#include "JavaSettingsWidget.h"

#include <QVBoxLayout>
#include <QGroupBox>
#include <QSpinBox>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>
#include <QToolButton>
#include <QFileDialog>

#include <sys.h>

#include "java/JavaInstall.h"
#include "java/JavaUtils.h"
#include "FileSystem.h"

#include "ui/dialogs/CustomMessageBox.h"
#include "ui/widgets/VersionSelectWidget.h"

#include "Application.h"
#include "BuildConfig.h"

JavaSettingsWidget::JavaSettingsWidget(QWidget* parent) : QWidget(parent)
{
    m_availableMemory = Sys::getSystemRam() / Sys::mebibyte;

    goodIcon = APPLICATION->getThemedIcon("status-good");
    yellowIcon = APPLICATION->getThemedIcon("status-yellow");
    badIcon = APPLICATION->getThemedIcon("status-bad");
    setupUi();

    connect(m_minMemSpinBox, SIGNAL(valueChanged(int)), this, SLOT(memoryValueChanged(int)));
    connect(m_maxMemSpinBox, SIGNAL(valueChanged(int)), this, SLOT(memoryValueChanged(int)));
    connect(m_permGenSpinBox, SIGNAL(valueChanged(int)), this, SLOT(memoryValueChanged(int)));
    connect(m_versionWidget, &VersionSelectWidget::selectedVersionChanged, this, &JavaSettingsWidget::javaVersionSelected);
    connect(m_javaBrowseBtn, &QPushButton::clicked, this, &JavaSettingsWidget::on_javaBrowseBtn_clicked);
    connect(m_javaPathTextBox, &QLineEdit::textEdited, this, &JavaSettingsWidget::javaPathEdited);
    connect(m_javaStatusBtn, &QToolButton::clicked, this, &JavaSettingsWidget::on_javaStatusBtn_clicked);
}

void JavaSettingsWidget::setupUi()
{
    setObjectName(QStringLiteral("javaSettingsWidget"));
    m_verticalLayout = new QVBoxLayout(this);
    m_verticalLayout->setObjectName(QStringLiteral("verticalLayout"));

    m_versionWidget = new VersionSelectWidget(this);
    m_verticalLayout->addWidget(m_versionWidget);

    m_horizontalLayout = new QHBoxLayout();
    m_horizontalLayout->setObjectName(QStringLiteral("horizontalLayout"));
    m_javaPathTextBox = new QLineEdit(this);
    m_javaPathTextBox->setObjectName(QStringLiteral("javaPathTextBox"));

    m_horizontalLayout->addWidget(m_javaPathTextBox);

    m_javaBrowseBtn = new QPushButton(this);
    m_javaBrowseBtn->setObjectName(QStringLiteral("javaBrowseBtn"));

    m_horizontalLayout->addWidget(m_javaBrowseBtn);

    m_javaStatusBtn = new QToolButton(this);
    m_javaStatusBtn->setIcon(yellowIcon);
    m_horizontalLayout->addWidget(m_javaStatusBtn);

    m_verticalLayout->addLayout(m_horizontalLayout);

    m_memoryGroupBox = new QGroupBox(this);
    m_memoryGroupBox->setObjectName(QStringLiteral("memoryGroupBox"));
    m_gridLayout_2 = new QGridLayout(m_memoryGroupBox);
    m_gridLayout_2->setObjectName(QStringLiteral("gridLayout_2"));

    m_labelMinMem = new QLabel(m_memoryGroupBox);
    m_labelMinMem->setObjectName(QStringLiteral("labelMinMem"));
    m_gridLayout_2->addWidget(m_labelMinMem, 0, 0, 1, 1);

