/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
 *                                               .)j(] .d_/ '-(  P .   S
 * License: (BSD)                                <Td/Z <fP"5(\"??"\a.  .L
 * Redistribution and use in source and          _dV>ws?a-?'      ._/L  #'
 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
 * that the following conditions are met:       j<<WP+k/);.        _W=j f
 * 1. Redistributions of source code must       .$%w\/]Q  . ."'  .  mj$
 *    retain the above copyright notice,        ]E.pYY(Q]>.   a     J@\
 *    this list of conditions and the           j(]1u<sE"L,. .   ./^ ]{a
 *    following disclaimer.                     4'_uomm\.  )L);-4     (3=
 * 2. Redistributions in binary form must        )_]X{Z('a_"a7'<a"a,  ]"[
 *    reproduce the above copyright notice,       #}<]m7`Za??4,P-"'7. ).m
 *    this list of conditions and the            ]d2e)Q(<Q(  ?94   b-  LQ/
 *    following disclaimer in the                <B!</]C)d_, '(<' .f. =C+m
 *    documentation and/or other materials      .Z!=J ]e []('-4f _ ) -.)m]'
 *    provided with the distribution.          .w[5]' _[ /.)_-"+?   _/ <W"
 * 3. Neither the name of Guichan nor the      :$we` _! + _/ .        j?
 *    names of its contributors may be used     =3)= _f  (_yQmWW$#(    "
 *    to endorse or promote products derived     -   W,  sQQQQmZQ#Wwa]..
 *    from this software without specific        (js, \[QQW$QWW#?!V"".
 *    prior written permission.                    ]y:.<\..          .
 *                                                 -]n w/ '         [.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
 * HOLDERS AND CONTRIBUTORS "AS IS" AND ANY         <  (; sac    ,    '
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING,               ]^ .-  %
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF            c <   r
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR            aga<  <La
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE          5%  )P'-3L
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR        _bQf` y`..)a
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES               _Pa,)!f/<[]/  ?"
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT      _2-..:. .r+_,.. .
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,     ?a.<%"'  " -'.a_ _,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION)                     ^
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 /*
  * For comments regarding functions please see the header file.
  */

#include "guisan/widgets/slider.hpp"

#include "guisan/graphics.hpp"
#include "guisan/key.hpp"
#include "guisan/mouseinput.hpp"

namespace gcn
{
    Slider::Slider(double scaleEnd) : Slider(0., scaleEnd)
    {}

    Slider::Slider(double scaleStart, double scaleEnd) :
        mScaleStart(scaleStart),
        mScaleEnd(scaleEnd),
        mValue(scaleStart)
    {
        setFocusable(true);
        setFrameSize(1);

        setStepLength((scaleEnd - scaleStart) / 10);

        addMouseListener(this);
        addKeyListener(this);
    }

    void Slider::setScale(double scaleStart, double scaleEnd)
    {
        mScaleStart = scaleStart;
        mScaleEnd = scaleEnd;
    }

    double Slider::getScaleStart() const
    {
        return mScaleStart;
    }

    void Slider::setScaleStart(double scaleStart)
    {
        mScaleStart = scaleStart;
    }

    double Slider::getScaleEnd() const
    {
        return mScaleEnd;
    }

    void Slider::setScaleEnd(double scaleEnd)
    {
        mScaleEnd = scaleEnd;
    }

    void Slider::draw(gcn::Graphics* graphics)
    {
        const auto alpha = getBaseColor().a;
        auto faceColor = getBaseColor();
        faceColor.a = alpha;

        auto backCol = getBackgroundColor();
        if (!isEnabled())
            backCol = backCol - 0x303030;

        graphics->setColor(backCol);
        graphics->fillRectangle(gcn::Rectangle(0, 0, getWidth(), getHeight()));

        drawMarker(graphics);
    }

    void Slider::drawMarker(gcn::Graphics* graphics)
    {
        const gcn::Color faceColor = getBaseColor();
        Color highlightColor, shadowColor;
        const int alpha = getBaseColor().a;
        if (isEnabled())
        {
            highlightColor = faceColor + 0x303030;
            shadowColor = faceColor - 0x303030;
        }
        else
        {
            highlightColor = faceColor + 0x151515;
            shadowColor = faceColor - 0x151515;
        }
        highlightColor.a = alpha;
        shadowColor.a = alpha;

        graphics->setColor(faceColor);

        if (getOrientation() == Horizontal)
        {
            const int v = getMarkerPosition();
            graphics->fillRectangle(gcn::Rectangle(v + 1, 1, getMarkerLength() - 2, getHeight() - 2));
            graphics->setColor(highlightColor);
            graphics->drawLine(v, 0, v + getMarkerLength() - 1, 0);
            graphics->drawLine(v, 0, v, getHeight() - 1);
            graphics->setColor(shadowColor);
            graphics->drawLine(v + getMarkerLength() - 1, 1, v + getMarkerLength() - 1, getHeight() - 1);
            graphics->drawLine(v + 1, getHeight() - 1, v + getMarkerLength() - 1, getHeight() - 1);

