/*

 * Copyright (c) 2015, 2016, 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 optionsvalidation;

import com.sun.tools.attach.VirtualMachine;

import com.sun.tools.attach.AttachOperationFailedException;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.Set;

import jdk.test.lib.DynamicVMOption;

import jdk.test.lib.process.OutputAnalyzer;

import jdk.test.lib.process.ProcessTools;

import jdk.test.lib.dcmd.CommandExecutor;

import jdk.test.lib.dcmd.JMXExecutor;

import sun.tools.attach.HotSpotVirtualMachine;

import static optionsvalidation.JVMOptionsUtils.failedMessage;

import static optionsvalidation.JVMOptionsUtils.GCType;

import static optionsvalidation.JVMOptionsUtils.printOutputContent;

import static optionsvalidation.JVMOptionsUtils.VMType;

public abstract class JVMOption {

    /**

     * Executor for JCMD

     */

    private final static CommandExecutor executor = new JMXExecutor();

    /**

     * Name of the tested parameter

     */

    protected String name;

    /**

     * Range is defined for option inside VM

     */

    protected boolean withRange;

    /**

     * Test valid min range value and additional small values

     */

    protected boolean testMinRange;

    /**

     * Test valid max range value and additional big values

     */

    protected boolean testMaxRange;

    private Set<Integer> allowedExitCodes;

    /**

     * Prepend string which added before testing option to the command line

     */

    private final List<String> prepend;

    private final StringBuilder prependString;

    protected JVMOption() {

        this.prepend = new ArrayList<>();

        prependString = new StringBuilder();

        allowedExitCodes = new HashSet<>();

        allowedExitCodes.add(0);

        allowedExitCodes.add(1);

        withRange = false;

        testMinRange = true;

        testMaxRange = true;

    }

    /**

     * Create JVM Option with given type and name.

     *

     * @param type type: "intx", "size_t", "uintx", "uint64_t" or "double"

     * @param name name of the option

     * @return created JVMOption

     */

    static JVMOption createVMOption(String type, String name) {

        JVMOption parameter;

        switch (type) {

            case "int":

            case "intx":

            case "size_t":

            case "uint":

            case "uintx":

            case "uint64_t":

                parameter = new IntJVMOption(name, type);

                break;

            case "double":

                parameter = new DoubleJVMOption(name);

                break;

            default:

                throw new Error("Expected only \"int\", \"intx\", \"size_t\", "

                        + "\"uint\", \"uintx\", \"uint64_t\", or \"double\" "

                        + "option types! Got " + type + " type!");

        }

        return parameter;

    }

    /**

     * Add passed options to the prepend options of the option. Prepend options

     * will be added before testing option to the command line.

     *

     * @param options array of prepend options

     */

    public final void addPrepend(String... options) {

        String toAdd;

        for (String option : options) {

            if (option.startsWith("-")) {

                toAdd = option;

            } else {

                /* Add "-" before parameter name */

                toAdd = "-" + option;

            }

            prepend.add(toAdd);

            prependString.append(toAdd).append(" ");

        }

    }

    /**

     * Get name of the option

     *

     * @return name of the option

     */

    final String getName() {

        return name;

    }

    /**

     * Mark this option as option which range is defined inside VM

     */

    final void optionWithRange() {

        withRange = true;

    }

    /**

     * Exclude testing of min range value for this option

     */

    public final void excludeTestMinRange() {

        testMinRange = false;

    }

    /**

     * Exclude testing of max range value for this option

     */

    public final void excludeTestMaxRange() {

        testMaxRange = false;

    }

    public final void setAllowedExitCodes(Integer... allowedExitCodes) {

        this.allowedExitCodes.addAll(Arrays.asList(allowedExitCodes));

    }

    /**

     * Set new minimum option value

     *

     * @param min new minimum value

     */

    abstract void setMin(String min);

    /**

     * Get string with minimum value of the option

     *

     * @return string with minimum value of the option

     */

    abstract String getMin();

    /**

     * Set new maximum option value

     *

     * @param max new maximum value

     */

    abstract void setMax(String min);

    /**

     * Get string with maximum value of the option

     *

     * @return string with maximum value of the option

     */

    abstract String getMax();

    /**

     * Return list of strings with valid option values which used for testing

     * using jcmd, attach and etc.

