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/*
Copyright 2011 Selenium committers
Copyright 2011 Software Freedom Conservancy

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 org.openqa.grid.internal;

import org.json.JSONObject;
import org.openqa.grid.common.RegistrationRequest;
import org.openqa.grid.common.exception.GridException;
import org.openqa.grid.internal.utils.CapabilityMatcher;
import org.openqa.grid.internal.utils.HtmlRenderer;
import org.openqa.selenium.remote.internal.HttpClientFactory;

import java.net.URL;
import java.util.List;
import java.util.Map;

/**
 * Proxy to a remote server executing the tests.  The proxy keeps a state of what is happening
 * on the remote server and knows if a new test can be run on the remote server. There are several
 * reasons why a test could not be run on the specified remote server, for instance: if the
 * RemoteProxy decides the remote server has reached the maximum number of concurrent sessions, or
 * if the client has requested DesiredCapabilities we don't support e.g. asking for Chrome when we
 * only support Firefox.
 */
public interface RemoteProxy extends Comparable {
  /**
   * Each test running on the node will occupy a test slot.  A test slot can either be in use (have a session) or be
   * available for scheduling (no associated session).  This method allows retrieving the total state of the node,
   * both test slots in use and those unused.
   *
   * @return the test slots.
   */
  List getTestSlots();

  /**
   * Retrieves the handle to the registry this remote proxy is registered with.
   *
   * @return the registry.
   */
  Registry getRegistry();

  /**
   * Returns the capability matcher that will be used to by the remote proxy
   * to determine whether its test slots can run a requested test session.
   *
   * @return the capability matcher.
   */
  CapabilityMatcher getCapabilityHelper();

  /**
   * If the RemoteProxy implementation also implements TimeoutListener, then this method
   * will start up the thread used to monitor timeouts and handle cleanup of timed out resources.
   */
  void setupTimeoutListener();

  /**
   * Returns the unique id for the node.  The ID should not change throughout the life of the node.
   *
   * @return the unique node id.
   */
  String getId();

  /**
   * If the RemoteProxy implementation also implements TimeoutListener, then this method
   * will stop the thread used to monitor timeouts.
   */
  void teardown();

  /**
   * Returns the configuration the node was initialized with.
   *
   * @return the node configuration.
   */
  Map getConfig();

  /**
   * Returns the request sent from the node to the hub to register the proxy.
   *
   * @return the original node registration request.
   */
  RegistrationRequest getOriginalRegistrationRequest();

  /**
   * Returns the maximum number of concurrent tests that can run on this node.  NB: this number can be less than
   * the number of test slots because a test slot only indicates what type of test session can be run on the remote.
   * I.e., a node may allow N different types of tests, but only allow M tests to run at once, for M <= N.
   *
   * @return
   */
  int getMaxNumberOfConcurrentTestSessions();

  /**
   * Get the host the node is on. This is different from the URL used to communicate with the
   * driver. For a local node that support both RC and WebDriver protocols,
   * remoteHost=http://localhost:5555, but the underlying server will respond on urls
   * http://localhost:5555/wd/hub (proxy.host + slot.path, where slot is a WebDriver slot) and
   * http://localhost:5555/selenium-server/driver (proxy.host + slot.path, where slot is an RC slot).
   *
   * @return the host the node is running on.
   */
  URL getRemoteHost();

  /**
   * Creates and returns a new test session if the current node has the resources and is ready to run the test.
   *
   * @param requestedCapability the type of test the client is interested in performing.
   *
   * @return a new TestSession if possible, null otherwise
   */
  TestSession getNewSession(Map requestedCapability);

  /**
   * Returns the total number of test slots used on this node.
   *
   * @return the total number of test slots in use.
   */
  int getTotalUsed();

  /**
   * Returns the object responsible for rendering any information about the proxy in a Web application.
   *
   * @return the renderer.
   */
  HtmlRenderer getHtmlRender();

  /**
   * Indicates how long a node should wait for a seemingly non-responsive test session before deciding it has timed out.
   *
   * @return the timeout in milliseconds.
   */
  int getTimeOut();

  /**
   * Retrieves the global factory for creating HTTP clients.
   *
   * @return The thread-safe HTTP client factory.
   */
  HttpClientFactory getHttpClientFactory();

  /**
   * Renders the status of the node as JSON.  Useful for APIs.
   *
   * @return the node status.
   *
   * @throws GridException if the node is down.
   */
  JSONObject getStatus() throws GridException;

  /**
   * Checks if the node has the capability requested.
   * 


   * The definition of "has" is defined by {@link CapabilityMatcher#matches(Map, Map)}
   * 


   * hasCapability = true doesn't mean the test cast start just now, only that the proxy will be
   * able to run a test requiring that capability at some point.
   *
   * @param requestedCapability the type of test the client is interested in performing.
   *
   * @return true if present
   */
  boolean hasCapability(Map requestedCapability);

  /**
   * Indicates whether the node has any test slots in use.  The node may still be able to accept more work even
   * if it is busy.
   *
   * @return true if the node has any test slots in use.
   */
  boolean isBusy();
  
  
  /**
   * Return how much resources are currently used on the proxy. Default implementation is runningTests / maxTests
   * on the proxy. For a proxy with more knowledge about its resources, a finer implementation can also take into 
   * account CPU usage, RAM usage etc.
   * @return the percentage of the available resource used. Can be greater than 100 if the grid is under heavy load.
   */
  float getResourceUsageInPercent();
}