package com.github.theholywaffle.teamspeak3;

/*
 * #%L
 * TeamSpeak 3 Java API
 * %%
 * Copyright (C) 2014 Bert De Geyter
 * %%
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * #L%
 */

import com.github.theholywaffle.teamspeak3.api.Callback;
import com.github.theholywaffle.teamspeak3.api.exception.TS3ConnectionFailedException;
import com.github.theholywaffle.teamspeak3.api.reconnect.ConnectionHandler;
import com.github.theholywaffle.teamspeak3.commands.CQuit;
import com.github.theholywaffle.teamspeak3.commands.Command;
import com.github.theholywaffle.teamspeak3.log.LogHandler;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.Logger;

public class TS3Query {

        public enum FloodRate {
                DEFAULT(350),
                UNLIMITED(0);

                private final int ms;

                FloodRate(int ms) {
                        this.ms = ms;
                }

                public int getMs() {
                        return ms;
                }
        }

        public static final Logger log = Logger.getLogger(TS3Query.class.getName());

        private final ExecutorService userThreadPool = Executors.newCachedThreadPool();
        private final EventManager eventManager = new EventManager();
        private final TS3Config config;
        private final ConnectionHandler connectionHandler;

        private QueryIO io;
        private TS3Api api;
        private TS3ApiAsync asyncApi;

        /**
         * Creates a TS3Query that connects to a TS3 server at
         * {@code localhost:10011} using default settings.
         */
        public TS3Query() {
                this(new TS3Config());
        }

        /**
         * Creates a customized TS3Query that connects to a server
         * specified by {@code config}.
         *
         * @param config
         *              configuration for this TS3Query
         */
        public TS3Query(TS3Config config) {
                log.setUseParentHandlers(false);
                log.addHandler(new LogHandler(config.getDebugToFile()));
                log.setLevel(config.getDebugLevel());
                this.config = config;
                this.connectionHandler = config.getReconnectStrategy().create(config.getConnectionHandler());
        }

        // PUBLIC

        public TS3Query connect() {
                QueryIO oldIO = io;
                if (oldIO != null) {
                        oldIO.disconnect();
                }

                try {
                        io = new QueryIO(this, config);
                } catch (TS3ConnectionFailedException conFailed) {
                        fireDisconnect();
                        throw conFailed;
                }

                try {
                        connectionHandler.onConnect(this);
                } catch (Throwable t) {
                        log.log(Level.SEVERE, "ConnectionHandler threw exception in connect handler", t);
                }
                io.continueFrom(oldIO);

                return this;
        }

        /**
         * Removes and closes all used resources to the teamspeak server.
         */
        public void exit() {
                // Send a quit command synchronously
                // This will guarantee that all previously sent commands have been processed
                doCommand(new CQuit());

                io.disconnect();
                userThreadPool.shutdown();
                for (final Handler lh : log.getHandlers()) {
                        log.removeHandler(lh);
                }
        }

        public TS3Api getApi() {
                if (api == null) {
                        api = new TS3Api(this);
                }
                return api;
        }

        public TS3ApiAsync getAsyncApi() {
                if (asyncApi == null) {
                        asyncApi = new TS3ApiAsync(this);
                }
                return asyncApi;
        }

        // INTERNAL

        boolean doCommand(Command c) {
                final long end = System.currentTimeMillis() + config.getCommandTimeout();
                final Object signal = new Object();
                final Callback callback = new Callback() {
                        @Override
                        public void handle() {
                                synchronized (signal) {
                                        signal.notifyAll();
                                }
                        }
                };

                io.queueCommand(c, callback);

                boolean interrupted = false;
                while (!c.isAnswered() && System.currentTimeMillis() < end) {
                        try {
                                synchronized (signal) {
                                        signal.wait(end - System.currentTimeMillis());
                                }
                        } catch (final InterruptedException e) {
                                interrupted = true;
                        }
                }
                if (interrupted) {
                        // Restore the interrupt
                        Thread.currentThread().interrupt();
                }

                if (!c.isAnswered()) {
                        log.severe("Command " + c.getName() + " was not answered in time.");
                        return false;
                }

                return c.getError().isSuccessful();
        }

        void doCommandAsync(Command c) {
                doCommandAsync(c, null);
        }

        void doCommandAsync(Command c, Callback callback) {
                io.queueCommand(c, callback);
        }

        void submitUserTask(Runnable task) {
                userThreadPool.submit(task);
        }

        EventManager getEventManager() {
                return eventManager;
        }

        void fireDisconnect() {
                userThreadPool.submit(new Runnable() {
                        @Override
                        public void run() {
                                try {
                                        connectionHandler.onDisconnect(TS3Query.this);
                                } catch (Throwable t) {
                                        log.log(Level.SEVERE, "ConnectionHandler threw exception in disconnect handler", t);
                                }
                        }
                });
        }
}