     *

     * @return list of strings which contain valid values for option

     */

    protected abstract List<String> getValidValues();

    /**

     * Return list of strings with invalid option values which used for testing

     * using jcmd, attach and etc.

     *

     * @return list of strings which contain invalid values for option

     */

    protected abstract List<String> getInvalidValues();

    /**

     * Return expected error message for option with value "value" when it used

     * on command line with passed value

     *

     * @param value option value

     * @return expected error message

     */

    protected abstract String getErrorMessageCommandLine(String value);

    /**

     * Testing writeable option using DynamicVMOption isValidValue and

     * isInvalidValue methods

     *

     * @return number of failed tests

     */

    public int testDynamic() {

        DynamicVMOption option = new DynamicVMOption(name);

        int failedTests = 0;

        String origValue;

        if (option.isWriteable()) {

            System.out.println("Testing " + name + " option dynamically by DynamicVMOption");

            origValue = option.getValue();

            for (String value : getValidValues()) {

                if (!option.isValidValue(value)) {

                    failedMessage(String.format("Option %s: Valid value \"%s\" is invalid", name, value));

                    failedTests++;

                }

            }

            for (String value : getInvalidValues()) {

                if (option.isValidValue(value)) {

                    failedMessage(String.format("Option %s: Invalid value \"%s\" is valid", name, value));

                    failedTests++;

                }

            }

            option.setValue(origValue);

        }

        return failedTests;

    }

    /**

     * Testing writeable option using Jcmd

     *

     * @return number of failed tests

     */

    public int testJcmd() {

        DynamicVMOption option = new DynamicVMOption(name);

        int failedTests = 0;

        OutputAnalyzer out;

        String origValue;

        if (option.isWriteable()) {

            System.out.println("Testing " + name + " option dynamically by jcmd");

            origValue = option.getValue();

            for (String value : getValidValues()) {

                out = executor.execute(String.format("VM.set_flag %s %s", name, value), true);

                if (out.getOutput().contains(name + " error")) {

                    failedMessage(String.format("Option %s: Can not change "

                            + "option to valid value \"%s\" via jcmd", name, value));

                    printOutputContent(out);

                    failedTests++;

                }

            }

            for (String value : getInvalidValues()) {

                out = executor.execute(String.format("VM.set_flag %s %s", name, value), true);

                if (!out.getOutput().contains(name + " error")) {

                    failedMessage(String.format("Option %s: Error not reported for "

                            + "option when it chagned to invalid value \"%s\" via jcmd", name, value));

                    printOutputContent(out);

                    failedTests++;

                }

            }

            option.setValue(origValue);

        }

        return failedTests;

    }

    private boolean setFlagAttach(HotSpotVirtualMachine vm, String flagName, String flagValue) throws Exception {

        boolean result;

        try {

            vm.setFlag(flagName, flagValue);

            result = true;

        } catch (AttachOperationFailedException e) {

            result = false;

        }

        return result;

    }

    /**

     * Testing writeable option using attach method

     *

     * @return number of failed tests

     * @throws Exception if an error occurred while attaching to the target JVM

     */

    public int testAttach() throws Exception {

        DynamicVMOption option = new DynamicVMOption(name);

        int failedTests = 0;

        String origValue;

        if (option.isWriteable()) {

            System.out.println("Testing " + name + " option dynamically via attach");

            origValue = option.getValue();

            HotSpotVirtualMachine vm = (HotSpotVirtualMachine) VirtualMachine.attach(String.valueOf(ProcessTools.getProcessId()));

            for (String value : getValidValues()) {

                if (!setFlagAttach(vm, name, value)) {

                    failedMessage(String.format("Option %s: Can not change option to valid value \"%s\" via attach", name, value));

                    failedTests++;

                }

            }

            for (String value : getInvalidValues()) {

                if (setFlagAttach(vm, name, value)) {

                    failedMessage(String.format("Option %s: Option changed to invalid value \"%s\" via attach", name, value));

                    failedTests++;

                }

            }

            vm.detach();

            option.setValue(origValue);

        }

        return failedTests;

