/*
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <QtGui>
#include <QtSvg>

#include "UBGraphicsTextItemDelegate.h"
#include "UBGraphicsScene.h"
#include "domain/UBGraphicsTextItem.h"
#include "domain/UBGraphicsDelegateFrame.h"
#include "core/UBSettings.h"

#include "core/UBApplication.h" // TODO UB 4.x clean that dependency
#include "core/UBApplicationController.h" // TODO UB 4.x clean that dependency
#include "core/UBDisplayManager.h" // TODO UB 4.x clean that dependency

#include "core/memcheck.h"

const int UBGraphicsTextItemDelegate::sMinPixelSize = 8;

UBGraphicsTextItemDelegate::UBGraphicsTextItemDelegate(UBGraphicsTextItem* pDelegated, QObject * parent)
    : UBGraphicsItemDelegate(pDelegated,0, parent, true)
    , mLastFontPixelSize(-1)
{
    // NOOP
}

UBGraphicsTextItemDelegate::~UBGraphicsTextItemDelegate()
{
    // NOOP
}


void UBGraphicsTextItemDelegate::buildButtons()
{
    UBGraphicsItemDelegate::buildButtons();

    mFontButton = new DelegateButton(":/images/font.svg", mDelegated, mFrame);
    mColorButton = new DelegateButton(":/images/color.svg", mDelegated, mFrame);
    mDecreaseSizeButton = new DelegateButton(":/images/minus.svg", mDelegated, mFrame);
    mIncreaseSizeButton = new DelegateButton(":/images/plus.svg", mDelegated, mFrame);

    connect(mFontButton, SIGNAL(clicked(bool)), this, SLOT(pickFont()));
    connect(mColorButton, SIGNAL(clicked(bool)), this, SLOT(pickColor()));
    connect(mDecreaseSizeButton, SIGNAL(clicked(bool)), this, SLOT(decreaseSize()));
    connect(mIncreaseSizeButton, SIGNAL(clicked(bool)), this, SLOT(increaseSize()));

    mButtons << mFontButton << mColorButton << mDecreaseSizeButton << mIncreaseSizeButton;
}


void UBGraphicsTextItemDelegate::contentsChanged()
{
    positionHandles();
    delegated()->contentsChanged();
}

// This method is used to filter the available fonts. Only the web-compliant fonts
// will remain in the font list.
void UBGraphicsTextItemDelegate::customize(QFontDialog &fontDialog)
{
    fontDialog.setOption(QFontDialog::DontUseNativeDialog);

    if (UBSettings::settings()->isDarkBackground())
    {
        fontDialog.setStyleSheet("background-color: white;");
    }

    QListView *fontNameListView;
    QList<QListView*> listViews = fontDialog.findChildren<QListView*>();
    if (listViews.count() > 0)
    {
        fontNameListView = listViews.at(0);
        foreach (QListView* listView, listViews)
        {
            if (listView->pos().x() < fontNameListView->pos().x())
                fontNameListView = listView;
        }
    }
    if (fontNameListView)
    {
        QStringListModel *stringListModel = dynamic_cast<QStringListModel*>(fontNameListView->model());
        if (stringListModel)
        {
            QStringList dialogFontNames = stringListModel->stringList();
            QStringList safeWebFontNames;
            safeWebFontNames.append("Arial");
            safeWebFontNames.append("Arial Black");
            safeWebFontNames.append("Comic Sans MS");
            //safeWebFontNames.append("Century Gothic"); Not available on OSX
            safeWebFontNames.append("Courier New");
            safeWebFontNames.append("Georgia");
            safeWebFontNames.append("Impact");
            safeWebFontNames.append("Times New Roman");
            safeWebFontNames.append("Trebuchet MS");
            safeWebFontNames.append("Verdana");
            int index = 0;
            foreach (QString dialogFontName, dialogFontNames)
            {
                if (safeWebFontNames.contains(dialogFontName, Qt::CaseInsensitive))
                    index++;
                else
                    stringListModel->removeRow(index);
            }
        }
    }

