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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.wicket.request.http;

import java.nio.charset.Charset;
import java.util.List;
import java.util.Locale;

import javax.servlet.http.Cookie;

import org.apache.wicket.request.IRequestParameters;
import org.apache.wicket.request.Request;
import org.apache.wicket.request.Url;
import org.apache.wicket.util.string.StringValueConversionException;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.util.time.Time;

/**
 * Base class for request that provides additional web-related information.
 * 
 * @author Matej Knopp
 * @author Igor Vaynberg
 */
public abstract class WebRequest extends Request
{
	/** marker for Ajax requests */
	public static final String PARAM_AJAX = "wicket-ajax";
	/** marker for Ajax requests */
	public static final String HEADER_AJAX = "Wicket-Ajax";
	/** marker for Ajax-relative url */
	public static final String PARAM_AJAX_BASE_URL = "wicket-ajax-baseurl";
	/** marker for Ajax-relative url */
	public static final String HEADER_AJAX_BASE_URL = "Wicket-Ajax-BaseURL";
	/** anti-cache query parameter added by Wicket.Ajax.Request at its URL */
	public static final String PARAM_AJAX_REQUEST_ANTI_CACHE = "_";

	/**
	 * @return request cookies
	 */
	public abstract List getCookies();

	/**
	 * @param cookieName
	 * @return cookie with specified name or null if the cookie does not exist
	 */
	public Cookie getCookie(final String cookieName)
	{
		for (Cookie cookie : getCookies())
		{
			if (cookie.getName().equals(cookieName))
			{
				return cookie;
			}
		}
		return null;
	}

	/**
	 * Returns all the values of the specified request header.
	 * 
	 * @param name
	 * @return unmodifiable list of header values
	 */
	public abstract List getHeaders(String name);

	/**
	 * Returns the value of the specified request header as a String
	 * 
	 * @param name
	 * @return string value of request header
	 */
	public abstract String getHeader(String name);

	/**
	 * Returns the value of the specified request header as a long value that
	 * represents a Date object. Use this method with headers that contain dates, such
	 * as If-Modified-Since.
	 * 
	 * @param name
	 * @return date value of request header or null if not found
	 */
	public abstract Time getDateHeader(String name);

	/**
	 * Convenience method for retrieving If-Modified-Since header.
	 * 
	 * @return date representing the header or null if not set
	 */
	public final Time getIfModifiedSinceHeader()
	{
		return getDateHeader("If-Modified-Since");
	}


	/**
	 * Returns whether this request is an Ajax request. This implementation checks for values of
	 * {@value #PARAM_AJAX} url parameter or the {@value #HEADER_AJAX} header. Subclasses can use
	 * other approaches.
	 * 
	 * @return true if this request is an ajax request, false otherwise.
	 */
	public boolean isAjax()
	{
		try {
			return Strings.isTrue(getHeader(HEADER_AJAX)) ||
				Strings.isTrue(getQueryParameters().getParameterValue(PARAM_AJAX).toString());
		} catch (StringValueConversionException invalidValue) {
			return false;
		}
	}

	/**
	 * Signals whether or not request processing should preserve the current client url - in other
	 * words, handle this request without redirecting. By default, this method returns {@code false}
	 * .
	 * 
	 * For example, this method can be used to preserve the url that caused a 404 in the browser if
	 * Wicket is also responsible for rendering the 404 page. If this method returns the default
	 * value of {@code false} then Wicket will redirect to the bookmarkable url of the error page,
	 * instead of preserving the url that caused the 404 in the browser.
	 * 
	 * @return {@code true} if current client url should be preserved
	 */
	public boolean shouldPreserveClientUrl()
	{
		return false;
	}

	/**
	 * Returns request with specified URL and same POST parameters as this request.
	 * 
	 * @param url
	 *            Url instance
	 * @return request with specified URL.
	 */
	@Override
	public WebRequest cloneWithUrl(final Url url)
	{
		return new WebRequest()
		{
			@Override
			public Url getUrl()
			{
				return url;
			}

			@Override
			public Url getOriginalUrl()
			{
				return WebRequest.this.getOriginalUrl();
			}

			@Override
			public IRequestParameters getPostParameters()
			{
				return WebRequest.this.getPostParameters();
			}

			@Override
			public List getCookies()
			{
				return WebRequest.this.getCookies();
			}

			@Override
			public Time getDateHeader(final String name)
			{
				return WebRequest.this.getDateHeader(name);
			}

			@Override
			public Locale getLocale()
			{
				return WebRequest.this.getLocale();
			}

			@Override
			public String getHeader(final String name)
			{
				return WebRequest.this.getHeader(name);
			}

			@Override
			public List getHeaders(final String name)
			{
				return WebRequest.this.getHeaders(name);
			}

			@Override
			public Charset getCharset()
			{
				return WebRequest.this.getCharset();
			}

			@Override
			public Url getClientUrl()
			{
				return WebRequest.this.getClientUrl();
			}

			@Override
			public Object getContainerRequest()
			{
				return WebRequest.this.getContainerRequest();
			}

			@Override
			public boolean shouldPreserveClientUrl()
			{
				return WebRequest.this.shouldPreserveClientUrl();
			}
		};
	}

}