/* 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     06-13-2016
 **/

#ifndef __LEMMAOBJECT_H
#define __LEMMAOBJECT_H

#include "helper.h"
#include "lemma.h"

#ifdef HAVE_YAMLCPP
#include "yaml-cpp/yaml.h"
#endif

#include <memory>

namespace Lemma {

/** \brief    Abstract class providing common interface for Lemma Objects.
  * \details  Lemma objects can be members of other Lemma, and may be members
  *           of multiple objects. Since updates should be atomic, and objects
  *           can be large, it becomes useful to count the number of
  *           Classes an object is a member of.
  *           Before C++-11, this was done internally in Lemma, with the inclusion of
  *           more sophisticated smart pointers, this logic has been offloaded to the
  *           standard. All Lemma objects should be created as C++-11 Smart pointers, using
  *           the supplied New method. Calls to Delete are no longer necessary or available.
  */
class LemmaObject {

    /** Recursively prints information about this object
     */
    friend std::ostream &operator<<(std::ostream &stream, const LemmaObject &ob);

    #ifdef HAVE_YAMLCPP
    friend YAML::Emitter& operator << (YAML::Emitter& out, const LemmaObject &ob) ;
    #endif

    friend class LemmaObjectDeleter;

    public:

        // ====================  LIFECYCLE     ==============================
        //virtual std::shared_ptr<LemmaObject> NewSP() const = 0;

        // Needed because many derived classes have Eigen vectors as members,
        // causing alignment issues when vectorisation is enabled.
        EIGEN_MAKE_ALIGNED_OPERATOR_NEW

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

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

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

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

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

        #ifdef HAVE_YAMLCPP
        /**
         *  Uses YAML to serialize this object.
         *  @return a YAML::Node
         *  FOR NOT LemmaObject does not write out any YAML info,
         *      in the future the reference count could be logged? But the utility
         *      of that is minimal.
         *  @note Not every Lemma class needs to be Serializable, for instance HankelTransform
         *        classes will never need to be Serialized. There may be a need to differentiate these
         *        two families in to a LemmaInternalClass without serializing and perhaps this class for
         *        all external classes that might need to be serialized.
         */
        virtual YAML::Node Serialize() const {
            return YAML::Node();
        };
        #endif

    protected:

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

        /** Protected default constructor. This is an abstract class and
         *  cannot be instantiated.
         */
        LemmaObject (const std::string &name);

        #ifdef HAVE_YAMLCPP
        /** Protected DeDerializing constructor, use factory DeSerialize  method*/
        LemmaObject (const YAML::Node& node);
        #endif

        /** Protected default destructor. This is an abstract class and
         *  cannot be instantiated.
         */
        virtual ~LemmaObject();

    private:

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

        /** Stores an ASCII string representation of the class name */
        std::string Name;

}; // -----  end of class  LemmaObject  -----

class LemmaObjectDeleter
{
    public:
        void operator()(LemmaObject* p) { delete p; }
};

    /////////////////////////////////////////////////////////////////
    // BOILERPLATE MACROS
    #define DESERIALIZECHECK( node, Object ) { \
        if (node.Tag() != Object->GetName()) {  \
            throw  DeSerializeTypeMismatch(Object, node.Tag()) ; \
        } } \

    /////////////////////////////////////////////////////////////////
    // Error Classes

    /** Error called when DeSerializing breaks. If the node type is not the expected one
     *  this error is thown.
     */
    class DeSerializeTypeMismatch : public std::runtime_error {
        public:
            DeSerializeTypeMismatch(LemmaObject *ptr, const std::string& got);

    };

    /** If an assignment is made that is out of bounts, throw this.
     */
    class AssignmentOutOfBounds : public std::runtime_error {
        public:
            /** Throw when an assignment is out of bounds.
             *  @param[in] ptr is a pointer to the class throwing the exception.
             */
            AssignmentOutOfBounds(LemmaObject *ptr);
    };

    /** If a pointer to a class is requested, but it is NULL valued, throw this
     */
    class RequestToReturnNullPointer : public std::runtime_error {
        public:
            /** Thrown when the pointer is NULL
             *  @param[in] ptr is a pointer to the class throwing the exception.
             */
            RequestToReturnNullPointer(LemmaObject *ptr);
    };

    /** If an error in opening a .mat file is encountered, throw this.
     */
    class MatFileCannotBeOpened : public std::runtime_error {
        /** thown when a mat file fails to be opened.
         */
            public: MatFileCannotBeOpened();
    };

	/** Generic file I/O error. */
	class GenericFileIOError : public std::runtime_error {
			public: GenericFileIOError(LemmaObject *ptr, const std::string &filename);
	};

}
#endif // __LEMMAOBJECT_H