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import java.io.IOException;
import java.time.Duration;
import java.util.List;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Stream;
import jdk.jpackage.test.JPackageCommand;
import jdk.jpackage.test.Annotations.Test;
import jdk.jpackage.test.Executor;
import jdk.jpackage.test.HelloApp;
import jdk.jpackage.test.TKit;

/**
 * Test that terminating of the parent app launcher process automatically
 * terminates child app launcher process.
 */

/*
 * @test
 * @summary Test case for JDK-8301247
 * @library ../helpers
 * @build jdk.jpackage.test.*
 * @build Win8301247Test
 * @requires (os.family == "windows")
 * @modules jdk.jpackage/jdk.jpackage.internal
 * @run main/othervm/timeout=360 -Xmx512m  jdk.jpackage.test.Main
 *  --jpt-run=Win8301247Test
 */
public class Win8301247Test {

    @Test
    public void test() throws IOException, InterruptedException {
        JPackageCommand cmd = JPackageCommand.helloAppImage();

        // Launch the app in a way it doesn't exit to let us trap app laucnher
        // processes in the process list
        cmd.addArguments("--java-options", "-Djpackage.test.noexit=true");
        cmd.executeAndAssertImageCreated();

        if (!cmd.canRunLauncher("Not running the test")) {
            return;
        }

        try ( // Launch the app in a separate thread
                ExecutorService exec = Executors.newSingleThreadExecutor()) {
            exec.execute(() -> {
                HelloApp.executeLauncher(cmd);
            });

            // Wait a bit to let the app start
            Thread.sleep(Duration.ofSeconds(10));

            // Get PID of the main app launcher process
            final long pid = findMainAppLauncherPID(cmd, 2).get();

            // Kill the main app launcher process
            Executor.of("taskkill", "/F", "/PID", Long.toString(pid)).
                    dumpOutput(true).execute();

            // Wait a bit and check if child app launcher process is still running (it must NOT)
            Thread.sleep(Duration.ofSeconds(5));

            findMainAppLauncherPID(cmd, 0);
        }
    }

    private static Optional<Long> findMainAppLauncherPID(JPackageCommand cmd,
            int expectedCount) {
        // Get the list of PIDs and PPIDs of app launcher processes.
        // wmic process where (name = "foo.exe") get ProcessID,ParentProcessID
        List<String> output = Executor.of("wmic", "process", "where", "(name",
                "=",
                "\"" + cmd.appLauncherPath().getFileName().toString() + "\"",
                ")", "get", "ProcessID,ParentProcessID").dumpOutput(true).
                saveOutput().executeAndGetOutput();

        if (expectedCount == 0) {
            TKit.assertEquals("No Instance(s) Available.", output.getFirst().
                    trim(), "Check no app launcher processes found running");
            return Optional.empty();
        }

        String[] headers = Stream.of(output.getFirst().split("\\s+", 2)).map(
                String::trim).map(String::toLowerCase).toArray(String[]::new);
        Pattern pattern;
        if (headers[0].equals("parentprocessid") && headers[1].equals(
                "processid")) {
            pattern = Pattern.compile("^(?<ppid>\\d+)\\s+(?<pid>\\d+)\\s+$");
        } else if (headers[1].equals("parentprocessid") && headers[0].equals(
                "processid")) {
            pattern = Pattern.compile("^(?<pid>\\d+)\\s+(?<ppid>\\d+)\\s+$");
        } else {
            throw new RuntimeException(
                    "Unrecognizable output of \'wmic process\' command");
        }

        List<long[]> processes = output.stream().skip(1).map(line -> {
            Matcher m = pattern.matcher(line);
            long[] pids = null;
            if (m.matches()) {
                pids = new long[]{Long.parseLong(m.group("pid")), Long.
                    parseLong(m.group("ppid"))};
            }
            return pids;
        }).filter(Objects::nonNull).toList();

        TKit.assertEquals(expectedCount, processes.size(), String.format(
                "Check [%d] app launcher processes found running", expectedCount));

        switch (expectedCount) {
            case 2 -> {
                if (processes.get(0)[0] == processes.get(1)[1]) {
                    return Optional.of(processes.get(0)[0]);
                } else if (processes.get(1)[0] == processes.get(0)[1]) {
                    return Optional.of(processes.get(1)[0]);
                } else {
                    throw new RuntimeException(
                            "App launcher processes unrelated");
                }
            }
            default ->
                throw new IllegalArgumentException();
        }
    }
}