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package jdk.jfr.api.recording.destination;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.util.List;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordingFile;

import jdk.test.lib.Asserts;

import jdk.test.lib.jfr.CommonHelper;

import jdk.test.lib.jfr.EventNames;

import jdk.test.lib.jfr.VoidFunction;

/*

 * @test

 * @summary Test setDestination to invalid paths

 * @key jfr

 * @library /test/lib

 * @run main/othervm jdk.jfr.api.recording.destination.TestDestInvalid

 */

public class TestDestInvalid {

    public static void main(String[] args) throws Throwable {

        Recording r = new Recording();

        r.enable(EventNames.OSInformation);

        r.setToDisk(true);

        Asserts.assertNull(r.getDestination(), "dest not null by default");

        // Set destination to empty path (same as curr dir, not a file)

        verifyException(()->{r.setDestination(Paths.get(""));}, "No exception for setDestination(\"\")", IOException.class);

        System.out.println("1 destination: " + r.getDestination());

        Asserts.assertNull(r.getDestination(), "default dest not null after failed setDest");

        // Set dest to a valid path. This should be kept when a new setDest fails.

        Path dest = Paths.get(".", "my.jfr");

        r.setDestination(dest);

        System.out.println("2 destination: " + r.getDestination());

        Asserts.assertEquals(dest, r.getDestination(), "Wrong get/set dest");

        // Null is allowed for setDestination()

        r.setDestination(null);

        System.out.println("3 destination: " + r.getDestination());

        Asserts.assertNull(r.getDestination(), "dest not null after setDest(null)");

        // Reset dest to correct value and make ssure it is not overwritten

        r.setDestination(dest);

        System.out.println("4 destination: " + r.getDestination());

        Asserts.assertEquals(dest, r.getDestination(), "Wrong get/set dest");

        // Set destination to an existing dir. Old dest is saved.

        verifyException(()->{r.setDestination(Paths.get("."));}, "No exception for setDestination(.)", IOException.class);

        System.out.println("5 destination: " + r.getDestination());

        Asserts.assertEquals(dest, r.getDestination(), "Wrong get/set dest");

        // Set destination to a non-existing dir. Old dest is saved.

        verifyException(()->{r.setDestination(Paths.get(".", "missingdir", "my.jfr"));}, "No exception for setDestination(dirNotExists)", IOException.class);

        System.out.println("6 destination: " + r.getDestination());

        Asserts.assertEquals(dest, r.getDestination(), "Wrong get/set dest");

        // Verify that it works with the old setDest value.

        r.start();

        r.stop();

        r.close();

        Asserts.assertTrue(Files.exists(dest), "No recording file: " + dest);

        List<RecordedEvent> events = RecordingFile.readAllEvents(dest);

        Asserts.assertFalse(events.isEmpty(), "No event found");

        System.out.printf("Found event %s in %s%n", events.get(0).getEventType().getName(), dest.toString());

    }

    private static void verifyException(VoidFunction f, String msg, Class<?> exceptionClass) throws Throwable {

        CommonHelper.verifyException(f, msg, IOException.class);

    }

}