package com.bernard.sboard.osc;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.time.Instant;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Timer;
import java.util.TimerTask;
import java.util.UUID;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import java.util.function.Supplier;

import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import com.bernard.sboard.SBoard;
import com.bernard.sboard.config.OscConfig;
import com.illposed.osc.OSCBadDataEvent;
import com.illposed.osc.OSCBundle;
import com.illposed.osc.OSCMessage;
import com.illposed.osc.OSCPacket;
import com.illposed.osc.OSCPacketDispatcher;
import com.illposed.osc.OSCPacketEvent;
import com.illposed.osc.OSCPacketListener;
import com.illposed.osc.transport.OSCPortIn;
import com.illposed.osc.transport.OSCPortInBuilder;
import com.illposed.osc.transport.OSCPortOut;
import com.illposed.osc.transport.OSCPortOutBuilder;

public class OscServer implements OSCPacketListener{
	
	Logger log = LogManager.getLogger(OscServer.class);
	
	SBoard sboard;
	
	OscConfig config;
	
	OSCPortIn inport;
	
	Map<Integer,OscRemoteController> controllers;
	
	Timer globalTimer;
	
	OSCPacketDispatcher opd;
	
	Timer oscDispacher;
	Lock oscLock;
	
	Map<OscRemoteController,Set<FrequentListener<?>>> frequentListeners;

	public OscServer(SBoard sboard, OscConfig config) {
		this.sboard = sboard;
		this.config = config;
		this.frequentListeners = new HashMap<>();
		this.controllers = new HashMap<>();
		this.oscLock = new ReentrantLock();
	}
	
	public void setup() throws IOException {
		
		oscDispacher = new Timer();
		inport = new OSCPortInBuilder()
			.setNetworkProtocol(config.networkProtocol)
			.setLocalPort(config.inputport)
			.setPacketListener(this)
			.build();
		
		inport.startListening();
		
		globalTimer = new Timer();
		globalTimer.scheduleAtFixedRate(new TimerTask() {
			@Override
			public void run() {
				updateFrequentListeners();
			}
		}, config.frequentUpdatePeriod, config.frequentUpdatePeriod);
	}
	
	@Override
	public void handlePacket(OSCPacketEvent event) {
		oscLock.lock();
		recursivePacketDispach(event.getPacket());
		oscLock.unlock();
	}



	@Override
	public void handleBadData(OSCBadDataEvent event) {
		log.warn("OSC Message not understood", event.getException());
	}
	private void dispachMessageToSBoard(OSCMessage message) {
		SOscMessage smessage = new SOscMessage(this, message);
		log.debug("Received OSC message: "+message.getAddress()+" "+message.getArguments());
		if(OscUtils.addrMatch(smessage.getContainer(0),"sboard") && OscUtils.addrMatch(smessage.getContainer(1),"osc")) {
			// Alors, le message nous est nous est destiné
			if(OscUtils.addrMatch(smessage.getContainer(1), "register")) {
				// REGISTER [ int int int int UUID, string Name, string IPAddr, int port ]
				UUID regUUID = new UUID(
						((int)smessage.getArguments().get(0))*0xFFFFL + ((int)smessage.getArguments().get(1)),
						((int)smessage.getArguments().get(2))*0xFFFFL + ((int)smessage.getArguments().get(3)));
				String name = (String)smessage.getArguments().get(4);
				SocketAddress address = new InetSocketAddress((String)smessage.getArguments().get(5), (int)smessage.getArguments().get(6));
				int newuid = 0;
				do {
					newuid = sboard.random.nextInt();
				} while (!controllers.containsKey(newuid));
				OSCPortOut opo;
				try {
					opo = new OSCPortOutBuilder()
							.setRemotePort((int)smessage.getArguments().get(6))
							.setRemoteSocketAddress(address)
							.setNetworkProtocol(config.networkProtocol)
							.build();
					OscRemoteController orc = new OscRemoteController(this, newuid, name, opo);
					OSCMessage answer = new OSCMessage("/sboard/osc/registered", List.of(
						(int)(regUUID.getLeastSignificantBits()>>32),
						(int)(regUUID.getLeastSignificantBits()&0xFFFF),
						(int)(regUUID.getMostSignificantBits()>>32),
						(int)(regUUID.getMostSignificantBits()&0xFFFF),
						newuid));
					controllers.put(newuid, orc);
					orc.send(answer);
				} catch (IOException e) {
					log.error("Could not register OSC reciever", e);
				}
			}
		} else {
			sboard.dispatchOscMessage(smessage);
		}
	}
	// Le synchronized permet de forcer les messages dans un même bundle à être executés sequentiellement.
	private void recursivePacketDispach(OSCPacket packet) {
		if(packet instanceof OSCMessage) {
			dispachMessageToSBoard((OSCMessage)packet);
		} else if (packet instanceof OSCBundle) {
			OSCBundle bundle = (OSCBundle) packet;
			if(!bundle.getTimestamp().isImmediate()) {
				Date dispachDate = bundle.getTimestamp().toDate(Date.from(Instant.now()));
				if(!dispachDate.before(Date.from(Instant.now()))) {
					oscDispacher.schedule(new TimerTask() {
						@Override
						public void run() {
							oscLock.lock();
							recursivePacketDispach(packet);
							oscLock.unlock();
						}
					}, dispachDate);
					return;
				}
			}
			// At this point, we should dispach the message immediatly
			for(OSCPacket oscp : bundle.getPackets()) 
				recursivePacketDispach(oscp);
		}
	}
	
	public OscRemoteController getSender(int uid) {
		return controllers.get(uid);
	}
	
	public void close() throws IOException{
		inport.close();
		for(OscRemoteController ctrl : controllers.values())
			ctrl.close();
	}
	
	/* Values Listeners */
	
	public <T> void declareFrequentUpdate(String address, Supplier<T> getter, OscRemoteController controller) {
		synchronized(frequentListeners) {
			frequentListeners.putIfAbsent(controller, new HashSet<>());
			frequentListeners.get(controller).add(new FrequentListener<>(address, getter, controller));
		}
	}
	public void removeRegularListen(String address, OscRemoteController controller) {
		synchronized(frequentListeners) {
			if(frequentListeners.containsKey(controller))
				frequentListeners.get(controller).removeIf(fl -> fl.address.equals(address));
		}
	}
	
	
	public void updateFrequentListeners() {
		synchronized(frequentListeners) {
			for(OscRemoteController ctrl : frequentListeners.keySet()) {
				OSCBundle bundle = new OSCBundle();
				for(FrequentListener<?> fl : frequentListeners.get(ctrl)) {
					OSCMessage toSend = new OSCMessage(fl.address,List.of(fl.getter.get()));
					bundle.addPacket(toSend);
				}
				ctrl.send(bundle);
			}
		}
	}
	
	protected class FrequentListener<T> {
		String address;
		Supplier<T> getter;
		OscRemoteController controller;
		public FrequentListener(String address, Supplier<T> getter, OscRemoteController controller) {
			this.address = address;
			this.getter = getter;
			this.controller = controller;
		}
		
	}
	
}