/*
 * 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.
 *
 */

#include "dbconnector.h"
#include "model.h"


namespace morm
{

DbConnector::DbConnector()
{
	db_expression = nullptr;
	expression_allocated = false;
}


DbConnector::~DbConnector()
{
	deallocate_expression();
}



bool DbConnector::query(PT::TextStream & stream)
{
	return false;
}


bool DbConnector::query(const std::wstring & query)
{
	return false;
}


bool DbConnector::query(const std::string & query)
{
	return false;
}


bool DbConnector::query(const wchar_t * query)
{
	return false;
}


bool DbConnector::query(const char * query)
{
	// do query
	return false;
}




DbExpression * DbConnector::get_expression()
{
	allocate_default_expression_if_needed();
	return db_expression;
}



void DbConnector::generate_insert_query(PT::TextStream & stream, Model & model)
{
	allocate_default_expression_if_needed();

	if( db_expression )
	{
		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_UPDATE);

		stream << "insert into ";
		model.table_name(stream);
		stream << " (";
		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS);
		db_expression->generate_from_model(stream, model);

		stream << ") values (";
		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_VALUES);
		db_expression->generate_from_model(stream, model);
		stream << ")";
	}
}


void DbConnector::generate_update_query(PT::TextStream & stream, Model & model)
{
	allocate_default_expression_if_needed();

	if( db_expression )
	{
		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_UPDATE);

		stream << "update ";
		model.table_name(stream);
		stream << " set (";
		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS);
		db_expression->generate_from_model(stream, model);

		stream << ") values (";
		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_VALUES);
		db_expression->generate_from_model(stream, model);

		stream << ") where ";
		db_expression->set_work_mode(MORM_WORK_MODE_MODEL_FIELDS_VALUES);
		db_expression->set_output_type(MORM_OUTPUT_TYPE_DB_PRIMARY_KEY);
		db_expression->generate_from_model(stream, model);
	}
}



void DbConnector::insert(PT::TextStream & stream, Model & model)
{
	generate_insert_query(stream, model);
	// do the real inserting
	// query(stream);
	// and get autogenerated columns
}


void DbConnector::update(PT::TextStream & stream, Model & model)
{
	generate_update_query(stream, model);
	// do the real updating
	// query(stream);
	// and get autogenerated columns
}


void DbConnector::deallocate_expression()
{
	if( expression_allocated )
	{
		delete db_expression;
		db_expression = nullptr;
		expression_allocated = false;
	}
}



void DbConnector::allocate_default_expression_if_needed()
{
	if( !db_expression )
	{
		allocate_default_expression();
	}
}

}