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/*
Copyright (C) 2016 Loic Blot <loic.blot@unix-experience.fr>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "config.h"

#if USE_POSTGRESQL

#include "database-postgresql.h"

#ifdef _WIN32
        #ifndef WIN32_LEAN_AND_MEAN
                #define WIN32_LEAN_AND_MEAN
        #endif
        // Without this some of the network functions are not found on mingw
        #ifndef _WIN32_WINNT
                #define _WIN32_WINNT 0x0501
        #endif
        #include <windows.h>
        #include <winsock2.h>
#else
#include <netinet/in.h>
#endif

#include "log.h"
#include "exceptions.h"
#include "settings.h"
#include "content_sao.h"
#include "remoteplayer.h"

Database_PostgreSQL::Database_PostgreSQL(const std::string &connect_string) :
	m_connect_string(connect_string),
	m_conn(NULL),
	m_pgversion(0)
{
	if (m_connect_string.empty()) {
		throw SettingNotFoundException(
			"Set pgsql_connection string in world.mt to "
			"use the postgresql backend\n"
			"Notes:\n"
			"pgsql_connection has the following form: \n"
			"\tpgsql_connection = host=127.0.0.1 port=5432 user=mt_user "
			"password=mt_password dbname=minetest_world\n"
			"mt_user should have CREATE TABLE, INSERT, SELECT, UPDATE and "
			"DELETE rights on the database.\n"
			"Don't create mt_user as a SUPERUSER!");
	}
}

Database_PostgreSQL::~Database_PostgreSQL()
{
	PQfinish(m_conn);
}

void Database_PostgreSQL::connectToDatabase()
{
	m_conn = PQconnectdb(m_connect_string.c_str());

	if (PQstatus(m_conn) != CONNECTION_OK) {
		throw DatabaseException(std::string(
			"PostgreSQL database error: ") +
			PQerrorMessage(m_conn));
	}

	m_pgversion = PQserverVersion(m_conn);

	/*
	* We are using UPSERT feature from PostgreSQL 9.5
	* to have the better performance where possible.
	*/
	if (m_pgversion < 90500) {
		warningstream << "Your PostgreSQL server lacks UPSERT "
			<< "support. Use version 9.5 or better if possible."
			<< std::endl;
	}

	infostream << "PostgreSQL Database: Version " << m_pgversion
			<< " Connection made." << std::endl;

	createDatabase();
	initStatements();
}

void Database_PostgreSQL::verifyDatabase()
{
	if (PQstatus(m_conn) == CONNECTION_OK)
		return;

	PQreset(m_conn);
	ping();
}

void Database_PostgreSQL::ping()
{
	if (PQping(m_connect_string.c_str()) != PQPING_OK) {
		throw DatabaseException(std::string(
			"PostgreSQL database error: ") +
			PQerrorMessage(m_conn));
	}
}

bool Database_PostgreSQL::initialized() const
{
	return (PQstatus(m_conn) == CONNECTION_OK);
}

PGresult *Database_PostgreSQL::checkResults(PGresult *result, bool clear)
{
	ExecStatusType statusType = PQresultStatus(result);

	switch (statusType) {
	case PGRES_COMMAND_OK:
	case PGRES_TUPLES_OK:
		break;
	case PGRES_FATAL_ERROR:
	default:
		throw DatabaseException(
			std::string("PostgreSQL database error: ") +
			PQresultErrorMessage(result));
	}

	if (clear)
		PQclear(result);

	return result;
}

void Database_PostgreSQL::createTableIfNotExists(const std::string &table_name,
		const std::string &definition)
{
	std::string sql_check_table = "SELECT relname FROM pg_class WHERE relname='" +
		table_name + "';";
	PGresult *result = checkResults(PQexec(m_conn, sql_check_table.c_str()), false);

	// If table doesn't exist, create it
	if (!PQntuples(result)) {
		checkResults(PQexec(m_conn, definition.c_str()));
	}

	PQclear(result);