/*
 * Copyright 2009 NCHOVY
 * 
 * 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.krakenapps.servlet.text;

import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TextHttpServlet extends HttpServlet {
	final Logger logger = LoggerFactory.getLogger(TextHttpServlet.class.getName());
	private static final long serialVersionUID = 1L;

	private TextHttpServiceApi manager;

	public TextHttpServlet(TextHttpServiceApi manager) {
		this.manager = manager;
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setContentType("text/plain;charset=UTF-8");

		logger.debug("text servlet pathinfo: " + req.getPathInfo());
		String[] tokens = req.getPathInfo().split("/");
		if (tokens.length != 3)
			return;

		String filterId = tokens[1];
		String methodName = tokens[2];

		try {
			String text = (String) manager.invokeTextMethod(filterId, methodName, req);
			if (text == null) {
				logger.warn("text servlet null returned.");
			}
			resp.getWriter().print(text);
			resp.getWriter().close();

		} catch (NoSuchMethodException e) {
			try {
				Map<String, Object> params = buildParameterMap(req);
				String text = (String) manager.invokeTextMethod(filterId, methodName, params);
				if (text == null) {
					logger.warn("text servlet null returned.");
				}
				resp.getWriter().print(text);
				resp.getWriter().close();
			} catch (Exception e1) {
				e1.printStackTrace();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	@SuppressWarnings("unchecked")
	private Map<String, Object> buildParameterMap(HttpServletRequest req) {
		Map<String, Object> paramMap = new HashMap<String, Object>();
		Enumeration it = req.getParameterNames();
		while (it.hasMoreElements()) {
			String name = (String) it.nextElement();
			Object value = req.getParameter(name);
			paramMap.put(name, value);
		}
		return paramMap;
	}
}