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


package engine.net;

import engine.mbEnums.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;

// MB Dev Notes:
// All outgoing Protocol messages to the player are managed through the MessageDispatcher.class.
// All incoming Protocol messages from the player are managed by the Protocol.class.
//
// A DispatchMessage is configured (Protocol messsage) and wrapped in a Dispatch (distribution list).
// A Dispatch can be submitted to the MessageDispatcher for delivery from any thread.
//
// Dispatches are interleaved between channels.  This is to ensure
// a combat or movement message is not delayed by spam clicking a
// larger message.  Choose your channel wisely.

public class MessageDispatcher implements Runnable {

    // Class variables

    private static final ConcurrentLinkedQueue<Dispatch>[] _messageQueue = new ConcurrentLinkedQueue[DispatchChannel.values().length];
    private static final LinkedBlockingQueue<Boolean> _blockingQueue = new LinkedBlockingQueue<>();
    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;

    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!");

    }

    @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);
            }

        }
    }

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

        // Use Dispatch.borrow() for a new dispatch.
        // The Dispatch will be released by the system
        // once delivered.

        // 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;
        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;
    }

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