/*
 * This file is a part of morm
 * and is distributed under the 2-Clause BSD licence.
 * Author: Tomasz Sowa <t.sowa@ttmath.org>
 */

/*
 * Copyright (c) 2018-2019, Tomasz Sowa
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef headerfile_morm_model
#define headerfile_morm_model

#include <string>

#include "textstream/textstream.h"
#include "modelconnector.h"
#include "dbexpression.h"
#include "flatexpression.h"
#include "modelenv.h"



namespace morm
{


class Model
{
public:

	enum SaveMode
	{
		DO_INSERT_ON_SAVE,
		DO_UPDATE_ON_SAVE,
		DO_DELETE_ON_SAVE,
		DO_NOTHING_ON_SAVE,
	};

	virtual void     set_save_mode(SaveMode save_mode);
	virtual SaveMode get_save_mode();

	virtual void mark_to_delete();
	virtual void mark_to_remove();

	virtual void mark_to_insert();
	virtual void mark_to_update();

	virtual bool object_exists();
	virtual bool found();


	void set_connector(ModelConnector & connector);
	void set_connector(ModelConnector * connector);


	/*
	 * map fields to names
	 *
	 *
	 */
	virtual void map_fields() = 0;
	virtual void map_doc_fields() {} ;



	/*
	 *
	 * we can use the object for a different purpose than database (e.g. json)
	 * so let the table_name be non pure-virtual
	 *
	 */
	virtual void table_name(PT::TextStream & stream);
	virtual void table_name_for_join_as(PT::TextStream & stream);

	virtual void to_text(PT::TextStream & stream, ModelData * model_data, bool clear_stream = true);
	virtual void to_text(PT::TextStream & stream, ModelData & model_data, bool clear_stream = true);
	virtual void to_text(PT::TextStream & stream, bool clear_stream = true);

	virtual void to_text(std::string & str, ModelData * model_data, bool clear_string = true);
	virtual void to_text(std::string & str, ModelData & model_data, bool clear_string = true);
	virtual void to_text(std::string & str, bool clear_string = true);

	virtual std::string to_text();
	virtual std::string to_string();

	virtual void generate_insert_query(PT::TextStream & stream); // FIX ME needed model_data
	virtual bool insert(ModelData * model_data = nullptr);
	virtual bool insert(ModelData & model_data);

	virtual void generate_update_query(PT::TextStream & stream); // FIX ME needed model_data
	virtual bool update(ModelData * model_data = nullptr);
	virtual bool update(ModelData & model_data);

	virtual void generate_remove_query(PT::TextStream & stream); // FIX ME needed model_data
	virtual bool remove(ModelData * model_data = nullptr);
	virtual bool remove(ModelData & model_data);

	virtual bool save(ModelData * model_data = nullptr);
	virtual bool save(ModelData & model_data);

	virtual void generate_select_columns(PT::TextStream & stream, const std::string & column_prefix);

	virtual void generate_doc_for_flat(PT::TextStream & stream, bool clear_stream = true);
	virtual void generate_doc_for_db(PT::TextStream & stream, bool clear_stream = true);

	// set object to default values
	virtual void clear();

	// we need a pointer to ModelData here?
	virtual void prepare_to_select();


protected:

	ModelConnector * model_connector;
	SaveMode save_mode;
	ModelEnv * model_env;



	Model();
	Model(const Model & m);
	virtual ~Model();

	virtual void before_select();
	virtual void before_insert();
	virtual void before_update();
	virtual void before_remove();

	virtual void after_select();
	virtual void after_insert();
	virtual void after_update();
	virtual void after_remove();

	virtual void after_select_failure();
	virtual void after_insert_failure();
	virtual void after_update_failure();
	virtual void after_remove_failure();

	virtual int get_connector_mode();

	virtual ModelData * get_model_data();


	virtual void map_values_from_query();


	/////////////////////////////////

	void field(const wchar_t * field_name, char & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, unsigned char & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, std::wstring & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * field_name, wchar_t * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * field_name, std::string & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * field_name, char * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * field_name, bool & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, short & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, unsigned short & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, int & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, unsigned int & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, unsigned long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, long long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, unsigned long long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, float & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, double & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, long double & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * field_name, void * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * field_name, PT::Date & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(field_name, field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * field_name, Model & field_value, bool insertable = true, bool updatable = true)
	{
		field_model(field_name, field_name, field_value, insertable, updatable, true);
	}

	template<typename ModelClass>
	void field(const wchar_t * field_name, std::list<ModelClass> & field_value, bool insertable = true, bool updatable = true)
	{
		ModelClass * list_model_null_pointer = nullptr;
		field_list(field_name, field_name, field_value, list_model_null_pointer, insertable, updatable);
	}


