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/*
 * Copyright (C) Gustav Karlsson
 *
 * 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.kagkarlsson.examples.helpers;

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.function.Consumer;
import javax.sql.DataSource;

public class HsqlDatasource {

  public static DataSource initDatabase() {
    HikariConfig config = new HikariConfig();
    config.setJdbcUrl("jdbc:hsqldb:mem:schedule_testing");
    config.setUsername("sa");
    config.setPassword("");

    HikariDataSource dataSource = new HikariDataSource(config);

    doWithConnection(
        dataSource,
        c -> {
          try (Statement statement = c.createStatement()) {
            String createTables = readFile("/hsql_tables.sql");
            statement.execute(createTables);
          } catch (Exception e) {
            throw new RuntimeException("Failed to create tables", e);
          }
        });

    return dataSource;
  }

  private static String readFile(String resource) throws IOException {
    try (BufferedReader in =
        new BufferedReader(
            new InputStreamReader(HsqlDatasource.class.getResourceAsStream(resource)))) {
      String line;
      StringBuilder createTables = new StringBuilder();
      while ((line = in.readLine()) != null) {
        createTables.append(line);
      }
      return createTables.toString();
    }
  }

  private static void doWithConnection(DataSource dataSource, Consumer consumer) {
    try (Connection connection = dataSource.getConnection()) {
      consumer.accept(connection);
    } catch (SQLException e) {
      throw new RuntimeException("Error getting connection from datasource.", e);
    }
  }
}