(new InputStreamReader(
                this.getClass().getResourceAsStream(("/raceXML/Regatta.xml"))));

        String line;
        xmlString = new StringBuilder();
        while((line=br.readLine())!= null){
            xmlString.append(line.trim());
        }

        parseXMLString(xmlString.toString(), 5);

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

        /**************sockets*******************/
        //start Time
        lastHeartbeatTime = System.currentTimeMillis();


        mockSocket = new Socket("localhost", 4942);
        outToVisualiser = new DataOutputStream(mockSocket.getOutputStream());


        //loop that sends
        while(true)
        {
            //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();
            }
        }
        /**************sockets*******************/
    }

    /**
     * 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++;
        BinaryMesageEncoder binaryMesageEncoder = new BinaryMesageEncoder(MessageType.HEARTBEAT, System.currentTimeMillis(), messageNumber, (short)heartbeatMessage.length, heartbeatMessage);
        messageNumber++;
        return binaryMesageEncoder.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 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();

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

        addMessageToBufferToSend(binaryMesageEncoder.getFullMessage());
    }

    /**
     * Used to give the mocOutput information about boat location to be made into a message and sent
     */
    public void parseBoatLocation(){
        /// TODO: 26/04/17
    }

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

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

}