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

#include "guichan/exception.hpp"
#include "guichan/font.hpp"
#include "guichan/graphics.hpp"
#include "guichan/mouseinput.hpp"

namespace gcn
{
    Window::Window()
            :mIsMoving(false)
    {
        setBorderSize(1);
        setPadding(2);
        setTitleBarHeight(16);
        setAlignment(Graphics::CENTER);
        addMouseListener(this);
        setMovable(true);
        setOpaque(true);
    }

    Window::Window(const std::string& caption)
            :mIsMoving(false)
    {
        setCaption(caption);
        setBorderSize(1);
        setPadding(2);
        setTitleBarHeight(16);
        setAlignment(Graphics::CENTER);
        addMouseListener(this);
        setMovable(true);
        setOpaque(true);
    }

    Window::~Window()
    {
    }

    void Window::setPadding(unsigned int padding)
    {
        mPadding = padding;
    }

    unsigned int Window::getPadding() const
    {
        return mPadding;
    }

    void Window::setTitleBarHeight(unsigned int height)
    {
        mTitleBarHeight = height;
    }

    unsigned int Window::getTitleBarHeight()
    {
        return mTitleBarHeight;
    }

    void Window::setCaption(const std::string& caption)
    {
        mCaption = caption;
    }

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

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

    unsigned int Window::getAlignment() const
    {
        return mAlignment;
    }

    void Window::draw(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;

        Rectangle d = getChildrenArea();

        // Fill the background around the content
        graphics->setColor(faceColor);
        // Fill top
        graphics->fillRectangle(Rectangle(0,0,getWidth(),d.y - 1));
        // Fill left
        graphics->fillRectangle(Rectangle(0,d.y - 1, d.x - 1, getHeight() - d.y + 1));
        // Fill right
        graphics->fillRectangle(Rectangle(d.x + d.width + 1,
                                          d.y - 1,
                                          getWidth() - d.x - d.width - 1,
                                          getHeight() - d.y + 1));
        // Fill bottom
        graphics->fillRectangle(Rectangle(d.x - 1,
                                          d.y + d.height + 1,
                                          d.width + 2,
                                          getHeight() - d.height - d.y - 1));

        if (isOpaque())
        {
            graphics->fillRectangle(d);
        }

        // Construct a rectangle one pixel bigger than the content
        d.x -= 1;
        d.y -= 1;
        d.width += 2;
        d.height += 2;

        // Draw a border around the content
        graphics->setColor(shadowColor);
        // Top line
        graphics->drawLine(d.x,
                           d.y,
                           d.x + d.width - 2,
                           d.y);

        // Left line
        graphics->drawLine(d.x,
                           d.y + 1,
                           d.x,
                           d.y + d.height - 1);

        graphics->setColor(highlightColor);
        // Right line
        graphics->drawLine(d.x + d.width - 1,
                           d.y,
                           d.x + d.width - 1,
                           d.y + d.height - 2);
        // Bottom line
        graphics->drawLine(d.x + 1,
                           d.y + d.height - 1,
                           d.x + d.width - 1,
                           d.y + d.height - 1);

        drawChildren(graphics);

        int textX;
        int textY;

        textY = ((int)getTitleBarHeight() - 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->setColor(getForegroundColor());
        graphics->setFont(getFont());
        graphics->pushClipArea(Rectangle(0, 0, getWidth(), getTitleBarHeight() - 1));
        graphics->drawText(getCaption(), textX, textY, getAlignment());
        graphics->popClipArea();
    }

    void Window::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(highlightColor);
            graphics->drawLine(i,i, width - i, i);
            graphics->drawLine(i,i + 1, i, height - i - 1);
            graphics->setColor(shadowColor);
            graphics->drawLine(width - i,i + 1, width - i, height - i);
            graphics->drawLine(i,height - i, width - i - 1, height - i);
        }
    }

    void Window::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getSource() != this)
        {
            return;
        }
        
        if (getParent() != NULL)
        {
            getParent()->moveToTop(this);
        }

        mDragOffsetX = mouseEvent.getX();
        mDragOffsetY = mouseEvent.getY();
        
        mIsMoving = mouseEvent.getY() <= (int)mTitleBarHeight;
    }

    void Window::mouseDragged(MouseEvent& mouseEvent)
    {
        if (mouseEvent.isConsumed() || mouseEvent.getSource() != this)
        {
            return;
        }
        
        if (isMovable() && mIsMoving)
        {
            setPosition(mouseEvent.getX() - mDragOffsetX + getX(),
                        mouseEvent.getY() - mDragOffsetY + getY());
        }

        mouseEvent.consume();
    }

    Rectangle Window::getChildrenArea()
    {
        return Rectangle(getPadding(),
                         getTitleBarHeight(),
                         getWidth() - getPadding() * 2,
                         getHeight() - getPadding() - getTitleBarHeight());
    }

    void Window::setMovable(bool movable)
    {
        mMovable = movable;
    }

    bool Window::isMovable() const
    {
        return mMovable;
    }

    void Window::setOpaque(bool opaque)
    {
        mOpaque = opaque;
    }

    bool Window::isOpaque()
    {
        return mOpaque;
    }

    void Window::resizeToContent()
    {
        WidgetListIterator it;

        int w = 0, h = 0;
        for (it = mWidgets.begin(); it != mWidgets.end(); it++)
        {
            if ((*it)->getX() + (*it)->getWidth() > w)
            {
                w = (*it)->getX() + (*it)->getWidth();
            }

            if ((*it)->getY() + (*it)->getHeight() > h)
            {
                h = (*it)->getY() + (*it)->getHeight();
            }
        }

        setSize(w + 2* getPadding(), h + getPadding() + getTitleBarHeight());
    }
}