package org.jgroups.blocks;

import org.jgroups.*;
import org.jgroups.util.RspList;
import org.jgroups.util.Util;
import org.testng.Assert;
import org.testng.annotations.AfterMethod;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.BeforeMethod;
import org.testng.annotations.Test;

import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Vector;

/**
 * @author Bela Ban
 */
@Test(groups=Global.FUNCTIONAL,sequential=true)
public class GroupRequestTest {
    Address a1, a2, a3;
    Vector<Address> dests=null;

    @BeforeClass
    void init() throws UnknownHostException {
        a1=Util.createRandomAddress();
        a2=Util.createRandomAddress();
        a3=Util.createRandomAddress();
    }

    @BeforeMethod
    protected void setUp() throws Exception {
        dests=new Vector<Address>(Arrays.asList(a1, a2));
        dests.add(a1);
        dests.add(a2);
    }

    @AfterMethod
    protected void tearDown() throws Exception {
        dests.clear();
    }

    @Test(groups=Global.FUNCTIONAL)
    public void testMessageTimeout() throws Exception {
        _testMessageTimeout(true);
    }

    @Test(groups=Global.FUNCTIONAL)
    public void testMessageReception() throws Exception {
        _testMessageReception(true);
        _testMessageReception(false);
    }


    @Test(groups=Global.FUNCTIONAL)
    public void testMessageReceptionWithSuspect() throws Exception {
        _testMessageReceptionWithSuspect(true);
        _testMessageReceptionWithSuspect(false);
    }


    @Test(groups=Global.FUNCTIONAL)
    public void testMessageReceptionWithViewChange() throws Exception {
        _testMessageReceptionWithViewChange(true);
        _testMessageReceptionWithViewChange(false);
    }

    @Test(groups=Global.FUNCTIONAL)
    public void testMessageReceptionWithViewChangeMemberLeft() throws Exception {
        _testMessageReceptionWithViewChangeMemberLeft(true);
        _testMessageReceptionWithViewChangeMemberLeft(false);
    }


    @Test(groups=Global.FUNCTIONAL)
    public void testGetFirstWithResponseFilter() throws Exception {
        Object[] responses=new Message[]{new Message(null, a1, new Long(1)),
                new Message(null, a2, new Long(2)),
                new Message(null, a3, new Long(3))};
        MyTransport transport=new MyDelayedTransport(true, responses, 500);
        dests.add(a3);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_FIRST, 0));
        req.setResponseFilter(new RspFilter() {
            int num_rsps=0;

            public boolean isAcceptable(Object response, Address sender) {
                boolean retval=response instanceof Long && ((Long)response).longValue() == 2L;
                System.out.println("-- received " + response + " from " + sender + ": " + (retval? "OK" : "NOTOK"));
                if(retval)
                    num_rsps++;
                return retval;
            }

            public boolean needMoreResponses() {
                return num_rsps < 1;
            }
        });
        transport.setGroupRequest(req);
        boolean rc=req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        Assert.assertEquals(3, results.size());
        Assert.assertEquals(1, results.numReceived());
    }


    @Test(groups=Global.FUNCTIONAL)
    public void testGetAllWithResponseFilter() throws Exception {
        Object[] responses=new Message[]{new Message(null, a1, new Long(1)),
                new Message(null, a2, new Long(2)),
                new Message(null, a3, new Long(3))};
        MyTransport transport=new MyDelayedTransport(true, responses, 500);
        dests.add(a3);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_ALL, 0));
        req.setResponseFilter(new RspFilter() {
            int num_rsps=0;

            public boolean isAcceptable(Object response, Address sender) {
                boolean retval=response instanceof Long &&
                        (((Long)response).longValue() == 1L || ((Long)response).longValue() == 2L);
                System.out.println("-- received " + response + " from " + sender + ": " + (retval? "OK" : "NOTOK"));
                if(retval)
                    num_rsps++;
                return retval;
            }

            public boolean needMoreResponses() {
                return num_rsps < 2;
            }
        });
        transport.setGroupRequest(req);
        boolean rc=req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        Assert.assertEquals(3, results.size());
        Assert.assertEquals(2, results.numReceived());
    }


    /**
	 * test group timeout. demonstrates that the timeout mechanism times out too
	 * quickly as multiple responses are received by the GroupRequest.
	 * Demonstrates by group request receiving multiple messages in a timeframe
	 * less than the total timeout. the request will fail, as after each
	 * received message, the request alters the total timeout.
	 * 
	 * @throws Exception
	 */
    private void _testMessageTimeout(boolean async) throws Exception {
        
        // need multiple destinations to replicate error
        int destCount = 10;
        
        // total timeout to hear from all members
        final long timeout = destCount * 1000;
        
        // how long each destination should delay
        final long delay = 75L;
        Object[] responses = new Message[destCount];
        
        dests = new Vector<Address>();
        for (int i = 0; i < destCount; i++) {
            Address addr = Util.createRandomAddress();
            dests.add(addr);
            // how long does this simulated destination take to execute? the sum is just less than the total timeout
            responses[i] = new Message(null, addr, new Long(i));
        }
        
        MyDelayedTransport tp = new MyDelayedTransport(async, responses, delay);
        