//////////////////////

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, char & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned char & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::wstring & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, wchar_t * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::string & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, char * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, bool & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, short & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned short & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, int & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned int & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, long long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned long long & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, float & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, double & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, long double & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}

//	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, void * field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
//	{
//		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
//	}

	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, PT::Date & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		field_generic(db_field_name, flat_field_name, field_value, insertable, updatable, is_primary_key);
	}


	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_value, bool insertable = true, bool updatable = true)
	{
		field_model(db_field_name, flat_field_name, field_value, insertable, updatable, true);
	}

	template<typename ModelClass>
	void field(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::list<ModelClass> & field_value, bool insertable = true, bool updatable = true)
	{
		ModelClass * list_model_null_pointer = nullptr;
		field_list(db_field_name, flat_field_name, field_value, list_model_null_pointer, insertable, updatable);
	}

//////////////////////
	void doc(const wchar_t * field_name, char & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, unsigned char & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, std::wstring & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

//	void doc(const wchar_t * field_name, wchar_t * field_value)
//	{
//		doc_field_generic(field_name, field_name, field_value);
//	}

	void doc(const wchar_t * field_name, std::string & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

//	void doc(const wchar_t * field_name, char * field_value)
//	{
//		doc_field_generic(field_name, field_name, field_value);
//	}

	void doc(const wchar_t * field_name, bool & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, short & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, unsigned short & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, int & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, unsigned int & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, long & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, unsigned long & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, long long & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, unsigned long long & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, float & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, double & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, long double & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

//	void doc(const wchar_t * field_name, void * field_value)
//	{
//		doc_field_generic(field_name, field_name, field_value);
//	}

	void doc(const wchar_t * field_name, PT::Date & field_value)
	{
		doc_field_generic(field_name, field_name, field_value);
	}

	void doc(const wchar_t * field_name, Model & field_value)
	{
		doc_field_model(field_name, field_name, field_value);
	}

	template<typename ModelClass>
	void doc(const wchar_t * field_name, std::list<ModelClass> & field_value)
	{
		doc_field_list(field_name, field_name, field_value);
	}


//////////////////////

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, char & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned char & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::wstring & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

//	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, wchar_t * field_value)
//	{
//		doc_field_generic(db_field_name, flat_field_name, field_value);
//	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::string & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

//	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, char * field_value)
//	{
//		doc_field_generic(db_field_name, flat_field_name, field_value);
//	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, bool & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, short & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned short & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, int & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned int & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, long & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned long & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, long long & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, unsigned long long & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, float & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, double & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, long double & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}

//	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, void * field_value)
//	{
//		doc_field_generic(db_field_name, flat_field_name, field_value);
//	}

	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, PT::Date & field_value)
	{
		doc_field_generic(db_field_name, flat_field_name, field_value);
	}


	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_value)
	{
		doc_field_model(db_field_name, flat_field_name, field_value);
	}

	template<typename ModelClass>
	void doc(const wchar_t * db_field_name, const wchar_t * flat_field_name, std::list<ModelClass> & field_value)
	{
		doc_field_list(db_field_name, flat_field_name, field_value);
	}

//////////////////////


protected:


	template<typename FieldValue>
	void field_generic(const wchar_t * db_field_name, const wchar_t * flat_field_name, FieldValue & field_value, bool insertable, bool updatable, bool is_primary_key)
	{
		if( model_connector && model_env )
		{
			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING )
			{
				FlatConnector * flat_connector = model_connector->get_flat_connector();

				if( flat_connector )
				{
					FlatExpression * flat_expression = flat_connector->get_expression();

					if( flat_expression && !is_empty_field(flat_field_name) )
					{
						// insertable, updatable and is_primary_key are ignored here
						flat_expression->field(flat_field_name, field_value, insertable, updatable, is_primary_key, true, model_env);
					}
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					DbExpression * db_expression = db_connector->get_expression();

					if( db_expression && !is_empty_field(db_field_name) )
					{
						db_expression->field(db_field_name, field_value, insertable, updatable, is_primary_key, true, model_env);
					}
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_READING_VALUE_FROM_DB_RESULTSET )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					if( !is_empty_field(db_field_name) )
					{
						if( model_env->model_data && model_env->cursor_helper && model_env->cursor_helper->has_autogenerated_select )
						{
							get_value_by_field_index(model_env->cursor_helper->current_column, field_value);
							model_env->cursor_helper->current_column += 1;
						}
						else
						{
							get_value_by_field_name(db_field_name, field_value);
						}
					}
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_CLEARING_VALUE )
			{
				Clearer * clearer = model_connector->get_clearer();

				if( clearer )
				{
					clearer->clear_value(field_value);
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DOC_FOR_FLAT )
			{
				FlatConnector * doc_connector = model_connector->get_doc_connector(); // different connector will be here (doc, flat)

				if( doc_connector )
				{
					FlatExpression * doc_expression = doc_connector->get_expression();

