/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */

/*
    Rosegarden
    A MIDI and audio sequencer and musical notation editor.
    Copyright 2000-2022 the Rosegarden development team.
 
    Other copyrights also apply to some parts of this work.  Please
    see the AUTHORS file and individual file headers for details.
 
    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 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#define RG_MODULE_STRING "[PercussionPitchRuler]"

#include <QMouseEvent>
#include "PercussionPitchRuler.h"

#include "misc/Debug.h"
#include "misc/Strings.h"
#include "base/MidiProgram.h"
#include "gui/editors/matrix/MatrixView.h"
#include "gui/general/MidiPitchLabel.h"
#include "PitchRuler.h"
#include <QColor>
#include <QEvent>
#include <QFont>
#include <QFontMetrics>
#include <QPainter>
#include <QSize>
#include <QWidget>


namespace Rosegarden
{

PercussionPitchRuler::PercussionPitchRuler(QWidget *parent,
        QSharedPointer<const MidiKeyMapping> mapping,
        int lineSpacing) :
    PitchRuler(parent),
    m_mapping(mapping),
    m_lineSpacing(lineSpacing),
    m_mouseDown(false),
    m_highlightPitch(-1),
    m_lastHighlightPitch( -1)
{
    m_font = new QFont();
    m_font->setPixelSize(9);
    m_fontMetrics = new QFontMetrics(*m_font);
    //: Note to the translators: Don't translate literally.
    //: This string is never displayed but defines the largest width of the
    //: text (pitch and intrument name) in the percussion ruler.
    m_width =
        m_fontMetrics->boundingRect(tr("  A#2   Acoustic Bass Drum  ")).width();

    setMouseTracking(true);
}

QSize PercussionPitchRuler::sizeHint() const
{
    return QSize(m_width,
                 (m_lineSpacing + 1) * m_mapping->getPitchExtent());
}

QSize PercussionPitchRuler::minimumSizeHint() const
{
    return QSize(m_width, m_lineSpacing + 1);
}

void PercussionPitchRuler::paintEvent(QPaintEvent*)
{
    QPainter paint(this);

    paint.setFont(*m_font);

    int minPitch = m_mapping->getPitchForOffset(0);
    int extent = m_mapping->getPitchExtent();

    // Draw the ruler

    for (int i = 0; i < extent; ++i) {
        paint.drawLine(0, i * (m_lineSpacing + 1),
                       m_width, i * (m_lineSpacing + 1));
    }

    //: Note to the translators: Don't translate literally.
    //: This string is never displayed but defines the largest width of the
    //: pitch name in the percussion ruler text.
    int lw = m_fontMetrics->boundingRect(tr("A#2")).width();
    int offset = m_fontMetrics->ascent() + 1;

    for (int i = 0; i < extent; ++i) {

        MidiPitchLabel label(minPitch + i);
        std::string key = m_mapping->getMapForKeyName(minPitch + i);
        //RG_DEBUG << "PercussionPitchRuler::paintEvent()" << i << ": " << label.getQString() << ": " << key;

        int yi = (extent - i - 1) * (m_lineSpacing + 1) + offset;
        paint.drawText(2, yi, label.getQString());

        if (i != m_highlightPitch) {
            // Draw an unhighlighted note
            paint.drawText(9 + lw, yi, strtoqstr(key));
        } else {
            // Highlight the note
            int pitchDistance = m_highlightPitch - minPitch;
            int y = (extent - pitchDistance - 1) * (m_lineSpacing + 1);
            paint.save();
            paint.setBrush(paint.pen().color());
            paint.drawRect(lw + 7, y, m_width - lw, m_lineSpacing + 1);
            paint.setPen(QColor(Qt::black));
            std::string key = m_mapping->getMapForKeyName(m_highlightPitch);
            paint.drawText(9 + lw, y + offset, strtoqstr(key));
            paint.restore();
        }
    }

    if (m_lastHighlightPitch != m_highlightPitch) {
        m_lastHighlightPitch = m_highlightPitch;

        // Un-highlight the last highlighted note
        if (m_lastHighlightPitch >= 0) {
            int lastPitchDistance = m_lastHighlightPitch - minPitch;
            int y = (extent - lastPitchDistance - 1) * (m_lineSpacing + 1);
            paint.drawRect(lw + 7, y + 1, m_width - lw, m_lineSpacing);
            std::string key = m_mapping->getMapForKeyName(m_lastHighlightPitch);
            paint.setPen(QColor(Qt::black));
            paint.drawText(9 + lw, y + offset, strtoqstr(key));
        }
    }
}

#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
void PercussionPitchRuler::enterEvent(QEnterEvent *)
#else
void PercussionPitchRuler::enterEvent(QEvent *)
#endif
{}

void PercussionPitchRuler::leaveEvent(QEvent*)
{
    // Force currently highlighted note to be un-highlighted
    m_highlightPitch = -1;
    update();
}

void PercussionPitchRuler::showHighlight(int evPitch)
{
    m_highlightPitch = evPitch;
    update();
}

void PercussionPitchRuler::hideHighlight()
{
    // Force current highlighted note to be un-highlighted
    m_highlightPitch = -1;
    update();
}

void PercussionPitchRuler::mouseMoveEvent(QMouseEvent* e)
{
    if (m_mouseDown)
        if (m_selecting)
            emit keySelected(e->pos().y(), true);
        else
            emit keyPressed(e->pos().y(), true); // we're swooshing
    else
        emit hoveredOverKeyChanged(e->pos().y());
}

void PercussionPitchRuler::mousePressEvent(QMouseEvent *e)
{
    if (e->button() == Qt::LeftButton) {

        m_mouseDown = true;
        m_selecting = (e->modifiers() & Qt::ShiftModifier);

        if (m_selecting)
            emit keySelected(e->pos().y(), false);
        else
            emit keyPressed(e->pos().y(), false);
    }
}

void PercussionPitchRuler::mouseReleaseEvent(QMouseEvent *e)
{
    if (e->button() == Qt::LeftButton) {
        m_mouseDown = false;
        m_selecting = false;
        emit keyReleased(e->pos().y(), false);
    }
}

}
