/*
 * 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_dbconnector
#define headerfile_morm_dbconnector

#include "textstream/textstream.h"
#include "log/log.h"
#include "queryresult.h"


namespace morm
{
class Model;
class DbExpression;

class DbConnector
{

public:

	DbConnector();
	DbConnector(const DbConnector &);
	virtual ~DbConnector();

	virtual void set_logger(PT::Log * log);
	virtual void set_logger(PT::Log & log);

	virtual void set_log_queries(bool log_queries);

	DbExpression * get_expression();

	//virtual void clear_last_query_result();

	virtual void generate_select_columns(PT::TextStream & stream, Model & model);
	virtual void generate_insert_query(PT::TextStream & stream, Model & model);
	virtual void generate_update_query(PT::TextStream & stream, Model & model);
	virtual void generate_remove_query(PT::TextStream & stream, Model & model);

	virtual bool insert(PT::TextStream & stream, Model & model);
	virtual bool update(PT::TextStream & stream, Model & model);
	virtual bool remove(PT::TextStream & stream, Model & model);

	//void ModelConnector::get_values_from_db(Model & model)

	virtual QueryResult * create_query_result() = 0;

	virtual bool query(const PT::TextStream & stream, QueryResult & query_result);
	virtual bool query(const std::string & query_str, QueryResult & query_result);
	virtual bool query(const char * query_str, QueryResult & query_result);

	virtual bool query_select(const char * query_str, QueryResult & query_result);
	virtual bool query_update(const char * query_str, QueryResult & query_result);
	virtual bool query_insert(const char * query_str, QueryResult & query_result);
	virtual bool query_remove(const char * query_str, QueryResult & query_result);

	virtual bool query_select(const PT::TextStream & stream, QueryResult & query_result);
	virtual bool query_update(const PT::TextStream & stream, QueryResult & query_result);
	virtual bool query_insert(const PT::TextStream & stream, QueryResult & query_result);
	virtual bool query_remove(const PT::TextStream & stream, QueryResult & query_result);

	virtual void get_value(const char * value_str, char & field_value);
	virtual void get_value(const char * value_str, unsigned char & field_value);
	virtual void get_value(const char * value_str, std::wstring & field_value);
	virtual void get_value(const char * value_str, std::string & field_value);
	virtual void get_value(const char * value_str, bool & field_value);
	virtual void get_value(const char * value_str, short & field_value);
	virtual void get_value(const char * value_str, unsigned short & field_value);
	virtual void get_value(const char * value_str, int & field_value);
	virtual void get_value(const char * value_str, unsigned int & field_value);
	virtual void get_value(const char * value_str, long & field_value);
	virtual void get_value(const char * value_str, unsigned long & field_value);
	virtual void get_value(const char * value_str, long long & field_value);
	virtual void get_value(const char * value_str, unsigned long long & field_value);
	virtual void get_value(const char * value_str, float & field_value);
	virtual void get_value(const char * value_str, double & field_value);
	virtual void get_value(const char * value_str, long double & field_value);
	virtual void get_value(const char * value_str, PT::Date & field_value);


	template<typename FieldValue>
	bool get_last_sequence(const wchar_t * sequence_table_name, FieldValue & field_value)
	{
		const char * val_str = query_last_sequence(sequence_table_name);

		if( val_str )
		{
			get_value(val_str, field_value);

			if( log && log_queries )
			{
				(*log) << PT::Log::log3 << "Morm: sequence value: " << field_value << PT::Log::logend;
			}

			return true;
		}

		return false;
	}


protected:

	DbExpression * db_expression;
	bool expression_allocated;
	PT::Log * log;
	bool log_queries;


	virtual void allocate_default_expression() = 0;
	virtual void allocate_default_expression_if_needed();
	virtual void deallocate_expression();

	virtual const char * query_last_sequence(const wchar_t * sequence_table_name);



};





}

#endif