/****************************************************************************
Copyright (c) 2010 cocos2d-x.org

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of this software and associated documentation files (the "Software"), to deal
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****************************************************************************/

#ifndef __CCGEMETRY_H__
#define __CCGEMETRY_H__

#include "../platform/CCPlatformMacros.h"
#include "CCObject.h"
#include <math.h>

// why
#if !defined(FLT_EPSILON)
#define FLT_EPSILON 1.19209290E-07F // decimal constant 
#endif

NS_CC_BEGIN

/**
 * @addtogroup data_structures
 * @{
 */

// for CCPoint assignement operator and copy constructor
class CCSize;

/**
 * @js NA
 */
class CC_DLL CCPoint
{
    GEODE_FRIEND_MODIFY
public:
    float x;
    float y;
    // alk modifications: all defined

    inline CCPoint() : x(0), y(0) {}
    inline CCPoint(float x, float y) : x(x), y(y) {}
    /**
     * @lua NA
     */
    inline CCPoint(const CCPoint& other) : x(other.x), y(other.y) {}
    /**
     * @lua NA
     */
    inline CCPoint(const CCSize& size);
    /**
     * @lua NA
     */
    inline CCPoint& operator= (const CCPoint& other) {
        setPoint(other.x, other.y);
        return *this;
    }
    /**
     * @lua NA
     */
    inline CCPoint& operator= (const CCSize& size);
    /**
     * @lua NA
     */
    inline CCPoint operator+(const CCPoint& right) const {
        return CCPoint(this->x + right.x, this->y + right.y);
    }
    /**
     * @lua NA
     */
    inline CCPoint operator-(const CCPoint& right) const {
        return CCPoint(this->x - right.x, this->y - right.y);
    }
    /**
     * @lua NA
     */
    inline CCPoint operator-() const {
        return CCPoint(-x, -y);
    }
    /**
     * @lua NA
     */
    inline CCPoint operator*(float a) const {
        return CCPoint(this->x * a, this->y * a);
    }
    /**
     * @lua NA
     */
    inline CCPoint operator/(float a) const {
        return CCPoint(this->x / a, this->y / a);
    }


    // camila modification
    inline CCPoint operator*(const CCPoint& right) const {
        return CCPoint(x * right.x, y * right.y);
    }
    inline CCPoint operator/(const CCPoint& right) const {
        return CCPoint(x / right.x, y / right.y);
    }
    //314

    /**
     * @lua NA
     */
    inline void setPoint(float x, float y) {
        this->x = x;
        this->y = y;
    }

    inline bool equals(const CCPoint& target) const {
        return (fabs(this->x - target.x) < FLT_EPSILON) && (fabs(this->y - target.y) < FLT_EPSILON);
    }
    
    /** @returns if points have fuzzy equality which means equal with some degree of variance.
     * @since v2.1.4
     * @lua NA
     */
    inline bool fuzzyEquals(const CCPoint& b, float var) const {
        if(x - var <= b.x && b.x <= x + var)
            if(y - var <= b.y && b.y <= y + var)
                return true;
        return false;
    }

    /** Calculates distance between point an origin
     * @return float
     * @since v2.1.4
     * @lua NA
     */
    inline float getLength() const {
        return sqrtf(x*x + y*y);
    };

    /** Calculates the square length of a CCPoint (not calling sqrt() )
     * @return float
     * @since v2.1.4
     * @lua NA
     */
    inline float getLengthSq() const {
        return dot(*this); //x*x + y*y;
    };

    /** Calculates the square distance between two points (not calling sqrt() )
     @return float
     @since v2.1.4
    */
    inline float getDistanceSq(const CCPoint& other) const {
        return (*this - other).getLengthSq();
    };

    /** Calculates the distance between two points
     @return float
     @since v2.1.4
     */
    inline float getDistance(const CCPoint& other) const {
        return (*this - other).getLength();
    };

    /** @returns the angle in radians between this vector and the x axis
     @since v2.1.4
    */
    inline float getAngle() const {
        return atan2f(y, x);
    };

    /** @returns the angle in radians between two vector directions
     @since v2.1.4
    */
    inline float getAngle(const CCPoint& other) const {
        CCPoint a2 = normalize();
        CCPoint b2 = other.normalize();
        float angle = atan2f(a2.cross(b2), a2.dot(b2));
        if(fabs(angle) < FLT_EPSILON) return 0.f;
        return angle;
    }