            if (isFocused())
            {
                graphics->setColor(getForegroundColor());
                graphics->drawRectangle(Rectangle(v + 2, 2, getMarkerLength() - 4, getHeight() - 4));
            }
        }
        else
        {
            const int v = (getHeight() - getMarkerLength()) - getMarkerPosition();
            graphics->fillRectangle(gcn::Rectangle(1, v + 1, getWidth() - 2, getMarkerLength() - 2));
            graphics->setColor(highlightColor);
            graphics->drawLine(0, v, 0, v + getMarkerLength() - 1);
            graphics->drawLine(0, v, getWidth() - 1, v);
            graphics->setColor(shadowColor);
            graphics->drawLine(1, v + getMarkerLength() - 1, getWidth() - 1, v + getMarkerLength() - 1);
            graphics->drawLine(getWidth() - 1, v + 1, getWidth() - 1, v + getMarkerLength() - 1);

            if (isFocused())
            {
                graphics->setColor(getForegroundColor());
                graphics->drawRectangle(Rectangle(2, v + 2, getWidth() - 4, getMarkerLength() - 4));
            }
        }
    }

    void Slider::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == gcn::MouseEvent::Left
            && mouseEvent.getX() >= 0
            && mouseEvent.getX() <= getWidth()
            && mouseEvent.getY() >= 0
            && mouseEvent.getY() <= getHeight())
        {
            if (getOrientation() == Horizontal)
            {
                setValue(markerPositionToValue(mouseEvent.getX() - getMarkerLength() / 2));
            }
            else
            {
                setValue(markerPositionToValue(getHeight() - mouseEvent.getY() - getMarkerLength() / 2));
            }

            distributeActionEvent();
        }
    }

    void Slider::mouseDragged(MouseEvent& mouseEvent)
    {
        if (getOrientation() == Horizontal)
        {
            setValue(markerPositionToValue(mouseEvent.getX() - getMarkerLength() / 2));
        }
        else
        {
            setValue(markerPositionToValue(getHeight() - mouseEvent.getY() - getMarkerLength() / 2));
        }

        distributeActionEvent();

        mouseEvent.consume();
    }

    void Slider::setValue(double value)
    {
        if (value > getScaleEnd())
        {
            mValue = getScaleEnd();
            return;
        }

        if (value < getScaleStart())
        {
            mValue = getScaleStart();
            return;
        }

        mValue = value;
    }

    double Slider::getValue() const
    {
        return mValue;
    }

    int Slider::getMarkerLength() const
    {
        return mMarkerLength;
    }

    void Slider::setMarkerLength(int length)
    {
        mMarkerLength = length;
    }

    void Slider::keyPressed(KeyEvent& keyEvent)
    {
        const Key key = keyEvent.getKey();

        if (getOrientation() == Horizontal)
        {
            if (key.getValue() == Key::Right)
            {
                setValue(getValue() + getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
            else if (key.getValue() == Key::Left)
            {
                setValue(getValue() - getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
        }
        else
        {
            if (key.getValue() == Key::Up)
            {
                setValue(getValue() + getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
            else if (key.getValue() == Key::Down)
            {
                setValue(getValue() - getStepLength());
                distributeActionEvent();
                keyEvent.consume();
            }
        }
    }

    void Slider::setOrientation(Orientation orientation)
    {
        mOrientation = orientation;
    }

    Slider::Orientation Slider::getOrientation() const
    {
        return mOrientation;
    }

    double Slider::markerPositionToValue(int v) const
    {
        int w;
        if (getOrientation() == Horizontal)
        {
            w = getWidth();
        }
        else
        {
            w = getHeight();
        }

        const double pos = v / ((double)w - getMarkerLength());
        return (1.0 - pos) * getScaleStart() + pos * getScaleEnd();
    }

    int Slider::valueToMarkerPosition(double value) const
    {
        int v;
        if (getOrientation() == Horizontal)
        {
            v = getWidth();
        }
        else
        {
            v = getHeight();
        }

        const int w = (int)((v - getMarkerLength())
            * (value - getScaleStart())
            / (getScaleEnd() - getScaleStart()));

        if (w < 0)
        {
            return 0;
        }

        if (w > v - getMarkerLength())
        {
            return v - getMarkerLength();
        }

        return w;
    }

    void Slider::setStepLength(double length)
    {
        mStepLength = length;
    }

    double Slider::getStepLength() const
    {
        return mStepLength;
    }

    int Slider::getMarkerPosition() const
    {
        return valueToMarkerPosition(getValue());
    }

    void Slider::mouseWheelMovedUp(MouseEvent& mouseEvent)
    {
        setValue(getValue() + getStepLength());
        distributeActionEvent();

        mouseEvent.consume();
    }

    void Slider::mouseWheelMovedDown(MouseEvent& mouseEvent)
    {
        setValue(getValue() - getStepLength());
        distributeActionEvent();

        mouseEvent.consume();
    }
}
