/**
 * Tigase HTTP API component - Tigase HTTP API component
 * Copyright (C) 2013 Tigase, Inc. (office@tigase.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, version 3 of the License.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. Look for COPYING file in the top folder.
 * If not, see http://www.gnu.org/licenses/.
 */
package rest.stream

import tigase.http.rest.Service
import tigase.server.Packet
import tigase.xml.DomBuilderHandler
import tigase.xml.Element
import tigase.xml.SimpleParser
import tigase.xml.SingletonFactory

import javax.servlet.http.HttpServletRequest
import javax.servlet.http.HttpServletResponse

/**
 * Class implements ability to send packets to any JID using REST API
 *
 * @author andrzej
 */
class Stream
		extends tigase.http.rest.Handler {

	public Stream() {
		description = [ regex: "/{to_jid}",
						POST : [ info       : 'Send XMPP stanza',
								 description: """Sends passed HTTP content as XMPP stanza.
If {to_jid} parameter is part of url then value of this parameter is used as destination address of XMPP stanza.\n\

Example of content for sending a message:
*code*<message to="user1@example.com" from="user2@example.com">
<body>Example message</body>
</message>*/code*
""" ] ]
		regex = /\/(.*)/
		isAsync = true
		decodeContent = false
		requiredRole = "admin"

		execPost = { Service service, callback, user, HttpServletRequest request, to ->
			char[] data = request.getReader().getText()?.toCharArray();
			if (data == null || data.length == 0) {
				callback({ req, HttpServletResponse resp ->
					resp.sendError(HttpServletResponse.SC_BAD_REQUEST, "No data received");
				})
				return;
			}

			SimpleParser parser = SingletonFactory.getParserInstance();
			DomBuilderHandler domHandler = new DomBuilderHandler();
			parser.parse(domHandler, data, 0, data.length);
			Element packetEl = domHandler.getParsedElements().poll();
			if (packetEl == null) {
				callback({ req, HttpServletResponse resp ->
					resp.sendError(HttpServletResponse.SC_BAD_REQUEST, "Missing XML element in content");
				})
				return;
			}

			if (to != null) {
				to = to.trim();
				if (!to.isEmpty()) {
					packetEl.setAttribute("to", to);
				}
			}

			Packet packet = Packet.packetInstance(packetEl);
			def responseHandler = (packet.getElemName() == "iq" && packet.getAttribute("from") == null) ? {
				Packet result ->
					callback({ req, HttpServletResponse resp ->
						def outBytes = result.getElement().toString().getBytes();
						resp.setContentType("application/xml");
						resp.setContentLength(outBytes.length);
						resp.getOutputStream().write(outBytes);
					});
			} : null;

			service.sendPacket(packet, null, responseHandler);

			if (responseHandler == null) {
				callback("");
			}
		}
	}
}

