/*

 * Copyright (c) 2014, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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.

 */

#include "JavaVirtualMachine.h"

#include "Platform.h"

#include "PlatformString.h"

#include "FilePath.h"

#include "Package.h"

#include "Helpers.h"

#include "Messages.h"

#include "Macros.h"

#include "jni.h"

#include <map>

#include <list>

#include <sstream>

bool RunVM() {

    JavaVirtualMachine javavm;

    bool result = javavm.StartJVM();

    if (!result) {

        Platform& platform = Platform::GetInstance();

        platform.ShowMessage(_T("Failed to launch JVM\n"));

    }

    return result;

}

//----------------------------------------------------------------------------

JavaOptions::JavaOptions(): FOptions(NULL) {

}

JavaOptions::~JavaOptions() {

    if (FOptions != NULL) {

        for (unsigned int index = 0; index < GetCount(); index++) {

            delete[] FOptions[index].optionString;

        }

        delete[] FOptions;

    }

}

void JavaOptions::AppendValue(const TString Key, TString Value, void* Extra) {

    JavaOptionItem item;

    item.name = Key;

    item.value = Value;

    item.extraInfo = Extra;

    FItems.push_back(item);

}

void JavaOptions::AppendValue(const TString Key, TString Value) {

    AppendValue(Key, Value, NULL);

}

void JavaOptions::AppendValue(const TString Key) {

    AppendValue(Key, _T(""), NULL);

}

void JavaOptions::AppendValues(OrderedMap<TString, TString> Values) {

    std::vector<TString> orderedKeys = Values.GetKeys();

    for (std::vector<TString>::const_iterator iterator = orderedKeys.begin();

        iterator != orderedKeys.end(); iterator++) {

        TString name = *iterator;

        TString value;

        if (Values.GetValue(name, value) == true) {

            AppendValue(name, value);

        }

    }

}

void JavaOptions::ReplaceValue(const TString Key, TString Value) {

    for (std::list<JavaOptionItem>::iterator iterator = FItems.begin();

        iterator != FItems.end(); iterator++) {

        TString lkey = iterator->name;

        if (lkey == Key) {

            JavaOptionItem item = *iterator;

            item.value = Value;

            iterator = FItems.erase(iterator);

            FItems.insert(iterator, item);

            break;

        }

    }

}

std::list<TString> JavaOptions::ToList() {

    std::list<TString> result;

    Macros& macros = Macros::GetInstance();

    for (std::list<JavaOptionItem>::const_iterator iterator = FItems.begin();

        iterator != FItems.end(); iterator++) {

        TString key = iterator->name;

        TString value = iterator->value;

        TString option = Helpers::NameValueToString(key, value);

        option = macros.ExpandMacros(option);

        result.push_back(option);

    }

    return result;

}

size_t JavaOptions::GetCount() {

    return FItems.size();

}

//----------------------------------------------------------------------------

JavaVirtualMachine::JavaVirtualMachine() {

}

JavaVirtualMachine::~JavaVirtualMachine(void) {

}

bool JavaVirtualMachine::StartJVM() {

    Platform& platform = Platform::GetInstance();

    Package& package = Package::GetInstance();

    TString classpath = package.GetClassPath();

    TString modulepath = package.GetModulePath();

    JavaOptions options;

    if (modulepath.empty() == false) {

        options.AppendValue(_T("-Djava.module.path"), modulepath);

    }

    options.AppendValue(_T("-Djava.library.path"),

            package.GetPackageAppDirectory() + FilePath::PathSeparator()

            + package.GetPackageLauncherDirectory());

    options.AppendValue(

            _T("-Djava.launcher.path"), package.GetPackageLauncherDirectory());

    options.AppendValues(package.GetJavaOptions());

#ifdef DEBUG

    if (package.Debugging() == dsJava) {

        options.AppendValue(_T("-Xdebug"), _T(""));

        options.AppendValue(

                _T("-Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=localhost:5005"),

                _T(""));

        platform.ShowMessage(_T("localhost:5005"));

    }

#endif // DEBUG

    TString maxHeapSizeOption;

