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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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package jdk.jfr.event.io;

import static jdk.test.lib.Asserts.assertEquals;
import static jdk.test.lib.Asserts.assertTrue;

import java.util.List;
import java.util.stream.Collectors;

import jdk.jfr.event.io.IOEvent.EventType;

import jdk.jfr.consumer.RecordedEvent;
import jdk.test.lib.jfr.Events;


// Helper class to match actual RecordedEvents to expected events.
public class IOHelper {

    public static void verifyEqualsInOrder(List<RecordedEvent> events, List<IOEvent> expectedEvents) throws Throwable {
        List<IOEvent> actualEvents = getTestEvents(events, expectedEvents);
        try {
            assertEquals(actualEvents.size(), expectedEvents.size(), "Wrong number of events.");
            for (int i = 0; i < actualEvents.size(); ++i) {
                assertEquals(actualEvents.get(i), expectedEvents.get(i), "Wrong event at pos " + i);
            }
        } catch (Throwable t) {
            logEvents(actualEvents, expectedEvents);
            throw t;
        }
    }


    public static void verifyEquals(List<RecordedEvent> events, List<IOEvent> expectedEvents) throws Throwable {
        List<IOEvent> actualEvents = getTestEvents(events, expectedEvents);
        try {
            assertEquals(actualEvents.size(), expectedEvents.size(), "Wrong number of events");
            assertTrue(actualEvents.containsAll(expectedEvents), "Not all expected events received");
            assertTrue(expectedEvents.containsAll(actualEvents), "Received unexpected events");
        } catch (Throwable t) {
            logEvents(actualEvents, expectedEvents);
            throw t;
        }
    }


    private static List<IOEvent> getTestEvents(List<RecordedEvent> events, List<IOEvent> expectedEvents) throws Throwable {
        // Log all events
        for (RecordedEvent event : events) {
            String msg = event.getEventType().getName();
            boolean isSocket = IOEvent.EVENT_SOCKET_READ.equals(msg) || IOEvent.EVENT_SOCKET_WRITE.equals(msg);
            boolean isFile = IOEvent.EVENT_FILE_FORCE.equals(msg) || IOEvent.EVENT_FILE_READ.equals(msg) || IOEvent.EVENT_FILE_WRITE.equals(msg);
            boolean isFileReadOrWrite = IOEvent.EVENT_FILE_READ.equals(msg) || IOEvent.EVENT_FILE_WRITE.equals(msg);
            boolean isRead = IOEvent.EVENT_FILE_READ.equals(msg) || IOEvent.EVENT_SOCKET_READ.equals(msg);
            if (isFile) {
                msg += " : " + Events.assertField(event, "path").getValue();
            } else if (isSocket) {
                msg += " - " + Events.assertField(event, "host").getValue();
                msg += "." + Events.assertField(event, "address").getValue();
                msg += "." + Events.assertField(event, "port").getValue();
            }
            if (isSocket || isFileReadOrWrite) {
                String field = isRead ? "bytesRead" : "bytesWritten";
                msg += " : " + Events.assertField(event, field).getValue();
            }
            System.out.println(msg);
        }

        return events.stream()
                        .filter(event -> isTestEvent(event, expectedEvents))
                        .map(event -> IOEvent.createTestEvent(event))
                        .collect(Collectors.toList());
    }

    // A recording may contain extra events that are not part of the test.
    // This function filters out events that not belong to the test.
    public static boolean isTestEvent(RecordedEvent event, List<IOEvent> testEvents) {
        EventType eventType = IOEvent.getEventType(event);
        if (eventType == EventType.UnknownEvent) {
                return false;
        }

        // Only care about threads in the expected threads.
        final String threadName = event.getThread().getJavaName();
        if (testEvents.stream().noneMatch(te -> te.thread.equals(threadName))) {
                return false;
        }

        // Only care about files and sockets in expected events.
        final String address = IOEvent.getEventAddress(event);
        if (testEvents.stream().noneMatch(te -> te.address.equals(address))) {
                return false;
        }
        return true;
    }

    private static void logEvents(List<IOEvent> actualEvents, List<IOEvent> expectedEvents) {
        for (int i = 0; i < actualEvents.size(); ++i) {
            System.out.println("actual event[" + i + "] = " + actualEvents.get(i));
        }
        for (int i = 0; i < expectedEvents.size(); ++i) {
            System.out.println("expected event[" + i + "] = " + expectedEvents.get(i));
        }
    }

}