/*      _______   __   __   __   ______   __   __   _______   __   __                 
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\                
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /                 
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /                  
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /                   
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /                    
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/                      
 *
 * Copyright (c) 2004, 2005 darkbits                        Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naess� 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
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 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
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/*
 * For comments regarding functions please see the header file. 
 */

#include <typeinfo>

#include "guichan/basiccontainer.h"
#include "guichan/widgets/listbox.h"
#include "guichan/widgets/scrollarea.h"


static const std::string selectEventId = "select";

namespace gcn
{
    ListBox::ListBox()
    {    
        mSelected = -1;
        mListModel = NULL;
        setWidth(100);
        setFocusable(true);
    
        addMouseListener(this);
        addKeyListener(this);
    }

    ListBox::ListBox(ListModel *listModel)
    {
        mSelected = -1;
        setWidth(100);
        setListModel(listModel);
        setFocusable(true);
    
        addMouseListener(this);
        addKeyListener(this);
    }

    void ListBox::draw(Graphics* graphics)
    {
        if (mListModel == NULL)      
        {
            return;
        }
    
        graphics->setColor(getForegroundColor());
        graphics->setFont(getFont());    
    
        int i, fontHeight;
        int y = 0;
    
        fontHeight = getFont()->getHeight();
    
        /**
         * @todo Check cliprects so we do not have to iterate over elements in the list model
         */
        for (i = 0; i < mListModel->getNumberOfElements(); ++i)
        {      
            if (i == mSelected)
            {
                graphics->drawRectangle(Rectangle(0, y, getWidth(), fontHeight));
				graphics->setColor(Color(40, 60, 120));
				graphics->fillRectangle(Rectangle(1, y + 1, getWidth() - 2, fontHeight - 2));
			}
      
            graphics->drawText(mListModel->getElementAt(i), 1, y);      

            y += fontHeight;
        }    
    }

    void ListBox::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 ListBox::logic()
    {
        adjustSize();    
    }

    int ListBox::getSelected()
    {
        return mSelected;
    }

    void ListBox::setSelected(int selected)
    {
        if (mListModel == NULL)
        {
            mSelected = -1;
        }
        else
        {
            if (selected < 0)
            {
                mSelected = -1;
            }
            else if (selected >= mListModel->getNumberOfElements())
            {
                mSelected = mListModel->getNumberOfElements() - 1;
            }
            else
            {
                mSelected = selected;
            }

            Widget *par = getParent();
            if (par == NULL)
            {
                return;
            }            
            
            ScrollArea* scrollArea = dynamic_cast<ScrollArea *>(par);
            if (scrollArea != NULL)
            {
                Rectangle scroll;
                scroll.y = getFont()->getHeight() * mSelected;
                scroll.height = getFont()->getHeight();
                scrollArea->scrollToRectangle(scroll);
            }
        }
        setDirty(true);
    }

    bool ListBox::keyPress(const Key& key)
    {
        bool ret = false;

        if (key.getValue() == Key::ENTER || key.getValue() == Key::SPACE)
        {
            generateAction();
            ret = true;
        }
        else if (key.getValue() == Key::UP)
        {
            selectNextPrevElement(-1);
            ret = true;
        }
        else if (key.getValue() == Key::DOWN)
        {
            selectNextPrevElement(+1);
            ret = true;
        }
        else if (key.getValue() == Key::PAGE_UP)
        {
            ret = selectNextPrevPage(-1);
        }
        else if (key.getValue() == Key::PAGE_DOWN)
        {
            ret = selectNextPrevPage(+1);
        }

        return ret;
    }

    bool ListBox::selectNextPrevPage(int sign)
    {
        BasicContainer *parent = getParent();
        if (parent == NULL)
        {
            return false;
        }

        int drawWidth = 0, drawHeight = 0;
        parent->getDrawSize(drawWidth, drawHeight, this);
        int pageSize = std::max(drawHeight / getFont()->getHeight(), 1);
        selectNextPrevElement(sign * pageSize);
        return true;
    }

    void ListBox::selectNextPrevElement(int sign)
    {
        int index = mSelected + sign;
        if (index < 0)
        {
            index = 0;
        }
        setSelected(index);
        generateAction(selectEventId);
    }

    void ListBox::mousePress(int x, int y, int button)
    {
        if (button == MouseInput::LEFT && hasMouse())
        {
            setSelected(y / getFont()->getHeight());
            generateAction();
        }
    }

    void ListBox::setListModel(ListModel *listModel)
    {
        mSelected = -1;
        mListModel = listModel;
        adjustSize();    
    }
  
    ListModel* ListBox::getListModel()
    {
        return mListModel;    
    }

    void ListBox::adjustSize()
    {
        if (mListModel != NULL)
        {      
            setHeight(getFont()->getHeight() * mListModel->getNumberOfElements());
        }    
    }  
}
