/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * 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
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 * binary forms, with or without                 )4d[#7r, .   '     )d`)[
 * modification, are permitted provided         _Q-5'5W..j/?'   -?!\)cam'
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 */

/*
 * 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)
    {
        setFocusable(true);
        adjustSize();
        setBorderSize(1);

        addMouseListener(this);
        addKeyListener(this);
    }

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

        addMouseListener(this);
        addKeyListener(this);
    }

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

    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
        {
            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 (isFocused())
            {
                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
    {
        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)
    {
        mHasMouse = false;
    }

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

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

    void Button::focusLost()
    {
        mMousePressed = false;
        mKeyPressed = false;
    }
}