// -*-c++-*- osgWidget - Code by: Jeremy Moles (cubicool) 2007-2008
// $Id: Box.cpp 64 2008-06-30 21:32:00Z cubicool $

#include <osgWidget/Box>

namespace osgWidget {

Box::Box(const std::string& name, BOX_TYPE bt, bool uniform):
Window   (name),
_boxType (bt),
_uniform (uniform),
_lastAdd (0) {
}

Box::Box(const Box& box, const osg::CopyOp& co):
Window   (box, co),
_boxType (box._boxType),
_uniform (box._uniform),
_lastAdd (box._lastAdd) {
}

// TODO: Here's something to consider! If we resize the box by 1 every time, only the
// first resizable Widget will continue to get larger. This is really silly.
void Box::_resizeImplementation(point_type w, point_type h) {
	// Get the number of Widgets that agree to fill. Also perfom some casting to integers
	// in case we're being request to resize with pixel perfection.
	point_type numFill  = _getNumFill();
	int        iw       = static_cast<int>(w);
	int        ih       = static_cast<int>(h);
	int        inumFill = static_cast<int>(numFill);
	int        wrem     = 0;
	int        hrem     = 0;

	// If we have some widgets that fill, use these variables to keep a running count
	// of what needs to be added.
	if(inumFill) {
		wrem = iw % inumFill;
		hrem = ih % inumFill;
	}

	// If we have any widgets that agree to fill and there has been an honest resize
	// request, handle it here. The first case handles resizes where we have AT LEAST
	// as many pixels to fill as we have objects.
	if(numFill > 0.0f && (w != 0.0f || h != 0.0f)) {
		unsigned int cur = 0;

		for(Iterator i = begin(); i != end(); i++) if(i->valid() && i->get()->canFill()) {
			point_type addWidth  = 0.0f;
			point_type addHeight = 0.0f;

			// If our last added-to Widget was the last one, reset it to 0.
			if(_lastAdd >= size()) _lastAdd = 0;

			// We EVENLY give any remaining space to all fillable Widgets. In the
			// future we may want to be able to specify a fill "percent", which
			// would be some portion of the total available space.
			if(_boxType == HORIZONTAL) {
				if(w) {
					addWidth += static_cast<point_type>(iw / inumFill);

					if(cur >= _lastAdd && wrem) {
						_lastAdd++;
						addWidth++;
						wrem--;
					}
				}

				if(h) addHeight += h;
			}

			else {
				if(w) addWidth += w;

				if(h) {
					addHeight += static_cast<point_type>(ih / inumFill);

					if(cur >= _lastAdd && hrem) {
						_lastAdd++;
						addHeight++;
						hrem--;
					}
				}
			}

			if(addWidth != 0.0f) i->get()->addWidth(addWidth);

			if(addHeight != 0.0f) i->get()->addHeight(addHeight);

			cur++;
		}
	}

	// Get the width and height of our largest widgets; these values take
	// into account the padding, and will be affected by any resizing that occured above.
	point_type maxWidth  = _getMaxWidgetWidthTotal();
	point_type maxHeight = _getMaxWidgetHeightTotal();

	// Create counters for the various offsets as we position Widgets.
	point_type xoff = 0.0f;
	point_type yoff = 0.0f;
	point_type xadd = 0.0f;
	point_type yadd = 0.0f;

	for(Iterator i = begin(); i != end(); i++) {
		Widget* widget = i->get();

		// This positioning works by setting each Widget's unmodified origin and then
		// letting Window::_positionWidget calculate the padding/fill.
		if(_boxType == HORIZONTAL) {
			// First, lets set it to the proper x offset, ignoring any padding.
			widget->setOrigin(xoff, 0.0f);

			// Immediately reset our xoff for the next iteration.
			if(_uniform) {			
				_positionWidget(widget, maxWidth, maxHeight);

				xadd = maxWidth;
			}

			else {
				_positionWidget(widget, widget->getWidthTotal(), maxHeight);

				xadd = widget->getWidthTotal();
			}
		}

		else {
			widget->setOrigin(0.0f, yoff);

			if(_uniform) {
				_positionWidget(widget, maxWidth, maxHeight);

				yadd = maxHeight;
			}

			else {
				_positionWidget(widget, maxWidth, widget->getHeightTotal());

				yadd = widget->getHeightTotal();
			}
		}

		xoff += xadd;
		yoff += yadd;
	}
}

Window::Sizes Box::_getWidthImplementation() const {
	// The width of a horizontal box is all of the widgets added together.
	if(_boxType == HORIZONTAL) {
		// If we're a uniformly sized box, our width is our largest width plus our
		// largest padding, multiplied times the number of widgets. Our minimum width
		// is the size of the largest minWidth times the number of widgets.
		if(_uniform) return Sizes(
			_getMaxWidgetWidthTotal() * size(),
			_getMaxWidgetMinWidthTotal() * size()
		);

		// Othweriwse, our width is all of the widths added together, and our minWidth
		// is all of the minWidths added together.
		else return Sizes(
			_accumulate<Plus>(&Widget::getWidthTotal),
			_accumulate<Plus>(&Widget::getMinWidthTotal)
		);
	}

	// If we're a vertical Box, our width is the width of the larget Widget in the group.
	// Our minWidth is the largest minWidth of the Widgets in the group.
	else return Sizes(
		_getMaxWidgetWidthTotal(),
		_getMaxWidgetMinWidthTotal()
	);
}

Window::Sizes Box::_getHeightImplementation() const {
	if(_boxType == VERTICAL) {
		if(_uniform) return Sizes(
			_getMaxWidgetHeightTotal() * size(),
			_getMaxWidgetMinHeightTotal() * size()
		);
	
		else return Sizes(
			_accumulate<Plus>(&Widget::getHeightTotal),
			_accumulate<Plus>(&Widget::getMinHeightTotal)
		);
	}

	else return Sizes(
		_getMaxWidgetHeightTotal(),
		_getMaxWidgetMinHeightTotal()
	);
}

}
