//
//  Vector2f.h
//
//  2-dimensional floating point vector functions.
//

#pragma once
#ifndef ES_CORE_MATH_VECTOR2F_H
#define ES_CORE_MATH_VECTOR2F_H

#include "math/Misc.h"

#include <assert.h>

class Vector3f;
class Vector4f;

class Vector2f
{
public:
    Vector2f() {}
    Vector2f(const float _f) : mX(_f), mY(_f) {}
    Vector2f(const float _x, const float _y) : mX(_x), mY(_y) {}
    explicit Vector2f(const Vector3f& _v) : mX(((Vector2f&)_v).mX), mY(((Vector2f&)_v).mY) {}
    explicit Vector2f(const Vector4f& _v) : mX(((Vector2f&)_v).mX), mY(((Vector2f&)_v).mY) {}

    const bool operator==(const Vector2f& _other) const
            { return ((mX == _other.mX) && (mY == _other.mY)); }
    const bool operator!=(const Vector2f& _other) const
            { return ((mX != _other.mX) || (mY != _other.mY)); }

    const Vector2f operator+(const Vector2f& _other) const
            { return { mX + _other.mX, mY + _other.mY }; }
    const Vector2f operator-(const Vector2f& _other) const
            { return { mX - _other.mX, mY - _other.mY }; }
    const Vector2f operator*(const Vector2f& _other) const
            { return { mX * _other.mX, mY * _other.mY }; }
    const Vector2f operator/(const Vector2f& _other) const
            { return { mX / _other.mX, mY / _other.mY }; }

    const Vector2f operator+(const float& _other) const { return { mX + _other, mY + _other }; }
    const Vector2f operator-(const float& _other) const { return { mX - _other, mY - _other }; }
    const Vector2f operator*(const float& _other) const { return { mX * _other, mY * _other }; }
    const Vector2f operator/(const float& _other) const { return { mX / _other, mY / _other }; }

    const Vector2f operator-() const { return { -mX , -mY }; }

    Vector2f& operator+=(const Vector2f& _other) { *this = *this + _other; return *this; }
    Vector2f& operator-=(const Vector2f& _other) { *this = *this - _other; return *this; }
    Vector2f& operator*=(const Vector2f& _other) { *this = *this * _other; return *this; }
    Vector2f& operator/=(const Vector2f& _other) { *this = *this / _other; return *this; }

    Vector2f& operator+=(const float& _other) { *this = *this + _other; return *this; }
    Vector2f& operator-=(const float& _other) { *this = *this - _other; return *this; }
    Vector2f& operator*=(const float& _other) { *this = *this * _other; return *this; }
    Vector2f& operator/=(const float& _other) { *this = *this / _other; return *this; }

    float& operator[](const int _index)
            { assert(_index < 2 && "index out of range"); return (&mX)[_index]; }
    const float& operator[](const int _index) const
            { assert(_index < 2 && "index out of range"); return (&mX)[_index]; }

    inline float& x() { return mX; }
    inline float& y() { return mY; }
    inline const float& x() const { return mX; }
    inline const float& y() const { return mY; }

    Vector2f& round();
    Vector2f& lerp (const Vector2f& _start, const Vector2f& _end, const float _fraction);

    static const Vector2f Zero() { return { 0, 0 }; }
    static const Vector2f UnitX() { return { 1, 0 }; }
    static const Vector2f UnitY() { return { 0, 1 }; }

private:
    float mX;
    float mY;
};

#endif // ES_CORE_MATH_VECTOR2F_H