/* -*- 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 2000-2023 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.
*/

#include "ControlPainter.h"

#include "base/BaseProperties.h"
#include "base/Event.h"
#include "base/Segment.h"
#include "base/Selection.h"
#include "base/SnapGrid.h"
#include "base/ViewElement.h"
#include "document/CommandHistory.h"
#include "ControlItem.h"
#include "ControlRuler.h"
#include "ControllerEventsRuler.h"
#include "ControlTool.h"
#include "ControlMouseEvent.h"
#include "misc/Debug.h"

#include <QCursor>

namespace Rosegarden
{

ControlPainter::ControlPainter(ControlRuler *parent) :
    ControlMover(parent, "ControlPainter")
{
    // Bug #1452 "Control ruler hand cursor is obnoxious"
    //
    // After attempting to puzzle through the cursor switching logic and work
    // out better logic or a more suitable alternative than Qt::OpenHandCursor,
    // I concluded that using the cross in all cases feels just fine in
    // practice.  I decided to just set them the same and leave the switching
    // logic in place, because it doesn't seem worth the effort to rip it all
    // out.
    m_overCursor = Qt::CrossCursor;
    m_notOverCursor = Qt::CrossCursor;
    m_controlLineOrigin.first = -1;
    m_controlLineOrigin.second = -1;
}

void
ControlPainter::handleLeftButtonPress(const ControlMouseEvent *e)
{
    if (e->itemList.size()) {
        ControllerEventsRuler *ruler = static_cast <ControllerEventsRuler*> (m_ruler);
        ControlItemVector::const_iterator it = e->itemList.begin();
        ruler->clearSelectedItems();
        ruler->addToSelection(*it);
        ruler->eraseControllerEvent();

        m_ruler->setCursor(Qt::CrossCursor);
    }
    else {
        // Make new control event here
        // This tool should not be applied to a PropertyControlRuler but in case it is
        ControllerEventsRuler* ruler = dynamic_cast <ControllerEventsRuler*>(m_ruler);
        //if (ruler) ruler->insertControllerEvent(e->x,e->y);
        if (ruler) {
            double xscale = m_ruler->getXScale();
            float xmin = m_ruler->getXMin() * xscale;
            float xmax = (m_ruler->getXMax() - 1) * xscale;
            // get the closest of snappedXLeft and snappedXRight
            float x = e->snappedXLeft;
            if ((e->x - e->snappedXLeft) > (e->snappedXRight - e->x)) {
                x = e->snappedXRight;
            }

            if (x < xmin) {
                x = xmin;
            } else if (x > xmax) {
                x = xmax;
            }

            // If shift was pressed, draw a line of controllers between the new
            // control event and the previous one
            if (e->modifiers & Qt::ShiftModifier) {

                // if Ctrl was pressed, do not erase existing controllers
                bool eraseExistingControllers = !(e->modifiers & Qt::ControlModifier);

                // if no origin point was set, do not draw a line
                if (m_controlLineOrigin.first != -1 && m_controlLineOrigin.second != -1) {
                    ruler->addControlLine(m_controlLineOrigin.first / xscale,
                                          m_controlLineOrigin.second,
                                          x / xscale,
                                          e->y,
                                          eraseExistingControllers);
                }
            } else {

                QSharedPointer<ControlItem> item =
                        ruler->addControlItem2(x,e->y);
                // ??? MEMORY LEAK (confirmed)
                ControlMouseEvent *newevent = new ControlMouseEvent(e);
                newevent->itemList.push_back(item);
                m_overItem = true;
                ControlMover::handleLeftButtonPress(newevent);
            }

            // Save these coordinates for next time
            m_controlLineOrigin.first = x;
            m_controlLineOrigin.second = e->y;
        }
    }

}

FollowMode
ControlPainter::handleMouseMove(const ControlMouseEvent *e)
{
    emit showContextHelp(tr("Click to set a value. Right click for grid options"));
    ControllerEventsRuler* ruler = dynamic_cast <ControllerEventsRuler*>(m_ruler);

    if (ruler) {
        if (e->modifiers & Qt::ShiftModifier) {

            // snap line
            // get the closest of snappedXLeft and snappedXRight
            float x = e->snappedXLeft;
            if ((e->x - e->snappedXLeft) > (e->snappedXRight - e->x)) {
                x = e->snappedXRight;
            }

            if (m_controlLineOrigin.first != -1 && m_controlLineOrigin.second != -1) {
                ruler->drawRubberBand(m_controlLineOrigin.first,
                                      m_controlLineOrigin.second,
                                      x,
                                      e->y);
            }
        } else {
            ruler->stopRubberBand();
        }
    }

    // not sure what any of this is about; had to match the return type used
    // elsewhere, and have made no investigation into what any of it means
    return NO_FOLLOW;
}

QString ControlPainter::ToolName() { return "painter"; }
}
