package controllers;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.SQLException;
import java.util.LinkedList;
import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class FrontController
 */
@WebServlet("/FrontController")
public class FrontController extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	// Initializes the servlet.
	public void init(ServletConfig config) throws ServletException {
		super.init(config);
		Controller.setServletContext(config.getServletContext());
	}

	// Destroys the servlet.
	public void destroy() {
	}

	/**
	 * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
	 * methods.
	 * 
	 * @param request servlet request
	 * @param response servlet response
	 */
	protected void processRequest(HttpServletRequest request,
			HttpServletResponse response) throws ServletException,
			java.io.IOException 
	{
		String[] uri;
		String action;

		Controller.setRequest(request);
		Controller.setResponse(response);

		// since everything is routed to this FC, we need to reroute the static files
		if (request.getRequestURI().replaceAll(request.getContextPath(), "").contains(".")) {
			getServletContext().getNamedDispatcher("default").forward(request, response);
			return;
		}
		
		uri = request.getRequestURI().replaceAll(request.getContextPath(), "").split("\\/");
		List<String> cleanURI = new LinkedList<String>();

		// if the uri starts or ends with a slash the split will add an
		// empty string we create a new List without any empty item
		for (String s : uri) {
			if (!s.equals("")) {
				cleanURI.add(s);
			}
		}
		
		if (cleanURI.size() == 0) {
			try {
				Home.index();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}		
		} else {
			try {
				Class<?> c = Class.forName("controllers." + cleanURI.get(0));
				
				// if the size of the list is 2 we load the specified method
				// if not we try loading the index method
				action = (cleanURI.size() == 2) ? cleanURI.get(1) : "index";
				
				Method m = c.getMethod(action, null);
				m.invoke(null, null);
			} catch (ClassNotFoundException e) {
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
			} catch (SecurityException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (NoSuchMethodException e) {
				response.sendError(HttpServletResponse.SC_NOT_FOUND);
			} catch (IllegalArgumentException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (IllegalAccessException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	/**
	 * Handles the HTTP <code>GET</code> method.
	 * 
	 * @param request
	 *            servlet request
	 * @param response
	 *            servlet response
	 */
	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException,
			java.io.IOException 
	{
		processRequest(request, response);
	}

	/**
	 * Handles the HTTP <code>POST</code> method.
	 * 
	 * @param request
	 *            servlet request
	 * @param response
	 *            servlet response
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException,
			java.io.IOException 
	{
		processRequest(request, response);
	}
}