//
//  Vector2i.h
//
//  2-dimensional integer vector functions.
//

#pragma once
#ifndef ES_CORE_MATH_VECTOR2I_H
#define ES_CORE_MATH_VECTOR2I_H

#include <assert.h>

class Vector2i
{
public:
    Vector2i() {}
    Vector2i(const int _i) : mX(_i), mY(_i) {}
    Vector2i(const int _x, const int _y) : mX(_x), mY(_y) {}

    const bool operator==(const Vector2i& _other) const
            { return ((mX == _other.mX) && (mY == _other.mY)); }
    const bool operator!=(const Vector2i& _other) const
            { return ((mX != _other.mX) || (mY != _other.mY)); }

    const Vector2i operator+(const Vector2i& _other) const
            { return { mX + _other.mX, mY + _other.mY }; }
    const Vector2i operator-(const Vector2i& _other) const
            { return { mX - _other.mX, mY - _other.mY }; }
    const Vector2i operator*(const Vector2i& _other) const
            { return { mX * _other.mX, mY * _other.mY }; }
    const Vector2i operator/(const Vector2i& _other) const
            { return { mX / _other.mX, mY / _other.mY }; }

    const Vector2i operator+(const int& _other) const { return { mX + _other, mY + _other }; }
    const Vector2i operator-(const int& _other) const { return { mX - _other, mY - _other }; }
    const Vector2i operator*(const int& _other) const { return { mX * _other, mY * _other }; }
    const Vector2i operator/(const int& _other) const { return { mX / _other, mY / _other }; }

    const Vector2i operator-() const { return { -mX , -mY }; }

    Vector2i& operator+=(const Vector2i& _other) { *this = *this + _other; return *this; }
    Vector2i& operator-=(const Vector2i& _other) { *this = *this - _other; return *this; }
    Vector2i& operator*=(const Vector2i& _other) { *this = *this * _other; return *this; }
    Vector2i& operator/=(const Vector2i& _other) { *this = *this / _other; return *this; }

    Vector2i& operator+=(const int& _other) { *this = *this + _other; return *this; }
    Vector2i& operator-=(const int& _other) { *this = *this - _other; return *this; }
    Vector2i& operator*=(const int& _other) { *this = *this * _other; return *this; }
    Vector2i& operator/=(const int& _other) { *this = *this / _other; return *this; }

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

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

    static const Vector2i Zero() { return { 0, 0 }; }
    static const Vector2i UnitX() { return { 1, 0 }; }
    static const Vector2i UnitY() { return { 0, 1 }; }

private:
    int mX;
    int mY;
};

#endif // ES_CORE_MATH_VECTOR2I_H