/*
*	Copyright (C) 2010 Thorsten Liebig (Thorsten.Liebig@gmx.de)
*
*	This program is free software: you can redistribute it and/or modify
*	it under the terms of the GNU General Public License as published by
*	the Free Software Foundation, either version 3 of the License, or
*	(at your option) any later version.
*
*	This program is distributed in the hope that it will be useful,
*	but WITHOUT ANY WARRANTY; without even the implied warranty of
*	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*	GNU General Public License for more details.
*
*	You should have received a copy of the GNU General Public License
*	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef OPERATOR_BASE_H
#define OPERATOR_BASE_H

#include "tools/global.h"
#include "Common/processing.h"
#include "string"

//! Abstract base-class for a common operator
class Operator_Base
{
public:
	//! Get the timestep used by this operator
	virtual double GetTimestep() const {return dT;};

	//! Get the number of cells or nodes defined by this operator
	virtual double GetNumberCells() const =0;

	//! Get the number of timesteps satisfying the nyquist condition (may depend on the excitation)
	virtual unsigned int GetNumberOfNyquistTimesteps() const =0;

	//! Returns the number of lines as needed for post-processing etc. (for the engine, use GetOriginalNumLines())
	virtual unsigned int GetNumberOfLines(int ny) const =0;

	//! Get the name for the given direction: 0 -> x, 1 -> y, 2 -> z
	virtual std::string GetDirName(int ny) const;

	//! Get the grid drawing unit in m
	virtual double GetGridDelta() const =0;

	//! Get the disc line in \a n direction (in drawing units)
	virtual double GetDiscLine(int n, unsigned int pos, bool dualMesh=false) const =0;

	//! Get the node width for a given direction \a n and a given mesh position \a pos
	virtual double GetNodeWidth(int ny, const unsigned int pos[3], bool dualMesh = false) const =0;

	//! Get the node area for a given direction \a n and a given mesh position \a pos
	virtual double GetNodeArea(int ny, const unsigned int pos[3], bool dualMesh = false) const =0;

	//! Get the length of an FDTD edge (unit is meter).
	virtual double GetEdgeLength(int ny, const unsigned int pos[3], bool dualMesh = false) const =0;

	//! Get the area around an edge for a given direction \a n and a given mesh posisition \a pos
	/*!
		This will return the area around an edge with a given direction, measured at the middle of the edge.
		In a cartesian mesh this is equal to the NodeArea, may be different in other coordinate systems.
	*/
	virtual double GetEdgeArea(int ny, const unsigned int pos[3], bool dualMesh = false) const =0;

	//! Snap the given coodinates to mesh indices
	virtual bool SnapToMesh(const double* coord, unsigned int* uicoord, bool lower=false, bool* inside=NULL) const =0;

	//! Set the boundary conditions
	virtual void SetBoundaryCondition(int* BCs) {for (int n=0; n<6; ++n) m_BC[n]=BCs[n];}

protected:
	Operator_Base();
	virtual ~Operator_Base();

	virtual void Init();
	virtual void Reset();

	//! boundary conditions
	int m_BC[6];

	//! The operator timestep
	double dT;

	Processing::MeshType m_MeshType;
	unsigned int numLines[3];
	double* discLines[3];
	double gridDelta;
};

#endif // OPERATOR_BASE_H