/**
 *
 */
package org.gcube.portlets.user.workspaceexplorerapp.server.workspace;

import javax.servlet.http.HttpSession;

import org.gcube.common.storagehubwrapper.server.StorageHubWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


// TODO: Auto-generated Javadoc
/**
 * The Class WsUtil.
 *
 * @author Francesco Mangiacrapa at ISTI-CNR Pisa (Italy)
 * Apr 9, 2020
 */
public class WsUtil {

	public static final Logger logger = LoggerFactory.getLogger(WsUtil.class);
	public static final String ENVIRONMENT_VARIABLE_SCOPE_NAME = "EnvironmentVariableScope";
	public static final String ENVIRONMENT_VARIABLE_TOKEN_NAME = "EnvironmentVariableAppToken";
	public static final String SESSION_SCOPE = "session_scope";

	/**
	 * Gets the storage hub wrapper.
	 *
	 * @param httpSession the http session
	 * @return the storage hub wrapper
	 * @throws Exception the exception
	 */
	private static StorageHubWrapper getStorageHubWrapper(HttpSession httpSession) throws Exception {

		try {
			String scope = getScope(httpSession);
			String applicationToken = getApplicationToken(httpSession);
			
			if(applicationToken==null || applicationToken.isEmpty()) {
				String token = "9b397e7a-c683-44dc-b65b-53725b98f7e5-98187548";
				applicationToken = token;
				// TODO
				logger.warn("\n\n\nALERT!!!! FALLBACK DETECTED TO INSTANCE THE SHUB\n\n");
				logger.warn("Calling the " + StorageHubWrapper.class.getSimpleName() + 
						" by token: " + token.substring(0, 10) +" MASKED TOKEN" + 
						" by using the scope: " + scope);
				logger.warn("\n\n\n HAVE TO REMOVE THIS CODE!!!\n\n\n");
		
			}
			
			return new StorageHubWrapper(scope, applicationToken, false, false, false);
		} catch (Exception e) {
			logger.error("Error when instancing the storageHub wrapper", e);
			throw new Exception("Error on inizializing the StorageHub wrapper. Please contact the support!");
		}
	}
	
	/**
	 * Gets the workpace.
	 *
	 * @param httpSession the http session
	 * @return the workpace
	 * @throws Exception the exception
	 */
	public static org.gcube.common.storagehubwrapper.server.tohl.Workspace getWorkspace(HttpSession httpSession) throws Exception {

		try {
			StorageHubWrapper wrapper = getStorageHubWrapper(httpSession);
			return wrapper.getWorkspace();
		} catch (Exception e) {
			logger.error("Error on getting the Workspace", e);
			throw new Exception("Error on getting the Workspace");
		}
	}

	/**
	 * Gets the scope.
	 *
	 * @param httpSession the http session
	 * @return the scope
	 */
	public static String getScope(HttpSession httpSession) {
		String scope = (String) httpSession.getAttribute(SESSION_SCOPE);
		logger.info("Variable " + SESSION_SCOPE + " read from httpsession is: " + scope);

		if (scope == null) {
			logger.info("Variable " + SESSION_SCOPE + " is null reading from web.xml context");
			String variableScopeName = httpSession.getServletContext()
					.getInitParameter(ENVIRONMENT_VARIABLE_SCOPE_NAME);
			logger.info("Found param-value '" + variableScopeName
					+ "' from web context, reading its value from ENVIRONMENT");
			scope = System.getenv(variableScopeName);
			logger.info("Value of " + variableScopeName + " from ENVIRONMENT is: " + scope);
		}

		httpSession.setAttribute(ENVIRONMENT_VARIABLE_SCOPE_NAME, scope);
		return scope;
	}

	
	/**
	 * Gets the application token.
	 *
	 * @param httpSession the http session
	 * @return the application token
	 */
	public static String getApplicationToken(HttpSession httpSession) {

		String appToken = null;
		String appTokenEnvVarName = null;
		try {
			logger.info("Reading " + ENVIRONMENT_VARIABLE_TOKEN_NAME + " from web.xml context");
			appTokenEnvVarName = httpSession.getServletContext()
					.getInitParameter(ENVIRONMENT_VARIABLE_TOKEN_NAME);
			logger.info("Found param-value '" + appTokenEnvVarName
					+ "' from web context, reading its value from ENVIRONMENT");
			appToken = System.getenv(appTokenEnvVarName);
			logger.info("Value of " + appTokenEnvVarName + " from ENVIRONMENT is: " + appToken);
		
		}catch (Exception e) {
			logger.error("Error on reading the ENV VARIABLE '"+appTokenEnvVarName+"' from ENVIRONMENT");
		}
	
		return appToken;
	}
}