/*
Wotonomy: OpenStep design patterns for pure Java applications.
Copyright (C) 2000 Blacksmith, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see http://www.gnu.org
*/
package net.wotonomy.web;

import net.wotonomy.foundation.NSArray;
import net.wotonomy.foundation.NSData;
import net.wotonomy.foundation.NSDictionary;
import net.wotonomy.foundation.NSMutableData;
import net.wotonomy.foundation.NSMutableDictionary;

/**
 * A pure java implementation of WOResponse.
 *
 * @author ezamudio@nasoft.com
 * @author $Author: cgruber $
 * @version $Revision: 905 $
 */
public class WOMessage {

	protected String _contentEncoding = "ISO8859_1";
	protected NSMutableDictionary<String, NSArray<String>> _headers = new NSMutableDictionary<>();
	protected NSMutableDictionary<String, WOCookie> _cookies = new NSMutableDictionary<>();
	private NSMutableDictionary<Object, Object> _userInfo = new NSMutableDictionary<>();
	protected NSMutableData _contentData = new NSMutableData();

	public WOMessage() {
		super();
	}

	/**
	 * Sets the content encoding for the response.
	 */
	public void setContentEncoding(String encoding) {
		_contentEncoding = encoding;
	}

	/**
	 * Gets the current content encoding for the response.
	 */
	public String contentEncoding() {
		return _contentEncoding;
	}

	/**
	 * Sets the specified array of values as headers under the specified key.
	 */
	public void setHeaders(NSArray<String> headerArray, String aKey) {
		_headers.setObjectForKey(headerArray, aKey);
	}

	/**
	 * Sets the specified header value for the specified key.
	 */
	public void setHeader(String aValue, String aKey) {
		_headers.setObjectForKey(new NSArray<>(aValue), aKey);
	}

	/**
	 * Returns an array of all the header keys that have been set in the response.
	 */
	public NSArray<String> headerKeys() {
		return _headers.allKeys();
	}

	/**
	 * Returns an array of all the header values for the specified key, or null if
	 * the key does not exist.
	 */
	public NSArray<String> headersForKey(String aKey) {
		return _headers.objectForKey(aKey);
	}

	/**
	 * Returns one header value for the specified key. Provided as a convenience,
	 * since most header keys will have a single value.
	 */
	public String headerForKey(String aKey) {
		NSArray<String> values = _headers.objectForKey(aKey);
		if (values != null && values.count() > 0) {
			return values.objectAtIndex(0).toString();
		}
		return null;
	}

	/**
	 * Sets the content of the response to the bytes represented by the specified
	 * data object.
	 */
	public void setContent(NSData aData) {
		_contentData.setData(aData);
		setHeader(Integer.toString(aData.length()), "content-length");
	}

	/**
	 * Retrieves the current content of the response.
	 */
	public NSData content() {
		return _contentData;
	}

	/**
	 * Sets the current user info dictionary. These values are for
	 * application-specific uses and are available to other actions and components
	 * in the request-response cycle.
	 */
	public void setUserInfo(NSDictionary<Object, Object> aDict) {
		_userInfo = new NSMutableDictionary<>(aDict);
	}

	/**
	 * Gets the current user info dictionary. These values are for
	 * application-specific uses are are available to other actions and components
	 * in the request-response cycle.
	 */
	public NSDictionary<Object, Object> userInfo() {
		return new NSDictionary<>(_userInfo);
	}

	/**
	 * Appends the bytes in the specified data object to the response.
	 */
	public void appendContentData(NSData aData) {
		_contentData.appendData(aData);
		setHeader(Integer.toString(_contentData.length()), "content-length");
	}

	/**
	 * Appends the specified byte to the response.
	 */
	public void appendContentCharacter(char character) {
		_contentData.appendByte((byte) character);
		setHeader(Integer.toString(_contentData.length()), "content-length");
	}

	/**
	 * Appends the specified string to the response. Any special characters will not
	 * be escaped. The string will be encoded in the current content encoding.
	 */
	public void appendContentString(String aString) {
		_contentData.appendData(new NSData(aString.getBytes()));
		setHeader(Integer.toString(_contentData.length()), "content-length");
	}

	/**
	 * Appends the specified string containing HTML to the response. Any special
	 * characters will be escaped appropriately. The string will be encoded in the
	 * current content encoding.
	 */
	public void appendContentHTMLString(String aString) {
		_contentData.appendData(new NSData(stringByEscapingHTMLString(aString).getBytes()));
		setHeader(Integer.toString(_contentData.length()), "content-length");
	}

	/**
	 * Appends the specified string containing HTML to the response. Any special
	 * characters will be escaped appropriately. This method escapes tabs and
	 * new-line characters as well. The string will be encoded in the current
	 * content encoding.
	 */
	public void appendContentHTMLAttributeValue(String aString) {
		_contentData.appendData(new NSData(stringByEscapingHTMLAttributeValue(aString).getBytes()));
		setHeader(Integer.toString(_contentData.length()), "content-length");
	}

	/**
	 * Adds the specified cookie to the response.
	 */
	public void addCookie(WOCookie aCookie) {
		_cookies.setObjectForKey(aCookie, aCookie.name());
	}

	/**
	 * Removes the specified cookie from the response.
	 */
	public void removeCookie(WOCookie aCookie) {
		_cookies.removeObjectForKey(aCookie.name());
	}

	/**
	 * Returns an array of cookies currently being sent with the response. Contains
	 * whatever cookies have previously been set in this response.
	 */
	public NSArray<WOCookie> cookies() {
		return _cookies.allValues();
	}

	/**
	 * Sets the HTTP version header in the response.
	 */
	public void setHTTPVersion(String aString) {
		setHeader(aString, "Protocol");
	}

	/**
	 * Gets the current HTTP version header for the response. Because servlet
	 * responses do not allow read access to headers, this method returns null if
	 * setHTTPVersion has not been called.
	 */
	public String httpVersion() {
		return headerForKey("Protocol");
	}

	/**
	 * Returns a sting containing the contents of the specified string after
	 * escaping all special HTML characters.
	 */
	public static String stringByEscapingHTMLString(String aString) {
		int len = aString.length();
		StringBuffer result = new StringBuffer();
		char[] buf = new char[len];
		aString.getChars(0, len, buf, 0);
		for (int i = 0; i < len; i++) {
			if (buf[i] == '&') {
				result.append("&amp;");
			} else if (buf[i] == '\\') {
				result.append("&quot;");
			} else if (buf[i] == '<') {
				result.append("&lt;");
			} else if (buf[i] == '>') {
				result.append("&gt;");
			} else {
				result.append(buf[i]);
			}
		}
		return result.toString();
	}

	/**
	 * Returns a sting containing the contents of the specified string after
	 * escaping all special HTML characters. This method escapes tabs and new-line
	 * characters as well.
	 */
	public static String stringByEscapingHTMLAttributeValue(String aString) {
		int len = aString.length();
		StringBuffer result = new StringBuffer();
		char[] buf = new char[len];
		aString.getChars(0, len, buf, 0);
		for (int i = 0; i < len; i++) {
			if (buf[i] == '&') {
				result.append("&amp;");
			} else if (buf[i] == '\\') {
				result.append("&quot;");
			} else if (buf[i] == '<') {
				result.append("&lt;");
			} else if (buf[i] == '>') {
				result.append("&gt;");
			} else if (buf[i] == '\t') {
				result.append("&#9;");
			} else if (buf[i] == '\n') {
				result.append("&#10;");
			} else if (buf[i] == '\r') {
				result.append("&#13;");
			} else {
				result.append(buf[i]);
			}
		}
		return result.toString();
	}

}