    }

    /**

     * Run java with passed parameter and check the result depending on the

     * 'valid' parameter

     *

     * @param param tested parameter passed to the JVM

     * @param valid indicates whether the JVM should fail or not

     * @return true - if test passed

     * @throws Exception if java process can not be started

     */

    private boolean runJavaWithParam(String optionValue, boolean valid) throws Exception {

        int exitCode;

        boolean result = true;

        String errorMessage = null;

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

        OutputAnalyzer out;

        if (VMType != null) {

            runJava.add(VMType);

        }

            runJava.add(GCType);

        }

        runJava.addAll(prepend);

        runJava.add(optionValue);

        runJava.add(JVMStartup.class.getName());

        out = new OutputAnalyzer(ProcessTools.createJavaProcessBuilder(runJava.toArray(new String[0])).start());

        exitCode = out.getExitValue();

        if (out.getOutput().contains("A fatal error has been detected by the Java Runtime Environment")) {

            /* Always consider "fatal error" in output as fail */

            errorMessage = "JVM output reports a fatal error. JVM exited with code " + exitCode + "!";

        } else if (valid == true) {

            if (!allowedExitCodes.contains(exitCode)) {

                errorMessage = "JVM exited with unexpected error code = " + exitCode;

            } else if ((exitCode != 0) && (out.getOutput().isEmpty() == true)) {

                errorMessage = "JVM exited with error(exitcode == " + exitCode + "), but with empty stdout and stderr. " +

                       "Description of error is needed!";

            } else if (out.getOutput().contains("is outside the allowed range")) {

                errorMessage = "JVM output contains \"is outside the allowed range\"";

            }

        } else {

            // valid == false

            String value = optionValue.substring(optionValue.lastIndexOf("=") + 1);

            String errorMessageCommandLineValue = getErrorMessageCommandLine(value);

            if (exitCode == 0) {

                errorMessage = "JVM successfully exit";

            } else if (exitCode != 1) {

                errorMessage = "JVM exited with code " + exitCode + " which not equal to 1";

            } else if (!out.getOutput().contains(errorMessageCommandLineValue)) {

                errorMessage = "JVM output does not contain expected output \"" + errorMessageCommandLineValue + "\"";

            }

        }

        if (errorMessage != null) {

            String fullOptionString = String.format("%s %s %s %s",

                    VMType == null ? "" : VMType, GCType == null ? "" : GCType, prependString.toString(), optionValue).trim().replaceAll("  +", " ");

            failedMessage(name, fullOptionString, valid, errorMessage);

            printOutputContent(out);

            result = false;

        }

        System.out.println("");

        return result;

    }

    /**

     * Construct option string with passed value

     *

     * @param value parameter value

     * @return string containing option with passed value

     */

    private String constructOption(String value) {

        return "-XX:" + name + "=" + value;

    }

    /**

     * Return list of strings which contain options with valid values which can

     * be used for testing on command line

     *

     * @return list of strings which contain options with valid values

     */

    private List<String> getValidCommandLineOptions() {

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

        for (String value : getValidValues()) {

            validParameters.add(constructOption(value));

        }

        return validParameters;

    }

    /**

     * Return list of strings which contain options with invalid values which

     * can be used for testing on command line

     *

     * @return list of strings which contain options with invalid values

     */

    private List<String> getInvalidCommandLineOptions() {

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

        for (String value : getInvalidValues()) {

            invalidParameters.add(constructOption(value));

        }

        return invalidParameters;

    }

    /**

     * Perform test of the parameter. Call java with valid option values and

     * with invalid option values.

     *

     * @return number of failed tests

     * @throws Exception if java process can not be started

     */

    public int testCommandLine() throws Exception {

        ProcessBuilder pb;

        int failed = 0;

        List<String> optionValuesList;

        optionValuesList = getValidCommandLineOptions();

        if (optionValuesList.isEmpty() != true) {

            System.out.println("Testing valid " + name + " values.");

            for (String optionValid : optionValuesList) {

                if (runJavaWithParam(optionValid, true) == false) {

                    failed++;

                }

            }

        }

        optionValuesList = getInvalidCommandLineOptions();

        if (optionValuesList.isEmpty() != true) {

            System.out.println("Testing invalid " + name + " values.");

            for (String optionInvalid : optionValuesList) {

                if (runJavaWithParam(optionInvalid, false) == false) {

                    failed++;

                }

            }

        }

        /* return number of failed tests for this option */

        return failed;

    }