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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.process;

import java.util.ArrayList;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.viaoa.concurrent.OAExecutorService;
import com.viaoa.util.OADateTime;

/**
 * Used to manage OACron jobs, and uses OAExecutorService when it is time to process the cron. 
 * @author vvia
 */
public class OACronProcessor {
    private static Logger LOG = Logger.getLogger(OACronProcessor.class.getName());

    private final OAExecutorService execService;
    private CopyOnWriteArrayList alCron;

    private Thread thread;
    private final Object lock = new Object();
    private final AtomicInteger aiStartStop = new AtomicInteger();
    private final AtomicInteger aiThreadId = new AtomicInteger();
    
    public OACronProcessor() {
        execService = new OAExecutorService();
        alCron = new CopyOnWriteArrayList();
    }
    
    public OACron[] getCrons() {
        return (OACron[]) alCron.toArray(new OACron[0]);
    }

    public void add(OACron cron) {
        LOG.fine("cron="+cron.getName()+", "+cron.getDescription());
        if (!alCron.contains(cron)) {
            alCron.add(cron);
            synchronized (lock) {
                lock.notifyAll();
            }
        }
    }
    public void remove(OACron cron) {
        LOG.fine("cron="+cron.getName()+", "+cron.getDescription());
        alCron.remove(cron);
    }

    public boolean isRunning() {
        return (thread != null);
    }
    
    public void start() {
        aiStartStop.incrementAndGet();

        synchronized (lock) {
            lock.notifyAll();
        }

        LOG.fine("start called, aiStartStop=" + aiStartStop);
        thread = new Thread() {
            @Override
            public void run() {
                runThread();
            }
        };
        thread.setName("OACronProcessor." + aiThreadId.incrementAndGet());
        thread.setDaemon(true);
        thread.start();
    }

    public void stop() {
        aiStartStop.incrementAndGet();

        synchronized (lock) {
            lock.notifyAll();
            thread = null;
        }
        LOG.fine("stop called, aiStartStop=" + aiStartStop);
    }

    /*
     * called by {@link #runProcessInAnotherThread(OACron, boolean)} using an execService thread.
     */
    protected void callProcess(final OACron cron, boolean bManuallyCalled) {
        if (cron == null) return;
        cron.setLast(new OADateTime());
        LOG.fine("processing cron, name = "+cron.getName()+", description="+cron.getDescription());
        cron.process(bManuallyCalled);
    }

    
    /*
     * will use execService to then call {@link #process(OACron,boolean)}
     */
    public void callProcessInAnotherThread(final OACron cron, final boolean bManuallyCalled) {
        if (cron == null) return;
        execService.submit(new Runnable() {
            @Override
            public void run() {
                OACronProcessor.this.callProcess(cron, bManuallyCalled);
            }
        });
    }
    
    protected void runThread() {
        final int iStartStop = aiStartStop.get();
        LOG.fine("created cron processor, cntStartStop=" + iStartStop + ", thread name=" + Thread.currentThread().getName());
        
        OADateTime dtLast = null;
        final ArrayList alLast = new ArrayList<>();
                
        
        for (;;) {
            try {
                if (iStartStop != aiStartStop.get()) break;
                
                OADateTime dtNow = new OADateTime();
                dtNow.clearSecondAndMilliSecond();
                
                OADateTime dtCompare = dtNow.addMinutes(-1);
                dtCompare.clearSecondAndMilliSecond();

                if (dtLast == null || dtLast.before(dtCompare)) {
                    alLast.clear();
                }
                dtLast = dtCompare;
                
                beforeProcess(dtNow);
                for (OACron cron : alCron) {
                    if (!cron.getEnabled()) continue;
                    if (alLast.contains(cron)) {
                        continue;
                    }
                    alLast.add(cron);

                    OADateTime dt = new OADateTime(cron.findNext(dtCompare));
                    dt.clearSecondAndMilliSecond();
                    
                    int d = dt.compareTo(dtNow);
                    if (d == 0) {
                        callProcessInAnotherThread(cron, false);
                    }
                }
                
                synchronized (lock) {
                    lock.wait(30 * 1000);
                }
            }
            catch (Exception e) {
                LOG.log(Level.WARNING, "error processing from queue", e);
            }
        }
        LOG.fine("stopped OACronProcessor thread, cntStartStop=" + iStartStop + ", thread name=" + Thread.currentThread().getName());
    }
    
    protected void beforeProcess(OADateTime dtNow) {
    }
}