/****************************************************************************
**
** This file is part of the LibreCAD project, a 2D CAD program
**
** Copyright (C) 2010 R. van Twisk (librecad@rvt.dds.nl)
** Copyright (C) 2001-2003 RibbonSoft. All rights reserved.
**
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file gpl-2.0.txt included in the
** packaging of this file.
**
** 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, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
**
** This copyright notice MUST APPEAR in all copies of the script!
**
**********************************************************************/
#include<cmath>
#include <QAction>
#include <QMouseEvent>
#include "rs_actiondrawellipseaxis.h"

#include "rs_dialogfactory.h"
#include "rs_graphicview.h"
#include "rs_commandevent.h"
#include "rs_ellipse.h"
#include "rs_line.h"
#include "rs_coordinateevent.h"
#include "rs_math.h"
#include "rs_preview.h"
#include "rs_debug.h"

struct RS_ActionDrawEllipseAxis::Points {
	/** Center of ellipse */
	RS_Vector center;
	/** Endpoint of major axis */
	RS_Vector m_vMajorP;
	/** Ratio major / minor */
    double ratio = 1.;
	/** Start angle */
    double angle1 = 0.;
	/** End angle */
    double angle2 = 0.;
	/** Do we produce an arc (true) or full ellipse (false) */
    bool isArc = false;
};

/**
 * Constructor.
 *
 * @param isArc true if this action will produce an ellipse arc.
 *              false if it will produce a full ellipse.
 */
RS_ActionDrawEllipseAxis::RS_ActionDrawEllipseAxis(
		RS_EntityContainer& container,
		RS_GraphicView& graphicView,
		bool isArc)
	:RS_PreviewActionInterface("Draw ellipse with axis",
                               container, graphicView)
    ,pPoints(std::make_unique<Points>())
{
    pPoints->isArc = isArc;
    pPoints->angle2 = isArc ? 2. * M_PI : 0.;
    actionType = isArc ? RS2::ActionDrawEllipseArcAxis : RS2::ActionDrawEllipseAxis;
}

RS_ActionDrawEllipseAxis::~RS_ActionDrawEllipseAxis() = default;


void RS_ActionDrawEllipseAxis::init(int status) {
    RS_PreviewActionInterface::init(status);

    if (status==SetCenter) {
		pPoints->center = {};
    }
    if (status<=SetMajor) {
		pPoints->m_vMajorP = {};
    }
    if (status<=SetMinor) {
		pPoints->ratio = 0.5;
    }
    if (status<=SetAngle1) {
		pPoints->angle1 = 0.0;
    }
    if (status<=SetAngle2) {
		pPoints->angle2 = 0.0;
    }
}



void RS_ActionDrawEllipseAxis::trigger() {
    RS_PreviewActionInterface::trigger();

	RS_Ellipse* ellipse = new RS_Ellipse{container,
	{pPoints->center, pPoints->m_vMajorP, pPoints->ratio,
			pPoints->angle1, pPoints->angle2, false}
};
	if (pPoints->ratio > 1.){
        ellipse->switchMajorMinor();
    }
    ellipse->setLayerToActive();
    ellipse->setPenToActive();

    container->addEntity(ellipse);

    // upd. undo list:
    if (document) {
        document->startUndoCycle();
        document->addUndoable(ellipse);
        document->endUndoCycle();
    }

    RS_Vector rz = graphicView->getRelativeZero();
    graphicView->redraw(RS2::RedrawDrawing);
    graphicView->moveRelativeZero(rz);
    drawSnapper();

    setStatus(SetCenter);

    RS_DEBUG->print("RS_ActionDrawEllipseAxis::trigger():"
                    " entity added: %lu", ellipse->getId());
}



void RS_ActionDrawEllipseAxis::mouseMoveEvent(QMouseEvent* e) {
    RS_DEBUG->print("RS_ActionDrawEllipseAxis::mouseMoveEvent begin");

    RS_Vector mouse = snapPoint(e);

    switch (getStatus()) {
//    case SetCenter:
//        break;

    case SetMajor:
		if (pPoints->center.valid) {
            deletePreview();
			preview->addEntity(new RS_Ellipse{preview.get(),
				{pPoints->center, mouse-pPoints->center, 0.5, 0.0,
											  pPoints->isArc?2.*M_PI:0.
							   , false}});
            drawPreview();
        }
        break;

    case SetMinor:
		if (pPoints->center.valid && pPoints->m_vMajorP.valid) {
            deletePreview();
			RS_Line line{pPoints->center-pPoints->m_vMajorP, pPoints->center+pPoints->m_vMajorP};
            double d = line.getDistanceToPoint(mouse);
			pPoints->ratio = d/(line.getLength()/2);
			preview->addEntity(new RS_Ellipse{preview.get(),
											  {pPoints->center, pPoints->m_vMajorP, pPoints->ratio, 0., pPoints->isArc?2.*M_PI:0.
											   , false}});
			drawPreview();
        }
        break;

    case SetAngle1:
		if (pPoints->center.valid && pPoints->m_vMajorP.valid) {
            deletePreview();

            //angle1 = center.angleTo(mouse);

                        RS_Vector m = mouse;
						m.rotate(pPoints->center, -pPoints->m_vMajorP.angle());
						RS_Vector v = m-pPoints->center;
						v.y /= pPoints->ratio;
						pPoints->angle1 = v.angle(); // + m_vMajorP.angle();

			preview->addEntity(new RS_Line{preview.get(), pPoints->center, mouse});

			preview->addEntity(new RS_Ellipse{preview.get(),
				{pPoints->center, pPoints->m_vMajorP, pPoints->ratio, pPoints->angle1, pPoints->angle1+1.0
				 , false}});
            drawPreview();
        }
        break;

    case SetAngle2:
		if (pPoints->center.valid && pPoints->m_vMajorP.valid) {
            deletePreview();
            //angle2 = center.angleTo(mouse);

