#ifndef MATRIX_H
#define MATRIX_H MATRIX_H

#include "Vector.h"
#include <iostream>

class Matrix
{
    public:
        Matrix();
        typedef double Matrix_row_t[4];
        Matrix_row_t & operator[](int idx) { return m_matrix[idx]; }
        const Matrix_row_t & operator[](int idx) const { return m_matrix[idx]; }
        static Matrix identity();
        double determinant();
        Matrix getInverse();
        Matrix & operator*=(const Matrix & other);

    protected:
        double m_matrix[4][4];
        double m_inverse[4][4];
        bool m_inverse_calculated;
        bool m_inverse_valid;
        void calculateInverse();
};

Matrix operator*(const Matrix & m1, const Matrix & m2);
Vector operator*(const Matrix & m, const Vector & v); /* transform point */
Vector operator%(const Matrix & m, const Vector & v); /* transform direction */
bool operator==(const Matrix & m1, const Matrix & m2);
std::ostream & operator<<(std::ostream & out, const Matrix & m);

#endif