package jmri.jmrix.easydcc;

import java.io.*;

import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;

import java.util.Vector;

import jmri.util.JUnitUtil;

import org.junit.jupiter.api.*;

/**
 * JUnit tests for the EasyDccTrafficController class
 *
 * @author Bob Jacobsen Copyright (C) 2003, 2007, 2015
 */
@Timeout(90)
public class EasyDccTrafficControllerTest extends jmri.jmrix.AbstractMRTrafficControllerTest {

    @Test
    public void testSendThenRcvReply() throws IOException {
        EasyDccTrafficController c = new EasyDccTrafficController(new EasyDccSystemConnectionMemo("E", "EasyDCC Test")){
            @Override
            protected void terminate(){
               // do nothing, so we don't try to write to a closed pipe
               // after this test
            }
        };

        // connect to iostream via port controller
        EasyDccPortControllerScaffold p = new EasyDccPortControllerScaffold();
        c.connectPort(p);

        // object to receive reply
        EasyDccListenerScaffold l = new EasyDccListenerScaffold();
        assertNull(l.rcvdMsg);
        c.addEasyDccListener(l);

        // send a message
        EasyDccMessage m = new EasyDccMessage(3);
        m.setOpCode('0');
        m.setElement(1, '1');
        m.setElement(2, '2');
        c.sendEasyDccMessage(m, l);

        ostream.flush();
        JUnitUtil.waitFor(()->{return tostream.available() == 4;}, "total length");
        
        // test the result of sending
        assertEquals( 4, tostream.available(), "total length ");
        assertEquals( (byte)'0', tostream.readByte(), "Char 0");
        assertEquals( (byte)'1', tostream.readByte(), "Char 1");
        assertEquals( (byte)'2', tostream.readByte(), "Char 2");
        assertEquals( 0x0d, tostream.readByte(), "EOM");

        // now send reply
        tistream.write('P');
        tistream.write(0x0d);

        // threading causes the traffic controller to handle the reply,
        // so wait until that happens.
        JUnitUtil.waitFor(()->{return l.rcvdReply != null;}, "reply received");

        assertNotNull( l.rcvdReply, "reply received ");
        assertEquals( 'P', l.rcvdReply.getOpCode(), "first char of reply ");
        c.terminateThreads(); // stop any threads we might have created.
    }

    // internal class to simulate an EasyDccPortController
    private class EasyDccPortControllerScaffold extends EasyDccPortController {

        EasyDccPortControllerScaffold() {
            super(new EasyDccSystemConnectionMemo());
            assertDoesNotThrow( () -> {
                PipedInputStream tempPipe;
                tempPipe = new PipedInputStream();
                tostream = new DataInputStream(tempPipe);
                ostream = new DataOutputStream(new PipedOutputStream(tempPipe));
                tempPipe = new PipedInputStream();
                istream = new DataInputStream(tempPipe);
                tistream = new DataOutputStream(new PipedOutputStream(tempPipe));
            });
        }

        @Override
        public Vector<String> getPortNames() {
            return null;
        }

        @Override
        public String openPort(String portName, String appName) {
            return null;
        }

        @Override
        public void configure() {
        }

        @Override
        public String[] validBaudRates() {
            return new String[] {};
        }

        //@Override
        @Override
        public int[] validBaudNumbers() {
            return new int[] {};
        }

        // returns the InputStream from the port
        @Override
        public DataInputStream getInputStream() {
            return istream;
        }

        // returns the outputStream to the port
        @Override
        public DataOutputStream getOutputStream() {
            return ostream;
        }

        // check that this object is ready to operate
        @Override
        public boolean status() {
            return true;
        }
    }

    private DataOutputStream ostream;  // Traffic controller writes to this
    private DataInputStream tostream;  // so we can read it from this

    private DataOutputStream tistream; // tests write to this
    private DataInputStream istream;   // so the traffic controller can read from this

    private EasyDccSystemConnectionMemo memo;

    @Override
    @BeforeEach
    public void setUp() {
        JUnitUtil.setUp();
        memo = new EasyDccSystemConnectionMemo("E", "EasyDCC Test");
        tc = new EasyDccTrafficController(memo);
    }

    @Override
    @AfterEach
    public void tearDown() {
        if (tc!=null) {
            tc.terminateThreads();
        }
        if ( memo != null ) {
            memo.dispose();
            memo = null;
        }
        JUnitUtil.tearDown();
    }

}