/* Copyright (C) 2015 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/>.
 */

/*
Shapes.cpp
*/

#include "precompiled.h"

#include <string>

#include "Shapes.h"
#include "CLogger.h"
#include "CStr.h"

/**
 * Try to parse @p Value as a color. Returns true on success, false otherwise.
 * @param Value Should be "r g b" or "r g b a" where each value is an integer in [0,255].
 * @param DefaultAlpha The alpha value that is used if the format of @p Value is "r g b".
 */
bool CColor::ParseString(const CStr8& Value, int DefaultAlpha)
{
	const unsigned int NUM_VALS = 4;
	int values[NUM_VALS] = { 0, 0, 0, DefaultAlpha };
	std::stringstream stream;
	stream.str(Value);
	// Parse each value
	size_t i;
	for (i = 0; i < NUM_VALS; ++i)
	{
		if (stream.eof())
			break;

		stream >> values[i];
		if ((stream.rdstate() & std::stringstream::failbit) != 0)
		{
			LOGWARNING("Unable to parse CColor parameters. Your input: '%s'", Value.c_str());
			return false;
		}
		if (values[i] < 0 || values[i] > 255)
		{
			LOGWARNING("Invalid value (<0 or >255) when parsing CColor parameters. Your input: '%s'", Value.c_str());
			return false;
		}
	}

	if (i < 3)
	{
		LOGWARNING("Not enough parameters when parsing as CColor. Your input: '%s'", Value.c_str());
		return false;
	}
	if (!stream.eof())
	{
		LOGWARNING("Too many parameters when parsing as CColor. Your input: '%s'", Value.c_str());
		return false;
	}

	r = values[0]/255.f;
	g = values[1]/255.f;
	b = values[2]/255.f;
	a = values[3]/255.f;

	return true;
}


/*************************************************************************/

bool CColor::operator == (const CColor &color) const
{
	return r==color.r && 
		   g==color.g &&
		   b==color.b &&
		   a==color.a;
}

/*************************************************************************/

CRect::CRect() : 
	left(0.f), top(0.f), right(0.f), bottom(0.f) 
{
}

CRect::CRect(const CPos &pos) :
	left(pos.x), top(pos.y), right(pos.x), bottom(pos.y)
{
}

CRect::CRect(const CSize &size) :
	left(0.f), top(0.f), right(size.cx), bottom(size.cy)
{
}

CRect::CRect(const CPos &upperleft, const CPos &bottomright) :
	left(upperleft.x), top(upperleft.y), right(bottomright.x), bottom(bottomright.y)
{
}

CRect::CRect(const CPos &pos, const CSize &size) :
	left(pos.x), top(pos.y), right((pos.x+size.cx)), bottom((pos.y+size.cy))
{
}

CRect::CRect(const float l, const float t, const float r, const float b) :
	left(l), top(t), right(r), bottom(b)
{
}

// =
CRect& CRect::operator = (const CRect& a)
{
	left = a.left;
	top = a.top;
	right = a.right;
	bottom = a.bottom;
	return *this;
}

// ==
bool CRect::operator ==(const CRect &a) const
{
	return	(left==a.left &&
			 top==a.top &&
			 right==a.right &&
			 bottom==a.bottom);
}

// !=
bool CRect::operator != (const CRect& a) const
{
	return !(*this==a);
}

// - (the unary operator)
CRect CRect::operator - (void) const
{
	return CRect(-left, -top, -right, -bottom);
}

// + (the unary operator)
CRect CRect::operator + (void) const
{
	return *this;
}

// +
CRect CRect::operator + (const CRect& a) const
{
	return CRect(left+a.left, top+a.top, right+a.right, bottom+a.bottom);
}

// +
CRect CRect::operator + (const CPos& a) const
{
	return CRect(left+a.x, top+a.y, right+a.x, bottom+a.y);
}

// +
CRect CRect::operator + (const CSize& a) const
{
	return CRect(left+a.cx, top+a.cy, right+a.cx, bottom+a.cy);
}

// -
CRect CRect::operator - (const CRect& a) const
{ 
	return CRect(left-a.left, top-a.top, right-a.right, bottom-a.bottom);
}

// -
CRect CRect::operator - (const CPos& a) const
{ 
	return CRect(left-a.x, top-a.y, right-a.x, bottom-a.y);
}

// -
CRect CRect::operator - (const CSize& a) const
{ 
	return CRect(left-a.cx, top-a.cy, right-a.cx, bottom-a.cy);
}

// +=
void CRect::operator +=(const CRect& a)
{
	left += a.left;
	top += a.top;
	right += a.right;
	bottom += a.bottom;
}

// +=
void CRect::operator +=(const CPos& a)
{
	left += a.x;
	top += a.y;
	right += a.x;
	bottom += a.y;
}

// +=
void CRect::operator +=(const CSize& a)
{
	left += a.cx;
	top += a.cy;
	right += a.cx;
	bottom += a.cy;
}

