/*
 * 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 "modelconnector.h"
#include "model.h"
#include "flatconnector.h"
#include "dbconnector.h"


namespace morm
{

ModelConnector::ModelConnector()
{
	model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	flat_connector = nullptr;
	db_connector = nullptr;


	//expression_callback = nullptr;
	//db_connector_callback = nullptr;

	out_stream = nullptr;
	out_stream_allocated = false;
}

ModelConnector::~ModelConnector()
{
	deallocate_stream();
}




void ModelConnector::set_db_expression_output_type(int output_type)
{
	if( db_connector )
	{
		DbExpression * db_expression = db_connector->get_expression();

		if( db_expression )
		{
			db_expression->set_output_type(output_type);
		}
	}
}



int ModelConnector::get_connector_mode()
{
	return model_connector_mode;
}


void ModelConnector::deallocate_stream()
{
	if( out_stream_allocated )
	{
		delete out_stream;
		out_stream = nullptr;
		out_stream_allocated = false;
	}
}


void ModelConnector::allocate_default_stream()
{
	deallocate_stream();
	out_stream = new PT::TextStream();
	out_stream_allocated = true;
}


void ModelConnector::allocate_default_stream_if_needed()
{
	if( !out_stream )
	{
		allocate_default_stream();
	}
}



void ModelConnector::set_stream(PT::TextStream & stream)
{
	deallocate_stream();
	this->out_stream = &stream;
}


PT::TextStream * ModelConnector::get_stream()
{
	allocate_default_stream_if_needed();
	return out_stream;
}



void ModelConnector::set_flat_connector(FlatConnector & flat_connector)
{
	this->flat_connector = &flat_connector;
}


void ModelConnector::set_db_connector(DbConnector & db_connector)
{
	this->db_connector = &db_connector;
}


DbConnector * ModelConnector::get_db_connector()
{
	return db_connector;
}


bool ModelConnector::was_db_error()
{
	if( db_connector )
	{
		return db_connector->was_error_in_last_query();
	}

	return false;
}


std::wstring ModelConnector::get_db_error()
{
	if( db_connector )
	{
		return db_connector->get_last_query_error_msg();
	}

	return std::wstring();
}




void ModelConnector::to_text(PT::TextStream & stream, Model & model)
{
	if( flat_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_FLAT_STRING;
		//expression_callback = flat_connector->get_expression();

		//if( expression_callback )
		//{
			flat_connector->to_text(stream, model);
		//}

		//expression_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}


void ModelConnector::generate_select_columns(PT::TextStream & stream, Model & model)
{
	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//expression_callback = db_connector->get_expression();

		//if( expression_callback )
		//{
			db_connector->generate_select_columns(stream, model);
		//}

		//expression_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}



void ModelConnector::generate_insert_query(PT::TextStream & stream, Model & model)
{
	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//expression_callback = db_connector->get_expression();

		//if( expression_callback )
		//{
			db_connector->generate_insert_query(stream, model);
		//}

		//expression_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}


void ModelConnector::generate_update_query(PT::TextStream & stream, Model & model)
{
	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//expression_callback = db_connector->get_expression();

		//if( expression_callback )
		//{
			db_connector->generate_update_query(stream, model);
		//}

		//expression_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}


void ModelConnector::generate_remove_query(PT::TextStream & stream, Model & model)
{
	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		db_connector->generate_remove_query(stream, model);
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}





bool ModelConnector::insert(Model & model)
{
	bool result = false;
	allocate_default_stream_if_needed();

	if( db_connector && out_stream )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//db_connector_callback = db_connector;

		model.before_insert();
		out_stream->clear();
		result = db_connector->insert(*out_stream, model);

		if( result )
			model.after_insert();
		else
			model.after_insert_failure();

		//db_connector_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}

	return result;
}


bool ModelConnector::update(Model & model)
{
	bool result = false;
	allocate_default_stream_if_needed();

	if( db_connector && out_stream )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//db_connector_callback = db_connector;

		model.before_update();
		out_stream->clear();
		result = db_connector->update(*out_stream, model);

		if( result )
			model.after_update();
		else
			model.after_update_failure();

		//db_connector_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}

	return result;
}




bool ModelConnector::remove(Model & model)
{
	bool result = false;
	allocate_default_stream_if_needed();

	if( db_connector && out_stream )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_GENERATING_DB_SQL;
		//db_connector_callback = db_connector;

		model.before_remove();
		out_stream->clear();
		result = db_connector->remove(*out_stream, model);

		if( result )
			model.after_remove();
		else
			model.after_remove_failure();

		//db_connector_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}

	return result;
}


void ModelConnector::map_values_from_query(Model & model)
{
	// CHECK ME
	// may we should set model.model_connector() to this?
	// the same in other methods which get a model parameter

	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_READING_VALUE_FROM_DB_RESULTSET;
		//db_connector_callback = db_connector;
		model.map_fields();
		//db_connector_callback = nullptr;
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}
}


void ModelConnector::clear_values(Model & model)
{
	if( db_connector )
	{
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_CLEARING_VALUE;
		model.map_fields();
		model_connector_mode = MORM_MODEL_CONNECTOR_MODE_NONE;
	}

}

bool ModelConnector::is_empty_field(const wchar_t * value)
{
	return (!value || *value == '\0');
}

}