/*-
 * ================================================================================
 * eCOMP Portal
 * ================================================================================
 * 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.portalapp.portal.utils;


import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.openecomp.portalapp.portal.domain.EPUser;
import org.openecomp.portalapp.portal.logging.format.EPAppMessagesEnum;
import org.openecomp.portalapp.portal.logging.logic.EPLogUtil;
import org.openecomp.portalsdk.core.logging.logic.EELFLoggerDelegate;
import org.openecomp.portalsdk.core.util.SystemProperties;
import org.slf4j.MDC;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class EcompPortalUtils {
	private static EELFLoggerDelegate logger = EELFLoggerDelegate.getLogger(EcompPortalUtils.class);

	/**
	 * @param orgUserId
	 * @return true if orgUserId is not empty and contains only alphanumeric, false otherwise
	 */
	public static boolean legitimateUserId(String orgUserId) {
		return orgUserId.matches("^[a-zA-Z0-9]+$");
	}

	public static List<String> parsingByRegularExpression(String source, String regex) {
		List<String> tokens = new ArrayList<String>();
		if (source != null && source.length() > 0) {
			String[] parsed = source.split(regex);
			for (String token : parsed) {
				if (token.length() > 0) {
					tokens.add(token);
				}
			}
		}
		return tokens;
	}

	public static String jsonErrorMessageResponse(int errorCode, String errorMessage) {
		return "{\"error\":{\"code\":" + errorCode + "," + "\"message\":\"" + errorMessage + "\"}}";
	}

	public static String jsonMessageResponse(String message) {
		return String.format("{\"message\":\"%s\"}", message);
	}

	public static void logAndSerializeObject(String source, String msg, Object obj) {
		try {
			String objectAsJson = new ObjectMapper().writeValueAsString(obj);
			logger.debug(EELFLoggerDelegate.debugLogger, String.format("source= [%s]; %s [%s];", source, msg, objectAsJson));
		} catch (JsonProcessingException e) {
			logger.warn(EELFLoggerDelegate.errorLogger, "JsonProcessingException occurred while parsing the response, Details:" + EcompPortalUtils.getStackTrace(e));
			EPLogUtil.logEcompError(EPAppMessagesEnum.BeInvalidJsonInput);
		} catch(Exception e) {
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred while parsing the response, Details:" + EcompPortalUtils.getStackTrace(e));
			EPLogUtil.logEcompError(EPAppMessagesEnum.BeInvalidJsonInput);
		}
	}

	public static void rollbackTransaction(Transaction transaction, String errorMessage) {
		logger.error(EELFLoggerDelegate.errorLogger, errorMessage);
		try {
			if(transaction != null) {
				transaction.rollback();
			}
		} catch (Exception e) {
			EPLogUtil.logEcompError(EPAppMessagesEnum.BeExecuteRollbackError);
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred while performing a rollback transaction, Details: " + EcompPortalUtils.getStackTrace(e));
		}
	}
	
	public static void closeLocalSession(Session localSession, String errorMessage) {
		logger.error(EELFLoggerDelegate.errorLogger, errorMessage);
		try {
			if(localSession != null) {
				localSession.close();
			}
		} catch (Exception e) {
			EPLogUtil.logEcompError(EPAppMessagesEnum.BeDaoCloseSessionError);
			logger.error(EELFLoggerDelegate.errorLogger, errorMessage + ", closeLocalSession exception: " + EcompPortalUtils.getStackTrace(e));
		}
	}

	// TODO: GLOBAL_LOGIN_URL is the same as in SessionTimeoutInterceptor.
	// It should be defined in SystemProperties.
	private static final String GLOBAL_LOGIN_URL = "global-login-url";