        // instantiate request with dummy correlator
        GroupRequest req=new GroupRequest(new Message(), tp, dests, new RequestOptions(Request.GET_ALL, timeout));
        tp.setGroupRequest(req);
        boolean rc = req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results = req.getResults();
        Assert.assertEquals(dests.size(), results.size());
    }



    private void _testMessageReception(boolean async) throws Exception {
        Object[] responses=new Message[]{new Message(null, a1, new Long(1)),new Message(null, a2, new Long(2))};
        MyTransport transport=new MyTransport(async, responses);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_ALL, 0));
        transport.setGroupRequest(req);
        boolean rc=req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        Assert.assertEquals(2, results.size());
    }

    private void _testMessageReceptionWithSuspect(boolean async) throws Exception {
        Object[] responses=new Object[]{new Message(null, a1, new Long(1)), new SuspectEvent(a2)};
        MyTransport transport=new MyTransport(async, responses);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_ALL, 0));
        transport.setGroupRequest(req);
        boolean rc=req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        assert results.size() == 2;
     }


    private void _testMessageReceptionWithViewChange(boolean async) throws Exception {
        Vector<Address> new_dests=new Vector<Address>();
        new_dests.add(a1);
        new_dests.add(a2);
        new_dests.add(a1);
        Object[] responses=new Object[]{new Message(null, a1, new Long(1)),
                                        new View(Util.createRandomAddress(), 322649, new_dests),
                                        new Message(null, a2, new Long(2))};
        MyTransport transport=new MyTransport(async, responses);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_ALL, 0));
        transport.setGroupRequest(req);
        boolean rc=req.execute();
        System.out.println("group request is " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        Assert.assertEquals(2, results.size());
    }


    private void _testMessageReceptionWithViewChangeMemberLeft(boolean async) throws Exception {
        Vector<Address> new_dests=new Vector<Address>();
        new_dests.add(a2);
        Object[] responses=new Object[]{new Message(null, a2, new Long(1)),
                                        new View(Util.createRandomAddress(), 322649, new_dests)};
        MyTransport transport=new MyTransport(async, responses);
        GroupRequest req=new GroupRequest(new Message(), transport, dests, new RequestOptions(Request.GET_ALL, 0));

        transport.setGroupRequest(req);
        System.out.println("group request before execution: " + req);
        boolean rc=req.execute();
        System.out.println("group request after execution: " + req);
        assert rc;
        assert req.isDone();
        RspList results=req.getResults();
        Assert.assertEquals(2, results.size());
    }





    protected static class MyTransport implements Transport {
        GroupRequest request;
        boolean      async=true;
        Object[]     responses=null;

        public MyTransport(boolean async, Object[] responses) {
            this.async=async;
            this.responses=responses;
        }

        public void setGroupRequest(GroupRequest r) {
            request=r;
        }

        public void send(Message msg) throws Exception {
            if(async) {
                new Thread() {
                    public void run() {
                        sendResponses();
                    }
                }.start();
            }
            else {
                sendResponses();
            }
        }

        public Object receive(long timeout) throws Exception {
            return null;
        }

        void sendResponses() {
            if(responses != null) {
                Object obj;
                for(int i=0; i < responses.length; i++) {
                    obj=responses[i];
                    if(obj == null) {
                        System.err.println("object was null");
                        continue;
                    }
                    if(obj instanceof Message) {
                        Message msg=(Message)obj;
                        Address sender=msg.getSrc();
                        Object retval=null;
                        try {
                            retval=Util.objectFromByteBuffer(msg.getBuffer());
                        }
                        catch(Exception e) {
                            e.printStackTrace();
                        }
                        request.receiveResponse(retval, sender);
                    }
                    else if(obj instanceof SuspectEvent)
                        request.suspect((Address)((SuspectEvent)obj).getMember());
                    else if(obj instanceof View)
                        request.viewChange((View)obj);
                    else
                        System.err.println("Object needs to be Message, SuspectEvent or View");
                }
            }
        }
    }


    /**
     * transport with set delays between messages
     *
     * @author bgodfrey
     *
     */
    private static final class MyDelayedTransport extends MyTransport {
        long delay;

        public MyDelayedTransport(boolean async, Object[] responses) {
            super(async, responses);
        }

        public MyDelayedTransport(boolean async, Object[] responses, long delay) {
            super(async, responses);
            this.delay = delay;
        }


        void sendResponses() {
            if (responses != null) {
                Object obj;
                for (int i = 0; i < responses.length; i++) {
                    try {
                        Thread.sleep(delay);
                    } catch (InterruptedException e1) {
                        e1.printStackTrace();
                    }

                    obj = responses[i];
                    if (obj == null) {
                        System.err.println("object was null");
                        continue;
                    }
                    if (obj instanceof Message) {
                        Message msg = (Message) obj;
                        Address sender = msg.getSrc();
                        Object retval = null;
                        try {
                            retval = Util.objectFromByteBuffer(msg.getBuffer());
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                        request.receiveResponse(retval, sender);
                    } else if (obj instanceof SuspectEvent)
                        request.suspect((Address) ((SuspectEvent) obj).getMember());
                    else if (obj instanceof View)
                        request.viewChange((View) obj);
                    else
                        System.err.println("Object needs to be Message, SuspectEvent or View");
                }
            }
        }
    }

}