/*

 * Copyright (c) 2016, 2019, 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 org.graalvm.compiler.hotspot;

import java.util.Formatter;

import java.util.HashMap;

import java.util.Map;

import java.util.Properties;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

/**

 * Mechanism for checking that the current Java runtime environment supports the minimum JVMCI API

 * required by Graal. The {@code JVMCI_VERSION_CHECK} environment variable can be used to ignore a

 * failed check ({@code JVMCI_VERSION_CHECK=ignore}) or print a warning (

 * {@code JVMCI_VERSION_CHECK=warn}) and continue. Otherwise, a failed check results in an

 * {@link InternalError} being raised or, if called from {@link #main(String[])}, the VM exiting

 * with a result code of {@code -1}

 *

 * This class only depends on the JDK so that it can be used without building Graal.

 */

public final class JVMCIVersionCheck {

    public interface Version {

        boolean isLessThan(Version other);

        static Version parse(String vmVersion) {

            Matcher m = Pattern.compile(".*-jvmci-(\\d+)\\.(\\d+)-b(\\d+).*").matcher(vmVersion);

            if (m.matches()) {

                try {

                    int major = Integer.parseInt(m.group(1));

                    int minor = Integer.parseInt(m.group(2));

                    int build = Integer.parseInt(m.group(3));

                    return new Version3(major, minor, build);

                } catch (NumberFormatException e) {

                    // ignore

                }

            }

            m = Pattern.compile(".*-jvmci-(\\d+)(?:\\.|-b)(\\d+).*").matcher(vmVersion);

            if (m.matches()) {

                try {

                    int major = Integer.parseInt(m.group(1));

                    int minor = Integer.parseInt(m.group(2));

                    return new Version2(major, minor);

                } catch (NumberFormatException e) {

                    // ignore

                }

            }

            return null;

        }

    }

    public static class Version2 implements Version {

        private final int major;

        private final int minor;

        public Version2(int major, int minor) {

            this.major = major;

            this.minor = minor;

        }

        @Override

        public boolean isLessThan(Version other) {

            if (other.getClass() == Version3.class) {

                return true;

            }

            Version2 o = (Version2) other;

            if (this.major < o.major) {

                return true;

            }

            if (this.major == o.major && this.minor < o.minor) {

                return true;

            }

            return false;

        }

        @Override

        public String toString() {

            if (major >= 19) {

                return String.format("%d-b%02d", major, minor);

            } else {

                return String.format("%d.%d", major, minor);

            }

        }

    }

    public static class Version3 implements Version {

        private final int major;

        private final int minor;

        private final int build;

        public Version3(int major, int minor, int build) {

            this.major = major;

            this.minor = minor;

            this.build = build;

        }

        @Override

        public boolean isLessThan(Version other) {

            if (other.getClass() == Version2.class) {

                return false;

            }

            Version3 o = (Version3) other;

            if (this.major < o.major) {

                return true;

            }

            if (this.major == o.major) {

                if (this.minor < o.minor) {

                    return true;

                }

                if (this.minor == o.minor && this.build < o.build) {

                    return true;

                }

            }

            return false;

        }

        @Override

        public String toString() {

            return String.format("%d.%d-b%02d", major, minor, build);

        }

    }

        Formatter errorMessage = new Formatter().format(reason, args);

        String javaHome = props.get("java.home");

        String vmName = props.get("java.vm.name");

        errorMessage.format("Set the JVMCI_VERSION_CHECK environment variable to \"ignore\" to suppress ");

        errorMessage.format("this error or to \"warn\" to emit a warning and continue execution.%n");

        errorMessage.format("Currently used Java home directory is %s.%n", javaHome);

        errorMessage.format("Currently used VM configuration is: %s%n", vmName);

            errorMessage.format("Download the latest JVMCI JDK 8 from https://github.com/graalvm/openjdk8-jvmci-builder/releases");

        } else {

        }

        String value = System.getenv("JVMCI_VERSION_CHECK");

        if ("warn".equals(value)) {

            System.err.println(errorMessage.toString());

        } else if ("ignore".equals(value)) {

            return;

        } else if (exit) {

            System.err.println(errorMessage.toString());

            System.exit(-1);

        } else {

            throw new InternalError(errorMessage.toString());

        }

    }

    private final String javaSpecVersion;

    private final String vmVersion;

    private final Map<String, String> props;

    private JVMCIVersionCheck(Map<String, String> props, String javaSpecVersion, String vmVersion) {

        this.props = props;

        this.javaSpecVersion = javaSpecVersion;

        this.vmVersion = vmVersion;

    }

    static void check(Map<String, String> props, boolean exitOnFailure) {

        JVMCIVersionCheck checker = new JVMCIVersionCheck(props, props.get("java.specification.version"), props.get("java.vm.version"));

    }

    /**

     * Entry point for testing.

     */

    public static void check(Map<String, String> props,

                    Version minVersion,

                    String javaSpecVersion,

                    String javaVmVersion, boolean exitOnFailure) {

        JVMCIVersionCheck checker = new JVMCIVersionCheck(props, javaSpecVersion, javaVmVersion);

        checker.run(exitOnFailure, minVersion);

    }

    private void run(boolean exitOnFailure, Version minVersion) {

        if (javaSpecVersion.compareTo("1.9") < 0) {

            Version v = Version.parse(vmVersion);

            if (v != null) {

                if (v.isLessThan(minVersion)) {

                }

                return;

            }

                            "Cannot read JVMCI version from java.vm.version property: %s.%n", vmVersion);

        } else if (javaSpecVersion.compareTo("11") < 0) {

        } else {

            if (vmVersion.contains("SNAPSHOT")) {

                return;

            }

            if (vmVersion.contains("internal")) {

                // Allow local builds

                return;

            }

                // A "labsjdk"

                Version v = Version.parse(vmVersion);

                if (v != null) {

                    if (v.isLessThan(minVersion)) {

                    }

                    return;

                }

                                "Cannot read JVMCI version from java.vm.version property: %s.%n", vmVersion);

            } else {

                // Graal is compatible with all JDK versions as of 11 GA.

            }

        }

    }

    /**

     * Command line interface for performing the check.

     */

    public static void main(String[] args) {

        Properties sprops = System.getProperties();

        Map<String, String> props = new HashMap<>(sprops.size());

        for (String name : sprops.stringPropertyNames()) {

            props.put(name, sprops.getProperty(name));

        }

        check(props, true);

    }

}