/*      _______   __   __   __   ______   __   __   _______   __   __                 
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\                
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /                 
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /                  
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /                   
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        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       .$%w\/]Q  . ."'  .  mj$
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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/button.h"
#include "guichan/exception.h"
#include "guichan/mouseinput.h"

namespace gcn
{
    Button::Button()
    {
        mAlignment = Graphics::CENTER;
        addMouseListener(this);
        addKeyListener(this);
        adjustSize();
        setBorderSize(1);        
    }
  
    Button::Button(const std::string& caption)
    {
        mCaption = caption;
        mAlignment = Graphics::CENTER;
        setFocusable(true);
        adjustSize();
        setBorderSize(1);
        
        mMouseDown = false;
        mKeyDown = false;
        mHotKeyDown = false;

        addMouseListener(this);
        addKeyListener(this);    
    }

    void Button::setCaption(const std::string& caption)
    {
        mCaption = caption;
        setDirty(true);
    }

    const std::string& Button::getCaption() const
    {
        return mCaption;        
    }

    void Button::setAlignment(unsigned int alignment)
    {
        mAlignment = alignment;
    }

    unsigned int Button::getAlignment() const
    {
        return mAlignment;
    }
    
    void Button::draw(Graphics* graphics)
    {
        Color faceColor = getBaseColor();
        Color highlightColor, shadowColor;
        int alpha = getBaseColor().a;
        
        if (isPressed())
        {
            faceColor = faceColor - 0x303030;
            faceColor.a = alpha;
            highlightColor = faceColor - 0x303030;
            highlightColor.a = alpha;
            shadowColor = faceColor + 0x303030;      
            shadowColor.a = alpha;
        }
        else if (isEnabled())
        {
            highlightColor = faceColor + 0x303030;
            highlightColor.a = alpha;
            shadowColor = faceColor - 0x303030;
            shadowColor.a = alpha;
        }
        else
        {
            faceColor = getDisabledColor();
            highlightColor = faceColor + 0x303030;
            highlightColor.a = alpha;
            shadowColor = faceColor - 0x303030;
            shadowColor.a = alpha;
        }

        graphics->setColor(faceColor);
        graphics->fillRectangle(Rectangle(1, 1, getDimension().width-1, getHeight() - 1));
    
        graphics->setColor(highlightColor);
        graphics->drawLine(0, 0, getWidth() - 1, 0);
        graphics->drawLine(0, 1, 0, getHeight() - 1);
    
        graphics->setColor(shadowColor);
        graphics->drawLine(getWidth() - 1, 1, getWidth() - 1, getHeight() - 1);
        graphics->drawLine(1, getHeight() - 1, getWidth() - 1, getHeight() - 1);

        graphics->setColor(getForegroundColor());

        int textX;
        int textY = getHeight() / 2 - getFont()->getHeight() / 2;
        
        switch (getAlignment())
        {
          case Graphics::LEFT:
              textX = 4;
              break;
          case Graphics::CENTER:
              textX = getWidth() / 2;
              break;
          case Graphics::RIGHT:
              textX = getWidth() - 4;
              break;
          default:
              throw GCN_EXCEPTION("Unknown alignment.");
        }

        graphics->setFont(getFont());
        
        if (isPressed())
        {
            graphics->drawText(getCaption(), textX + 1, textY + 1, getAlignment());
        }
        else
        {
            graphics->drawText(getCaption(), textX, textY, getAlignment());
            
            if (hasFocus())
            {
                graphics->drawRectangle(Rectangle(2, 2, getWidth() - 4,
                                                  getHeight() - 4));
            }      
        }    
    }

    void Button::drawBorder(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 Button::adjustSize()
    {
        setWidth(getFont()->getWidth(mCaption) + 8);
        setHeight(getFont()->getHeight() + 8);
    }

    bool Button::isPressed() const
    {
        return (hasMouse() && mMouseDown) || mKeyDown || mHotKeyDown;
    }
    
    void Button::mouseClick(int x, int y, int button, int count)
    {
        if (button == MouseInput::LEFT)
        {
            generateAction();
        }
    }

    void Button::mousePress(int x, int y, int button)
    {
        if (button == MouseInput::LEFT && hasMouse())
        {      
            mMouseDown = true;
        }
    }

    void Button::mouseRelease(int x, int y, int button)
    {
        if (button == MouseInput::LEFT)
        {      
            mMouseDown = false;
        }
    }
  
    bool Button::keyPress(const Key& key)
    {
        bool ret = false;

        if (key.getValue() == Key::ENTER || key.getValue() == Key::SPACE)
        {
            mKeyDown = true;
            ret = true;
        }

        mHotKeyDown = false;
        mMouseDown = false;
        return ret;
    }

    bool Button::keyRelease(const Key& key)
    {
        bool ret = false;

        if ((key.getValue() == Key::ENTER || key.getValue() == Key::SPACE) && mKeyDown)
        {
            mKeyDown = false;
            generateAction();
            ret = true;
        }
        return ret;
    }

    void Button::hotKeyPress()
    {
        mHotKeyDown = true;
        mMouseDown = false;
    }

    void Button::hotKeyRelease()
    {
        if (mHotKeyDown)
        {
            mHotKeyDown = false;
            generateAction();
        }
    }

    void Button::lostFocus()
    {
        mMouseDown = false;
        mKeyDown = false;
		mHotKeyDown = false;
    }  
}
