/*-
 * ================================================================================
 * eCOMP Portal SDK
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property
 * ================================================================================
 * 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.openecomp.portalsdk.core.web.support;

import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import java.util.UUID;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.openecomp.portalsdk.core.FusionObject;
import org.openecomp.portalsdk.core.domain.Role;
import org.openecomp.portalsdk.core.domain.RoleFunction;
import org.openecomp.portalsdk.core.domain.UrlsAccessible;
import org.openecomp.portalsdk.core.domain.User;
import org.openecomp.portalsdk.core.exception.SessionExpiredException;
import org.openecomp.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.openecomp.portalsdk.core.menu.MenuBuilder;
import org.openecomp.portalsdk.core.restful.domain.EcompRole;
import org.openecomp.portalsdk.core.restful.domain.EcompUser;
import org.openecomp.portalsdk.core.service.DataAccessService;
import org.openecomp.portalsdk.core.util.CipherUtil;
import org.openecomp.portalsdk.core.util.SystemProperties;
import org.springframework.beans.factory.annotation.Autowired;

@SuppressWarnings("rawtypes")
public class UserUtils implements Serializable, FusionObject {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private static final String USER_ID = "UserId";
	
	static EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(UserUtils.class);
	
	public static final String KEY_USER_ROLES_CACHE = "userRoles";	

	public static final String WJ_HEADER_USER_NAME    = "iv-user";
	public static final String WJ_HEADER_USER_GROUP   = "iv-groups";
  
	private static DataAccessService dataAccessService;
	
	public static void setUserSession(HttpServletRequest request, User user, Set applicationMenuData, Set businessDirectMenuData, String loginMethod) {
		HttpSession session = request.getSession(true);
		  
		UserUtils.clearUserSession(request); // let's clear the current user session to avoid any conflicts during the set
		
	    session.setAttribute(SystemProperties.getProperty(SystemProperties.USER_ATTRIBUTE_NAME), user);

	    getRoleFunctions(request);

	    // truncate the role (and therefore the role function) data to save memory in the session
	    user.setRoles(null);
	    session.setAttribute(SystemProperties.getProperty(SystemProperties.USER_NAME),    user.getFullName());
	    session.setAttribute(SystemProperties.FIRST_NAME,    user.getFirstName());
	    session.setAttribute(SystemProperties.LAST_NAME,    user.getLastName());
	    String displayName = "";
		if (SystemProperties.getProperty(SystemProperties.APP_DISPLAY_NAME) != null)
			displayName = SystemProperties.getProperty(SystemProperties.APP_DISPLAY_NAME);
		session.setAttribute(SystemProperties.getProperty(SystemProperties.APP_DISPLAY_NAME), displayName);
	    
	    session.setAttribute(SystemProperties.getProperty(SystemProperties.APPLICATION_MENU_ATTRIBUTE_NAME),    MenuBuilder.filterMenu(applicationMenuData, request));
	    session.setAttribute(SystemProperties.getProperty(SystemProperties.BUSINESS_DIRECT_MENU_ATTRIBUTE_NAME), MenuBuilder.filterMenu(businessDirectMenuData, request));
	}
  
	public static void clearUserSession(HttpServletRequest request) {
	    HttpSession session = AppUtils.getSession(request);

	    if (session == null) {
	      throw new SessionExpiredException();
	    }

	    // removes all stored attributes from the current user's session
	    session.removeAttribute(SystemProperties.getProperty(SystemProperties.USER_ATTRIBUTE_NAME));
	    session.removeAttribute(SystemProperties.getProperty(SystemProperties.APPLICATION_MENU_ATTRIBUTE_NAME));
	    session.removeAttribute(SystemProperties.getProperty(SystemProperties.BUSINESS_DIRECT_MENU_ATTRIBUTE_NAME));
	    session.removeAttribute(SystemProperties.getProperty(SystemProperties.ROLES_ATTRIBUTE_NAME));
	    session.removeAttribute(SystemProperties.getProperty(SystemProperties.ROLE_FUNCTIONS_ATTRIBUTE_NAME));
	}
  
	@SuppressWarnings("unchecked")
	public static Set getRoleFunctions(HttpServletRequest request) {
		HashSet roleFunctions = null;

