// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#include "printout.h"

#include <QPrinter>
#include <QFontMetrics>

QT_BEGIN_NAMESPACE

using namespace Qt::StringLiterals;

PrintOut::PrintOut(QPrinter *printer)
    : pr(printer), nextRule(NoRule), page(0)
{
    p.begin(pr);
    QFont f(QStringList{u"Arial"_s});
    f8 = f;
    f8.setPointSize(8);
    f10 = f;
    f10.setPointSize(10);
    p.setFont(f10);
    fmetrics = new QFontMetrics(p.fontMetrics());
    hmargin = 5 * printer->width() / printer->widthMM(); // 5 mm
    vmargin = 5 * printer->height() / printer->heightMM(); // 5 mm
    hsize = printer->width() - 2 * hmargin;
    vsize = printer->height() - vmargin;
    dateTime = QDateTime::currentDateTime();
    breakPage(true); // init vsize and draw first header
    cp = Paragraph(QPoint(hmargin, voffset));
}

PrintOut::~PrintOut()
{
    flushLine();
    delete fmetrics;
    p.end();
}

void PrintOut::setRule(Rule rule)
{
    if (nextRule < rule)
        nextRule = rule;
}

void PrintOut::setGuide(const QString &guide)
{
    g = guide;
}

void PrintOut::vskip()
{
    if (!firstParagraph)
        voffset += 14;
}

void PrintOut::flushLine(bool /* mayBreak */)
{
    if (voffset + cp.rect.height() > vsize)
        breakPage();
    else if (!firstParagraph)
        drawRule(nextRule);

    for (int i = 0; i < cp.boxes.size(); ++i) {
        Box b = cp.boxes[i];
        b.rect.translate(0, voffset);
        QRect r = b.rect;
        p.setFont(b.font);
        p.drawText(r, b.text, b.options);
    }
    voffset += cp.rect.height();

    nextRule = NoRule;
    cp = Paragraph(QPoint(hmargin, voffset));
    firstParagraph = false;
}

void PrintOut::addBox(int percent, const QString &text, Style style, Qt::Alignment halign)
{
    QTextOption options;
    options.setAlignment(halign | Qt::AlignTop);
    options.setWrapMode(QTextOption::WrapAtWordBoundaryOrAnywhere);
    QFont f = f10;
    if (style == Strong)
        f.setBold(true);
    else if (style == Emphasis)
        f.setItalic(true);
    int wd = hsize * percent / 100;
    QRect r(cp.rect.x() + cp.rect.width(), 0, wd, vsize);
    const int ht = static_cast<int>(p.boundingRect(r, text, options).height());

    Box b(r, text, f, options);
    cp.boxes.append(b);
    cp.rect.setSize(QSize(cp.rect.width() + wd, qMax(cp.rect.height(), ht)));
}

// use init if initial vsize should be calculated (first breakPage call)
void PrintOut::breakPage(bool init)
{
    static const int LeftAlign = Qt::AlignLeft | Qt::AlignTop;
    static const int RightAlign = Qt::AlignRight | Qt::AlignTop;
    QRect r1, r2;
    int h1 = 0;
    int h2 = 0;

    if (page > 0)
        pr->newPage();

    if (!init)
        page++;

    voffset = 0;

    p.setFont(f10);
    r1 = QRect(hmargin, voffset, 3 * hsize / 4, vsize);
    r2 = QRect(r1.x() + r1.width(), voffset, hsize - r1.width(), vsize);
    h1 = p.boundingRect(r1, LeftAlign, pr->docName()).height();
    if (!init)
        p.drawText(r1, LeftAlign, pr->docName());
    h2 = p.boundingRect(r2, RightAlign, QString::number(page)).height();
    if (!init)
        p.drawText(r2, RightAlign, QString::number(page));
    voffset += qMax(h1, h2 );

    r1 = QRect(hmargin, voffset, hsize / 2, LeftAlign);
    p.setFont(f8);
    h1 = p.boundingRect(r1, LeftAlign, dateTime.toString()).height();
    if (!init)
        p.drawText(r1, LeftAlign, dateTime.toString());
    p.setFont(f10);
    voffset += qMax(h1, h2);

    voffset += 4;
    if (!init)
        p.drawLine(QPoint(hmargin, voffset), QPoint(hmargin + hsize, voffset));
    voffset += 14;

    firstParagraph = true;

    if (init) {
        vsize -= voffset;
        breakPage(); // now draw it when the vsize is ok
    }

}

void PrintOut::drawRule(Rule rule)
{
    QPen pen;

    switch (rule) {
    case NoRule:
        voffset += 5;
        break;
    case ThinRule:
        pen.setColor(QColor(192, 192, 192));
        pen.setStyle(Qt::DotLine);
        pen.setWidth(0);
        p.setPen(pen);
        voffset += 5;
        p.drawLine(QPoint(hmargin, voffset),
                   QPoint(hmargin + hsize, voffset));
        p.setPen(QPen());
        voffset += 2;
        break;
    case ThickRule:
        voffset += 7;
        p.drawLine(QPoint(hmargin, voffset),
                   QPoint(hmargin + hsize, voffset));
        voffset += 4;
    }
}

QT_END_NAMESPACE