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#ifndef __COCO_VTV_H

#define __COCO_VTV_H



#include <map>

#include <vector>

#include <assert.h>



#include <gsl/gsl_matrix.h>



#include "../cuda/cuda_interface.h"

#include "../defs.h"

#include "../modules.h"



using namespace std;





namespace coco {



  /*** CORE PDE METHODS ***/

  struct coco_vtv_workspace;



  // Helper structure to set all parameters

  struct coco_vtv_data

  {

    // Field size

    size_t _W;

    size_t _H;

    size_t _N;

    // Number of channels

    size_t _nchannels;



    // Smoothness parameter

    double _lambda;



    // Step sizes (primal/dual)

    double _tau;

    double _sigma;

    // Step sizes (fista)

    double _alpha;



    // Lipschitz constant

    double _L;

    // Uniform convexity constant

    double _gamma;



    // Regularizer

    // 0: TV_S

    // 1: TV_F

    // 2: TV_J

    size_t _regularizer;



    // Data term regularizer

    // 1: L^1 - norm

    // 2: L^2 - norm

    // Works only together with Arrow-Hurwicz or Chambolle-Pock,

    // and with general inverse problem

    size_t _data_term_p;



    // Number of bytes per image double layer

    size_t _nfbytes;

    // Workspace data

    coco_vtv_workspace* _workspace;

  };









  // Alloc PDE data with sensible defaults

  coco_vtv_data* coco_vtv_alloc( size_t nchannels,

				 vector<gsl_matrix*> F );

  // Free up PDE data

  bool coco_vtv_free( coco_vtv_data *data );





  // Initialize workspace with current solution

  bool coco_vtv_initialize( coco_vtv_data *data,

			    vector<gsl_matrix*> &U );



  // Get current solution

  bool coco_vtv_get_solution( coco_vtv_data *data,

			      vector<gsl_matrix*> &U );



  // Get dual variable XI (vector of dimension 2)

  bool coco_vtv_get_dual_xi( coco_vtv_data *data,

			     vector<gsl_matrix*> &XI,

			     size_t channel=0 );

  

  // Get dual variable ETA (vector of dimension equal to channel number)

  bool coco_vtv_get_dual_eta( coco_vtv_data *data,

			      vector<gsl_matrix*> &ETA );

  







  /*****************************************************************************

       TV_x ROF

  *****************************************************************************/



  // Compute primal energy

  double coco_vtv_rof_primal_energy( coco_vtv_data *data );



  // *** MTV-ROF base algorithms ***



  // Perform one iteration of Bermudez-Morena scheme

  bool coco_vtv_rof_iteration_bermudez_morena( coco_vtv_data *data );

  // Perform one iteration of Arrow-Hurwicz scheme

  bool coco_vtv_rof_iteration_arrow_hurwicz( coco_vtv_data *data );

  // Perform one iteration of Algorithm 1, Chambolle-Pock

  bool coco_vtv_rof_iteration_chambolle_pock_1( coco_vtv_data *data );

  // Perform one iteration of Algorithm 2, Chambolle-Pock

  bool coco_vtv_rof_iteration_chambolle_pock_2( coco_vtv_data *data );

  // Perform one iteration of FISTA

  bool coco_vtv_rof_iteration_fista( coco_vtv_data *data );







  /*****************************************************************************

       TV_x Deblurring

  *****************************************************************************/



  // Init kernel

  bool coco_vtv_set_separable_kernel( coco_vtv_data *data, gsl_vector *kernel );

  bool coco_vtv_set_kernel( coco_vtv_data *data, gsl_matrix *kernel );



  // Compute primal energy

  double coco_vtv_deblurring_primal_energy( coco_vtv_data *data );



  // Perform one primal step (several iterations of gradient descent for the prox operator)

  bool coco_vtv_deblurring_primal_step( coco_vtv_data *data );

  // Perform one primal step (several iterations of gradient descent for the prox operator)

  bool coco_vtv_deblurring_dual_step( coco_vtv_data *data );

  // Single primal descent step (using functional gradient only)

  bool coco_vtv_deblurring_primal_descent_step( coco_vtv_data *data );

  // Perform one iteration of Algorithm 1, Chambolle-Pock

  bool coco_vtv_deblurring_iteration_chambolle_pock_1( coco_vtv_data *data );

  // Perform one iteration of Algorithm 2, Chambolle-Pock

  bool coco_vtv_deblurring_iteration_chambolle_pock_2( coco_vtv_data *data );

  // Perform one iteration of Arrow-Hurwicz

  bool coco_vtv_deblurring_iteration_arrow_hurwicz( coco_vtv_data *data );



  // Perform one single shrinkage step (ISTA)

  bool coco_vtv_deblurring_ista_step( coco_vtv_data *data );

  // Perform one full iteration of FISTA

  bool coco_vtv_deblurring_iteration_fista( coco_vtv_data *data );





  /*****************************************************************************

       TV_x Inpainting

  *****************************************************************************/



  // Init inpainting stencil

  bool coco_vtv_set_stencil( coco_vtv_data *data, gsl_matrix *stencil );



  // Compute primal energy

  double coco_vtv_inpainting_primal_energy( coco_vtv_data *data );



  // Perform one single shrinkage step (ISTA)

  bool coco_vtv_inpainting_ista_step( coco_vtv_data *data );

  // Perform one full iteration of FISTA

  bool coco_vtv_inpainting_iteration_fista( coco_vtv_data *data );



}





#endif