	    HttpSession session = request.getSession();
	    roleFunctions = (HashSet)session.getAttribute(SystemProperties.getProperty(SystemProperties.ROLE_FUNCTIONS_ATTRIBUTE_NAME));

	    if (roleFunctions == null) {
	        HashMap roles = getRoles(request);
	        roleFunctions = new HashSet();

	        Iterator i = roles.keySet().iterator();

	        while (i.hasNext()) {
	          Long roleKey = (Long)i.next();
	          Role    role = (Role)roles.get(roleKey);

	          Iterator j = role.getRoleFunctions().iterator();

	          while (j.hasNext()) {
	              RoleFunction function = (RoleFunction) j.next();
	              roleFunctions.add(function.getCode());
	          }
	        }

	        session.setAttribute(SystemProperties.getProperty(SystemProperties.ROLE_FUNCTIONS_ATTRIBUTE_NAME), roleFunctions);
	    }

	    return roleFunctions;
	}
  
	public static HashMap getRoles(HttpServletRequest request) {
	    HashMap roles = null;

	    //HttpSession session = request.getSession();
	    HttpSession session = AppUtils.getSession(request);
	    roles = (HashMap)session.getAttribute(SystemProperties.getProperty(SystemProperties.ROLES_ATTRIBUTE_NAME));

	    // if roles are not already cached, let's grab them from the user session
	    if (roles == null) {
	      User user = getUserSession(request);

	      // get all user roles (including the tree of child roles)
	      roles = getAllUserRoles(user);

	      session.setAttribute(SystemProperties.getProperty(SystemProperties.ROLES_ATTRIBUTE_NAME), getAllUserRoles(user));
	    }

	    return roles;
	}
  
	public static User getUserSession(HttpServletRequest request) {
	    HttpSession session = AppUtils.getSession(request);

	    if (session == null) {
	      throw new SessionExpiredException();
	    }

	    return (User)session.getAttribute(SystemProperties.getProperty(SystemProperties.USER_ATTRIBUTE_NAME));
	}
  
	@SuppressWarnings("unchecked")
	public static HashMap getAllUserRoles(User user) {
	    HashMap roles = new HashMap();
	    Iterator    i = user.getRoles().iterator();

	    while (i.hasNext()) {
	      Role role = (Role)i.next();

	      if (role.getActive()) {
	        roles.put(role.getId(), role);

	        // let's take a recursive trip down the tree to add all child roles
	        addChildRoles(role, roles);
	      }
	    }

	    return roles;
	}
  
	@SuppressWarnings("unchecked")
	private static void addChildRoles(Role role, HashMap roles) {
	    Set childRoles = role.getChildRoles();

	    if (childRoles != null && childRoles.size() > 0) {
	      Iterator j = childRoles.iterator();
	      while (j.hasNext()) {
	        Role childRole = (Role)j.next();

	        if (childRole.getActive()) {
	          roles.put(childRole.getId(), childRole);

	          addChildRoles(childRole, roles);
	        }
	      }
	    }

	}
  
	@SuppressWarnings("unchecked")
	public static boolean isUrlAccessible(HttpServletRequest request, String currentUrl) {
	    boolean isAccessible = false;
		
	    Map params = new HashMap();
	    params.put("current_url", currentUrl);

	    List list = getDataAccessService().executeNamedQuery("restrictedUrls", params, null);

	    // loop through the list of restricted URL's
	    if (list != null && list.size() > 0) {
	      for (int i=0; i < list.size(); i++) {
	    	  
	    	  UrlsAccessible urlFunctions = (UrlsAccessible) list.get(i);
	          String functionCd = (String)urlFunctions.getFunctionCd();

	        if (UserUtils.isAccessible(request, functionCd)) {
	          isAccessible = true;
	        }
	      }
	      return isAccessible;
	    }

	    return true;
	}
  
	public static boolean hasRole(HttpServletRequest request, String roleKey) {
	    return getRoles(request).keySet().contains(new Long(roleKey));
	}


	public static boolean hasRole(User user, String roleKey) {
	    return getAllUserRoles(user).keySet().contains(new Long(roleKey));
	}
  
	public static boolean isAccessible(HttpServletRequest request, String functionKey) {
	    return getRoleFunctions(request).contains(functionKey);
	}
    
	public static DataAccessService getDataAccessService() {
		return dataAccessService;
	}
  