    TString minHeapSizeOption;

    if (package.GetMemoryState() == PackageBootFields::msAuto) {

        TPlatformNumber memorySize = package.GetMemorySize();

        TString memory =

                PlatformString((size_t)memorySize).toString() + _T("m");

        maxHeapSizeOption = TString(_T("-Xmx")) + memory;

        options.AppendValue(maxHeapSizeOption, _T(""));

        if (memorySize > 256)

            minHeapSizeOption = _T("-Xms256m");

        else

            minHeapSizeOption = _T("-Xms") + memory;

        options.AppendValue(minHeapSizeOption, _T(""));

    }

    TString mainClassName = package.GetMainClassName();

    TString mainModule = package.GetMainModule();

    if (mainClassName.empty() == true && mainModule.empty() == true) {

        Messages& messages = Messages::GetInstance();

        platform.ShowMessage(messages.GetMessage(NO_MAIN_CLASS_SPECIFIED));

        return false;

    }

    configureLibrary();

    // Initialize the arguments to JLI_Launch()

    //

    // On Mac OS X JLI_Launch spawns a new thread that actually starts the JVM.

    // This new thread simply re-runs main(argc, argv). Therefore we do not

    // want to add new args if we are still in the original main thread so we

    // will treat them as command line args provided by the user ...

    // Only propagate original set of args first time.

    options.AppendValue(_T("-classpath"));

    options.AppendValue(classpath);

    std::list<TString> vmargs;

    vmargs.push_back(package.GetCommandName());

    if (package.HasSplashScreen() == true) {

        options.AppendValue(TString(_T("-splash:"))

                + package.GetSplashScreenFileName(), _T(""));

    }

    if (mainModule.empty() == true) {

        options.AppendValue(Helpers::ConvertJavaPathToId(mainClassName),

                _T(""));

    } else {

        options.AppendValue(_T("-m"));

        options.AppendValue(mainModule);

    }

    return launchVM(options, vmargs);

}

void JavaVirtualMachine::configureLibrary() {

    Platform& platform = Platform::GetInstance();

    Package& package = Package::GetInstance();

    TString libName = package.GetJavaLibraryFileName();

    platform.addPlatformDependencies(&javaLibrary);

    javaLibrary.Load(libName);

}

bool JavaVirtualMachine::launchVM(JavaOptions& options,

        std::list<TString>& vmargs) {

    Platform& platform = Platform::GetInstance();

    Package& package = Package::GetInstance();

#ifdef MAC

    // Mac adds a ProcessSerialNumber to args when launched from .app

    // filter out the psn since they it's not expected in the app

    if (platform.IsMainThread() == false) {

        std::list<TString> loptions = options.ToList();

        vmargs.splice(vmargs.end(), loptions,

                loptions.begin(), loptions.end());

    }

#else

    std::list<TString> loptions = options.ToList();

    vmargs.splice(vmargs.end(), loptions, loptions.begin(), loptions.end());

#endif

    std::list<TString> largs = package.GetArgs();

    vmargs.splice(vmargs.end(), largs, largs.begin(), largs.end());

    size_t argc = vmargs.size();

    DynamicBuffer<char*> argv(argc + 1);

    if (argv.GetData() == NULL) {

        return false;

    }

    unsigned int index = 0;

    for (std::list<TString>::const_iterator iterator = vmargs.begin();

        iterator != vmargs.end(); iterator++) {

        TString item = *iterator;

        std::string arg = PlatformString(item).toStdString();

#ifdef DEBUG

        printf("%i %s\n", index, arg.c_str());

#endif // DEBUG

        argv[index] = PlatformString::duplicate(arg.c_str());

        index++;

    }

    argv[argc] = NULL;

// On Mac we can only free the boot fields if the calling thread is

// not the main thread.

#ifdef MAC

    if (platform.IsMainThread() == false) {

        package.FreeBootFields();

    }

#else

    package.FreeBootFields();

#endif // MAC

    if (javaLibrary.JavaVMCreate(argc, argv.GetData()) == true) {

        return true;

    }

    for (index = 0; index < argc; index++) {

        if (argv[index] != NULL) {

            delete[] argv[index];

        }

    }

    return false;

}