    QList<QComboBox*> comboBoxes = fontDialog.findChildren<QComboBox*>();
    if (comboBoxes.count() > 0)
        comboBoxes.at(0)->setEnabled(false);
}


void UBGraphicsTextItemDelegate::pickFont()
{
    if (mDelegated && mDelegated->scene() && mDelegated->scene()->views().size() > 0)
    {
        QFontDialog fontDialog(delegated()->font(), mDelegated->scene()->views().at(0));
        customize(fontDialog);

        if (fontDialog.exec())
        {
            QFont selectedFont = fontDialog.selectedFont();
            UBSettings::settings()->setFontFamily(selectedFont.family());
            QFontInfo fi(selectedFont);
            mLastFontPixelSize = fi.pixelSize();
            UBSettings::settings()->setFontPixelSize(mLastFontPixelSize);
            UBSettings::settings()->setBoldFont(selectedFont.bold());
            UBSettings::settings()->setItalicFont(selectedFont.italic());
            delegated()->setFont(selectedFont);
            delegated()->setSelected(true);

            delegated()->document()->adjustSize();
            delegated()->contentsChanged();
        }
    }
}


void UBGraphicsTextItemDelegate::pickColor()
{
    if (mDelegated && mDelegated->scene() && mDelegated->scene()->views().size() > 0)
    {
        QColorDialog colorDialog(delegated()->defaultTextColor(), mDelegated->scene()->views().at(0));
        colorDialog.setWindowTitle(tr("Text Color"));
        if (UBSettings::settings()->isDarkBackground())
        {
            colorDialog.setStyleSheet("background-color: white;");
        }

        if (colorDialog.exec())
        {
            QColor selectedColor = colorDialog.selectedColor();
            delegated()->setDefaultTextColor(selectedColor);
            delegated()->setColorOnDarkBackground(selectedColor);
            delegated()->setColorOnLightBackground(selectedColor);

            UBGraphicsTextItem::lastUsedTextColor = selectedColor;

            delegated()->setSelected(true);
            delegated()->contentsChanged();
        }
    }
}


void UBGraphicsTextItemDelegate::decreaseSize()
{
    QFontInfo fi(delegated()->font());
    int pixelSize = fi.pixelSize();
    if (-1 == mLastFontPixelSize)
        mLastFontPixelSize = pixelSize;

    int newPixelSize = sMinPixelSize;
    while (newPixelSize * 1.5 < pixelSize)
        newPixelSize *= 1.5;

    if (newPixelSize < mLastFontPixelSize && mLastFontPixelSize < pixelSize)
        newPixelSize = mLastFontPixelSize;

    if (pixelSize > newPixelSize)
    {
        QFont font = delegated()->font();
        font.setPixelSize(newPixelSize);
        delegated()->setFont(font);
        UBSettings::settings()->setFontPixelSize(newPixelSize);

        delegated()->document()->adjustSize();
        delegated()->contentsChanged();
    }

}


void UBGraphicsTextItemDelegate::increaseSize()
{
    QFontInfo fi(delegated()->font());
    int pixelSize = fi.pixelSize();
    if (-1 == mLastFontPixelSize)
        mLastFontPixelSize = pixelSize;

    int newPixelSize = sMinPixelSize;
    while (newPixelSize <= pixelSize)
        newPixelSize *= 1.5;

    if (pixelSize < mLastFontPixelSize && mLastFontPixelSize < newPixelSize)
        newPixelSize = mLastFontPixelSize;

    QFont font = delegated()->font();
    font.setPixelSize(newPixelSize);
    delegated()->setFont(font);
    UBSettings::settings()->setFontPixelSize(newPixelSize);

    delegated()->document()->adjustSize();
    delegated()->contentsChanged();

    qDebug() << newPixelSize;
}


UBGraphicsTextItem* UBGraphicsTextItemDelegate::delegated()
{
    return static_cast<UBGraphicsTextItem*>(mDelegated);
}