/*
 * 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, 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_expression
#define headerfile_morm_expression

#include "textstream/textstream.h"
#include "morm_types.h"
#include "baseescaper.h"



namespace morm
{
class Model;
class ModelConnector;


class Expression
{
public:

	Expression();
	virtual ~Expression();

	virtual void set_json_escaper(BaseEscaper & json_escaper);
	virtual void set_db_escaper(BaseEscaper & db_escaper);

	virtual void to_json(PT::TextStream & stream, Model & model);
	virtual void insert(PT::TextStream & stream, Model & model, int db_type);
	virtual void update(PT::TextStream & stream, Model & model, int db_type);


	Expression & eq(const wchar_t * field_name, const std::wstring & field_value)
	{
		//put_field_name(field_name);
		return *this;
	}

	Expression & eq(const wchar_t * field_name, const std::string & field_value)
	{

		return *this;
	}

	template<typename FieldValue>
	Expression & eq(const wchar_t * field_name, const FieldValue & field_value)
	{

		return *this;
	}

	/*
	 *
	 *
	 *
	 *
	 *
	 */


protected:


	int work_mode;   /* what to do: generating fields list, values list or fields-values list */
	int output_type; /* what the output string is: for json, for database */
	int db_type;     /* what type of database we are using if generating a string for a database */

	bool is_first_field;

	// niech Stream bedzie jakims interfejsem z operatorami << dla standardowych typow
	PT::TextStream * out_stream;
	Model * model;

	BaseEscaper * json_escaper;
	BaseEscaper * db_escaper;


/*
ostream& operator<< (bool val);
ostream& operator<< (short val);
ostream& operator<< (unsigned short val);
ostream& operator<< (int val);
ostream& operator<< (unsigned int val);
ostream& operator<< (long val);
ostream& operator<< (unsigned long val);
ostream& operator<< (long long val);
ostream& operator<< (unsigned long long val);
ostream& operator<< (float val);
ostream& operator<< (double val);
ostream& operator<< (long double val);
ostream& operator<< (void* val);
*/

//	virtual void map_fields(Model * model)
//	{
//		work_mode = model->work_mode;
//		out_stream = model->out_stream;
//		is_insert = model->is_insert;
//		is_update = model->is_update;
//
//		generate_from_model();
//	}


	virtual void generate_from_model();
	virtual void before_generate_from_model();
	virtual void after_generate_from_model();
	virtual bool can_field_be_generated(bool insertable, bool updatable, bool is_primary_key);
	virtual void field_before();
	virtual void field_after();

	template<typename FieldValue>
	void field(const wchar_t * field_name, const FieldValue & field_value, bool insertable = true, bool updatable = true, bool is_primary_key = false)
	{
		if( can_field_be_generated(insertable, updatable, is_primary_key) )
		{
			field_before();

			if( work_mode == MORM_WORK_MODE_MODEL_FIELDS )
			{
				put_field_name(field_name);
			}
			else
			if( work_mode == MORM_WORK_MODE_MODEL_VALUES )
			{
				put_field_value(field_value);
			}
			else
			if( work_mode == MORM_WORK_MODE_MODEL_FIELDS_VALUES )
			{
				print_field_name_value(field_name, field_value);
			}

			field_after();
		}
	}

	//void field(const wchar_t * field_name, Model & field, bool insertable = true, bool updatable = true);

	virtual void put_field_name(const wchar_t * field_name);

	template<typename FieldValue>
	void put_field_value(const FieldValue & field_value)
	{
		before_field_value(field_value);
		field_value_raw(field_value);
		after_field_value(field_value);
	}


	virtual void before_field_name();
	virtual void after_field_name();

	virtual void before_field_value_string();
	virtual void after_field_value_string();

	virtual void before_field_value(const std::wstring &);
	virtual void after_field_value(const std::wstring &);

	virtual void before_field_value(const std::string &);
	virtual void after_field_value(const std::string &);

	template<typename FieldValue>
	void before_field_value(const FieldValue &)
	{
	}

	template<typename FieldValue>
	void after_field_value(const FieldValue &)
	{
	}

	virtual void field_name_raw(const wchar_t * field_name);
	virtual void field_value_raw(const std::wstring & field_value);
	virtual void field_value_raw(long field_value);

	virtual void field_value_raw(int field_value);

	template<typename FieldValue>
	void print_field_name_value(const wchar_t * field_name, const FieldValue & field_value)
	{
		put_field_name(field_name);

		if( output_type == MORM_OUTPUT_TYPE_JSON )
		{
			(*out_stream) << ":";
		}
		else
		if( output_type == MORM_OUTPUT_TYPE_DB_PRIMARY_KEY )
		{
			(*out_stream) << " = ";
		}

		put_field_value(field_value);
	}


	/*
	template<typename Container>
	virtual void field_container(const wchar_t * field_name, Container container, bool insertable = true, bool updatable = true)
	{
		typename Container::value Value; // czy tu jest Container::value? sprawdzic

		if( !is_first_field )
			(*out_stream) << ",";

		if( work_mode == ORM_STREAM_MODE_CREATING_JSON )
		{
			(*out_stream) << "[";
			boolean is_first = true;

			for(Value v : container)
			{
				if( !is_first )
					(*out_stream) << ",";

				v.map_fields(this);
				is_first = false;
			}

			(*out_stream) << "]";
		}
		// a co z bazą danych?


		is_first_field = false;
	}
	*/


	template<typename Field>
	void esc(const Field & val, PT::TextStream & stream)
	{
		if( output_type == MORM_OUTPUT_TYPE_JSON )
		{
			if( json_escaper )
			{
				json_escaper->esc(val, stream);
			}
		}
		else
		if( output_type == MORM_OUTPUT_TYPE_DB_INSERT ||
			output_type == MORM_OUTPUT_TYPE_DB_UPDATE ||
			output_type == MORM_OUTPUT_TYPE_DB_PRIMARY_KEY )
		{
			if( db_escaper )
			{
				db_escaper->esc(val, stream);
			}
		}
	}


	friend ModelConnector;

};




} // namespace

#endif