/* Copyright (C) 2013 Wildfire Games.
 * This file is part of 0 A.D.
 *
 * 0 A.D. 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.
 *
 * 0 A.D. 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 0 A.D.  If not, see <http://www.gnu.org/licenses/>.
 */

/*
Overlay.h

--Overview--

	Class representing 2D screen overlays; includes functionality for overlay
	position, color, texture and borders.
*/

#ifndef INCLUDED_OVERLAY
#define INCLUDED_OVERLAY

#include "graphics/SColor.h"

class CStr8;

struct CColor
{
	CColor() : r(-1.f), g(-1.f), b(-1.f), a(1.f) {}
	CColor(float cr,float cg,float cb,float ca) : r(cr), g(cg), b(cb), a(ca) {}

	bool ParseString(const CStr8& Value, float DefaultAlpha);

	bool operator == (const CColor &color) const;

	bool operator != (const CColor &color) const
	{
		return !(*this==color);
	}

	// For passing to glColor[34]fv:
	const float* FloatArray() const { return &r; }

	// For passing to CRenderer:
	SColor4ub AsSColor4ub() const
	{
		return SColor4ub((u8)(r*255.0), (u8)(g*255.0), (u8)(b*255.0), (u8)(a*255.0));
	}

	float r, g, b, a;
};

class CPos;
class CSize;


/**
 * Rectangle class used for screen rectangles. It's very similar to the MS
 * CRect, but with FLOATS because it's meant to be used with OpenGL which
 * takes float values.
 *
 * Changed to floats 2004-08-31 /GL
 */
class CRect
{
public:
	CRect();
	CRect(const CPos &pos);
	CRect(const CSize &size);
	CRect(const CPos &upperleft, const CPos &bottomright);
	CRect(const CPos &pos, const CSize &size);
	CRect(const float l, const float t, const float r, const float b);

	// Operators
	CRect&				operator =  (const CRect& a);
	bool				operator == (const CRect& a) const;
	bool				operator != (const CRect& a) const;
	CRect				operator -	(void) const;
	CRect				operator +	(void) const;

	CRect				operator +  (const CRect& a) const;
	CRect				operator +  (const CPos& a) const;
	CRect				operator +  (const CSize& a) const;
	CRect				operator -  (const CRect& a) const;
	CRect				operator -  (const CPos& a) const;
	CRect				operator -  (const CSize& a) const;

	void				operator += (const CRect& a);
	void				operator += (const CPos& a);
	void				operator += (const CSize& a);
	void				operator -= (const CRect& a);
	void				operator -= (const CPos& a);
	void				operator -= (const CSize& a);

	/**
	 * @return Width of Rectangle
	 */
	float GetWidth() const;
	
	/**
	 * @return Height of Rectangle
	 */
	float GetHeight() const;

	/**
	 * Get Size
	 */
	CSize GetSize() const;

	/**
	 * Get Position equivalent to top/left corner
	 */
	CPos TopLeft() const;

	/**
	 * Get Position equivalent to top/right corner
	 */
	CPos TopRight() const;

	/**
	 * Get Position equivalent to bottom/left corner
	 */
	CPos BottomLeft() const;

	/**
	 * Get Position equivalent to bottom/right corner
	 */
	CPos BottomRight() const;
	
	/**
	 * Get Position equivalent to the center of the rectangle
	 */
	CPos CenterPoint() const;

	/**
	 * Evalutates if point is within the rectangle
	 * @param point CPos representing point
	 * @return true if inside.
	 */
	bool PointInside(const CPos &point) const;

	CRect Scale(float x, float y) const;

	/**
	 * Returning CPos representing each corner.
	 */

public:
	/**
	 * Dimensions
	 */
	float left, top, right, bottom;
};

/**
 * Made to represent screen positions and delta values.
 * @see CRect
 * @see CSize
 */
class CPos
{
public:
	CPos();
	CPos(const CSize &pos);
	CPos(const float &_x, const float &_y);

	// Operators
	CPos&				operator =  (const CPos& a);
	bool				operator == (const CPos& a) const;
	bool				operator != (const CPos& a) const;
	CPos				operator -	(void) const;
	CPos				operator +	(void) const;

	CPos				operator +  (const CPos& a) const;
	CPos				operator +  (const CSize& a) const;
	CPos				operator -  (const CPos& a) const;
	CPos				operator -  (const CSize& a) const;

	void				operator += (const CPos& a);
	void				operator += (const CSize& a);
	void				operator -= (const CPos& a);
	void				operator -= (const CSize& a);

public:
	/**
	 * Position
	 */
	float x, y;
};

/**
 * Made to represent a screen size, should in philosophy
 * be made of unsigned ints, but for the sake of compatibility
 * with CRect and CPos it's not.
 * @see CRect
 * @see CPos
 */
class CSize
{
public:
	CSize();
	CSize(const CRect &rect);
	CSize(const CPos &pos);
	CSize(const float &_cx, const float &_cy);

	// Operators
	CSize&				operator =  (const CSize& a);
	bool				operator == (const CSize& a) const;
	bool				operator != (const CSize& a) const;
	CSize				operator -	(void) const;
	CSize				operator +	(void) const;

	CSize				operator +  (const CSize& a) const;
	CSize				operator -  (const CSize& a) const;
	CSize				operator /  (const float &a) const;
	CSize				operator *  (const float &a) const;

	void				operator += (const CSize& a);
	void				operator -= (const CSize& a);
	void				operator /= (const float& a);
	void				operator *= (const float& a);

public:
	/**
	 * Size
	 */
	float cx, cy;
};


#endif
