/**
 * @file   solver.hpp
 * @author Julian Iseringhausen <isering@ins.uni-bonn.de>
 * @date   Mon Apr 18 13:11:14 2011
 *
 * @brief  VMG::Solver
 *
 */

#ifndef SOLVER_HPP_
#define SOLVER_HPP_

#include <vector>

#include "base/discretization.hpp"
#include "base/object.hpp"
#include "base/stencil.hpp"
#include "comm/comm.hpp"
#include "grid/grid.hpp"
#include "mg.hpp"

namespace VMG
{

class Solver : public Object
{
public:
  Solver()
  {
    size = 0;
  }

  Solver(int size) :
    size(size)
  {
    this->Realloc(size);
  }

  virtual ~Solver()
  {
  }

  void Run(Grid& sol, Grid& rhs);

  void Realloc(int n);
  void Realloc(Grid& x);

  vmg_float& Mat(int i, int j)
  {
    return A[j+size*i];
  }

  vmg_float& Rhs(int i)
  {
    return b[i];
  }

  vmg_float& Sol(int i)
  {
    return x[i];
  }

  const int& Size() const {return size;}

protected:
  virtual void Compute() = 0; ///< Solves the system of equations

private:
  virtual void AssembleMatrix(const Grid& rhs) = 0; ///< Assembles all matrices and vectors.
  virtual void ExportSol(Grid& sol, Grid& rhs) = 0; ///< Exports the solution back to a given mesh.

  std::vector<vmg_float> A, b, x;
  int size;
};

}

#endif