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package org.openqa.selenium.remote;

import static org.openqa.selenium.remote.CapabilityType.HAS_TOUCHSCREEN;
import static org.openqa.selenium.remote.CapabilityType.ROTATABLE;
import static org.openqa.selenium.remote.CapabilityType.SUPPORTS_APPLICATION_CACHE;
import static org.openqa.selenium.remote.CapabilityType.SUPPORTS_FINDING_BY_CSS;
import static org.openqa.selenium.remote.CapabilityType.SUPPORTS_LOCATION_CONTEXT;
import static org.openqa.selenium.remote.CapabilityType.SUPPORTS_NETWORK_CONNECTION;
import static org.openqa.selenium.remote.CapabilityType.SUPPORTS_WEB_STORAGE;

import com.google.common.collect.Maps;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.html5.AddApplicationCache;
import org.openqa.selenium.remote.html5.AddLocationContext;
import org.openqa.selenium.remote.html5.AddWebStorage;
import org.openqa.selenium.remote.mobile.AddNetworkConnection;

import java.util.Map;

/**
 * Enhance the interfaces implemented by an instance of the
 * {@link org.openqa.selenium.remote.RemoteWebDriver} based on the returned
 * {@link org.openqa.selenium.Capabilities} of the driver.
 *
 * Note: this class is still experimental. Use at your own risk.
 */
public abstract class BaseAugmenter {
  private final Map driverAugmentors = Maps.newHashMap();
  private final Map elementAugmentors = Maps.newHashMap();

  public BaseAugmenter() {
    addDriverAugmentation(SUPPORTS_FINDING_BY_CSS, new AddFindsByCss());
    addDriverAugmentation(SUPPORTS_LOCATION_CONTEXT, new AddLocationContext());
    addDriverAugmentation(SUPPORTS_APPLICATION_CACHE, new AddApplicationCache());
    addDriverAugmentation(SUPPORTS_NETWORK_CONNECTION, new AddNetworkConnection());
    addDriverAugmentation(SUPPORTS_WEB_STORAGE, new AddWebStorage());
    addDriverAugmentation(ROTATABLE, new AddRotatable());
    addDriverAugmentation(HAS_TOUCHSCREEN, new AddRemoteTouchScreen());

    addElementAugmentation(SUPPORTS_FINDING_BY_CSS, new AddFindsChildByCss());
  }

  /**
   * Add a mapping between a capability name and the implementation of the interface that name
   * represents for instances of {@link org.openqa.selenium.WebDriver}. For example (@link
   * CapabilityType#SUPPORTS_FINDING_BY_CSS} represents the interface
   * {@link org.openqa.selenium.internal.FindsByCssSelector}, which is implemented via the
   * {@link org.openqa.selenium.remote.AddFindsByCss} provider.
   *
   * Note: This method is still experimental. Use at your own risk.
   *
   * @param capabilityName The name of the capability to model
   * @param handlerClass The provider of the interface and implementation
   */
  public void addDriverAugmentation(String capabilityName, AugmenterProvider handlerClass) {
    driverAugmentors.put(capabilityName, handlerClass);
  }

  /**
   * Add a mapping between a capability name and the implementation of the interface that name
   * represents for instances of {@link org.openqa.selenium.WebElement}. For example (@link
   * CapabilityType#SUPPORTS_FINDING_BY_CSS} represents the interface
   * {@link org.openqa.selenium.internal.FindsByCssSelector}, which is implemented via the
   * {@link AddFindsByCss} provider.
   *
   * Note: This method is still experimental. Use at your own risk.
   *
   * @param capabilityName The name of the capability to model
   * @param handlerClass The provider of the interface and implementation
   */
  public void addElementAugmentation(String capabilityName, AugmenterProvider handlerClass) {
    elementAugmentors.put(capabilityName, handlerClass);
  }


  /**
   * Enhance the interfaces implemented by this instance of WebDriver iff that instance is a
   * {@link org.openqa.selenium.remote.RemoteWebDriver}.
   *
   * The WebDriver that is returned may well be a dynamic proxy. You cannot rely on the concrete
   * implementing class to remain constant.
   *
   * @param driver The driver to enhance
   * @return A class implementing the described interfaces.
   */
  public WebDriver augment(WebDriver driver) {
    RemoteWebDriver remoteDriver = extractRemoteWebDriver(driver);
    if (remoteDriver == null) {
      return driver;
    }
    return create(remoteDriver, driverAugmentors, driver);
  }

  /**
   * Enhance the interfaces implemented by this instance of WebElement iff that instance is a
   * {@link org.openqa.selenium.remote.RemoteWebElement}.
   *
   * The WebElement that is returned may well be a dynamic proxy. You cannot rely on the concrete
   * implementing class to remain constant.
   *
   * @param element The driver to enhance.
   * @return A class implementing the described interfaces.
   */
  public WebElement augment(RemoteWebElement element) {
    // TODO(simon): We should really add a "SelfDescribing" interface for this
    RemoteWebDriver parent = (RemoteWebDriver) element.getWrappedDriver();
    if (parent == null) {
      return element;
    }

    return create(parent, elementAugmentors, element);
  }

  /**
   * Subclasses should perform the requested augmentation.
   *
   * @param              typically a RemoteWebDriver or RemoteWebElement
   * @param augmentors      augumentors to augment the object
   * @param driver          RWD instance
   * @param objectToAugment object to augment
   * @return an augmented version of objectToAugment.
   */
  protected abstract  X create(RemoteWebDriver driver, Map augmentors,
      X objectToAugment);

  /**
   * Subclasses should extract the remote webdriver or return null if it can't extract it.
   *
   * @param driver WebDriver instance to extract
   * @return extracted RemoteWebDriver or null
   */
  protected abstract RemoteWebDriver extractRemoteWebDriver(WebDriver driver);
}