    m_minMemSpinBox = new QSpinBox(m_memoryGroupBox);
    m_minMemSpinBox->setObjectName(QStringLiteral("minMemSpinBox"));
    m_minMemSpinBox->setSuffix(QStringLiteral(" MiB"));
    m_minMemSpinBox->setMinimum(128);
    m_minMemSpinBox->setMaximum(m_availableMemory);
    m_minMemSpinBox->setSingleStep(128);
    m_labelMinMem->setBuddy(m_minMemSpinBox);
    m_gridLayout_2->addWidget(m_minMemSpinBox, 0, 1, 1, 1);

    m_labelMaxMem = new QLabel(m_memoryGroupBox);
    m_labelMaxMem->setObjectName(QStringLiteral("labelMaxMem"));
    m_gridLayout_2->addWidget(m_labelMaxMem, 1, 0, 1, 1);

    m_maxMemSpinBox = new QSpinBox(m_memoryGroupBox);
    m_maxMemSpinBox->setObjectName(QStringLiteral("maxMemSpinBox"));
    m_maxMemSpinBox->setSuffix(QStringLiteral(" MiB"));
    m_maxMemSpinBox->setMinimum(128);
    m_maxMemSpinBox->setMaximum(m_availableMemory);
    m_maxMemSpinBox->setSingleStep(128);
    m_labelMaxMem->setBuddy(m_maxMemSpinBox);
    m_gridLayout_2->addWidget(m_maxMemSpinBox, 1, 1, 1, 1);

    m_labelPermGen = new QLabel(m_memoryGroupBox);
    m_labelPermGen->setObjectName(QStringLiteral("labelPermGen"));
    m_labelPermGen->setText(QStringLiteral("PermGen:"));
    m_gridLayout_2->addWidget(m_labelPermGen, 2, 0, 1, 1);
    m_labelPermGen->setVisible(false);

    m_permGenSpinBox = new QSpinBox(m_memoryGroupBox);
    m_permGenSpinBox->setObjectName(QStringLiteral("permGenSpinBox"));
    m_permGenSpinBox->setSuffix(QStringLiteral(" MiB"));
    m_permGenSpinBox->setMinimum(64);
    m_permGenSpinBox->setMaximum(m_availableMemory);
    m_permGenSpinBox->setSingleStep(8);
    m_gridLayout_2->addWidget(m_permGenSpinBox, 2, 1, 1, 1);
    m_permGenSpinBox->setVisible(false);

    m_verticalLayout->addWidget(m_memoryGroupBox);

    retranslate();
}

void JavaSettingsWidget::initialize()
{
    m_versionWidget->initialize(APPLICATION->javalist().get());
    m_versionWidget->setResizeOn(2);
    auto s = APPLICATION->settings();
    // Memory
    observedMinMemory = s->get("MinMemAlloc").toInt();
    observedMaxMemory = s->get("MaxMemAlloc").toInt();
    observedPermGenMemory = s->get("PermGen").toInt();
    m_minMemSpinBox->setValue(observedMinMemory);
    m_maxMemSpinBox->setValue(observedMaxMemory);
    m_permGenSpinBox->setValue(observedPermGenMemory);
}

void JavaSettingsWidget::refresh()
{
    m_versionWidget->loadList();
}

JavaSettingsWidget::ValidationStatus JavaSettingsWidget::validate()
{
    switch(javaStatus)
    {
        default:
        case JavaStatus::NotSet:
        case JavaStatus::DoesNotExist:
        case JavaStatus::DoesNotStart:
        case JavaStatus::ReturnedInvalidData:
        {
            int button = CustomMessageBox::selectable(
                this,
                tr("No Java version selected"),
                tr("You didn't select a Java version or selected something that doesn't work.\n"
                    "%1 will not be able to start Minecraft.\n"
                    "Do you wish to proceed without any Java?"
                    "\n\n"
                    "You can change the Java version in the settings later.\n"
                ).arg(BuildConfig.LAUNCHER_NAME),
                QMessageBox::Warning,
                QMessageBox::Yes | QMessageBox::No,
                QMessageBox::NoButton
            )->exec();
            if(button == QMessageBox::No)
            {
                return ValidationStatus::Bad;
            }
            return ValidationStatus::JavaBad;
        }
        break;
        case JavaStatus::Pending:
        {
            return ValidationStatus::Bad;
        }
        case JavaStatus::Good:
        {
            return ValidationStatus::AllOK;
        }
    }
}