					// potrzebujemy dwa rozne doce, jeden dla flat drugi dla bazy danych
					if( doc_expression && !is_empty_field(flat_field_name) )
					{
						// insertable, updatable and is_primary_key are ignored here
						doc_expression->field_doc(*this, flat_field_name, field_value, insertable, updatable, is_primary_key);
					}
				}
			}
		}
	}


	void field_model_left_join(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key, DbExpression * db_expression)
	{
		if( model_env->finder_helper )
		{
			//model_env->select_helper->morm_current_max_column += 1;
			model_env->finder_helper->morm_foreign_keys.clear();

			model_env->finder_helper->morm_finder_join_tables << "LEFT JOIN ";
			field_model.table_name(model_env->finder_helper->morm_finder_join_tables);
			model_env->finder_helper->morm_finder_join_tables << " AS ";


			//////////////
			PT::TextStream join_table_name_this;
			table_name_for_join_as(join_table_name_this);

			if( model_env->table_index > 1 )
				join_table_name_this << model_env->table_index;

			///////////

			PT::TextStream join_table_name;
			field_model.table_name_for_join_as(join_table_name);

			field_model.model_env->table_index = model_env->finder_helper->add_join_table(join_table_name);

			if( field_model.model_env->table_index > 1 )
				join_table_name << field_model.model_env->table_index;
			//////////


			model_env->finder_helper->morm_finder_join_tables << join_table_name;

			int expr_work_mode = db_expression->get_work_mode();
			int expr_output_type = db_expression->get_output_type();

			db_expression->set_work_mode(MORM_WORK_MODE_MODEL_SAVE_FIELDS);
			db_expression->set_output_type(MORM_OUTPUT_TYPE_JOIN_TABLES);

			db_expression->allow_to_use_prefix(false);

			if( has_foreign_key )
			{
				field_model.map_fields();

				model_env->finder_helper->morm_finder_join_tables << " ON " << join_table_name_this << '.' << db_field_name; // escape?
				model_env->finder_helper->morm_finder_join_tables << " = " << join_table_name << '.';

				if( !model_env->finder_helper->morm_foreign_keys.empty() )
				{
					model_env->finder_helper->morm_finder_join_tables << model_env->finder_helper->morm_foreign_keys.front();
				}
			}
			else
			{
				map_fields();

				model_env->finder_helper->morm_finder_join_tables << " ON " << join_table_name_this << '.';

				if( !model_env->finder_helper->morm_foreign_keys.empty() )
				{
					model_env->finder_helper->morm_finder_join_tables << model_env->finder_helper->morm_foreign_keys.front();
				}

				model_env->finder_helper->morm_finder_join_tables << " = " << (join_table_name) << '.' << db_field_name;
			}

			model_env->finder_helper->morm_finder_join_tables << ' ';

			db_expression->set_work_mode(expr_work_mode);
			db_expression->set_output_type(expr_output_type);

			db_expression->allow_to_use_prefix(true);

		}
	}



	void field_model_generate_flat_string(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		FlatConnector * flat_connector = model_connector->get_flat_connector();

		if( flat_connector )
		{
			FlatExpression * flat_expression = flat_connector->get_expression();

			if( flat_expression && !is_empty_field(flat_field_name) )
			{
				field_model.model_env->model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING;
				flat_expression->field_model(flat_field_name, field_model, insertable, updatable, false);
			}
		}
	}


	void field_model_generate_db_sql(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		DbConnector * db_connector = model_connector->get_db_connector();

		if( db_connector )
		{
			DbExpression * db_expression = db_connector->get_expression();

			if( db_expression && !is_empty_field(db_field_name) )
			{
				field_model.model_env->model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;

				if( db_expression->get_output_type() == MORM_OUTPUT_TYPE_SELECT_COLUMNS )
				{
					field_model_left_join(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key, db_expression);
				}

				if( db_expression->get_output_type() != MORM_OUTPUT_TYPE_JOIN_TABLES )
				{
					// they dont have to be copied out, this is the same as current table name and table_index
					std::string current_prefix = db_expression->get_column_prefix();
					int current_table_index = db_expression->get_column_prefix_index();

