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package org.glassfish.jersey.media.sse;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.nio.charset.Charset;
import java.util.Collections;

import javax.ws.rs.RuntimeType;
import javax.ws.rs.core.MediaType;

import javax.inject.Singleton;

import org.glassfish.jersey.internal.util.collection.MultivaluedStringMap;
import org.glassfish.jersey.message.MessageBodyWorkers;
import org.glassfish.jersey.message.internal.MessageBodyFactory;
import org.glassfish.jersey.message.internal.MessagingBinders;

import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.hk2.utilities.ServiceLocatorUtilities;
import org.glassfish.hk2.utilities.binding.AbstractBinder;

import org.junit.Test;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;

/**
 * @author Petr Bouda (petr.bouda at oracle.com)
 */
public class InboundEventReaderTest {

    private static final MultivaluedStringMap headers;

    private static final ServiceLocator locator;

    static {
        headers = new MultivaluedStringMap();
        headers.put("Transfer-Encoding", Collections.singletonList("chunked"));
        headers.put("Content-Type", Collections.singletonList("text/event-stream"));

        locator = ServiceLocatorUtilities.bind(new TestBinder());
    }

    @Test
    public void testReadWithStartsWithLF() throws Exception {
        InboundEvent event = parse(new ByteArrayInputStream("\nevent: custom-message".getBytes()));
        assertEquals("custom-message", event.getName());
        assertEquals(0, event.getRawData().length);
    }

    @Test
    public void testReadWithStartsWithCR() throws Exception {
        InboundEvent event = parse(new ByteArrayInputStream("\revent: custom-message".getBytes()));
        assertEquals("custom-message", event.getName());
        assertEquals(0, event.getRawData().length);
    }

    @Test
    public void testReadWithLF() throws Exception {
        ByteArrayInputStream inputStream = new ByteArrayInputStream("event: custom-message\ndata: message 1".getBytes());
        InboundEvent event = parse(inputStream);
        assertEquals("custom-message", event.getName());
        assertDataEquals("message 1", event);
    }

    @Test
    public void testReadWithCRLF() throws Exception {
        ByteArrayInputStream inputStream = new ByteArrayInputStream("event: custom-message\r\ndata: message 1".getBytes());
        InboundEvent event = parse(inputStream);
        assertEquals("custom-message", event.getName());
        assertDataEquals("message 1", event);
    }

    @Test
    public void testReadWithCR() throws Exception {
        ByteArrayInputStream inputStream = new ByteArrayInputStream("event: custom-message\rdata: message 1".getBytes());
        InboundEvent event = parse(inputStream);
        assertEquals("custom-message", event.getName());
        assertDataEquals("message 1", event);
    }

    @Test
    public void testReadWithMultipleSpaces() throws Exception {
        ByteArrayInputStream inputStream = new ByteArrayInputStream("event:     custom-message\rdata:   message 1".getBytes());
        InboundEvent event = parse(inputStream);
        assertEquals("custom-message", event.getName());
        assertDataEquals("message 1", event);
    }

    @Test
    public void testReadWithMultipleEndingDelimiter() throws Exception {
        ByteArrayInputStream inputStream = new ByteArrayInputStream("event: custom-message\rdata: message 1\r".getBytes());
        InboundEvent event = parse(inputStream);
        assertEquals("custom-message", event.getName());
        assertDataEquals("message 1", event);
    }

    private static InboundEvent parse(InputStream stream) throws IOException {
        return locator.getService(InboundEventReader.class).readFrom(InboundEvent.class, InboundEvent.class, new Annotation[0],
                MediaType.valueOf(SseFeature.SERVER_SENT_EVENTS), headers, stream);
    }

    private void assertDataEquals(final String expectedData, final InboundEvent event) {
        assertEquals(expectedData, event.readData());
        assertEquals(expectedData, new String(event.getRawData(), Charset.defaultCharset()));
    }

    private static class TestBinder extends AbstractBinder {

        @Override
        protected void configure() {
            install(new MessagingBinders.MessageBodyProviders(null, RuntimeType.SERVER));
            bindAsContract(MessageBodyFactory.class).to(MessageBodyWorkers.class).in(Singleton.class);
            bind(InboundEventReader.class).to(InboundEventReader.class);
        }
    }
}