#ifndef TEXTOOLITEM_H_
#define TEXTOOLITEM_H_

#include "Selectable.h"
#include "Transformable.h"
#include "Renderable.h"
#include <vector>

namespace textool {

class TexToolItem;
typedef std::vector<TexToolItem*> TexToolItemVec;

/** greebo: Abstract base class of a TexToolItem visitor class
 */
class ItemVisitor
{
public:
	virtual ~ItemVisitor() {}

	virtual void visit(TexToolItem* texToolItem) = 0;
};

/** greebo: A TexToolItem is an object that...
 *
 * ...has a visual representation in the TexTool (Renderable).
 * ...can be selected (Selectable (implicitly derived from Transformable))
 * ...can be transformed (Transformable)
 * ...can have one or more children of the same type, to allow grouping.
 *
 * The virtual default implementations mainly cycle through all the children
 * of this item and pass the call. All the default transformation routines
 * call the object's update() method when finished.
 *
 * This object should technically be instantiable, but won't do anything but
 * cycling through its (empty) children list. Hence the according methods
 * have to be overridden in order to make a real TexToolItem.
 */
class TexToolItem :
	public Renderable,
	public Transformable
{
protected:
	// The list of children of this object
	TexToolItemVec _children;

public:

	virtual ~TexToolItem() {}

	/** greebo: Adds the given TexToolItem as child of this Item.
	 *
	 * Any transformations will affect the children as well.
	 */
	virtual void addChild(TexToolItem* child);

	/** greebo: Returns the vector of children of this object.
	 *
	 * A reference to the internal list of this object is returned.
	 */
	virtual TexToolItemVec& getChildren();

	virtual void foreachItem(ItemVisitor& visitor);

	/** greebo: Returns a list of selectable items that correspond
	 * to the given coords.
	 */
	virtual TexToolItemVec getSelectableChildren(const Rectangle& rectangle);

	/** greebo: Default transform implementation: transform all children.
	 */
	virtual void transform(const Matrix4& matrix);

	/** greebo: Transforms this object if it's selected only.
	 *
	 * Default implementation for a TexToolItem: transform self
	 * and pass the call to the children.
	 */
	virtual void transformSelected(const Matrix4& matrix);

	virtual void flipSelected(const int& axis);

	virtual void snapSelectedToGrid(float grid);

	// Default implementation of getExtents(). All children's AABB are combined.
	virtual AABB getExtents();

	virtual AABB getSelectedExtents();

	virtual void moveSelectedTo(const Vector2& targetCoords);

	// Default render routine: ask all children to render their part
	virtual void render();

	// Default beginTransformation routine: propagate the call to children
	virtual void beginTransformation();

	// Default endTransformation routine: propagate the call to children
	virtual void endTransformation();

	/** greebo: This tells the Transformable to sync up their source objects
	 * 			(e.g. by calling Patch::controlPointsChanged()) to make
	 * 			the changes visible in the scenegraph.
	 */
	virtual void update();

}; // class TexToolItem

/** greebo: Visitor class to select/deselect all visited TexToolItems
 */
class SetSelectedWalker :
	public textool::ItemVisitor
{
	bool _selected;
public:
	SetSelectedWalker(bool selected) :
		_selected(selected)
	{}

	void visit(TexToolItem* texToolItem) {
		texToolItem->setSelected(_selected);
	}
};

/** greebo: Visitor class to count the selected items
 */
class SelectedCounter :
	public textool::ItemVisitor
{
	int& _counter;
public:
	SelectedCounter(int& counter) :
		_counter(counter)
	{}

	void visit(TexToolItem* texToolItem) {
		if (texToolItem->isSelected()) {
			_counter++;
		}
	}
};

} // namespace textool

#endif /*TEXTOOLITEM_H_*/