    /** Calculates dot product of two points.
     @return float
     @since v2.1.4
     */
    inline float dot(const CCPoint& other) const {
        return x*other.x + y*other.y;
    };

    /** Calculates cross product of two points.
     @return float
     @since v2.1.4
     */
    inline float cross(const CCPoint& other) const {
        return x*other.y - y*other.x;
    };

    /** Calculates perpendicular of v, rotated 90 degrees counter-clockwise -- cross(v, perp(v)) >= 0
     @return CCPoint
     @since v2.1.4
     */
    inline CCPoint getPerp() const {
        return CCPoint(-y, x);
    };

    /** Calculates perpendicular of v, rotated 90 degrees clockwise -- cross(v, rperp(v)) <= 0
     @return CCPoint
     @since v2.1.4
     */
    inline CCPoint getRPerp() const {
        return CCPoint(y, -x);
    };

    /** Calculates the projection of this over other.
     @return CCPoint
     @since v2.1.4
     */
    inline CCPoint project(const CCPoint& other) const {
        return other * (dot(other)/other.dot(other));
    };

    /** Complex multiplication of two points ("rotates" two points).
     @return CCPoint vector with an angle of this.getAngle() + other.getAngle(),
     and a length of this.getLength() * other.getLength().
     @since v2.1.4
     */
    inline CCPoint rotate(const CCPoint& other) const {
        return CCPoint(x*other.x - y*other.y, x*other.y + y*other.x);
    };

    /** Unrotates two points.
     @return CCPoint vector with an angle of this.getAngle() - other.getAngle(),
     and a length of this.getLength() * other.getLength().
     @since v2.1.4
     */
    inline CCPoint unrotate(const CCPoint& other) const {
        return CCPoint(x*other.x + y*other.y, y*other.x - x*other.y);
    };

    /** Returns point multiplied to a length of 1.
     * If the point is 0, it returns (1, 0)
     @return CCPoint
     @since v2.1.4
     */
    inline CCPoint normalize() const {
        float length = getLength();
        if(length == 0.) return CCPoint(1.f, 0);
        return *this / getLength();
    };

    /** Linear Interpolation between two points a and b
     @returns
        alpha == 0 ? a
        alpha == 1 ? b
        otherwise a value between a..b
     @since v2.1.4
     */
    inline CCPoint lerp(const CCPoint& other, float alpha) const {
        return *this * (1.f - alpha) + other * alpha;
    };

    /** Rotates a point counter clockwise by the angle around a pivot
     @param pivot is the pivot, naturally
     @param angle is the angle of rotation ccw in radians
     @returns the rotated point
     @since v2.1.4
     */
    inline CCPoint rotateByAngle(const CCPoint& pivot, float angle) const {
        return pivot + (*this - pivot).rotate(CCPoint::forAngle(angle));
    }

    static inline CCPoint forAngle(const float a)
    {
    	return CCPoint(cosf(a), sinf(a));
    }
};

/**
 * @js NA
 */
class CC_DLL CCSize
{
    GEODE_FRIEND_MODIFY
public:
    float width;
    float height;

public:
    inline CCSize() : width(0), height(0) {}
    inline CCSize(float width, float height) : width(width), height(height) {}
    /**
     * @lua NA
     */
    inline CCSize(const CCSize& other) : width(other.width), height(other.height) {}
    /**
     * @lua NA
     */
    inline CCSize(const CCPoint& point) : width(point.x), height(point.y) {}
    /**
     * @lua NA
     */
    inline CCSize& operator= (const CCSize& other) {
        setSize(other.width, other.height);
        return *this;
    }
    /**
     * @lua NA
     */
    inline CCSize& operator= (const CCPoint& point) {
        setSize(point.x, point.y);
        return *this;
    }
    /**
     * @lua NA
     */
    inline CCSize operator+(const CCSize& right) const {
        return CCSize(this->width + right.width, this->height + right.height);
    }
    /**
     * @lua NA
     */
    inline CCSize operator-(const CCSize& right) const {
        return CCSize(this->width - right.width, this->height - right.height);
    }
    /**
     * @lua NA
     */
    inline CCSize operator*(float a) const {
        return CCSize(this->width * a, this->height * a);
    }
    /**
     * @lua NA
     */
    inline CCSize operator/(float a) const {
        return CCSize(this->width / a, this->height / a);
    }
    /**
     * @lua NA
     */
    inline void setSize(float width, float height) {
        this->width = width;
        this->height = height;
    }
    /**
     * @lua NA
     */
    inline bool equals(const CCSize& target) const {
        return (fabs(this->width  - target.width)  < FLT_EPSILON) && (fabs(this->height - target.height) < FLT_EPSILON);
    }
    /**
     * Get the aspect ratio of this CCSize
     * @note Geode addition
     */
    inline float aspect() const {
        return this->width / this->height;
    }
};