QString JavaSettingsWidget::javaPath() const
{
    return m_javaPathTextBox->text();
}

int JavaSettingsWidget::maxHeapSize() const
{
    return m_maxMemSpinBox->value();
}

int JavaSettingsWidget::minHeapSize() const
{
    return m_minMemSpinBox->value();
}

bool JavaSettingsWidget::permGenEnabled() const
{
    return m_permGenSpinBox->isVisible();
}

int JavaSettingsWidget::permGenSize() const
{
    return m_permGenSpinBox->value();
}

void JavaSettingsWidget::memoryValueChanged(int)
{
    bool actuallyChanged = false;
    int min = m_minMemSpinBox->value();
    int max = m_maxMemSpinBox->value();
    int permgen = m_permGenSpinBox->value();
    QObject *obj = sender();
    if (obj == m_minMemSpinBox && min != observedMinMemory)
    {
        observedMinMemory = min;
        actuallyChanged = true;
        if (min > max)
        {
            observedMaxMemory = min;
            m_maxMemSpinBox->setValue(min);
        }
    }
    else if (obj == m_maxMemSpinBox && max != observedMaxMemory)
    {
        observedMaxMemory = max;
        actuallyChanged = true;
        if (min > max)
        {
            observedMinMemory = max;
            m_minMemSpinBox->setValue(max);
        }
    }
    else if (obj == m_permGenSpinBox && permgen != observedPermGenMemory)
    {
        observedPermGenMemory = permgen;
        actuallyChanged = true;
    }
    if(actuallyChanged)
    {
        checkJavaPathOnEdit(m_javaPathTextBox->text());
    }
}

void JavaSettingsWidget::javaVersionSelected(BaseVersionPtr version)
{
    auto java = std::dynamic_pointer_cast<JavaInstall>(version);
    if(!java)
    {
        return;
    }
    auto visible = java->id.requiresPermGen();
    m_labelPermGen->setVisible(visible);
    m_permGenSpinBox->setVisible(visible);
    m_javaPathTextBox->setText(java->path);
    checkJavaPath(java->path);
}

void JavaSettingsWidget::on_javaBrowseBtn_clicked()
{
    QString filter;
#if defined Q_OS_WIN32
    filter = "Java (javaw.exe)";
#else
    filter = "Java (java)";
#endif
    QString raw_path = QFileDialog::getOpenFileName(this, tr("Find Java executable"), QString(), filter);
    if(raw_path.isEmpty())
    {
        return;
    }
    QString cooked_path = FS::NormalizePath(raw_path);
    m_javaPathTextBox->setText(cooked_path);
    checkJavaPath(cooked_path);
}

void JavaSettingsWidget::on_javaStatusBtn_clicked()
{
    QString text;
    bool failed = false;
    switch(javaStatus)
    {
        case JavaStatus::NotSet:
            checkJavaPath(m_javaPathTextBox->text());
            return;
        case JavaStatus::DoesNotExist:
            text += QObject::tr("The specified file either doesn't exist or is not a proper executable.");
            failed = true;
            break;
        case JavaStatus::DoesNotStart:
        {
            text += QObject::tr("The specified Java binary didn't start properly.<br />");
            auto htmlError = m_result.errorLog;
            if(!htmlError.isEmpty())
            {
                htmlError.replace('\n', "<br />");
                text += QString("<font color=\"red\">%1</font>").arg(htmlError);
            }
            failed = true;
            break;
        }
        case JavaStatus::ReturnedInvalidData:
        {
            text += QObject::tr("The specified Java binary returned unexpected results:<br />");
            auto htmlOut = m_result.outLog;
            if(!htmlOut.isEmpty())
            {
                htmlOut.replace('\n', "<br />");
                text += QString("<font color=\"red\">%1</font>").arg(htmlOut);
            }
            failed = true;
            break;
        }
        case JavaStatus::Good:
            text += QObject::tr("Java test succeeded!<br />Platform reported: %1<br />Java version "
                "reported: %2<br />").arg(m_result.realPlatform, m_result.javaVersion.toString());
            break;
        case JavaStatus::Pending:
            // TODO: abort here?
            return;
    }
    CustomMessageBox::selectable(
        this,
        failed ? QObject::tr("Java test failure") : QObject::tr("Java test success"),
        text,
        failed ? QMessageBox::Critical : QMessageBox::Information
    )->show();
}

