/* Copyright 2013 MultiMC Contributors
 *
 * Authors: Orochimarufan <orochimarufan.x3@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "minecraftprocess.h"

#include <QDataStream>
#include <QFile>
#include <QDir>
#include <QImage>
#include <QProcessEnvironment>

#include "instance.h"

#include "osutils.h"
#include "pathutils.h"

#define LAUNCHER_FILE "MultiMCLauncher.jar"
#define IBUS "@im=ibus"

// commandline splitter
QStringList MinecraftProcess::splitArgs(QString args)
{
    QStringList argv;
    QString current;
    bool escape = false;
    QChar inquotes;
    for (int i=0; i<args.length(); i++)
    {
        QChar cchar = args.at(i);

        // \ escaped
        if (escape) {
            current += cchar;
            escape = false;
        // in "quotes"
        } else if (!inquotes.isNull()) {
            if (cchar == 0x5C)
                escape = true;
            else if (cchar == inquotes)
                inquotes = 0;
            else
                current += cchar;
        // otherwise
        } else {
            if (cchar == 0x20) {
                if (!current.isEmpty()) {
                    argv << current;
                    current.clear();
                }
            } else if (cchar == 0x22 || cchar == 0x27)
                inquotes = cchar;
            else
                current += cchar;
        }
    }
    if (!current.isEmpty())
        argv << current;
    return argv;
}

// prepare tools
inline void MinecraftProcess::extractIcon(InstancePtr inst, QString destination)
{
    QImage(":/icons/instances/" + inst->iconKey()).save(destination);
}

inline void MinecraftProcess::extractLauncher(QString destination)
{
    QFile(":/launcher/launcher.jar").copy(destination);
}

void MinecraftProcess::prepare(InstancePtr inst)
{
    extractLauncher(PathCombine(inst->minecraftDir(), LAUNCHER_FILE));
    extractIcon(inst, PathCombine(inst->minecraftDir(), "icon.png"));
}

// constructor
MinecraftProcess::MinecraftProcess(InstancePtr inst, QString user, QString session, ConsoleWindow *console) :
    m_instance(inst), m_user(user), m_session(session), m_console(console)
{
    connect(this, SIGNAL(finished(int, QProcess::ExitStatus)), SLOT(finish(int, QProcess::ExitStatus)));

    // prepare the process environment
    QProcessEnvironment env = QProcessEnvironment::systemEnvironment();

#ifdef LINUX
    // Strip IBus
    if (env.value("XMODIFIERS").contains(IBUS))
        env.insert("XMODIFIERS", env.value("XMODIFIERS").replace(IBUS, ""));
#endif

    // export some infos
    env.insert("INST_NAME", inst->name());
    env.insert("INST_ID", inst->id());
    env.insert("INST_DIR", QDir(inst->rootDir()).absolutePath());

    this->setProcessEnvironment(env);
    m_prepostlaunchprocess.setProcessEnvironment(env);

    // set the cwd
    QDir mcDir(inst->minecraftDir());
    this->setWorkingDirectory(mcDir.absolutePath());
    m_prepostlaunchprocess.setWorkingDirectory(mcDir.absolutePath());

    //TODO: do console redirection
}

void MinecraftProcess::finish(int code, ExitStatus status)
{
    if (status != NormalExit)
    {
        //TODO: error handling
    }

    m_prepostlaunchprocess.processEnvironment().insert("INST_EXITCODE", QString(code));

    // run post-exit
    if (!m_instance->getPostExitCommand().isEmpty())
    {
        m_prepostlaunchprocess.start(m_instance->getPostExitCommand());
        m_prepostlaunchprocess.waitForFinished();
        if (m_prepostlaunchprocess.exitStatus() != NormalExit)
        {
            //TODO: error handling
        }
    }

    emit ended();
}

void MinecraftProcess::launch()
{
    if (!m_instance->getPreLaunchCommand().isEmpty())
    {
        m_prepostlaunchprocess.start(m_instance->getPreLaunchCommand());
        m_prepostlaunchprocess.waitForFinished();
        if (m_prepostlaunchprocess.exitStatus() != NormalExit)
        {
            //TODO: error handling
            return;
        }
    }

    m_instance->setLastLaunch();

    prepare(m_instance);

    genArgs();

    qDebug("Minecraft folder is: '%s'", qPrintable(workingDirectory()));
    qDebug("Instance launched with arguments: '%s'", qPrintable(m_arguments.join("' '")));

    start(m_instance->getJavaPath(), m_arguments);
    if (!waitForStarted())
    {
        //TODO: error handling
    }
}

void MinecraftProcess::genArgs()
{
    // start fresh
    m_arguments.clear();

    // window size
    QString windowSize;
    if (m_instance->getLaunchMaximized())
        windowSize = "max";
    else
        windowSize = QString("%1x%2").arg(m_instance->getMinecraftWinWidth()).arg(m_instance->getMinecraftWinHeight());

    // window title
    QString windowTitle;
    windowTitle.append("MultiMC: ").append(m_instance->name());

    // Java arguments
    m_arguments.append(splitArgs(m_instance->getJvmArgs()));

#ifdef OSX
    // OSX dock icon and name
    m_arguments << "-Xdock:icon=icon.png";
    m_arguments << QString("-Xdock:name=\"%1\"").arg(windowTitle);
#endif

    // lwjgl
    QString lwjgl = m_instance->lwjglVersion();
    if (lwjgl != "Mojang")
        lwjgl = QDir(settings->getLWJGLDir() + "/" + lwjgl).absolutePath();

    // launcher arguments
    m_arguments << QString("-Xms%1m").arg(m_instance->getMinMemAlloc());
    m_arguments << QString("-Xmx%1m").arg(m_instance->getMaxMemAlloc());
    m_arguments << "-jar" << LAUNCHER_FILE;
    m_arguments << m_user;
    m_arguments << m_session;
    m_arguments << windowTitle;
    m_arguments << windowSize;
    m_arguments << lwjgl;
}