/* Copyright 2013-2021 MultiMC Contributors
 *
 * 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 "InstanceWindow.h"
#include "Application.h"

#include <QScrollBar>
#include <QMessageBox>
#include <QHBoxLayout>
#include <QPushButton>
#include <qlayoutitem.h>
#include <QCloseEvent>

#include "ui/dialogs/CustomMessageBox.h"
#include "ui/dialogs/ProgressDialog.h"
#include "ui/widgets/PageContainer.h"

#include "InstancePageProvider.h"

#include "icons/IconList.h"

InstanceWindow::InstanceWindow(InstancePtr instance, QWidget *parent)
    : QMainWindow(parent), m_instance(instance)
{
    setAttribute(Qt::WA_DeleteOnClose);

    auto icon = APPLICATION->icons()->getIcon(m_instance->iconKey());
    QString windowTitle = tr("Console window for ") + m_instance->name();

    // Set window properties
    {
        setWindowIcon(icon);
        setWindowTitle(windowTitle);
    }

    // Add page container
    {
        auto provider = std::make_shared<InstancePageProvider>(m_instance);
        m_container = new PageContainer(provider.get(), "console", this);
        m_container->setParentContainer(this);
        setCentralWidget(m_container);
        setContentsMargins(0, 0, 0, 0);
    }

    // Add custom buttons to the page container layout.
    {
        auto horizontalLayout = new QHBoxLayout();
        horizontalLayout->setObjectName(QStringLiteral("horizontalLayout"));
        horizontalLayout->setContentsMargins(6, -1, 6, -1);

        auto btnHelp = new QPushButton();
        btnHelp->setText(tr("Help"));
        horizontalLayout->addWidget(btnHelp);
        connect(btnHelp, SIGNAL(clicked(bool)), m_container, SLOT(help()));

        auto spacer = new QSpacerItem(40, 20, QSizePolicy::Expanding, QSizePolicy::Minimum);
        horizontalLayout->addSpacerItem(spacer);

        m_killButton = new QPushButton();
        horizontalLayout->addWidget(m_killButton);
        connect(m_killButton, SIGNAL(clicked(bool)), SLOT(on_btnKillMinecraft_clicked()));

        m_launchOfflineButton = new QPushButton();
        horizontalLayout->addWidget(m_launchOfflineButton);
        m_launchOfflineButton->setText(tr("Launch Offline"));
        updateLaunchButtons();
        connect(m_launchOfflineButton, SIGNAL(clicked(bool)), SLOT(on_btnLaunchMinecraftOffline_clicked()));

        m_closeButton = new QPushButton();
        m_closeButton->setText(tr("Close"));
        horizontalLayout->addWidget(m_closeButton);
        connect(m_closeButton, SIGNAL(clicked(bool)), SLOT(on_closeButton_clicked()));

        m_container->addButtons(horizontalLayout);
    }

    // restore window state
    {
        auto base64State = APPLICATION->settings()->get("ConsoleWindowState").toByteArray();
        restoreState(QByteArray::fromBase64(base64State));
        auto base64Geometry = APPLICATION->settings()->get("ConsoleWindowGeometry").toByteArray();
        restoreGeometry(QByteArray::fromBase64(base64Geometry));
    }

    // set up instance and launch process recognition
    {
        auto launchTask = m_instance->getLaunchTask();
        on_InstanceLaunchTask_changed(launchTask);
        connect(m_instance.get(), &BaseInstance::launchTaskChanged, this, &InstanceWindow::on_InstanceLaunchTask_changed);
        connect(m_instance.get(), &BaseInstance::runningStatusChanged, this, &InstanceWindow::on_RunningState_changed);
    }

    // set up instance destruction detection
    {
        connect(m_instance.get(), &BaseInstance::statusChanged, this, &InstanceWindow::on_instanceStatusChanged);
    }
    show();
}

void InstanceWindow::on_instanceStatusChanged(BaseInstance::Status, BaseInstance::Status newStatus)
{
    if(newStatus == BaseInstance::Status::Gone)
    {
        m_doNotSave = true;
        close();
    }
}

void InstanceWindow::updateLaunchButtons()
{
    if(m_instance->isRunning())
    {
        m_launchOfflineButton->setEnabled(false);
        m_killButton->setText(tr("Kill"));
        m_killButton->setObjectName("killButton");
        m_killButton->setToolTip(tr("Kill the running instance"));
    }
    else if(!m_instance->canLaunch())
    {
        m_launchOfflineButton->setEnabled(false);
        m_killButton->setText(tr("Launch"));
        m_killButton->setObjectName("launchButton");
        m_killButton->setToolTip(tr("Launch the instance"));
        m_killButton->setEnabled(false);
    }
    else
    {
        m_launchOfflineButton->setEnabled(true);
        m_killButton->setText(tr("Launch"));
        m_killButton->setObjectName("launchButton");
        m_killButton->setToolTip(tr("Launch the instance"));
    }
    // NOTE: this is a hack to force the button to recalculate its style
    m_killButton->setStyleSheet("/* */");
    m_killButton->setStyleSheet(QString());
}

void InstanceWindow::on_btnLaunchMinecraftOffline_clicked()
{
    APPLICATION->launch(m_instance, false, nullptr);
}

void InstanceWindow::on_InstanceLaunchTask_changed(shared_qobject_ptr<LaunchTask> proc)
{
    m_proc = proc;
}

void InstanceWindow::on_RunningState_changed(bool running)
{
    updateLaunchButtons();
    m_container->refreshContainer();
    if(running) {
        selectPage("log");
    }
}

void InstanceWindow::on_closeButton_clicked()
{
    close();
}

void InstanceWindow::closeEvent(QCloseEvent *event)
{
    bool proceed = true;
    if(!m_doNotSave)
    {
        proceed &= m_container->prepareToClose();
    }

    if(!proceed)
    {
        return;
    }

    APPLICATION->settings()->set("ConsoleWindowState", saveState().toBase64());
    APPLICATION->settings()->set("ConsoleWindowGeometry", saveGeometry().toBase64());
    emit isClosing();
    event->accept();
}

bool InstanceWindow::saveAll()
{
    return m_container->saveAll();
}

void InstanceWindow::on_btnKillMinecraft_clicked()
{
    if(m_instance->isRunning())
    {
        APPLICATION->kill(m_instance);
    }
    else
    {
        APPLICATION->launch(m_instance, true, nullptr);
    }
}

QString InstanceWindow::instanceId()
{
    return m_instance->id();
}

bool InstanceWindow::selectPage(QString pageId)
{
    return m_container->selectPage(pageId);
}

void InstanceWindow::refreshContainer()
{
    m_container->refreshContainer();
}

InstanceWindow::~InstanceWindow()
{
}

bool InstanceWindow::requestClose()
{
    if(m_container->prepareToClose())
    {
        close();
        return true;
    }
    return false;
}