// alk cont

CCPoint::CCPoint(const CCSize& size) : x(size.width), y(size.height) {}

CCPoint& CCPoint::operator= (const CCSize& size) {
    setPoint(size.width, size.height);
    return *this;
}


/**
 * @js NA
 */
class CC_DLL CCRect
{
    GEODE_FRIEND_MODIFY
public:
    CCPoint origin;
    CCSize  size;

public:
    inline CCRect() {
        setRect(0.0f, 0.0f, 0.0f, 0.0f);
    }
    inline CCRect(float x, float y, float width, float height) {
        setRect(x, y, width, height);
    }
    /**
     * @lua NA
     */
    inline CCRect(const CCRect& other) {
        setRect(other.origin.x, other.origin.y, other.size.width, other.size.height);
    }
    /**
     * @lua NA
     */
    inline CCRect& operator= (const CCRect& other) {
        setRect(other.origin.x, other.origin.y, other.size.width, other.size.height);
        return *this;
    }
    inline void setRect(float x, float y, float width, float height) {
        // CGRect can support width<0 or height<0
        // CCAssert(width >= 0.0f && height >= 0.0f, "width and height of Rect must not less than 0.");

        origin.x = x;
        origin.y = y;

        size.width = width;
        size.height = height;
    }

    inline float getMinX() const {
        return origin.x;
    } /// return the leftmost x-value of current rect
    inline float getMidX() const {
        return (float)(origin.x + size.width / 2.0);
    } /// return the midpoint x-value of current rect
    inline float getMaxX() const {
        return (float)(origin.x + size.width);
    } /// return the rightmost x-value of current rect
    inline float getMinY() const {
        return origin.y;
    } /// return the bottommost y-value of current rect
    inline float getMidY() const {
        return (float)(origin.y + size.height / 2.0);
    } /// return the midpoint y-value of current rect
    inline float getMaxY() const {
        return origin.y + size.height;
    } /// return the topmost y-value of current rect
    inline bool equals(const CCRect& rect) const {
        return (origin.equals(rect.origin) && size.equals(rect.size));
    }
    inline bool containsPoint(const CCPoint& point) const {
        bool bRet = false;

        if (point.x >= getMinX() && point.x <= getMaxX()
            && point.y >= getMinY() && point.y <= getMaxY())
        {
            bRet = true;
        }

        return bRet;
    }

    inline bool intersectsRect(const CCRect& rect) const {
        // lmao
        return !(     getMaxX() < rect.getMinX() ||
                 rect.getMaxX() <      getMinX() ||
                      getMaxY() < rect.getMinY() ||
                 rect.getMaxY() <      getMinY());
    }
};


#define CCPointMake(x, y) CCPoint((float)(x), (float)(y))
#define CCSizeMake(width, height) CCSize((float)(width), (float)(height))
#define CCRectMake(x, y, width, height) CCRect((float)(x), (float)(y), (float)(width), (float)(height))


// const CCPoint CCPointZero = CCPointMake(0,0);
#define CCPointZero CCPointMake(0,0)

/* The "zero" size -- equivalent to CCSizeMake(0, 0). */ 
// const CCSize CCSizeZero = CCSizeMake(0,0);
#define CCSizeZero CCSizeMake(0,0)

/* The "zero" rectangle -- equivalent to CCRectMake(0, 0, 0, 0). */ 
// const CCRect CCRectZero = CCRectMake(0,0,0,0);
#define CCRectZero CCRectMake(0,0,0,0)

// end of data_structure group
/// @}

NS_CC_END

#endif // __CCGEMETRY_H__