/***************************************************************************
 *   Copyright (C) 2004 by Christoph Freundl                               *
 *   Christoph.Freundl@informatik.uni-erlangen.de                          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

#include "backgroundwidget.h"
#include <SDL_image.h>
#include "graphics.h"

#include <iostream>

namespace SDLwidgets {

BackgroundWidget::BackgroundWidget( Widget* widget, const char* filename )
	: WidgetDecorator( widget ), _alpha( SDL_ALPHA_OPAQUE ) {
	if ( widget ) {
		widget->setPosition( 0, 0 );
		_min_width = _widget->getMinWidth();
		_min_height = _widget->getMinHeight();
		_max_width = _widget->getMaxWidth();
		_max_height = _widget->getMaxHeight();
		_width = _widget->getWidth();
		_height = _widget->getHeight();
	}
	_color.r = 0;
	_color.g = 0;
	_color.b = 0;
	_image = IMG_Load( filename );
}

BackgroundWidget::BackgroundWidget( int width, int height )
	: WidgetDecorator( 0 ), _alpha( SDL_ALPHA_OPAQUE ), _image( 0 ) {
	_min_width = width;
	_max_width = width;
	_width = width;
	_min_height = height;
	_max_height = height;
	_height = height;
}

void BackgroundWidget::draw( SDL_Surface* surface ) {
	if ( _alpha != SDL_ALPHA_TRANSPARENT ) {
		if ( !_image ) {
			if ( _alpha == SDL_ALPHA_OPAQUE ) {
				Uint32 pixelColor =
					SDL_MapRGBA( surface->format, _color.r, _color.g, _color.b, _alpha );
				SDL_Rect rect;
				getOffset( rect.x, rect.y );
				rect.w = _width;
				rect.h = _height;
				SDL_FillRect( surface, &rect, pixelColor );
			}
			else {
				SDL_Rect rect;
				getOffset( rect.x, rect.y );
				rect.w = _width;
				rect.h = _height;
				Graphics::fillRectAlpha( surface, &rect, _color, _alpha );
			}
		}
		else {
			Sint16 offset_x, offset_y;
			getOffset( offset_x, offset_y );
			SDL_Rect src_rect, dst_rect;
			src_rect.x = 0; src_rect.y = 0;
			dst_rect.y = offset_y;
			while ( dst_rect.y - offset_y < _height ) {
				if ( _image->h > _height - dst_rect.y + offset_y )
					src_rect.h = _height - dst_rect.y + offset_y;
				else
					src_rect.h = _image->h;
				dst_rect.x = offset_x;
				while ( dst_rect.x - offset_x < _width ) {
					if ( _image->w > _width - dst_rect.x + offset_x )
						src_rect.w = _width - dst_rect.x + offset_x;
					else
						src_rect.w = _image->w;
					SDL_BlitSurface( _image, &src_rect, surface, &dst_rect );
					dst_rect.x += _image->w;
				}
				dst_rect.y += _image->h;
			}
		}
	}
	
	if ( _widget )
		_widget->draw( surface );
}

void BackgroundWidget::setColor( const SDL_Color& color ) {
	Widget::setColor( color );
}

void BackgroundWidget::setAlpha( int alpha ) {
	_alpha = alpha;
}

void BackgroundWidget::setWidth( const Uint16 width ) {
	if ( width < _min_width )
		Widget::setWidth( _min_width );
	else
		Widget::setWidth( width );
	
	if ( _widget ) {
		_widget->setWidth( _width );
		_widget->setPosition( ( _width - _widget->getWidth() ) / 2,
		                      ( _height - _widget->getHeight() ) / 2 );
	}
}

void BackgroundWidget::setMinWidth( const Uint16 min_width ) {
	_min_width = min_width;
	if ( _width < _min_width ) {
		setWidth( _min_width );
	}
}

void BackgroundWidget::setHeight( const Uint16 height ) {
	_height = height;
	
	if ( _widget ) {
		_widget->setHeight( _height );
		_widget->setPosition( ( _width - _widget->getWidth() ) / 2,
	                         ( _height - _widget->getHeight() ) / 2 );
	}
}

void BackgroundWidget::doLayout() {
	if ( _widget ) {
		if ( _widget->getWidth() > _min_width )
			_width = _widget->getWidth();
		if ( _widget->getHeight() > _min_height )
			_height = _widget->getHeight();
	}
	
	Widget::doLayout();
}

}