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package jdk.jfr.cmd;

import java.io.FileWriter;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import jdk.jfr.Event;

import jdk.jfr.Name;

import jdk.jfr.Recording;

import jdk.jfr.consumer.RecordedEvent;

import jdk.jfr.consumer.RecordingFile;

import jdk.jfr.internal.Repository;

import jdk.jfr.internal.SecuritySupport.SafePath;

import jdk.test.lib.Asserts;

import jdk.test.lib.process.OutputAnalyzer;

 * @test

 * @summary Test jfr reconstruct

 * @key jfr

 * @library /test/lib /test/jdk

 * @modules jdk.jfr/jdk.jfr.internal

 * @run main/othervm jdk.jfr.cmd.TestReconstruct

 */

public class TestReconstruct {

    @Name("Correlation")

    static class CorrelationEvent extends Event {

        int id;

    }

    private static int RECORDING_COUNT = 5;

    @SuppressWarnings("resource")

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

        // Create some disk recordings

        Recording[] recordings = new Recording[5];

        for (int i = 0; i < RECORDING_COUNT; i++) {

            Recording r = new Recording();

            r.setToDisk(true);

            r.start();

            CorrelationEvent ce = new CorrelationEvent();

            ce.id = i;

            ce.commit();

            r.stop();

            recordings[i] = r;

        }

        Path dir = Paths.get("reconstruction-parts");

        Files.createDirectories(dir);

        long expectedCount = 0;

        for (int i = 0; i < RECORDING_COUNT; i++) {

            Path tmp = dir.resolve("chunk-part-" + i + ".jfr");

            recordings[i].dump(tmp);

            expectedCount += countEventInRecording(tmp);

        }

        SafePath repository = Repository.getRepository().getRepositoryPath();

        Path destinationPath = Paths.get("reconstructed.jfr");

        String directory = repository.toString();

        String destination = destinationPath.toAbsolutePath().toString();

        // Test failure

        OutputAnalyzer output = ExecuteHelper.run("reconstruct");

        output.shouldContain("Too few arguments");

        output = ExecuteHelper.run("reconstruct", directory);

        output.shouldContain("Too few arguments");

        output = ExecuteHelper.run("reconstruct", "not-a-directory", destination);

        output.shouldContain("Could not find disk repository at");

        output = ExecuteHelper.run("reconstruct", directory, "not-a-destination");

        output.shouldContain("Filename must end with .jfr");

        output = ExecuteHelper.run("reconstruct", "--wrongOption", directory, destination);

        output.shouldContain("Too many arguments");

        FileWriter fw = new FileWriter(destination);

        fw.write('d');

        fw.close();

        output = ExecuteHelper.run("reconstruct", directory, destination);

        output.shouldContain("already exists");

        Files.delete(destinationPath);

        // test success

        output = ExecuteHelper.run("reconstruct", directory, destination);

        System.out.println(output.getOutput());

        output.shouldContain("Reconstruction complete");

        long reconstructedCount = countEventInRecording(destinationPath);

        Asserts.assertEquals(expectedCount, reconstructedCount);

        // Cleanup

        for (int i = 0; i < RECORDING_COUNT; i++) {

            recordings[i].close();

        }

    }

    private static long countEventInRecording(Path file) throws IOException {

        Integer lastId = -1;

        try (RecordingFile rf = new RecordingFile(file)) {

            long count = 0;

            while (rf.hasMoreEvents()) {

                RecordedEvent re = rf.readEvent();

                if (re.getEventType().getName().equals("Correlation")) {

                    Integer id = re.getValue("id");

                    if (id < lastId) {

                        Asserts.fail("Expected chunk number to increase");

                    }

                    lastId = id;

                }

                count++;

            }

            return count;

        }

    }

}