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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. 
 */
package fr.hhdev.ocelot.web;

import fr.hhdev.ocelot.Constants;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Writer;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Servlet to serve ocelot.js
 *
 * @author hhfrancois
 */
@WebServlet(urlPatterns = {Constants.SLASH_OCELOT_JS})
public class JSServlet extends HttpServlet {
	
	private static final long serialVersionUID = 1973549844535787671L;

	private final static Logger logger = LoggerFactory.getLogger(JSServlet.class);

	/**
	 * Processes requests for both HTTP GET and POST methods.
	 *
	 * @param request servlet request
	 * @param response servlet response
	 * @throws ServletException if a servlet-specific error occurs
	 * @throws IOException if an I/O error occurs
	 */
	protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		response.setContentType(Constants.JSTYPE);
		String minify = request.getParameter(Constants.MINIFY_PARAMETER);
		String filename = request.getServletContext().getInitParameter(Constants.OCELOT_MIN);
		if (Constants.FALSE.equalsIgnoreCase(minify)) {
			filename = request.getServletContext().getInitParameter(Constants.OCELOT);
		}
		long lg = new File(filename).length();
		logger.debug("Get resource {}({})", filename, lg);
		response.setContentLength((int) lg);
		try (Writer out = response.getWriter()) {
			try (BufferedReader in = new BufferedReader(new FileReader(filename))) {
				String inputLine;
				while ((inputLine = in.readLine()) != null) {
					out.write(inputLine);
					out.write(Constants.BACKSLASH_N);
				}
			}
		}
	}

	// 
	/**
	 * Handles the HTTP GET method.
	 *
	 * @param request servlet request
	 * @param response servlet response
	 * @throws ServletException if a servlet-specific error occurs
	 * @throws IOException if an I/O error occurs
	 */
	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			  throws ServletException, IOException {
		processRequest(request, response);
	}

	/**
	 * Handles the HTTP POST method.
	 *
	 * @param request servlet request
	 * @param response servlet response
	 * @throws ServletException if a servlet-specific error occurs
	 * @throws IOException if an I/O error occurs
	 */
	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			  throws ServletException, IOException {
		processRequest(request, response);
	}

	/**
	 * Returns a short description of the servlet.
	 *
	 * @return a String containing servlet description
	 */
	@Override
	public String getServletInfo() {
		return "Short description";
	}// 

}