                        RS_Vector m = mouse;
						m.rotate(pPoints->center, -pPoints->m_vMajorP.angle());
						RS_Vector v = m-pPoints->center;
						v.y /= pPoints->ratio;
						pPoints->angle2 = v.angle(); // + m_vMajorP.angle();

			preview->addEntity(new RS_Line{preview.get(), pPoints->center, mouse});

			preview->addEntity(new RS_Ellipse{preview.get(),
											  {pPoints->center, pPoints->m_vMajorP,
												  pPoints->ratio,
												  pPoints->angle1, pPoints->angle2
							   , false}});
            drawPreview();
        }

    default:
        break;
    }

    RS_DEBUG->print("RS_ActionDrawEllipseAxis::mouseMoveEvent end");
}



void RS_ActionDrawEllipseAxis::mouseReleaseEvent(QMouseEvent* e) {
    // Proceed to next status
    if (e->button()==Qt::LeftButton) {
        RS_CoordinateEvent ce(snapPoint(e));
        coordinateEvent(&ce);
    }

    // Return to last status:
    else if (e->button()==Qt::RightButton) {
        deletePreview();
        init(getStatus()-1);
    }
}


void RS_ActionDrawEllipseAxis::coordinateEvent(RS_CoordinateEvent* e) {
	if (!e) return;
	RS_Vector const& mouse = e->getCoordinate();

    switch (getStatus()) {
    case SetCenter:
		pPoints->center = mouse;
        graphicView->moveRelativeZero(mouse);
        setStatus(SetMajor);
        break;

    case SetMajor:
		pPoints->m_vMajorP = mouse-	pPoints->center;
        setStatus(SetMinor);
        break;

    case SetMinor: {
			RS_Line line{pPoints->center-pPoints->m_vMajorP, pPoints->center+pPoints->m_vMajorP};
            double d = line.getDistanceToPoint(mouse);
			pPoints->ratio = d/(line.getLength()/2);
			if (!pPoints->isArc) {
                trigger();
                setStatus(SetCenter);
            } else {
                setStatus(SetAngle1);
            }
        }
        break;

    case SetAngle1: {
        //angle1 = center.angleTo(mouse);
                RS_Vector m = mouse;
				m.rotate(pPoints->center, -pPoints->m_vMajorP.angle());
				RS_Vector v = m-pPoints->center;
				v.y /= pPoints->ratio;
				pPoints->angle1 = v.angle();
        setStatus(SetAngle2);
                } break;

    case SetAngle2: {
        //angle2 = center.angleTo(mouse);
                RS_Vector m = mouse;
				m.rotate(pPoints->center, -pPoints->m_vMajorP.angle());
				RS_Vector v = m-pPoints->center;
				v.y /= pPoints->ratio;
				pPoints->angle2 = v.angle();
        trigger();
		}
		break;

    default:
        break;
    }
}



void RS_ActionDrawEllipseAxis::commandEvent(RS_CommandEvent* e) {
    QString c = e->getCommand().toLower();

	if (checkCommand("help", c)) {
		RS_DIALOGFACTORY->commandMessage(msgAvailableCommands()
										 + getAvailableCommands().join(", "));
		return;
	}

    switch (getStatus()) {
    case SetMinor: {
            bool ok;
            double m = RS_Math::eval(c, &ok);
            if (ok) {
                e->accept();
				pPoints->ratio = m / pPoints->m_vMajorP.magnitude();
				if (!pPoints->isArc) {
                    trigger();
                } else {
                    setStatus(SetAngle1);
                }
			} else
				RS_DIALOGFACTORY->commandMessage(tr("Not a valid expression"));
        }
        break;

    case SetAngle1: {
            bool ok;
            double a = RS_Math::eval(c, &ok);
            if (ok) {
                e->accept();
				pPoints->angle1 = RS_Math::deg2rad(a);
                setStatus(SetAngle2);
			} else
				RS_DIALOGFACTORY->commandMessage(tr("Not a valid expression"));
        }
        break;

    case SetAngle2: {
            bool ok;
            double a = RS_Math::eval(c, &ok);
            if (ok) {
                e->accept();
				pPoints->angle2 = RS_Math::deg2rad(a);
                trigger();
			} else
				RS_DIALOGFACTORY->commandMessage(tr("Not a valid expression"));
        }
        break;

    default:
        break;
    }
}


void RS_ActionDrawEllipseAxis::updateMouseButtonHints() {
	switch (getStatus()) {
	case SetCenter:
		RS_DIALOGFACTORY->updateMouseWidget(tr("Specify ellipse center"),
											tr("Cancel"));
		break;

	case SetMajor:
		RS_DIALOGFACTORY->updateMouseWidget(tr("Specify endpoint of major axis"),
											tr("Back"));
		break;

	case SetMinor:
		RS_DIALOGFACTORY->updateMouseWidget(
					tr("Specify endpoint or length of minor axis:"),
					tr("Back"));
		break;

	case SetAngle1:
		RS_DIALOGFACTORY->updateMouseWidget(tr("Specify start angle"),
											tr("Back"));
		break;

	case SetAngle2:
		RS_DIALOGFACTORY->updateMouseWidget(tr("Specify end angle"),
											tr("Back"));
		break;

	default:
		RS_DIALOGFACTORY->updateMouseWidget();
		break;
	}
}



void RS_ActionDrawEllipseAxis::updateMouseCursor() {
    graphicView->setMouseCursor(RS2::CadCursor);
}

// EOF
