/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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@\
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 *    reproduce the above copyright notice,       #}<]m7`Za??4,P-"'7. ).m
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT       )/ )/           !
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * (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 "guichan/widgets/slider.hpp"

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

namespace gcn
{
    Slider::Slider(double scaleEnd)
    {
        mMouseDrag = false;


        mScaleStart = 0;
        mScaleEnd = scaleEnd;

        setFocusable(true);
        setBorderSize(1);
        setOrientation(HORIZONTAL);
        setValue(0);
        setStepLength(scaleEnd / 10);
        setMarkerLength(10);

        addMouseListener(this);
        addKeyListener(this);
    }

    Slider::Slider(double scaleStart, double scaleEnd)
    {
        mMouseDrag = false;

        mScaleStart = scaleStart;
        mScaleEnd = scaleEnd;

        setFocusable(true);
        setBorderSize(1);
        setOrientation(HORIZONTAL);
        setValue(scaleStart);
        setStepLength((scaleEnd  - scaleStart)/ 10);
        setMarkerLength(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)
    {
        Color shadowColor = getBaseColor() - 0x101010;
        int alpha = getBaseColor().a;
         shadowColor.a = alpha;

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

        drawMarker(graphics);
    }

    void Slider::drawBorder(gcn::Graphics* graphics)
    {
        Color faceColor = getBaseColor();
        Color highlightColor, shadowColor;
        int alpha = getBaseColor().a;
        int width = getWidth() + getBorderSize() * 2 - 1;
        int height = getHeight() + getBorderSize() * 2 - 1;
        highlightColor = faceColor + 0x303030;
        highlightColor.a = alpha;
        shadowColor = faceColor - 0x303030;
        shadowColor.a = alpha;

        unsigned int i;
        for (i = 0; i < getBorderSize(); ++i)
        {
            graphics->setColor(shadowColor);
            graphics->drawLine(i,i, width - i, i);
            graphics->drawLine(i,i + 1, i, height - i - 1);
            graphics->setColor(highlightColor);
            graphics->drawLine(width - i,i + 1, width - i, height - i);
            graphics->drawLine(i,height - i, width - i - 1, height - i);
        }
    }

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

        graphics->setColor(faceColor);

        if (getOrientation() == HORIZONTAL)
        {
            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
        {
            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));
            }

            generateAction();
        }
    }

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

        generateAction();

        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)
    {
        Key key = keyEvent.getKey();

        if (getOrientation() == HORIZONTAL)
        {
            if (key.getValue() == Key::RIGHT)
            {
                setValue(getValue() + getStepLength());
                generateAction();
                keyEvent.consume();
            }
            else if (key.getValue() == Key::LEFT)
            {
                setValue(getValue() - getStepLength());
                generateAction();
                keyEvent.consume();
            }            
        }
        else
        {
            if (key.getValue() == Key::UP)
            {
                setValue(getValue() + getStepLength());
                generateAction();
                keyEvent.consume();
            }
            else if (key.getValue() == Key::DOWN)
            {
                setValue(getValue() - getStepLength());
                generateAction();
                keyEvent.consume();
            }
        }
    }

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

    unsigned int Slider::getOrientation() const
    {
        return mOrientation;
    }

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

        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();
        }

        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());
        generateAction();

        mouseEvent.consume();
    }

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

        mouseEvent.consume();
    }
}