#ifndef SPECTRE_MATH_VECTOR4_H
#define SPECTRE_MATH_VECTOR4_H

#include <iostream>

namespace sp {

template <typename T>
struct Vector4
{
	union {
		struct { 
			T x, y, z, w;
		};
		T v[4];
	};

	inline Vector4();

	inline Vector4(T s);

	inline Vector4(T x, T y, T z);

	inline Vector4(T x, T y, T z, T w);

	template <typename U>
	inline Vector4(const Vector4<U>& vec);

	// Named operations

	inline float length() const;

	inline Vector4<T>& normalize();
};

// ---------
//  Compare
// ---------

template <typename T>
inline bool operator==(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline bool operator!=(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline bool operator<(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline bool operator<=(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline bool operator>(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline bool operator>=(const Vector4<T>& a, const Vector4<T>& b);

// ------------
//  Arithmetic
// ------------

template <typename T>
inline Vector4<T> operator+(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T> operator-(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T> operator/(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T> operator*(const Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T>& operator+=(Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T>& operator-=(Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T>& operator/=(Vector4<T>& a, const Vector4<T>& b);

template <typename T>
inline Vector4<T>& operator*=(Vector4<T>& a, const Vector4<T>& b);

// -------------------
//  Scalar Arithmetic
// -------------------

template <typename T>
inline Vector4<T> operator+(const Vector4<T>& v, T s);

template <typename T>
inline Vector4<T> operator+(T s, const Vector4<T>& v);

template <typename T>
inline Vector4<T> operator-(const Vector4<T>& v, T s);

template <typename T>
inline Vector4<T> operator-(T s, const Vector4<T>& v);

template <typename T>
inline Vector4<T> operator/(const Vector4<T>& v, T s);

template <typename T>
inline Vector4<T> operator/(T s, const Vector4<T>& v);

template <typename T>
inline Vector4<T> operator*(const Vector4<T>& v, T s);

template <typename T>
inline Vector4<T> operator*(T s, const Vector4<T>& v);

// ----------------
//  Scalar compare
// ----------------

template <typename T>
inline bool operator<(const Vector4<T>& v, T s);

template <typename T>
inline bool operator<(T s, const Vector4<T>& v);

template <typename T>
inline bool operator<=(const Vector4<T>& v, T s);

template <typename T>
inline bool operator<=(T s, const Vector4<T>& v);

template <typename T>
inline bool operator>(const Vector4<T>& v, T s);

template <typename T>
inline bool operator>(T s, const Vector4<T>& v);

template <typename T>
inline bool operator>=(const Vector4<T>& v, T s);

template <typename T>
inline bool operator>=(T s, const Vector4<T>& v);

// Stream

template <typename T>
inline std::ostream& operator<<(std::ostream &s, const Vector4<T>& v);

typedef Vector4<float>		Vector4f;
typedef Vector4<int>		Vector4i;
typedef Vector4<unsigned>	Vector4u;
typedef Vector4<unsigned char>	Vector4b;

typedef Vector4<float>		vec4f;
typedef Vector4<int>		vec4i;
typedef Vector4<unsigned>	vec4u;
typedef Vector4<unsigned char>	vec4b;

} // namespace sp

#include "Vector4.inl"

#endif /* SPECTRE_MATH_VECTOR4_H */