/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef ULTIMA_SHARED_GFX_VISUAL_ITEM_H
#define ULTIMA_SHARED_GFX_VISUAL_ITEM_H

#include "graphics/managed_surface.h"
#include "ultima/shared/core/named_item.h"
#include "ultima/shared/gfx/screen.h"
#include "ultima/shared/gfx/visual_surface.h"

namespace Ultima {
namespace Shared {
namespace Gfx {

class Popup;

/**
 * Acts as the base class for all classes that have a visual representation on the screen
 */
class VisualItem : public NamedItem {
	friend class VisualSurface;
	DECLARE_MESSAGE_MAP;
	bool ShowMsg(CShowMsg *msg);
	bool HideMsg(CHideMsg *msg);
private:
	/**
	 * Common initialization method used by the constructors
	 */
	void init(TreeItem *parent = nullptr);
protected:
	Rect _bounds;
	bool _isDirty;
public:
	CLASSDEF;
	VisualItem(TreeItem *parent = nullptr) { init(parent); }
	VisualItem(const Rect &r, TreeItem *parent = nullptr) : _bounds(r) { init(parent); }
	VisualItem(const Common::String &name, TreeItem *parent = nullptr) : NamedItem(name) { init(parent); }
	VisualItem(const Common::String &name, const Rect &r, TreeItem *parent = nullptr) : NamedItem(name),
		_bounds(r) { init(parent); }

	~VisualItem() override {
	}

	/**
	 * Draws the visual item on the screen
	 */
	virtual void draw() {
		_isDirty = false;
	}

	/**
	 * Gets a managed surface representing the portion of the screen defined by _bounds.
	 * This allows drawing to be done without worrying about offsets or clipping
	 */
	VisualSurface getSurface();

	/**
	 * Gets the bounds for the item
	 */
	const Rect &getBounds() { return _bounds; }

	/**
	 * Sets the bounds for the item
	 * @remarks Does not erase the item if it's already been drawn
	 */
	void setBounds(const Rect &r);

	/**
	 * Set the position for the item
	 * @remarks Does not erase the item if it's already been drawn
	 */
	void setPosition(const Point &pt);

	/**
	 * Flags the item as being changed, requiring a redraw
	 */
	virtual void setDirty(bool dirty = true);

	/**
	 * Clears the dirty flag
	 */
	void clearDirty() { setDirty(false); }

	/**
	 * Returns true if the item is dirty, requiring a redraw
	 */
	virtual bool isDirty() const { return _isDirty; }

	/**
	 * Helper function to switch to a different visual item
	 */
	void setView(const Common::String &viewName);

	/**
	 * Helper function to switch to an on-screen popup
	 */
	void setPopup(Gfx::Popup *popup);

	/**
	 * Helper function to switch the item to be the current view
	 */
	void setView();
};

} // End of namespace Gfx
} // End of namespace Shared
} // End of namespace Ultima

#endif