	@Autowired
	public void setDataAccessService(DataAccessService dataAccessService) {
		UserUtils.dataAccessService = dataAccessService;
	}
  
	public static int getUserId(HttpServletRequest request) {
	    return getUserIdAsLong(request).intValue();
	}
  
	public static Long getUserIdAsLong(HttpServletRequest request) {
	    Long userId = new Long(SystemProperties.getProperty(SystemProperties.APPLICATION_USER_ID));

	    if (request != null) {
	      if (getUserSession(request) != null) {
	        userId = getUserSession(request).getId();
	      }
	    }

	    return userId;
	}
  

	private static final Object stackTraceLock = new Object();
	public static String getStackTrace(Throwable t) {
		synchronized(stackTraceLock) {
			StringWriter sw = new StringWriter ();
	        PrintWriter pw = new PrintWriter (sw);
	        t.printStackTrace (pw);
	        return sw.toString ();
		}
	}
	
	public static String getFullURL(HttpServletRequest request) {
		if (request!=null) {
			StringBuffer requestURL = request.getRequestURL();
			String queryString = request.getQueryString();

			if (queryString == null) {
				return requestURL.toString();
			} else {
				return requestURL.append('?').append(queryString).toString();
			}  
		}
		
		return "";
	}
  
	public static String getRequestId(HttpServletRequest request) {
		Enumeration<String> headerNames = request.getHeaderNames();

		String requestId = "";
		try {
			while (headerNames.hasMoreElements()) {
				String headerName = (String) headerNames.nextElement();
				logger.info(EELFLoggerDelegate.debugLogger, "One header is " + headerName + " : " + request.getHeader(headerName));
				if (headerName.equalsIgnoreCase(SystemProperties.ECOMP_REQUEST_ID)) {
					requestId = request.getHeader(headerName);
					break;
				}
			}
		} catch (Exception e) {
		  logger.error(EELFLoggerDelegate.debugLogger, "HEADER!!!! Exception : " + UserUtils.getStackTrace(e));
		}
		
		return (requestId.isEmpty() ? UUID.randomUUID().toString() : requestId);
	}
	
	
	public static EcompUser convertToEcompUser (User user){
		EcompUser userJson = new EcompUser();
		
		
		userJson.setEmail(user.getEmail());
		userJson.setFirstName(user.getFirstName());
		userJson.setHrid(user.getHrid());
		userJson.setJobTitle(user.getJobTitle());
		userJson.setLastName(user.getLastName());
		userJson.setLoginId(user.getLoginId());
		userJson.setOrgManagerUserId(user.getOrgManagerUserId());
		userJson.setMiddleInitial(user.getMiddleInitial());
		userJson.setOrgCode(user.getOrgCode());
		userJson.setOrgId(user.getOrgId());
		userJson.setPhone(user.getPhone());
		userJson.setOrgUserId(user.getOrgUserId());
		

		Set<EcompRole> ecompRoles = new TreeSet<EcompRole>();
		
		for(Role role : user.getRoles()){
			ecompRoles.add(convertToEcompRole(role));
		}
		
		userJson.setRoles(ecompRoles);
		
		return userJson;
	}
	
	public static EcompRole convertToEcompRole(Role role){
		
		EcompRole ecompRole = new EcompRole();
		ecompRole.setId(role.getId());
		ecompRole.setName(role.getName());
		
		return ecompRole;
	}
	
	public static String getUserIdFromCookie(HttpServletRequest request) throws Exception {
		String userId = "";
		Cookie[] cookies = request.getCookies();
		Cookie userIdcookie = null;
		if (cookies != null)
			for (Cookie cookie : cookies)
				if (cookie.getName().equals(USER_ID))
					userIdcookie = cookie;
		if(userIdcookie!=null){
			userId = CipherUtil.decrypt(userIdcookie.getValue(),
					SystemProperties.getProperty(SystemProperties.Decryption_Key));
		}
		return userId;
	
	}
}