/*

 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * 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).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package requires;

import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Path;

import java.nio.file.Paths;

import java.nio.file.StandardOpenOption;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import java.util.concurrent.Callable;

import java.util.concurrent.TimeUnit;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import sun.hotspot.cpuinfo.CPUInfo;

import sun.hotspot.gc.GC;

import sun.hotspot.WhiteBox;

import jdk.test.lib.Platform;

/**

 * The Class to be invoked by jtreg prior Test Suite execution to

 * collect information about VM.

 * Do not use any API's that may not be available in all target VMs.

 * Properties set by this Class will be available in the @requires expressions.

 */

public class VMProps implements Callable<Map<String, String>> {

    private static final WhiteBox WB = WhiteBox.getWhiteBox();

    /**

     * Collects information about VM properties.

     * This method will be invoked by jtreg.

     *

     * @return Map of property-value pairs.

     */

    @Override

    public Map<String, String> call() {

        Map<String, String> map = new HashMap<>();

        map.put("vm.flavor", vmFlavor());

        map.put("vm.compMode", vmCompMode());

        map.put("vm.bits", vmBits());

        map.put("vm.flightRecorder", vmFlightRecorder());

        map.put("vm.simpleArch", vmArch());

        map.put("vm.debug", vmDebug());

        map.put("vm.jvmci", vmJvmci());

        map.put("vm.emulatedClient", vmEmulatedClient());

        map.put("vm.cpu.features", cpuFeatures());

        map.put("vm.rtm.cpu", vmRTMCPU());

        map.put("vm.rtm.os", vmRTMOS());

        map.put("vm.aot", vmAOT());

        // vm.cds is true if the VM is compiled with cds support.

        map.put("vm.cds", vmCDS());

        map.put("vm.cds.custom.loaders", vmCDSForCustomLoaders());

        // vm.graal.enabled is true if Graal is used as JIT

        map.put("vm.graal.enabled", isGraalEnabled());

        map.put("docker.support", dockerSupport());

        vmGC(map); // vm.gc.X = true/false

        VMProps.dump(map);

        return map;

    }

    /**

     * Prints a stack trace before returning null.

     * Used by the various helper functions which parse information from

     * VM properties in the case where they don't find an expected property

     * or a propoerty doesn't conform to an expected format.

     *

     * @return null

     */

    private String nullWithException(String message) {

        new Exception(message).printStackTrace();

        return null;

    }

    /**

     * @return vm.simpleArch value of "os.simpleArch" property of tested JDK.

     */

    protected String vmArch() {

        String arch = System.getProperty("os.arch");

        if (arch.equals("x86_64") || arch.equals("amd64")) {

            return "x64";

        }

        else if (arch.contains("86")) {

            return "x86";

        } else {

            return arch;

        }

    }

    /**

     * @return VM type value extracted from the "java.vm.name" property.

     */

    protected String vmFlavor() {

        // E.g. "Java HotSpot(TM) 64-Bit Server VM"

        String vmName = System.getProperty("java.vm.name");

        if (vmName == null) {

            return nullWithException("Can't get 'java.vm.name' property");

        }

        Pattern startP = Pattern.compile(".* (\\S+) VM");

        Matcher m = startP.matcher(vmName);

        if (m.matches()) {

            return m.group(1).toLowerCase();

        }

        return nullWithException("Can't get VM flavor from 'java.vm.name'");

    }

    /**

     * @return VM compilation mode extracted from the "java.vm.info" property.

     */

    protected String vmCompMode() {

        // E.g. "mixed mode"

        String vmInfo = System.getProperty("java.vm.info");

        if (vmInfo == null) {

            return nullWithException("Can't get 'java.vm.info' property");

        }

        if (vmInfo.toLowerCase().indexOf("mixed mode") != -1) {

            return "Xmixed";

        } else if (vmInfo.toLowerCase().indexOf("compiled mode") != -1) {

            return "Xcomp";

        } else if (vmInfo.toLowerCase().indexOf("interpreted mode") != -1) {

            return "Xint";

        } else {

            return nullWithException("Can't get compilation mode from 'java.vm.info'");

        }

    }

    /**

     * @return VM bitness, the value of the "sun.arch.data.model" property.

