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/*
 * Copyright 2016-2024 Open Text.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.github.jobservice.dbclient;

import com.github.jobservice.configuration.AppConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.sql.Connection;
import java.util.Objects;

import org.postgresql.ds.PGSimpleDataSource;

/**
 * The DatabaseHelper class is responsible for database operations.
 */
public final class DatabaseConnectionProvider
{
    private static final Logger LOG = LoggerFactory.getLogger(DatabaseConnectionProvider.class);

    private DatabaseConnectionProvider()
    {
    }

    /**
     * Creates a connection to the PostgreSQL database.
     */
    public static Connection getConnection(final AppConfig appConfig) throws Exception
    {
        final Connection conn;

        // Only JDBC/PostgreSQL connections supported.
        final String appname = appConfig.getApplicationName() != null ? appConfig.getApplicationName() : "Job Service";
        final String dbPortString = Objects.requireNonNull(appConfig.getDatabasePort());

        try{
            // Open a connection.
            final PGSimpleDataSource dbSource = new PGSimpleDataSource();
            dbSource.setServerNames(new String[]{appConfig.getDatabaseHost()});
            dbSource.setPortNumbers(new int[]{Integer.parseInt(dbPortString)});
            dbSource.setDatabaseName(appConfig.getDatabaseName());
            dbSource.setUser(appConfig.getDatabaseUsername());
            dbSource.setPassword(appConfig.getDatabasePassword());
            dbSource.setApplicationName(appname);

            LOG.debug("Connecting to database...");
            conn = dbSource.getConnection();
        } catch (final NumberFormatException ex){
            LOG.error("Invalid database port: {}", dbPortString);
            throw ex;
        }catch (final Exception ex) {
            LOG.error("Cannot get connection");
            throw ex;
        }

        return conn;
    }
}