/*
 * Copyright (C) 2012 THM webMedia
 * 
 * This file is part of ARSnova.
 *
 * ARSnova is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ARSnova 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.thm.arsnova;

import java.util.UUID;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONObject;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import de.thm.arsnova.entities.Feedback;
import de.thm.arsnova.entities.Session;
import de.thm.arsnova.entities.User;
import de.thm.arsnova.exceptions.ForbiddenException;
import de.thm.arsnova.exceptions.NotFoundException;
import de.thm.arsnova.services.ISessionService;
import de.thm.arsnova.services.IUserService;
import de.thm.arsnova.socket.ARSnovaSocketIOServer;
import de.thm.arsnova.socket.message.Question;

@Controller
public class SessionController {
	
	public static final Logger logger = LoggerFactory.getLogger(SessionController.class);
	
	@Autowired
	ISessionService sessionService;
	
	@Autowired
	IUserService userService;
	
	@Autowired
	ARSnovaSocketIOServer server;
	
	@RequestMapping(method = RequestMethod.POST, value = "/authorize")
	public void authorize(@RequestBody Object sessionObject, HttpServletResponse response) {
		String sessionkey = (String) JSONObject.fromObject(sessionObject).get("session");
		if(sessionkey == null) {
			return;
		}		
		User u = userService.getUser(SecurityContextHolder.getContext().getAuthentication());
		logger.info("authorize session: " + sessionkey + ", user is:  " + u);
		response.setStatus(u != null ? HttpStatus.CREATED.value() : HttpStatus.UNAUTHORIZED.value());
		server.authorize(UUID.fromString(sessionkey), u);
	}
	
	@RequestMapping(value="/session/{sessionkey}", method=RequestMethod.GET)
	@ResponseBody
	public Session getSession(@PathVariable String sessionkey, HttpServletResponse response) {
		try {
			Session session = sessionService.getSession(sessionkey);
			if (session != null) return session;
		} catch (NotFoundException e) {
			response.setStatus(HttpStatus.NOT_FOUND.value());
		} catch (ForbiddenException e) {
			response.setStatus(HttpStatus.FORBIDDEN.value());
		}
		return null;
	}
	
	@RequestMapping(value="/session/{sessionkey}/feedback", method=RequestMethod.GET)
	@ResponseBody
	public Feedback getFeedback(@PathVariable String sessionkey, HttpServletResponse response) {
		Feedback feedback = sessionService.getFeedback(sessionkey);
		if (feedback != null) return feedback;
		
		response.setStatus(HttpStatus.NOT_FOUND.value());
		return null;
	}
	
	@RequestMapping(value="/session/{sessionkey}/feedback", method=RequestMethod.POST)
	@ResponseBody
	public Feedback postFeedback(@PathVariable String sessionkey, @RequestBody int value, HttpServletResponse response) {
		User user = userService.getUser(SecurityContextHolder.getContext().getAuthentication());
		if (user == null) {
			response.setStatus(HttpStatus.UNAUTHORIZED.value());
			return null;
		}
		if (sessionService.saveFeedback(sessionkey, value, user)) {
			Feedback feedback = sessionService.getFeedback(sessionkey);
			if (feedback != null) {
				// TODO: Broadcast feedback changes via websocket
				response.setStatus(HttpStatus.CREATED.value());
				return feedback;
			}
			
			response.setStatus(HttpStatus.INTERNAL_SERVER_ERROR.value());
			return null;
		}
		
		response.setStatus(HttpStatus.BAD_REQUEST.value());
		return null;
	}
	
	@RequestMapping(value="/session", method=RequestMethod.POST)
	@ResponseBody
	public Session postNewSession(@RequestBody Session session, HttpServletResponse response) {
		Session newSession = sessionService.saveSession(session);
		if (session != null) {
			response.setStatus(HttpStatus.CREATED.value());
			return newSession;
		}

		response.setStatus(HttpStatus.SERVICE_UNAVAILABLE.value());
		return null;
	}

	@RequestMapping(value="/session/{sessionkey}/question/{questionId}", method=RequestMethod.GET)
	@ResponseBody
	public Question getQuestion(@PathVariable String sessionkey, @PathVariable String questionId, HttpServletResponse response) {
		Question question = sessionService.getQuestion(questionId);
		if (question != null && question.getSession().equals(sessionkey)) {
			return question;
		}
		
		response.setStatus(HttpStatus.NOT_FOUND.value());
		return null;
	}
	
	@RequestMapping(value="/session/{sessionkey}/question", method=RequestMethod.POST)
	@ResponseBody
	public void postQuestion(@PathVariable String sessionkey, @RequestBody Question question, HttpServletResponse response) {
		if (! sessionkey.equals(question.getSession())) {
			response.setStatus(HttpStatus.PRECONDITION_FAILED.value());
			return;
		}
		
		if (sessionService.saveQuestion(question)) {
			response.setStatus(HttpStatus.CREATED.value());
			return;
		}
		
		response.setStatus(HttpStatus.BAD_REQUEST.value());
		return;
	}
	
	@RequestMapping(value="/socketurl", method=RequestMethod.GET)
	@ResponseBody
	public String getSocketUrl() {
		StringBuilder url = new StringBuilder();
		
		url.append(server.isUseSSL() ? "https://" : "http://");
		url.append(server.getHostIp() + ":" + server.getPortNumber());
		
		return url.toString();
	}
}