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//   http://www.apache.org/licenses/LICENSE-2.0
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package org.openqa.selenium.remote.service;

import com.google.common.base.Throwables;

import org.openqa.selenium.WebDriverException;
import org.openqa.selenium.remote.Command;
import org.openqa.selenium.remote.CommandInfo;
import org.openqa.selenium.remote.DriverCommand;
import org.openqa.selenium.remote.HttpCommandExecutor;
import org.openqa.selenium.remote.Response;

import java.io.IOException;
import java.net.ConnectException;
import java.util.Map;

/**
 * A specialized {@link HttpCommandExecutor} that will use a {@link DriverService} that lives
 * and dies with a single WebDriver session. The service will be restarted upon each new session
 * request and shutdown after each quit command.
 */
public class DriverCommandExecutor extends HttpCommandExecutor {

  private final DriverService service;

  /**
   * Creates a new DriverCommandExecutor which will communicate with the driver as configured
   * by the given {@code service}.
   *
   * @param service The DriverService to send commands to.
   */
  public DriverCommandExecutor(DriverService service) {
    super(service.getUrl());
    this.service = service;
  }

  /**
   * Creates an {@link DriverCommandExecutor} that supports non-standard
   * {@code additionalCommands} in addition to the standard.
   *
   * @param service driver server
   * @param additionalCommands additional commands the remote end can process
   */
  protected DriverCommandExecutor(
      DriverService service, Map additionalCommands) {
    super(additionalCommands, service.getUrl());
    this.service = service;
  }

  /**
   * Sends the {@code command} to the driver server for execution. The server will be started
   * if requesting a new session. Likewise, if terminating a session, the server will be shutdown
   * once a response is received.
   *
   * @param command The command to execute.
   * @return The command response.
   * @throws IOException If an I/O error occurs while sending the command.
   */
  @Override
  public Response execute(Command command) throws IOException {
    if (DriverCommand.NEW_SESSION.equals(command.getName())) {
      service.start();
    }

    try {
      return super.execute(command);
    } catch (Throwable t) {
      Throwable rootCause = Throwables.getRootCause(t);
      if (rootCause instanceof ConnectException &&
          "Connection refused".equals(rootCause.getMessage()) &&
          !service.isRunning()) {
        throw new WebDriverException("The driver server has unexpectedly died!", t);
      }
      Throwables.propagateIfPossible(t);
      throw new WebDriverException(t);
    } finally {
      if (DriverCommand.QUIT.equals(command.getName())) {
        service.stop();
      }
    }
  }
}