// -=
void CRect::operator -=(const CRect& a)
{
	left -= a.left;
	top -= a.top;
	right -= a.right;
	bottom -= a.bottom;
}

// -=
void CRect::operator -=(const CPos& a)
{
	left -= a.x;
	top -= a.y;
	right -= a.x;
	bottom -= a.y;
}

// -=
void CRect::operator -=(const CSize& a)
{
	left -= a.cx;
	top -= a.cy;
	right -= a.cx;
	bottom -= a.cy;
}

float CRect::GetWidth() const 
{
	return right-left;
}

float CRect::GetHeight() const
{
	return bottom-top;
}

CSize CRect::GetSize() const
{
	return CSize(right-left, bottom-top);
}

CPos CRect::TopLeft() const
{
	return CPos(left, top);
}

CPos CRect::TopRight() const
{
	return CPos(right, top);
}

CPos CRect::BottomLeft() const
{
	return CPos(left, bottom);
}

CPos CRect::BottomRight() const
{
	return CPos(right, bottom);
}

CPos CRect::CenterPoint() const
{
	return CPos((left+right)/2.f, (top+bottom)/2.f);
}

bool CRect::PointInside(const CPos &point) const
{
	return (point.x >= left &&
			point.x <= right &&
			point.y >= top &&
			point.y <= bottom);
}

CRect CRect::Scale(float x, float y) const
{
	return CRect(left*x, top*y, right*x, bottom*y);
}

/*************************************************************************/

CPos::CPos() : x(0.f), y(0.f)
{
}

CPos::CPos(const CSize& s) : x(s.cx), y(s.cy)
{
}

CPos::CPos(const float &_x, const float &_y) : x(_x), y(_y)
{
}

// =
CPos& CPos::operator = (const CPos& a)
{
	x = a.x;
	y = a.y;
	return *this;
}

// ==
bool CPos::operator ==(const CPos &a) const
{
	return	(x==a.x && y==a.y);
}

// !=
bool CPos::operator != (const CPos& a) const
{
	return !(*this==a);
}

// - (the unary operator)
CPos CPos::operator - (void) const
{
	return CPos(-x, -y);
}

// + (the unary operator)
CPos CPos::operator + (void) const
{
	return *this;
}

// +
CPos CPos::operator + (const CPos& a) const
{
	return CPos(x+a.x, y+a.y);
}

// +
CPos CPos::operator + (const CSize& a) const
{
	return CPos(x+a.cx, y+a.cy);
}

// -
CPos CPos::operator - (const CPos& a) const
{ 
	return CPos(x-a.x, y-a.y);
}

// -
CPos CPos::operator - (const CSize& a) const
{ 
	return CPos(x-a.cx, y-a.cy);
}

// +=
void CPos::operator +=(const CPos& a)
{
	x += a.x;
	y += a.y;
}

// +=
void CPos::operator +=(const CSize& a)
{
	x += a.cx;
	y += a.cy;
}

// -=
void CPos::operator -=(const CPos& a)
{
	x -= a.x;
	y -= a.y;
}

// -=
void CPos::operator -=(const CSize& a)
{
	x -= a.cx;
	y -= a.cy;
}

/*************************************************************************/

CSize::CSize() : cx(0.f), cy(0.f) 
{
}

CSize::CSize(const CRect &rect) : cx(rect.GetWidth()), cy(rect.GetHeight()) 
{
}

CSize::CSize(const CPos &pos) : cx(pos.x), cy(pos.y) 
{
}

CSize::CSize(const float &_cx, const float &_cy) : cx(_cx), cy(_cy)
{
}

// =
CSize& CSize::operator = (const CSize& a)
{
	cx = a.cx;
	cy = a.cy;
	return *this;
}

// ==
bool CSize::operator ==(const CSize &a) const
{
	return	(cx==a.cx && cy==a.cy);
}

// !=
bool CSize::operator != (const CSize& a) const
{
	return !(*this==a);
}

// - (the unary operator)
CSize CSize::operator - (void) const
{
	return CSize(-cx, -cy);
}

// + (the unary operator)
CSize CSize::operator + (void) const
{
	return *this;
}

// +
CSize CSize::operator + (const CSize& a) const
{
	return CSize(cx+a.cx, cy+a.cy);
}

// -
CSize CSize::operator - (const CSize& a) const
{ 
	return CSize(cx-a.cx, cy-a.cy);
}

// /
CSize CSize::operator / (const float& a) const
{
	return CSize(cx/a, cy/a);
}

// *
CSize CSize::operator * (const float& a) const
{ 
	return CSize(cx*a, cy*a);
}

// +=
void CSize::operator +=(const CSize& a)
{
	cx += a.cx;
	cy += a.cy;
}

// -=
void CSize::operator -=(const CSize& a)
{
	cx -= a.cx;
	cy -= a.cy;
}

// /=
void CSize::operator /=(const float& a)
{
	cx /= a;
	cy /= a;
}

// *=
void CSize::operator *=(const float& a)
{
	cx *= a;
	cy *= a;
}