	/**
	 * Set response status to Unauthorized if user == null and to Forbidden in all (!) other cases.
	 * Logging is not performed if invocator == null
	 * @param user
	 * @param response
	 * @param invocator - may be null
	 */
	public static void setBadPermissions(EPUser user, HttpServletResponse response, String invocator) {
		if (user == null) {
			String loginUrl = SystemProperties.getProperty(EPSystemProperties.LOGIN_URL_NO_RET_VAL);
			response.setHeader(GLOBAL_LOGIN_URL, loginUrl);
			response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
			MDC.put(EPSystemProperties.RESPONSE_CODE, Integer.toString(HttpServletResponse.SC_UNAUTHORIZED));
		} else {
			response.setStatus(HttpServletResponse.SC_FORBIDDEN);
			MDC.put(EPSystemProperties.RESPONSE_CODE, Integer.toString(HttpServletResponse.SC_FORBIDDEN));
		}
		if (invocator != null) {
			logger.warn(EELFLoggerDelegate.errorLogger, invocator + ", permissions problem, response status = " + response.getStatus());
		}
	}
	
	public static int getExternalAppResponseCode() {
		String responseCode = MDC.get(EPSystemProperties.EXTERNAL_API_RESPONSE_CODE);
		int responseCodeInt = 0;
		try {
			if (responseCode != null && responseCode != "") {
				responseCodeInt = Integer.valueOf(responseCode);
			}
		} catch (Exception e){
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred in getResponseCode(). Details: "+EcompPortalUtils.getStackTrace(e));
		}
		return responseCodeInt;
	}
	
	// This method might be just for testing purposes.
	public static void setExternalAppResponseCode(int responseCode) {
		try {
			String responseCodeString = String.valueOf(responseCode);
			MDC.put(EPSystemProperties.EXTERNAL_API_RESPONSE_CODE, responseCodeString);
		} catch (Exception e) {
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred in setResponseCode(). Details: "+EcompPortalUtils.getStackTrace(e));
		}
	}
	
	public static String getHTTPStatusString(int httpStatusCode) {
		String httpStatusString = "unknown_error";
		try {
			httpStatusString = org.springframework.http.HttpStatus.valueOf(httpStatusCode).name();
			if (httpStatusString != null) {
				httpStatusString = httpStatusString.toLowerCase();
			}
		} catch (Exception e) {
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred in getHTTPStatusString(). Details: "+EcompPortalUtils.getStackTrace(e));			
		}
		return httpStatusString;
	}
	
	public static String getFEErrorString(Boolean internal, int responseCode) {
		// Return a String like the following:
		// "Internal Ecomp Error: 500 internal_server_error" or
		// "External App Error: 404 not_found"
		// TODO: create our own Ecomp error codes, starting with 1000 and up.
		String responseString = "";
		String internalExternalString = internal ? "Ecomp Error: " : "App Error: ";
		String httpStatusString = "unknown_error";
		try {
			if (responseCode < 1000) {
				httpStatusString = getHTTPStatusString(responseCode);
			}
		} catch (Exception e) {
			logger.error(EELFLoggerDelegate.errorLogger, "Exception occurred in getFEErrorString(). Details: "+EcompPortalUtils.getStackTrace(e));	
		}
		responseString = internalExternalString + responseCode + " " + httpStatusString;
		return responseString;
	}

	public static boolean isProductionBuild()
	{
		boolean productionBuild = true;
		String epVersion = EcompVersion.buildNumber;
		if (epVersion != null)
		{
			int buildNum = epVersion.lastIndexOf('.');
			if (buildNum > 0)
			{
				int buildNumber = Integer.parseInt(epVersion.substring(buildNum+1));
				if (buildNumber < 3000) // Production versions are 3000+,  (ie 1.0.3003)
				{
					productionBuild = false;
				}
			}
		}
	    return productionBuild;
	}
	
	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 getMyIpAdddress() {
		InetAddress ip;
		String localIp;
		try {
			ip = InetAddress.getLocalHost();
			localIp = ip.getHostAddress();
		} catch (UnknownHostException e) {
			localIp = "unknown";
			logger.error(EELFLoggerDelegate.errorLogger, EcompPortalUtils.getStackTrace(e));
		}
		return localIp;
	}
	
	public static String getMyHostName() {
		InetAddress ip;
		String hostName;
		try {
			ip = InetAddress.getLocalHost();
			hostName = ip.getHostName();
		} catch (UnknownHostException e) {
			hostName = "unknown";
			logger.error(EELFLoggerDelegate.errorLogger, EcompPortalUtils.getStackTrace(e));
		}
		return hostName;
	}
}