#ifndef _TRANSFORMMATRIX_H_
#define _TRANSFORMMATRIX_H_

#include <QtXml>
#pragma warning(disable: 4003)
#include "gmtl/gmtl.h"

namespace projection
{

/**
 * Transform matrix class.
 */
class TransformMatrix
{
public:

    /**
     * Constructor.
     *
     * Default transform matrix value is identity matrix.
     */
    TransformMatrix();

    /**
     * Destructor.
     */
    virtual ~TransformMatrix();

    /**
     * Set position of the transform matrix.
     *
     * @param pos Position of the transform matrix.
     */
    void setPosition(const gmtl::Vec3f& pos) { m_pos = pos; }

    /**
     * Retrieve the position of the transform matrix.
     *
     * @return Position of the transform matrix.
     */
    gmtl::Vec3f getPosition() const { return m_pos; }

    /**
     * Set rotation of the transform matrix.
     *
     * @param rot Rotation of the transform matrix.
     */
    void setRotation(const gmtl::Vec3f& rot) { m_rot = rot; }

    /**
     * Retrieve the rotation of the transform matrix.
     *
     * @return Rotation of the transform matrix.
     */
    gmtl::Vec3f getRotation() const { return m_rot; }

    /**
     * Set scaling of the transform matrix.
     *
     * @param scale Scaling of the transform matrix.
     */
    void setScaling(const gmtl::Vec3f& scale) { m_scale = scale; }

    /**
     * Retrieve the scaling of the transform matrix.
     *
     * @return Scaling of the transform matrix.
     */
    gmtl::Vec3f getScaling() const { return m_scale; }

    /**
     * Set whether using scale or not in the transform matrix.
     *
     * @param bUseScale True to use scaling in the transform matrix.
     */
    void setUseScaling(bool bUseScale) { m_bUseScale = bUseScale; }

    /**
     * Check whether using scale or not in the transform matrix.
     *
     * @return True if using scale in the transform matrix.
     */
    bool getUseScaling() const { return m_bUseScale; }

    /**
     * Retrieve the trasform matrix.
     *
     * @return Trasform matrix.
     */
    gmtl::Matrix44f getMatrix() const;

    /**
     * Retrieve the trasform matrix without scaling.
     *
     * @return Trasform matrix without scaling.
     */
    gmtl::Matrix44f getMatrixWOScaling() const;

    /**
    * Retrieve transform parameters like 'Rotate 45 1 0 0;'.
    *
    * @param numSpaces Number of space characters for indent.
    * @return Transform params.
    */
    QString getParams(int numSpaces=0) const;

    /**
     * Assignment operator.
     *
     * @param m Assignment source transform matrix.
     */
    TransformMatrix& operator=(const TransformMatrix& m)
    {
        m_pos = m.m_pos;
        m_rot = m.m_rot;
        m_scale = m.m_scale;
        return *this;
    }

    /**
     * Equal operator.
     *
     * @param a Operand transform matrix.
     * @param b Operand transform matrix.
     */
    friend bool operator==(const TransformMatrix &a, const TransformMatrix &b)
    {
        return (a.m_pos == b.m_pos && a.m_rot == b.m_rot && a.m_scale == b.m_scale);
    }

    /**
     * Not equal operator.
     *
     * @param a Operand transform matrix.
     * @param b Operand transform matrix.
     */
    friend bool operator!=(const TransformMatrix &a, const TransformMatrix &b)
    {
        return !(a==b);
    }

    /**
     * Restore the transform matrix from XML data.
     *
     * @param element Parent XML element of the transform matrix data.
     */
	virtual void initFromDOMElement(const QDomElement& element);

    /**
     * Store the current transform matrix as XML data.
     *
     * @param name XML node name of the data.
     * @param doc XML document to store the data.
     * @return Current transform matrix data as XML data.
     */
    virtual QDomElement domElement(const QString& name, QDomDocument& doc) const;

    /**
     * Reset the matrix.
     */
    void reset();

private:

    bool m_bUseScale;

    gmtl::Vec3f m_pos;      //!< Position of the tranform matrix.
	gmtl::Vec3f m_rot;      //!< Rotation of the tranform matrix.
	gmtl::Vec3f m_scale;    //!< Scaling of the tranform matrix.

    double m_mat[16];       //!< Matrix values. Calculated when getMatrix() called.
};

}; // projection

#endif // _TRANSFORMMATRIX_H_