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/*
Copyright 2007-2010 WebDriver committers
Copyright 2007-2010 Google Inc.

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.selenium.remote.internal;

import java.util.Collection;
import java.util.Map;

import org.openqa.selenium.WebElement;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.openqa.selenium.remote.RemoteWebElement;
import org.openqa.selenium.remote.RenderedRemoteWebElement;

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

/**
 * Reconstitutes {@link WebElement}s from their JSON representation. Will
 * recursively convert Lists and Maps to catch nested references. All other
 * values pass through the converter unchanged.
 */
public class JsonToWebElementConverter implements Function {
  private final RemoteWebDriver driver;
  
  public JsonToWebElementConverter(RemoteWebDriver driver) {
    this.driver = driver;
  }
  
  public Object apply(Object result) {
    if (result instanceof Collection) {
      Collection results = (Collection) result;
      return Lists.newArrayList(Iterables.transform(results, this));
    }

    if (result instanceof Map) {
      Map resultAsMap = (Map) result;
      if (resultAsMap.containsKey("ELEMENT")) {
        RemoteWebElement element = newRemoteWebElement();
        element.setId(String.valueOf(resultAsMap.get("ELEMENT")));
        return element;
      } else {
        return Maps.transformValues(resultAsMap, this);
      }
    }

    if (result instanceof Number) {
      if (result instanceof Float || result instanceof Double) {
        return ((Number) result).doubleValue();
      }
      return ((Number) result).longValue();
    }

    return result;
  }
  
  protected RemoteWebElement newRemoteWebElement() {
    RemoteWebElement toReturn;
    if (driver.getCapabilities().isJavascriptEnabled()) {
      toReturn = new RenderedRemoteWebElement();
    } else {
      toReturn = new RemoteWebElement();
    }
    toReturn.setParent(driver);
    return toReturn;
  }
}