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//      Magicbane Emulator Project © 2013 - 2022
//                www.magicbane.com


package engine.net;

import engine.Enum.DispatchChannel;
import org.pmw.tinylog.Logger;

import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.LongAdder;
import java.util.regex.Pattern;

/**
 * Thread blocks until MagicBane dispatch messages are
 * enqueued then processes them in FIFO order. The collection
 * is thread safe.
 * <p>
 * Any large messages not time sensitive such as load object
 * sent to more than a single individual should be spawned
 * individually on a DispatchMessageThread.
 */

public class MessageDispatcher implements Runnable {

    // Instance variables

    @SuppressWarnings("unchecked") // Cannot have arrays of generics in java.
    private static final ConcurrentLinkedQueue<Dispatch>[] _messageQueue = new ConcurrentLinkedQueue[DispatchChannel.values().length];
    private static final LinkedBlockingQueue<Boolean> _blockingQueue = new LinkedBlockingQueue<>();

    // Class variables
    public static volatile long[] messageCount = new long[DispatchChannel.values().length];
    public static LongAdder[] dispatchCount = new LongAdder[DispatchChannel.values().length];

    // Performance metrics
    public static volatile long[] maxRecipients = new long[DispatchChannel.values().length];
    public static LongAdder itemPoolSize = new LongAdder();
    private final Pattern filterPattern; // Unused, but just in case
    private Dispatch messageDispatch;

    // Thread constructor

    public MessageDispatcher() {

        // Create new FIFO queues for this network thread

        for (DispatchChannel dispatchChannel : DispatchChannel.values()) {
            _messageQueue[dispatchChannel.getChannelID()] = new ConcurrentLinkedQueue<>();
            dispatchCount[dispatchChannel.getChannelID()] = new LongAdder();
        }

        filterPattern = Pattern.compile("[^\\p{ASCII}]");
        Logger.info(" Dispatcher thread has started!");

    }

    public static void send(Dispatch messageDispatch, DispatchChannel dispatchChannel) {

        // Don't queue up empty dispatches!

        if (messageDispatch.player == null)
            return;

        _messageQueue[dispatchChannel.getChannelID()].add(messageDispatch);
        _blockingQueue.add(true);

        // Update performance metrics

        messageCount[dispatchChannel.getChannelID()]++;

    }

    public static String getNetstatString() {

        String outString = null;
        String newLine = System.getProperty("line.separator");
        outString = "[LUA_NETSTA()]" + newLine;
        outString += "poolSize: " + itemPoolSize.longValue() + '\n';

        for (DispatchChannel dispatchChannel : DispatchChannel.values()) {

            outString += "Channel: " + dispatchChannel.name() + '\n';
            outString += "Dispatches: " + dispatchCount[dispatchChannel.getChannelID()].longValue() + '\n';
            outString += "Messages: " + messageCount[dispatchChannel.getChannelID()] + '\n';
            outString += "maxRecipients: " + maxRecipients[dispatchChannel.getChannelID()] + '\n';
        }
        return outString;
    }

    @Override
    public void run() {

        boolean shouldBlock;

        while (true) {
            try {

                shouldBlock = true;

                for (DispatchChannel dispatchChannel : DispatchChannel.values()) {

                    this.messageDispatch = _messageQueue[dispatchChannel.getChannelID()].poll();

                    if (this.messageDispatch != null) {
                        DispatchMessage.serializeDispatch(this.messageDispatch);
                        shouldBlock = false;
                    }

                }

                if (shouldBlock == true)
                    shouldBlock = _blockingQueue.take();

            } catch (Exception e) {
                Logger.error(e);
            }

        }
    }

    // For Debugging:
    //Logger.error("MessageDispatcher", messageDispatch.msg.getOpcodeAsString() + " sent to " + messageDispatch.playerList.size() + " players");
}