					///////////
					PT::TextStream join_table_name;
					field_model.table_name_for_join_as(join_table_name); // RENAME this method

					std::string sss; // improve me
					join_table_name.to_string(sss);

					// now we dont need set_column_prefix()?, we can pass ModelEnv there somewhat?
					db_expression->set_column_prefix(sss, field_model.model_env->table_index);

					field_model.map_fields();

					db_expression->set_column_prefix(current_prefix, current_table_index);
				}

				field_model.model_env->model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
			}
		}
	}


	void field_model_clear_values(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		Clearer * clearer = model_connector->get_clearer();

		if( clearer )
		{
			clearer->clear_model(field_model);
		}
	}


	void field_model_generate_doc_flat(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		FlatConnector * doc_connector = model_connector->get_doc_connector(); // different connector will be here (doc, flat)

		if( doc_connector )
		{
			FlatExpression * doc_expression = doc_connector->get_expression();

			// potrzebujemy dwa rozne doce, jeden dla flat drugi dla bazy danych
			if( doc_expression && !is_empty_field(flat_field_name) )
			{
				// insertable, updatable and is_primary_key are ignored here
				doc_expression->field_doc(*this, flat_field_name, field_model, insertable, updatable, false);
			}
		}
	}


	void field_model_read_values_from_queryresult(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		DbConnector * db_connector = model_connector->get_db_connector();

		if( db_connector )
		{
			if( !is_empty_field(db_field_name) )
			{
				// we need to test if the object is actually defined, test nulls on primary key?

				field_model.before_select();
				field_model.set_save_mode(Model::DO_UPDATE_ON_SAVE); // IMPROVE ME check if there is a primary key
				field_model.map_values_from_query();
				field_model.after_select();
			}
		}
	}


	void field_model(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model, bool insertable, bool updatable, bool has_foreign_key)
	{
		if( model_connector && model_env )
		{
			ModelEnv model_env_local(*model_env);
			field_model.model_env = &model_env_local;
			field_model.set_connector(model_connector);

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING )
			{
				field_model_generate_flat_string(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key);
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL )
			{
				field_model_generate_db_sql(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key);
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_CLEARING_VALUE )
			{
				field_model_clear_values(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key);
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DOC_FOR_FLAT )
			{
				field_model_generate_doc_flat(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key);
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_READING_VALUE_FROM_DB_RESULTSET )
			{
				field_model_read_values_from_queryresult(db_field_name, flat_field_name, field_model, insertable, updatable, has_foreign_key);
			}

			field_model.model_env = nullptr;
		}
	}


	template<typename ModelContainer, typename ModelContainerType>
	void field_list(const wchar_t * db_field_name, const wchar_t * flat_field_name, ModelContainer & field_container, ModelContainerType * model_container_type, bool insertable, bool updatable)
	{
		if( model_connector && model_env )
		{
			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING )
			{
				FlatConnector * flat_connector = model_connector->get_flat_connector();

				if( flat_connector )
				{
					FlatExpression * flat_expression = flat_connector->get_expression();

					if( flat_expression && !is_empty_field(flat_field_name) )
					{
						// IMPROVE ME
						// what about model_data and save_mode?
						// may it should be placed inside some structure?
						flat_expression->field_list(flat_field_name, field_container, insertable, updatable, false, model_connector, model_env);
					}
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					DbExpression * db_expression = db_connector->get_expression();

					if( db_expression && !is_empty_field(db_field_name) && db_expression->get_output_type() != MORM_OUTPUT_TYPE_JOIN_TABLES )
					{
						// another select will be used (from another Finder)
						// we need only columns name
						// but columns are defined in the other model
					}
				}
			}


			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_CLEARING_VALUE )
			{
				Clearer * clearer = model_connector->get_clearer();

				if( clearer )
				{
					clearer->clear_container(field_container);
				}
			}

			if( model_env->model_connector_mode == MORM_MODEL_CONNECTOR_MODE_GENERATING_DOC_FOR_FLAT )
			{
				FlatConnector * doc_connector = model_connector->get_doc_connector(); // different connector will be here (doc, flat)

				if( doc_connector )
				{
					FlatExpression * doc_expression = doc_connector->get_expression();

