/*************************************************************************
 *
 *  Copyright (c) 2023 Fabian Posch
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version 2
 *  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 General Public License for more details.
 *
 *  You should have received a copy of the GNU 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 <iostream>
#include <sstream>
#include "util.h"
#include "cli_util.hpp"


void get_db_cred_env (db::db_credentials_t& db_cred) {

    // check if a server was given
    if (!db_cred.server_override) {
        if (std::getenv(SERVER_ADDR_ENV) == nullptr) {
            throw std::invalid_argument("No database server set in environment variable " SERVER_ADDR_ENV);
        }

        db_cred.server = std::getenv(SERVER_ADDR_ENV);
        db_cred.server_override = false;
    }

    // check if a port was given
    if (!db_cred.port_override) {
        // if no env variable is set, we use postgresql's default port
        if (std::getenv(SERVER_PORT_ENV) == nullptr) {
            std::cerr << "Warning: No port given in environment variable " SERVER_PORT_ENV ". Using default Postgresql port." << std::endl;
            db_cred.port = POSTGRES_DEFAULT_PORT;
            db_cred.port_override = false;

        // otherwise we try to parse it from the environment variable
        } else {
        
            std::string port_st = std::getenv(SERVER_PORT_ENV);

            DEBUG_PRINT("Parsing port " + port_st);

            try {
                db_cred.port = std::atoi(port_st.c_str());
            } catch (std::invalid_argument& e) {
                throw std::invalid_argument("Could not parse port from environment variable " SERVER_PORT_ENV);
            }

            // make sure the port is valid
            if (db_cred.port <= 0) {
                throw std::invalid_argument("Port " SERVER_PORT_ENV " given in environment variable is not a valid port.");
            }

            db_cred.port_override = false;
        }
    }

    // check if a user was given
    if (!db_cred.uname_override) {
        if (std::getenv(SERVER_USER_ENV) == nullptr) {
            throw std::invalid_argument("No database user set in environment variable " SERVER_USER_ENV);
        }
        db_cred.uname = std::getenv(SERVER_USER_ENV);
        db_cred.uname_override = false;
    }

    // check if a password was given
    if (!db_cred.pwd_override) {
        if (std::getenv(SERVER_PWD_ENV) == nullptr) {
            throw std::invalid_argument("No database password set in environment variable " SERVER_PWD_ENV);
        }
        db_cred.pwd = std::getenv(SERVER_PWD_ENV);
        db_cred.pwd_override = false;
    }

    // check if a database was given
    if (!db_cred.dbase_override) {
        if (std::getenv(SERVER_DBASE_ENV) == nullptr) {
            throw std::invalid_argument("No database set in environment variable " SERVER_DBASE_ENV);
        }
        db_cred.dbase = std::getenv(SERVER_DBASE_ENV);
        db_cred.dbase_override = false;
    }
}