// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 com.cloud.servlet;

import java.net.URLEncoder;
import java.util.List;

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

import org.apache.log4j.Logger;

import com.cloud.configuration.Configuration;
import com.cloud.configuration.dao.ConfigurationDao;
import com.cloud.server.ManagementServer;
import com.cloud.user.Account;
import com.cloud.user.AccountService;
import com.cloud.user.User;
import com.cloud.user.UserVO;
import com.cloud.user.dao.UserDao;
import com.cloud.utils.SerialVersionUID;
import com.cloud.utils.component.ComponentLocator;

public class RegisterCompleteServlet extends HttpServlet implements ServletContextListener {
	public static final Logger s_logger = Logger.getLogger(RegisterCompleteServlet.class.getName());
	
    static final long serialVersionUID = SerialVersionUID.CloudStartupServlet;
   
    protected static AccountService _accountSvc = null;
    protected static ConfigurationDao _configDao = null;
    protected static UserDao _userDao = null;
    
	@Override
    public void init() throws ServletException {
		ComponentLocator locator = ComponentLocator.getLocator(ManagementServer.Name);
		_accountSvc = locator.getManager(AccountService.class);
		_configDao = locator.getDao(ConfigurationDao.class);
		_userDao = locator.getDao(UserDao.class);
	}
	
	@Override
	public void contextInitialized(ServletContextEvent sce) {
	    try {
	        init();
	    } catch (ServletException e) {
	        s_logger.error("Exception starting management server ", e);
	        throw new RuntimeException(e);
	    }
	}
	
	@Override
	public void contextDestroyed(ServletContextEvent sce) {
	}
	
	@Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
		doGet(req, resp);
	}
	
	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) {
		String registrationToken = req.getParameter("token");
		String expires = req.getParameter("expires");
		int statusCode = HttpServletResponse.SC_OK;
		String responseMessage = null;
		
		if (registrationToken == null || registrationToken.trim().length() == 0) {
			statusCode = 503;
			responseMessage = "{ \"registration_info\" : { \"errorcode\" : \"503\", \"errortext\" : \"Missing token\" } }";
		} else {
			s_logger.info("Attempting to register user account with token = "+registrationToken);
			User resourceAdminUser = _accountSvc.getActiveUserByRegistrationToken(registrationToken);
			if (resourceAdminUser != null) {
				if(resourceAdminUser.isRegistered()) {
					statusCode = 503;
					responseMessage = "{ \"registration_info\" : { \"errorcode\" : \"503\", \"errortext\" : \"Expired token = " + registrationToken + "\" } }";
				} else {
					if(expires != null && expires.toLowerCase().equals("true")){
						_accountSvc.markUserRegistered(resourceAdminUser.getId());
					}
					
					Account resourceAdminAccount = _accountSvc.getActiveAccountById(resourceAdminUser.getAccountId());
					Account rsUserAccount = _accountSvc.getActiveAccountByName(resourceAdminAccount.getAccountName()+"-user", resourceAdminAccount.getDomainId());
					
					List<UserVO> users =  _userDao.listByAccount(rsUserAccount.getId());
					User rsUser = users.get(0);
					
					Configuration config = _configDao.findByName("endpointe.url");
					
					StringBuffer sb = new StringBuffer();
			        sb.append("{ \"registration_info\" : { \"endpoint_url\" : \""+encodeParam(config.getValue())+"\", ");
			        sb.append("\"domain_id\" : \""+resourceAdminAccount.getDomainId()+"\", ");
			        sb.append("\"admin_account\" : \""+encodeParam(resourceAdminUser.getUsername())+"\", ");
			        sb.append("\"admin_account_api_key\" : \""+resourceAdminUser.getApiKey()+"\", ");
			        sb.append("\"admin_account_secret_key\" : \""+resourceAdminUser.getSecretKey()+"\", ");
			        sb.append("\"user_account\" : \""+encodeParam(rsUser.getUsername())+"\", ");
			        sb.append("\"user_account_api_key\" : \""+rsUser.getApiKey()+"\", ");
			        sb.append("\"user_account_secret_key\" : \""+rsUser.getSecretKey()+"\" ");
			        sb.append("} }");
			        responseMessage = sb.toString();
				}
			} else {
				statusCode = 503;
				responseMessage = "{ \"registration_info\" : { \"errorcode\" : \"503\", \"errortext\" : \"Invalid token = " + registrationToken + "\" } }";
			}
		}
        
        try {
	        resp.setContentType("text/javascript; charset=UTF-8");
	        resp.setStatus(statusCode);
			resp.getWriter().print(responseMessage);
        } catch (Exception ex) {
        	s_logger.error("unknown exception writing register complete response", ex);
        }
	}
	
	private String encodeParam(String value) {
		try {
			return URLEncoder.encode(value, "UTF-8").replaceAll("\\+", "%20");
		} catch (Exception e) {
			s_logger.warn("Unable to encode: " + value);
		}
		return value;
	}
}