					// potrzebujemy dwa rozne doce, jeden dla flat drugi dla bazy danych
					if( doc_expression && !is_empty_field(flat_field_name) )
					{
						// insertable, updatable and is_primary_key are ignored here
						doc_expression->field_doc(*this, flat_field_name, field_container, insertable, updatable, false, model_env->model_data);
					}
				}
			}
		}
	}


	template<typename FieldValue>
	void get_value_by_field_index(int field_index, FieldValue & field_value)
	{
		if( model_env->cursor_helper && model_env->cursor_helper->query_result )
		{
			const char * val_str = model_env->cursor_helper->query_result->get_field_string_value(field_index);

			if( val_str )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					db_connector->get_value(val_str, field_value);
				}
			}
		}
	}


	template<typename FieldValue>
	void get_value_by_field_name(const wchar_t * field_name, FieldValue & field_value)
	{
		if( model_env->cursor_helper && model_env->cursor_helper->query_result )
		{
			const char * val_str = model_env->cursor_helper->query_result->get_field_string_value(field_name);

			if( val_str )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					db_connector->get_value(val_str, field_value);
				}
			}
		}
	}


	////
	template<typename FieldValue>
	void doc_field_generic(const wchar_t * db_field_name, const wchar_t * flat_field_name, FieldValue & field_value)
	{
		if( reinterpret_cast<const void*>(&field_value) == model_env->doc_field_pointer && model_connector )
		{
			FlatConnector * doc_connector = model_connector->get_doc_connector();

			if( doc_connector )
			{
				FlatExpression * doc_expression = doc_connector->get_expression();

				if( doc_expression )
				{
					PT::TextStream * out_stream = doc_expression->get_current_stream();

					if( out_stream )
					{
						(*out_stream) << flat_field_name;
					}
				}
			}
		}
	}


	void doc_field_model(const wchar_t * db_field_name, const wchar_t * flat_field_name, Model & field_model)
	{
		if( reinterpret_cast<const void*>(&field_model) == model_env->doc_field_pointer && model_connector )
		{
			FlatConnector * doc_connector = model_connector->get_doc_connector();

			if( doc_connector )
			{
				FlatExpression * doc_expression = doc_connector->get_expression();

				if( doc_expression )
				{
					PT::TextStream * out_stream = doc_expression->get_current_stream();

					if( out_stream )
					{
						(*out_stream) << flat_field_name;
					}
				}
			}
		}
	}


	template<typename ModelContainer>
	void doc_field_list(const wchar_t * db_field_name, const wchar_t * flat_field_name, ModelContainer & field_container)
	{
		if( reinterpret_cast<const void*>(&field_container) == model_env->doc_field_pointer && model_connector )
		{
			FlatConnector * doc_connector = model_connector->get_doc_connector();

			if( doc_connector )
			{
				FlatExpression * doc_expression = doc_connector->get_expression();

				if( doc_expression )
				{
					PT::TextStream * out_stream = doc_expression->get_current_stream();

					if( out_stream )
					{
						(*out_stream) << flat_field_name;
					}
				}
			}
		}
	}

public:


	template<typename FieldValue>
	void get_last_sequence(const wchar_t * sequence_table_name, FieldValue & field_value)
	{
		if( model_connector )
		{
			DbConnector * db_connector = model_connector->get_db_connector();

			if( db_connector && !is_empty_field(sequence_table_name) )
			{
				db_connector->get_last_sequence(sequence_table_name, field_value);
			}
		}
	}


	template<typename FieldValue>
	void add_field_for_select(const wchar_t * new_column_expression, const wchar_t * new_column_name, const wchar_t * flat_field_name, FieldValue & field_value)
	{
		if( model_connector )
		{
			if( get_connector_mode() == MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL )
			{
				DbConnector * db_connector = model_connector->get_db_connector();

				if( db_connector )
				{
					DbExpression * db_expression = db_connector->get_expression();

					if( db_expression && !is_empty_field(new_column_expression) )
					{
						db_expression->add_field_for_select(new_column_expression, new_column_name, field_value);
					}
				}
			}
			else
			if( get_connector_mode() == MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING )
			{
				field_generic(L"", flat_field_name, field_value, false, false, false);
			}
			else
			if( get_connector_mode() == MORM_MODEL_CONNECTOR_MODE_READING_VALUE_FROM_DB_RESULTSET )
			{
				field_generic(new_column_name, L"", field_value, false, false, false);
			}
			else
			if( get_connector_mode() == MORM_MODEL_CONNECTOR_MODE_CLEARING_VALUE )
			{
				field_generic(L"", L"", field_value, false, false, false); // the names don't matter here
			}
		}
	}

	template<typename FieldValue>
	void add_field_for_select(const wchar_t * new_column_expression, const wchar_t * new_column_name, FieldValue & field_value)
	{
		add_field_for_select(new_column_expression, new_column_name, new_column_name, field_value);
	}


protected:

	virtual bool is_empty_field(const wchar_t * value);

	template<typename ModelClass> friend class Finder;
	template<typename ModelClass> friend class Cursor;
	friend class BaseExpression;

};

} // namespace

#endif