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#include <QtGui>

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

   : QMainWindow(parent)

{

    setupUi(this);

    sampleSizes << 32 << 24 << 16 << 14 << 12 << 8 << 4 << 2 << 1;

    markedCount = 0;

    setupFontTree();

    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    connect(fontTree, SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),

            this, SLOT(showFont(QTreeWidgetItem *)));

    connect(fontTree, SIGNAL(itemChanged(QTreeWidgetItem *, int)),

            this, SLOT(updateStyles(QTreeWidgetItem *, int)));

    fontTree->setItemSelected(fontTree->topLevelItem(0), true);

    showFont(fontTree->topLevelItem(0));

}

void MainWindow::setupFontTree()

{

    QFontDatabase database;

    fontTree->setColumnCount(1);

    fontTree->setHeaderLabels(QStringList() << tr("Font"));

    foreach (QString family, database.families()) {

        const QStringList styles = database.styles(family);

        if (styles.isEmpty())

            continue;

        QTreeWidgetItem *familyItem = new QTreeWidgetItem(fontTree);

        familyItem->setText(0, family);

        familyItem->setCheckState(0, Qt::Unchecked);

        foreach (QString style, styles) {

            QTreeWidgetItem *styleItem = new QTreeWidgetItem(familyItem);

            styleItem->setText(0, style);

            styleItem->setCheckState(0, Qt::Unchecked);

            styleItem->setData(0, Qt::UserRole,

                QVariant(database.weight(family, style)));

            styleItem->setData(0, Qt::UserRole + 1,

                QVariant(database.italic(family, style)));

        }

    }

}

void MainWindow::on_clearAction_triggered()

{

    QTreeWidgetItem *currentItem = fontTree->currentItem();

    foreach (QTreeWidgetItem *item, fontTree->selectedItems())

        fontTree->setItemSelected(item, false);

    fontTree->setItemSelected(currentItem, true);

}

void MainWindow::on_markAction_triggered()

{

    markUnmarkFonts(Qt::Checked);

}

void MainWindow::on_unmarkAction_triggered()

{

    markUnmarkFonts(Qt::Unchecked);

}

void MainWindow::markUnmarkFonts(Qt::CheckState state)

{

    QList<QTreeWidgetItem *> items = fontTree->selectedItems();

    foreach (QTreeWidgetItem *item, items) {

        if (item->checkState(0) != state)

            item->setCheckState(0, state);

    }

}

void MainWindow::showFont(QTreeWidgetItem *item)

{

    if (!item)

        return;

    QString family;

    QString style;

    int weight;

    bool italic;

    if (item->parent()) {

        family = item->parent()->text(0);

        style = item->text(0);

        weight = item->data(0, Qt::UserRole).toInt();

        italic = item->data(0, Qt::UserRole + 1).toBool();

    } else {

        family = item->text(0);

        style = item->child(0)->text(0);

        weight = item->child(0)->data(0, Qt::UserRole).toInt();

        italic = item->child(0)->data(0, Qt::UserRole + 1).toBool();

    }

    QString oldText = textEdit->toPlainText().trimmed();

    bool modified = textEdit->document()->isModified();

    textEdit->clear();

    textEdit->document()->setDefaultFont(QFont(family, 32, weight, italic));

    QTextCursor cursor = textEdit->textCursor();

    QTextBlockFormat blockFormat;

    blockFormat.setAlignment(Qt::AlignCenter);

    cursor.insertBlock(blockFormat);

    if (modified)

        cursor.insertText(QString(oldText));

    else

        cursor.insertText(QString("%1 %2").arg(family).arg(style));

    textEdit->document()->setModified(modified);

}

void MainWindow::updateStyles(QTreeWidgetItem *item, int column)

{

    if (!item || column != 0)

        return;

    Qt::CheckState state = item->checkState(0);

    QTreeWidgetItem *parent = item->parent();

    if (parent) {

        // Only count style items.

        if (state == Qt::Checked)

            ++markedCount;

        else

            --markedCount;

        if (state == Qt::Checked &&

            parent->checkState(0) == Qt::Unchecked) {

            // Mark parent items when child items are checked.

            parent->setCheckState(0, Qt::Checked);

        } else if (state == Qt::Unchecked &&

                   parent->checkState(0) == Qt::Checked) {

            bool marked = false;

            for (int row = 0; row < parent->childCount(); ++row) {

                if (parent->child(row)->checkState(0) == Qt::Checked) {

                    marked = true;

                    break;

                }

            }

            // Unmark parent items when all child items are unchecked.

            if (!marked)

                parent->setCheckState(0, Qt::Unchecked);

        }

    } else {

        int row;

        int number = 0;

        for (row = 0; row < item->childCount(); ++row) {

            if (item->child(row)->checkState(0) == Qt::Checked)

                ++number;

        }

        // Mark/unmark all child items when marking/unmarking top-level

        // items.

        if (state == Qt::Checked && number == 0) {

            for (row = 0; row < item->childCount(); ++row) {

                if (item->child(row)->checkState(0) == Qt::Unchecked)

                    item->child(row)->setCheckState(0, Qt::Checked);

