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/*  Copyright 1999 Vince Via [email protected]
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/
package com.viaoa.concurrent;

import java.util.concurrent.Callable;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;

import com.viaoa.util.OADateTime;
import com.viaoa.util.OATime;


/**
 * ExecutorService that will run methods at a specific date/time.
 * @author vvia
 *
 */
public class OAScheduledExecutorService {
    private static Logger LOG = Logger.getLogger(OAScheduledExecutorService.class.getName());
    private ScheduledExecutorService scheduledExecutorService;
    private final AtomicInteger aiTotalSubmitted = new AtomicInteger();
    
    public OAScheduledExecutorService() {
        getScheduledExecutorService();
    }

    public ScheduledFuture schedule(Runnable r, OADateTime dt) throws Exception {
        aiTotalSubmitted.incrementAndGet();
        
        long ms;
        OADateTime dtNow = new OADateTime();
        if (dt == null || dt.before(dtNow)) ms = 0;
        else ms = dt.betweenMilliSeconds(dtNow);
        
        ScheduledFuture f = getScheduledExecutorService().schedule(r, ms, TimeUnit.MILLISECONDS);
        return f;
    }
    
    
    public ScheduledFuture schedule(Runnable r, int delay, TimeUnit tu) throws Exception {
        aiTotalSubmitted.incrementAndGet();
        ScheduledFuture f = getScheduledExecutorService().schedule(r, delay, tu);
        return f;
    }
    public ScheduledFuture schedule(Callable c, int delay, TimeUnit tu) throws Exception {
        aiTotalSubmitted.incrementAndGet();
        ScheduledFuture f = getScheduledExecutorService().schedule(c, delay, tu);
        return f;
    }


    public ScheduledFuture scheduleEvery(Runnable r, OATime time) throws Exception {
        aiTotalSubmitted.incrementAndGet();
        
        final long secDay = (24 * 60 * 60);
        long secDelay;
        OATime tNow = new OATime();
        if (tNow.before(time)) secDelay = time.betweenSeconds(tNow);
        else {
            secDelay = tNow.betweenSeconds(time);
            secDelay = secDay - secDelay;
        }
        TimeUnit tu = TimeUnit.SECONDS;
        ScheduledFuture f = getScheduledExecutorService().scheduleAtFixedRate(r, secDelay, secDay, tu);
        return f;
    }
    public ScheduledFuture scheduleEvery(Runnable r, int initialDelay, int period, TimeUnit tu) throws Exception {
        aiTotalSubmitted.incrementAndGet();
        ScheduledFuture f = getScheduledExecutorService().scheduleWithFixedDelay(r, initialDelay, period, tu);
        return f;
    }
    
    public ScheduledExecutorService getScheduledExecutorService() {
        if (scheduledExecutorService != null) return scheduledExecutorService;
        ThreadFactory tf = new ThreadFactory() {
            AtomicInteger ai = new AtomicInteger();
            @Override
            public Thread newThread(Runnable r) {
                Thread t = new Thread(r);
                t.setName("OAScheduledExecutorService.thread"+ai.getAndIncrement());
                t.setDaemon(true);
                t.setPriority(Thread.NORM_PRIORITY);
                return t;
            }
        };
        scheduledExecutorService = Executors.newScheduledThreadPool(1, tf);  // core needs to be > 0
        return scheduledExecutorService;
    }
    
    
    
    
    public static void main(String[] args) throws Exception {
        OAScheduledExecutorService ses = new OAScheduledExecutorService();
        final AtomicInteger ai = new AtomicInteger();
        Runnable r = new Runnable() {
            @Override
            public void run() {
                ai.incrementAndGet();
                System.out.println("====> "+ai);
                try {
//                    Thread.sleep(900);
                }
                catch (Exception e) {
                    // TODO: handle exception
                }
            }
        };
        ses.scheduleEvery(r, 1, 1, TimeUnit.MILLISECONDS);
        ses.scheduleEvery(r, 5, 2, TimeUnit.SECONDS);
        ses.scheduleEvery(r, 1, 1, TimeUnit.SECONDS);
        ses.scheduleEvery(r, 1, 1, TimeUnit.MILLISECONDS);
        ses.scheduleEvery(r, 1, 1, TimeUnit.SECONDS);
        
        
        /*        
                ThreadFactory tf = new ThreadFactory() {
                    AtomicInteger ai = new AtomicInteger();
                    @Override
                    public Thread newThread(Runnable r) {
                        Thread t = new Thread(r);
                        t.setName("ScheduledExecutorService.thread"+ai.getAndIncrement());
                        t.setDaemon(true);
                        t.setPriority(Thread.NORM_PRIORITY);
        System.out.println("NEW THREAD ====> "+ai);
                        return t;
                    }
                };
                ScheduledExecutorService scheduledExecutorService = Executors.newScheduledThreadPool(1, tf);
                
                ScheduledFuture f = scheduledExecutorService.scheduleAtFixedRate(r, 1, 5, TimeUnit.SECONDS);
        
                ScheduledFuture fx = scheduledExecutorService.scheduleAtFixedRate(r, 100, 200, TimeUnit.MILLISECONDS);
        */        
        for (;;) {
            Thread.sleep(10 * 1000);
        }
    }
    
}