/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004 - 2008 Olof Naessén and Per Larsson
 *
 *
 * Per Larsson a.k.a finalman
 * Olof Naessén a.k.a jansem/yakslem
 *
 * Visit: http://guichan.sourceforge.net
 *
 * License: (BSD)
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name of Guichan nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (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.hpp"

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

namespace gcn
{
    Button::Button()
        : mHasMouse(false),
          mKeyPressed(false),
          mMousePressed(false),
          mAlignment(Graphics::CENTER),
          mSpacing(4)
    {
        setFocusable(true);
        adjustSize();
        setFrameSize(1);

        addMouseListener(this);
        addKeyListener(this);
        addFocusListener(this);
    }

    Button::Button(const std::string& caption)
            : mCaption(caption),
              mHasMouse(false),
              mKeyPressed(false),
              mMousePressed(false),
              mAlignment(Graphics::CENTER),
              mSpacing(4)
    {
        setFocusable(true);
        adjustSize();
        setFrameSize(1);

        addMouseListener(this);
        addKeyListener(this);
        addFocusListener(this);
    }

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

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

    void Button::setAlignment(Graphics::Alignment alignment)
    {
        mAlignment = alignment;
    }

    Graphics::Alignment Button::getAlignment() const
    {
        return mAlignment;
    }

    void Button::setSpacing(unsigned int spacing)
    {
        mSpacing = spacing;
    }

    unsigned int Button::getSpacing() const
    {
      return mSpacing;
    }

    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
        {
            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 = mSpacing;
              break;
          case Graphics::CENTER:
              textX = getWidth() / 2;
              break;
          case Graphics::RIGHT:
              textX = getWidth() - mSpacing;
              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 (isFocused())
            {
                graphics->drawRectangle(Rectangle(2, 2, getWidth() - 4,
                    getHeight() - 4));
            }
        }
    }

    void Button::adjustSize()
    {
        setWidth(getFont()->getWidth(mCaption) + 2*mSpacing);
        setHeight(getFont()->getHeight() + 2*mSpacing);
    }

    bool Button::isPressed() const
    {
        if (mMousePressed)
        {
            return mHasMouse;
        }
        else
        {
            return mKeyPressed;
        }
    }

    void Button::mousePressed(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == MouseEvent::LEFT)
        {
            mMousePressed = true;
            mouseEvent.consume();
        }
    }

    void Button::mouseExited(MouseEvent& mouseEvent _UNUSED_)
    {
        mHasMouse = false;
    }

    void Button::mouseEntered(MouseEvent& mouseEvent _UNUSED_)
    {
        mHasMouse = true;
    }

    void Button::mouseReleased(MouseEvent& mouseEvent)
    {
        if (mouseEvent.getButton() == MouseEvent::LEFT
            && mMousePressed
            && mHasMouse)
        {
            mMousePressed = false;
            distributeActionEvent();
            mouseEvent.consume();
        }
        else if (mouseEvent.getButton() == MouseEvent::LEFT)
        {
            mMousePressed = false;
            mouseEvent.consume();
        }
    }

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

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

        if (key.getValue() == Key::ENTER
            || key.getValue() == Key::SPACE)
        {
            mKeyPressed = true;
            keyEvent.consume();
        }
    }

    void Button::keyReleased(KeyEvent& keyEvent)
    {
        Key key = keyEvent.getKey();

        if ((key.getValue() == Key::ENTER
            || key.getValue() == Key::SPACE)
            && mKeyPressed)
        {
            mKeyPressed = false;
            distributeActionEvent();
            keyEvent.consume();
        }
    }

    void Button::focusLost(const Event& event _UNUSED_)
    {
        mMousePressed = false;
        mKeyPressed = false;
    }
}