     */

    protected String vmBits() {

        String dataModel = System.getProperty("sun.arch.data.model");

        if (dataModel != null) {

            return dataModel;

        } else {

            return nullWithException("Can't get 'sun.arch.data.model' property");

        }

    }

    /**

     * @return "true" if Flight Recorder is enabled, "false" if is disabled.

     */

    protected String vmFlightRecorder() {

        Boolean isUnlockedCommercialFatures = WB.getBooleanVMFlag("UnlockCommercialFeatures");

        Boolean isFlightRecorder = WB.getBooleanVMFlag("FlightRecorder");

        String startFROptions = WB.getStringVMFlag("StartFlightRecording");

        if (isUnlockedCommercialFatures != null && isUnlockedCommercialFatures) {

            if (isFlightRecorder != null && isFlightRecorder) {

                return "true";

            }

            if (startFROptions != null && !startFROptions.isEmpty()) {

                return "true";

            }

        }

        return "false";

    }

    /**

     * @return debug level value extracted from the "jdk.debug" property.

     */

    protected String vmDebug() {

        String debug = System.getProperty("jdk.debug");

        if (debug != null) {

            return "" + debug.contains("debug");

        } else {

            return nullWithException("Can't get 'jdk.debug' property");

        }

    }

    /**

     * @return true if VM supports JVMCI and false otherwise

     */

    protected String vmJvmci() {

        // builds with jvmci have this flag

        return "" + (WB.getBooleanVMFlag("EnableJVMCI") != null);

    }

    /**

     * @return true if VM runs in emulated-client mode and false otherwise.

     */

    protected String vmEmulatedClient() {

        String vmInfo = System.getProperty("java.vm.info");

        if (vmInfo == null) {

            return "false";

        }

        return "" + vmInfo.contains(" emulated-client");

    }

    /**

     * @return supported CPU features

     */

    protected String cpuFeatures() {

        return CPUInfo.getFeatures().toString();

    }

    /**

     * For all existing GC sets vm.gc.X property.

     * Example vm.gc.G1=true means:

     *    VM supports G1

     *    User either set G1 explicitely (-XX:+UseG1GC) or did not set any GC

     * @param map - property-value pairs

     */

    protected void vmGC(Map<String, String> map){

        GC currentGC = GC.current();

        boolean isByErgo = GC.currentSetByErgo();

        List<GC> supportedGC = GC.allSupported();

        for (GC gc: GC.values()) {

            boolean isSupported = supportedGC.contains(gc);

            boolean isAcceptable = isSupported && (gc == currentGC || isByErgo);

            map.put("vm.gc." + gc.name(), "" + isAcceptable);

        }

    }

    /**

     * @return true if VM runs RTM supported OS and false otherwise.

     */

    protected String vmRTMOS() {

        boolean isRTMOS = true;

        if (Platform.isAix()) {

            // Actually, this works since AIX 7.1.3.30, but os.version property

            // is set to 7.1.

            isRTMOS = (Platform.getOsVersionMajor()  > 7) ||

                      (Platform.getOsVersionMajor() == 7 && Platform.getOsVersionMinor() > 1);

        } else if (Platform.isLinux()) {

            if (Platform.isPPC()) {

                isRTMOS = (Platform.getOsVersionMajor()  > 4) ||

                          (Platform.getOsVersionMajor() == 4 && Platform.getOsVersionMinor() > 1);

            }

        }

        return "" + isRTMOS;

    }

    /**

     * @return true if VM runs RTM supported CPU and false otherwise.

