// 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.bridge.service;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;

import com.cloud.bridge.service.exception.InternalErrorException;
import com.cloud.bridge.util.StringHelper;

public class UserContext {
    protected final static Logger logger = Logger.getLogger(UserContext.class);
    
	private static ThreadLocal<UserContext> threadUserContext = new ThreadLocal<UserContext>();

	private boolean annonymous = false;
	private String accessKey;
	private String secretKey;
	private String canonicalUserId;  // In our design, we re-use the accessKey to provide the canonicalUserId  -- TODO loPri - reconsider?
	private String description;
	private HttpServletRequest request = null;
	
	public UserContext() {
	}
	
	public static UserContext current() {
		UserContext context = threadUserContext.get();
		if (context == null) {
		    logger.debug("initializing a new [anonymous] UserContext!");
			context = new UserContext();
			threadUserContext.set(context);
		}
		return context;
	}
	
	public void initContext() {		
		annonymous = true;
	}
	
	public void initContext(String accessKey, String secretKey, String canonicalUserId, String description, HttpServletRequest request) {
		this.accessKey = accessKey;
		this.secretKey = secretKey;
		this.canonicalUserId = canonicalUserId;
		this.description = description;
		this.annonymous = false;
		this.request = request;
	}
	
	public HttpServletRequest getHttp() {
		return request;
	}
	
	public String getAccessKey() {
		if (annonymous)
			return StringHelper.EMPTY_STRING;
		
		if (accessKey == null) {
			logger.error("Fatal - UserContext has not been correctly setup");
			throw new InternalErrorException("Uninitalized user context");
		}
		return accessKey;
	}
	
	public String getSecretKey() {
		if (annonymous)
			return StringHelper.EMPTY_STRING;
		
		if (secretKey == null) {
			logger.error("Fatal - UserContext has not been correctly setup");
			throw new InternalErrorException("Uninitalized user context");
		}
		
		return secretKey;
	}
	
	public String getCanonicalUserId() {
		if (annonymous)
			return StringHelper.EMPTY_STRING;
		
		if (canonicalUserId == null) {
			logger.error("Fatal - UserContext has not been correctly setup");
			throw new InternalErrorException("Uninitalized user context");
		}
		
		return canonicalUserId;
	}
	
	public String getDescription() {
		if (description != null)
			return description;
		
		return StringHelper.EMPTY_STRING;
	}
}