/* This file is part of Lemma, a geophysical modelling and inversion API */

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/**
  @file
  @author   Trevor Irons
  @date     10/28/2010
  @version  $Id: rectilineargrid.h 193 2014-11-10 23:51:41Z tirons $
 **/

#ifndef  RECTILINEARGRID_INC
#define  RECTILINEARGRID_INC

#include "Grid.h"

namespace Lemma {

    /**
     * \ingroup LemmaCore
     * \brief   Impliments a rectilinear grid.
     * \details A rectilinear grid can vary regularily in space but must be
     *         constant variation across each dimension. In this way three
     *         vectors can define the entire grid, and each cell is right
     *         aligned with all its neighbours.
     */
    class RectilinearGrid : public Grid {

        friend std::ostream &operator<<(std::ostream &stream,
			const RectilinearGrid &ob);

        /*
         *  This key is used to lock the constructors
         */
        //struct ctor_key {};

        public:

            // ====================  LIFECYCLE     =======================

            /**
             * DeSerializing constructor.
             * @note This method is locked, and cannot be called directly.
             *       The reason that the method is public is to enable the use
             *       of make_shared whilst enforcing the use of shared_ptr,
             *       in c++-17, this curiosity may be resolved.
             * @see RectilinearGrid::NewSP
             */
            explicit RectilinearGrid ( const ctor_key& );

            /**
             * DeSerializing constructor.
             * @note This method is locked, and cannot be called directly.
             *       The reason that the method is public is to enable the use
             *       of make_shared whilst enforcing the use of shared_ptr,
             *       in c++-17, this curiosity may be resolved.
             * @see DeSerialize
             */
            explicit RectilinearGrid (const YAML::Node& node, const ctor_key& );

            /** Default destructor.
             *  @note This should never be called explicitly, use NewSP
             */
            virtual ~RectilinearGrid ();

            /**
             *  Uses YAML to serialize this object.
             *  @return a YAML::Node
             */
            virtual YAML::Node Serialize() const;

            /**
             *  Factory method for generating concrete class.
             *  @return a std::shared_ptr of type RectilinearGrid
             */
            static std::shared_ptr<RectilinearGrid> NewSP();

            /**
             *   Constructs an object from a YAML::Node.
             */
            static std::shared_ptr< RectilinearGrid > DeSerialize(const YAML::Node& node);

            // ====================  OPERATORS     =======================

            // ====================  OPERATIONS    =======================

            /**
             *  Sets the dimensions in x, y and z
             *  @param[in] nx is the number of cells in x
             *  @param[in] ny is the number of cells in y
             *  @param[in] nz is the number of cells in z
             */
            void SetDimensions (const int &nx, const int &ny, const int &nz);

            /**
             *  Sets the offset in x, y and z. This sets the corner position of the top SW corner.
             *  @param[in] ox is the number of cells in x
             *  @param[in] oy is the number of cells in y
             *  @param[in] oz is the number of cells in z
             */
            void SetOffset (const Real &ox, const Real &oy, const Real &oz);

            /**
             *  Sets the spacing in x, y and z
             *  @param[in] dx is a Vector of cell spacing in x, must be same
             *  size ad nx
             *  @param[in] dy is a Vector of cell spacing in x, must be same
             *  size ad ny
             *  @param[in] dz is a Vector of cell spacing in x, must be same
             *  size ad nz
             */
            void SetSpacing (const VectorXr &dx, const VectorXr &dy,
                const VectorXr &dz);


            // ====================  ACCESS        =======================

            /** Returns the number of cells in x
             *  @return number of cells in x
             */
            int GetNx();

            /** Returns the number of cells in y
             *  @return number of cells in y
             */
            int GetNy();

            /** Returns the number of cells in z
             *  @return number of cells in z
             */
            int GetNz();

            /** Returns the offset of cells in x
             *  @return offset of cells in x
             */
            Real GetOx();

            /** Returns the number of cells in y
             *  @return number of cells in y
             */
            Real GetOy();

            /** Returns the offset of cells in z
             *  @return offset of cells in z
             */
            Real GetOz();

            /** Returns Spacing Vector
             *  @return dx
             */
            VectorXr GetDx();

            /** Returns a spacing
             *  @return dx[ix]
             */
            Real GetDx1(const int& ix);

            /** Returns Spacing Vector
             *  @return dy
             */
            VectorXr GetDy();

            /** Returns a spacing
             *  @return dy[iy]
             */
            Real GetDy1(const int& iy);

            /** Returns Spacing Vector
             *  @return dz
             */
            VectorXr GetDz();

            /** Returns Spacing Vector
             *  @return dz[iz]
             */
            Real GetDz1(const int& iz);

            // ====================  INQUIRY       =======================

            /** Returns the name of the underlying class, similiar to Python's type */
            virtual std::string GetName() const;

        protected:

            // ====================  LIFECYCLE     =======================

        private:

            /** ASCII string representation of the class name */
            static constexpr auto CName = "RectilinearGrid";

            // ====================  DATA MEMBERS  =========================

            /// Number of cells in the x dimension
            int nx;

            /// Number of cells in the y dimension
            int ny;

            /// Number of cells in the z dimension
            int nz;

            /// Grid offset in x dimension
            Real ox;

            /// Grid offset in y dimension
            Real oy;

            /// Grid offset in z dimension
            Real oz;

            /// Cell spacing in the x dimension
            VectorXr dx;

            /// Cell spacing in the y dimension
            VectorXr dy;

            /// Cell spacing in the z dimension
            VectorXr dz;

    }; // -----  end of class  RectilinearGrid  -----

}		// -----  end of Lemma  name  -----

#endif   // ----- #ifndef RECTILINEARGRID_INC  -----

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