/*
 * 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 "expression.h"
#include "model.h"


namespace morm
{

Expression::Expression()
{
	out_stream = nullptr;
	model = nullptr;
	json_escaper = nullptr;
	db_escaper = nullptr;
}

Expression::~Expression()
{
}

void Expression::set_json_escaper(BaseEscaper & json_escaper)
{
	this->json_escaper = &json_escaper;
}

void Expression::set_db_escaper(BaseEscaper & db_escaper)
{
	this->db_escaper = &db_escaper;
}



void Expression::generate_from_model()
{
	before_generate_from_model();
	model->map_fields();
	after_generate_from_model();
}


void Expression::before_generate_from_model()
{
	is_first_field = true;

	if( work_mode == MORM_WORK_MODE_MODEL_FIELDS_VALUES )
	{
		if( output_type == MORM_OUTPUT_TYPE_JSON )
		{
			(*out_stream) << "{";
		}
	}
}


void Expression::after_generate_from_model()
{
	if( work_mode == MORM_WORK_MODE_MODEL_FIELDS_VALUES )
	{
		if( output_type == MORM_OUTPUT_TYPE_JSON )
		{
			(*out_stream) << "}";
		}
	}
}


bool Expression::can_field_be_generated(bool insertable, bool updatable, bool is_primary_key)
{
	if( output_type == MORM_OUTPUT_TYPE_DB_INSERT )
	{
		return insertable;
	}
	else
	if(	output_type == MORM_OUTPUT_TYPE_DB_UPDATE )
	{
		return updatable;
	}
	else
	if( output_type == MORM_OUTPUT_TYPE_DB_PRIMARY_KEY )
	{
		return is_primary_key;
	}
	else
	{
		return true;
	}
}


void Expression::field_before()
{
	if( !is_first_field )
	{
		if( output_type == MORM_OUTPUT_TYPE_JSON )
		{
			(*out_stream) << ",";
		}
		else
		if( output_type == MORM_OUTPUT_TYPE_DB_INSERT ||
			output_type == MORM_OUTPUT_TYPE_DB_UPDATE )
		{
			(*out_stream) << ",";
		}
		else
		if( output_type == MORM_OUTPUT_TYPE_DB_PRIMARY_KEY )
		{
			(*out_stream) << " AND ";
		}
	}
}


void Expression::field_after()
{
	is_first_field = false;
}



//void Expression::field(const wchar_t * field_name, Model & field, bool insertable = true, bool updatable = true)
//{
//	// IMPLEMENT ME
//}

void Expression::put_field_name(const wchar_t * field_name)
{
	before_field_name();
	field_name_raw(field_name);
	after_field_name();
}


void Expression::before_field_name()
{
	if( output_type == MORM_OUTPUT_TYPE_JSON )
	{
		(*out_stream) << "\"";
	}
}


void Expression::after_field_name()
{
	if( output_type == MORM_OUTPUT_TYPE_JSON )
	{
		(*out_stream) << "\"";
	}
}


void Expression::before_field_value_string()
{
	if( output_type == MORM_OUTPUT_TYPE_JSON )
	{
		(*out_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_type == MORM_DB_TYPE_POSTGRESQL )
		{
			(*out_stream) << "E'";
		}
	}
}

void Expression::after_field_value_string()
{
	if( output_type == MORM_OUTPUT_TYPE_JSON )
	{
		(*out_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_type == MORM_DB_TYPE_POSTGRESQL )
		{
			(*out_stream) << "'";
		}
	}
}

void Expression::before_field_value(const std::wstring &)
{
	before_field_value_string();
}

void Expression::before_field_value(const std::string &)
{
	before_field_value_string();
}

void Expression::after_field_value(const std::wstring &)
{
	after_field_value_string();
}

void Expression::after_field_value(const std::string &)
{
	after_field_value_string();
}


void Expression::field_name_raw(const wchar_t * field_name)
{
	// IMPROVE ME
	// provide esc_field and esc_value methods
	esc(field_name, *out_stream);
}


void Expression::field_value_raw(const std::wstring & field_value)
{
	// IMPROVE ME
	// provide esc_field and esc_value methods
	esc(field_value, *out_stream);
}

void Expression::field_value_raw(long field_value)
{
	// may it should be moved to escaper?
	(*out_stream) << field_value;
}

void Expression::field_value_raw(int field_value)
{
	// may it should be moved to escaper?
	(*out_stream) << field_value;
}


void Expression::to_json(PT::TextStream & stream, Model & model)
{
	work_mode = MORM_WORK_MODE_MODEL_FIELDS_VALUES;
	output_type = MORM_OUTPUT_TYPE_JSON;
	out_stream = &stream;
	this->model = &model;

	generate_from_model();
}


void Expression::insert(PT::TextStream & stream, Model & model, int db_type)
{
	out_stream = &stream;
	output_type = MORM_OUTPUT_TYPE_DB_INSERT;
	this->db_type = db_type;
	this->model = &model;

	stream << "insert into ";
	this->model->table_name(stream);
	stream << " (";
	work_mode = MORM_WORK_MODE_MODEL_FIELDS;
	generate_from_model();
	stream << ") values (";
	work_mode = MORM_WORK_MODE_MODEL_VALUES;
	generate_from_model();
	stream << ")";
}




void Expression::update(PT::TextStream & stream, Model & model, int db_type)
{
	out_stream = &stream;
	this->db_type = db_type;
	this->model = &model;

	stream << "update ";
	this->model->table_name(stream);
	stream << " set (";
	work_mode = MORM_WORK_MODE_MODEL_FIELDS;
	output_type = MORM_OUTPUT_TYPE_DB_UPDATE;
	generate_from_model();
	stream << ") values (";
	work_mode = MORM_WORK_MODE_MODEL_VALUES;
	output_type = MORM_OUTPUT_TYPE_DB_UPDATE;
	generate_from_model();
	stream << ") where ";
	work_mode = MORM_WORK_MODE_MODEL_FIELDS_VALUES;
	output_type = MORM_OUTPUT_TYPE_DB_PRIMARY_KEY;
	generate_from_model();
}


/*
template<typename Container>
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;
}
*/



} // namespace