package com.ashishtrivedi16.transactionscript.db;

import com.ashishtrivedi16.transactionscript.Room;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Optional;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import javax.sql.DataSource;

public class HotelDaoImpl implements HotelDao {

  private final DataSource dataSource;

  public HotelDaoImpl(DataSource dataSource) {
    this.dataSource = dataSource;
  }

  @Override
  public Stream<Room> getAll() throws Exception {
    try {
      var connection = getConnection();
      var statement = connection.prepareStatement("SELECT * FROM ROOMS");
      ResultSet resultSet = statement.executeQuery(); // NOSONAR
      return StreamSupport.stream(new Spliterators.AbstractSpliterator<Room>(Long.MAX_VALUE,
          Spliterator.ORDERED) {

        @Override
        public boolean tryAdvance(Consumer<? super Room> action) {
          try {
            if (!resultSet.next()) {
              return false;
            }
            action.accept(createRoom(resultSet));
            return true;
          } catch (SQLException e) {
            throw new RuntimeException(e); // NOSONAR
          }
        }
      }, false).onClose(() -> {
        try {
          mutedClose(connection, statement, resultSet);
        } catch (Exception e) {
          e.printStackTrace();
        }
      });
    } catch (SQLException e) {
      throw new CustomException(e.getMessage(), e);
    }
  }

  @Override
  public Optional<Room> getById(int id) throws Exception {
    ResultSet resultSet = null;

    try (var connection = getConnection();
         var statement = connection.prepareStatement("SELECT * FROM ROOMS WHERE ID = ?")) {

      statement.setInt(1, id);
      resultSet = statement.executeQuery();
      if (resultSet.next()) {
        return Optional.of(createRoom(resultSet));
      } else {
        return Optional.empty();
      }
    } catch (SQLException ex) {
      throw new CustomException(ex.getMessage(), ex);
    } finally {
      if (resultSet != null) {
        resultSet.close();
      }
    }
  }

  @Override
  public Boolean add(Room room) throws Exception {
    if (getById(room.getId()).isPresent()) {
      return false;
    }

    try (var connection = getConnection();
         var statement = connection.prepareStatement("INSERT INTO ROOMS VALUES (?,?,?,?)")) {
      statement.setInt(1, room.getId());
      statement.setString(2, room.getRoomType());
      statement.setInt(3, room.getPrice());
      statement.setBoolean(4, room.isBooked());
      statement.execute();
      return true;
    } catch (SQLException ex) {
      throw new CustomException(ex.getMessage(), ex);
    }
  }

  @Override
  public Boolean update(Room room) throws Exception {
    try (var connection = getConnection();
         var statement =
             connection
                 .prepareStatement("UPDATE ROOMS SET ROOM_TYPE = ?, PRICE = ?, BOOKED = ?"
                     + " WHERE ID = ?")) {
      statement.setString(1, room.getRoomType());
      statement.setInt(2, room.getPrice());
      statement.setBoolean(3, room.isBooked());
      statement.setInt(4, room.getId());
      return statement.executeUpdate() > 0;
    } catch (SQLException ex) {
      throw new CustomException(ex.getMessage(), ex);
    }
  }

  @Override
  public Boolean delete(Room room) throws Exception {
    try (var connection = getConnection();
         var statement = connection.prepareStatement("DELETE FROM CUSTOMERS WHERE ID = ?")) {
      statement.setInt(1, room.getId());
      return statement.executeUpdate() > 0;
    } catch (SQLException ex) {
      throw new CustomException(ex.getMessage(), ex);
    }
  }

  private Connection getConnection() throws SQLException {
    return dataSource.getConnection();
  }

  private void mutedClose(Connection connection, PreparedStatement statement, ResultSet resultSet)
      throws Exception {
    try {
      resultSet.close();
      statement.close();
      connection.close();
    } catch (SQLException e) {
      throw new CustomException(e.getMessage(), e);
    }
  }

  private Room createRoom(ResultSet resultSet) throws SQLException {
    return new Room(resultSet.getInt("ID"),
        resultSet.getString("ROOM_TYPE"),
        resultSet.getInt("PRICE"),
        resultSet.getBoolean("BOOKED"));
  }
}