            }

        } else if (state == Qt::Unchecked && number > 0) {

            for (row = 0; row < item->childCount(); ++row) {

                if (item->child(row)->checkState(0) == Qt::Checked)

                    item->child(row)->setCheckState(0, Qt::Unchecked);

            }

        }

    }

    printAction->setEnabled(markedCount > 0);

    printPreviewAction->setEnabled(markedCount > 0);

}

void MainWindow::on_printAction_triggered()

{

    pageMap = currentPageMap();

    if (pageMap.count() == 0)

        return;

    QPrinter printer(QPrinter::HighResolution);

    QPrintDialog dialog(&printer, this);

    if (dialog.exec() != QDialog::Accepted)

        return;

    int from = printer.fromPage();

    int to = printer.toPage();

    if (from <= 0 && to <= 0)

        printer.setFromTo(1, pageMap.keys().count());

    printDocument(&printer);

}

void MainWindow::printDocument(QPrinter *printer)

{

    printer->setFromTo(1, pageMap.count());

    QProgressDialog progress(tr("Preparing font samples..."), tr("&Cancel"),

                             0, pageMap.count(), this);

    progress.setWindowModality(Qt::ApplicationModal);

    progress.setWindowTitle(tr("Font Sampler"));

    progress.setMinimum(printer->fromPage() - 1);

    progress.setMaximum(printer->toPage());

    QPainter painter;

    painter.begin(printer);

    bool firstPage = true;

    for (int page = printer->fromPage(); page <= printer->toPage(); ++page) {

        if (!firstPage)

            printer->newPage();

        qApp->processEvents();

        if (progress.wasCanceled())

            break;

        printPage(page - 1, &painter, printer);

        progress.setValue(page);

        firstPage = false;

    }

    painter.end();

}

void MainWindow::on_printPreviewAction_triggered()

{

    pageMap = currentPageMap();

    if (pageMap.count() == 0)

        return;

    QPrinter printer(QPrinter::HighResolution);

    QPrintPreviewDialog preview(&printer, this);

    connect(&preview, SIGNAL(paintRequested(QPrinter *)),

            this, SLOT(printDocument(QPrinter *)));

    preview.exec();

}

QMap<QString, StyleItems> MainWindow::currentPageMap()

{

    QMap<QString, StyleItems> pageMap;

    for (int row = 0; row < fontTree->topLevelItemCount(); ++row) {

        QTreeWidgetItem *familyItem = fontTree->topLevelItem(row);

        QString family;

        if (familyItem->checkState(0) == Qt::Checked) {

            family = familyItem->text(0);

            pageMap[family] = StyleItems();

        }

        for (int childRow = 0; childRow < familyItem->childCount(); ++childRow) {

            QTreeWidgetItem *styleItem = familyItem->child(childRow);

            if (styleItem->checkState(0) == Qt::Checked)

                pageMap[family].append(styleItem);

        }

    }

    return pageMap;

}

void MainWindow::printPage(int index, QPainter *painter, QPrinter *printer)

{

    QString family = pageMap.keys()[index];

    StyleItems items = pageMap[family];

    // Find the dimensions of the text on each page.

    qreal width = 0.0;

    qreal height = 0.0;

    foreach (QTreeWidgetItem *item, items) {

        QString style = item->text(0);

        int weight = item->data(0, Qt::UserRole).toInt();

        bool italic = item->data(0, Qt::UserRole + 1).toBool();

        // Calculate the maximum width and total height of the text.

        foreach (int size, sampleSizes) {

            QFont font(family, size, weight, italic);

            font = QFont(font, painter->device());

            QFontMetricsF fontMetrics(font);

            QRectF rect = fontMetrics.boundingRect(

            QString("%1 %2").arg(family).arg(style));

            width = qMax(rect.width(), width);

            height += rect.height();

        }

    }

    qreal xScale = printer->pageRect().width() / width;

    qreal yScale = printer->pageRect().height() / height;

    qreal scale = qMin(xScale, yScale);

    qreal remainingHeight = printer->pageRect().height()/scale - height;

    qreal spaceHeight = (remainingHeight/4.0) / (items.count() + 1);

    qreal interLineHeight = (remainingHeight/4.0) / (sampleSizes.count() * items.count());

    painter->save();

    painter->translate(printer->pageRect().width()/2.0, printer->pageRect().height()/2.0);

    painter->scale(scale, scale);

    painter->setBrush(QBrush(Qt::black));

    qreal x = -width/2.0;

    qreal y = -height/2.0 - remainingHeight/4.0 + spaceHeight;

    foreach (QTreeWidgetItem *item, items) {

        QString style = item->text(0);

        int weight = item->data(0, Qt::UserRole).toInt();

        bool italic = item->data(0, Qt::UserRole + 1).toBool();

        // Draw each line of text.

        foreach (int size, sampleSizes) {

            QFont font(family, size, weight, italic);

            font = QFont(font, painter->device());

            QFontMetricsF fontMetrics(font);

            QRectF rect = fontMetrics.boundingRect(QString("%1 %2").arg(

                          font.family()).arg(style));

            y += rect.height();

            painter->setFont(font);

            painter->drawText(QPointF(x, y),

                             QString("%1 %2").arg(family).arg(style));

            y += interLineHeight;

        }

        y += spaceHeight;

    }

    painter->restore();

}