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// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
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package org.openqa.selenium.remote.internal;

import com.google.common.base.Function;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;

import org.openqa.selenium.internal.WrapsElement;
import org.openqa.selenium.remote.RemoteWebElement;

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

/**
 * Converts {@link RemoteWebElement} objects, which may be
 * {@link WrapsElement wrapped}, into their JSON representation as defined by
 * the WebDriver wire protocol. This class will recursively convert Lists and
 * Maps to catch nested references.
 *
 * @see 
 *     WebDriver JSON Wire Protocol
 */
public class WebElementToJsonConverter implements Function {
  public Object apply(Object arg) {
    if (arg == null || arg instanceof String || arg instanceof Boolean ||
        arg instanceof Number) {
      return arg;
    }

    while (arg instanceof WrapsElement) {
      arg = ((WrapsElement) arg).getWrappedElement();
    }

    if (arg instanceof RemoteWebElement) {
      return ImmutableMap.of("ELEMENT", ((RemoteWebElement) arg).getId(),
                             "element-6066-11e4-a52e-4f735466cecf", ((RemoteWebElement) arg).getId());
    }

    if (arg.getClass().isArray()) {
      arg = Lists.newArrayList((Object[]) arg);
    }

    if (arg instanceof Collection) {
      Collection args = (Collection) arg;
      return Collections2.transform(args, this);
    }

    if (arg instanceof Map) {
      Map args = (Map) arg;
      Map converted = Maps.newHashMapWithExpectedSize(args.size());
      for (Map.Entry entry : args.entrySet()) {
        Object key = entry.getKey();
        if (!(key instanceof String)) {
          throw new IllegalArgumentException(
              "All keys in Map script arguments must be strings: " + key.getClass().getName());
        }
        converted.put((String) key, apply(entry.getValue()));
      }
      return converted;
    }

    throw new IllegalArgumentException("Argument is of an illegal type: " +
        arg.getClass().getName());
  }
}