void JavaSettingsWidget::setJavaStatus(JavaSettingsWidget::JavaStatus status)
{
    javaStatus = status;
    switch(javaStatus)
    {
        case JavaStatus::Good:
            m_javaStatusBtn->setIcon(goodIcon);
            break;
        case JavaStatus::NotSet:
        case JavaStatus::Pending:
            m_javaStatusBtn->setIcon(yellowIcon);
            break;
        default:
            m_javaStatusBtn->setIcon(badIcon);
            break;
    }
}

void JavaSettingsWidget::javaPathEdited(const QString& path)
{
    checkJavaPathOnEdit(path);
}

void JavaSettingsWidget::checkJavaPathOnEdit(const QString& path)
{
    auto realPath = FS::ResolveExecutable(path);
    QFileInfo pathInfo(realPath);
    if (pathInfo.baseName().toLower().contains("java"))
    {
        checkJavaPath(path);
    }
    else
    {
        if(!m_checker)
        {
            setJavaStatus(JavaStatus::NotSet);
        }
    }
}

void JavaSettingsWidget::checkJavaPath(const QString &path)
{
    if(m_checker)
    {
        queuedCheck = path;
        return;
    }
    auto realPath = FS::ResolveExecutable(path);
    if(realPath.isNull())
    {
        setJavaStatus(JavaStatus::DoesNotExist);
        return;
    }
    setJavaStatus(JavaStatus::Pending);
    m_checker.reset(new JavaChecker());
    m_checker->m_path = path;
    m_checker->m_minMem = m_minMemSpinBox->value();
    m_checker->m_maxMem = m_maxMemSpinBox->value();
    if(m_permGenSpinBox->isVisible())
    {
        m_checker->m_permGen = m_permGenSpinBox->value();
    }
    connect(m_checker.get(), &JavaChecker::checkFinished, this, &JavaSettingsWidget::checkFinished);
    m_checker->performCheck();
}

void JavaSettingsWidget::checkFinished(JavaCheckResult result)
{
    m_result = result;
    switch(result.validity)
    {
        case JavaCheckResult::Validity::Valid:
        {
            setJavaStatus(JavaStatus::Good);
            break;
        }
        case JavaCheckResult::Validity::ReturnedInvalidData:
        {
            setJavaStatus(JavaStatus::ReturnedInvalidData);
            break;
        }
        case JavaCheckResult::Validity::Errored:
        {
            setJavaStatus(JavaStatus::DoesNotStart);
            break;
        }
    }
    m_checker.reset();
    if(!queuedCheck.isNull())
    {
        checkJavaPath(queuedCheck);
        queuedCheck.clear();
    }
}

void JavaSettingsWidget::retranslate()
{
    m_memoryGroupBox->setTitle(tr("Memory"));
    m_maxMemSpinBox->setToolTip(tr("The maximum amount of memory Minecraft is allowed to use."));
    m_labelMinMem->setText(tr("Minimum memory allocation:"));
    m_labelMaxMem->setText(tr("Maximum memory allocation:"));
    m_minMemSpinBox->setToolTip(tr("The amount of memory Minecraft is started with."));
    m_permGenSpinBox->setToolTip(tr("The amount of memory available to store loaded Java classes."));
    m_javaBrowseBtn->setText(tr("Browse"));
}