     */

    protected String vmRTMCPU() {

        boolean vmRTMCPU = (Platform.isPPC() ? CPUInfo.hasFeature("tcheck") : CPUInfo.hasFeature("rtm"));

        return "" + vmRTMCPU;

    }

    /**

     * @return true if VM supports AOT and false otherwise

     */

    protected String vmAOT() {

        // builds with aot have jaotc in <JDK>/bin

        Path bin = Paths.get(System.getProperty("java.home"))

                        .resolve("bin");

        Path jaotc;

        if (Platform.isWindows()) {

            jaotc = bin.resolve("jaotc.exe");

        } else {

            jaotc = bin.resolve("jaotc");

        }

        return "" + Files.exists(jaotc);

    }

    /**

     * Check for CDS support.

     *

     * @return true if CDS is supported by the VM to be tested.

     */

    protected String vmCDS() {

        if (WB.isCDSIncludedInVmBuild()) {

            return "true";

        } else {

            return "false";

        }

    }

    /**

     * Check for CDS support for custom loaders.

     *

     * @return true if CDS is supported for customer loader by the VM to be tested.

     */

    protected String vmCDSForCustomLoaders() {

        if (vmCDS().equals("true") && Platform.areCustomLoadersSupportedForCDS()) {

            return "true";

        } else {

            return "false";

        }

    }

    /**

     * Check if Graal is used as JIT compiler.

     *

     * @return true if Graal is used as JIT compiler.

     */

    protected String isGraalEnabled() {

        // Graal is enabled if following conditions are true:

        // - we are not in Interpreter mode

        // - UseJVMCICompiler flag is true

        // - jvmci.Compiler variable is equal to 'graal'

        // - TieredCompilation is not used or TieredStopAtLevel is greater than 3

        Boolean useCompiler = WB.getBooleanVMFlag("UseCompiler");

        if (useCompiler == null || !useCompiler)

            return "false";

        Boolean useJvmciComp = WB.getBooleanVMFlag("UseJVMCICompiler");

        if (useJvmciComp == null || !useJvmciComp)

            return "false";

        // This check might be redundant but let's keep it for now.

        String jvmciCompiler = System.getProperty("jvmci.Compiler");

        if (jvmciCompiler == null || !jvmciCompiler.equals("graal")) {

            return "false";

        }

        Boolean tieredCompilation = WB.getBooleanVMFlag("TieredCompilation");

        Long compLevel = WB.getIntxVMFlag("TieredStopAtLevel");

        // if TieredCompilation is enabled and compilation level is <= 3 then no Graal is used

        if (tieredCompilation != null && tieredCompilation && compLevel != null && compLevel <= 3)

            return "false";

        return "true";

    }

   /**

     * A simple check for docker support

     *

     * @return true if docker is supported in a given environment

     */

    protected String dockerSupport() {

            return "false";

        boolean isSupported;

        try {

            isSupported = checkDockerSupport();

        } catch (Exception e) {

            isSupported = false;

        }

        return (isSupported) ? "true" : "false";

    }

    private boolean checkDockerSupport() throws IOException, InterruptedException {

        ProcessBuilder pb = new ProcessBuilder("docker", "ps");

        Process p = pb.start();

        p.waitFor(10, TimeUnit.SECONDS);

        return (p.exitValue() == 0);

    }

    /**

     * Dumps the map to the file if the file name is given as the property.

     * This functionality could be helpful to know context in the real

     * execution.

     *

     * @param map

     */

    protected static void dump(Map<String, String> map) {

        String dumpFileName = System.getProperty("vmprops.dump");

        if (dumpFileName == null) {

            return;

        }

        List<String> lines = new ArrayList<>();

        map.forEach((k, v) -> lines.add(k + ":" + v));

        try {

            Files.write(Paths.get(dumpFileName), lines, StandardOpenOption.APPEND);

        } catch (IOException e) {

            throw new RuntimeException("Failed to dump properties into '"

                    + dumpFileName + "'", e);

        }

    }

    /**

     * This method is for the testing purpose only.

     * @param args

     */

    public static void main(String args[]) {

        Map<String, String> map = new VMProps().call();

        map.forEach((k, v) -> System.out.println(k + ": '" + v + "'"));

    }

}