/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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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 * 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/listbox.hpp"

#include "guichan/basiccontainer.hpp"
#include "guichan/font.hpp"
#include "guichan/graphics.hpp"
#include "guichan/key.hpp"
#include "guichan/listmodel.hpp"
#include "guichan/mouseinput.hpp"

namespace gcn
{
    ListBox::ListBox()
    {
        mSelected = -1;
        mListModel = NULL;
        mWrappingKeyboardSelection = false;
        setWidth(100);
        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);
    }

    ListBox::ListBox(ListModel *listModel)
    {
        mSelected = -1;
        mWrappingKeyboardSelection = false;
        setWidth(100);
        setListModel(listModel);
        setFocusable(true);

        addMouseListener(this);
        addKeyListener(this);
    }

    void ListBox::draw(Graphics* graphics)
    {
        graphics->setColor(getBackgroundColor());
        graphics->fillRectangle(Rectangle(0, 0, getWidth(), getHeight()));

        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->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;
            }

            Rectangle scroll;

            if (mSelected < 0)
            {
                scroll.y = 0;
            }
            else
            {
                scroll.y = getFont()->getHeight() * mSelected;
            }

            scroll.height = getFont()->getHeight();
            par->showWidgetPart(this, scroll);
        }
    }

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

        if (key.getValue() == Key::ENTER || key.getValue() == Key::SPACE)
        {
            generateAction();
            keyEvent.consume();
        }
        else if (key.getValue() == Key::UP)
        {
            setSelected(mSelected - 1);

            if (mSelected == -1)
            {
                if (isWrappingKeyboardSelection())
                {
                    setSelected(getListModel()->getNumberOfElements() - 1);
                }
                else
                {
                    setSelected(0);
                }
            }
            
            keyEvent.consume();
        }
        else if (key.getValue() == Key::DOWN)
        {
            if (isWrappingKeyboardSelection()
                && getSelected() == getListModel()->getNumberOfElements() - 1)
            {
                setSelected(0);
            }
            else
            {
                setSelected(getSelected() + 1);
            }
            
            keyEvent.consume();
        }
    }

    void ListBox::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == MouseEvent::LEFT)
        {
            setSelected(mouseEvent.getY() / getFont()->getHeight());
            generateAction();
        }
    }

    void ListBox::mouseWheelMovedUp(MouseEvent& mouseEvent)
    {
        if (isFocused())
        {
            if (getSelected() > 0 )
            {
                setSelected(getSelected() - 1);
            }

            mouseEvent.consume();
        }
    }

    void ListBox::mouseWheelMovedDown(MouseEvent& mouseEvent)
    {
        if (isFocused())
        {
            setSelected(getSelected() + 1);

            mouseEvent.consume();
        }
    }

    void ListBox::mouseDragged(MouseEvent& mouseEvent)
    {
        mouseEvent.consume();
    }

    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());
        }
    }

    bool ListBox::isWrappingKeyboardSelection()
    {
        return mWrappingKeyboardSelection;
    }

    void ListBox::setWrappingKeyboardSelection(bool wrapping)
    {
        mWrappingKeyboardSelection = wrapping;
    }
}