// 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.storage.download;

import org.apache.cloudstack.storage.command.DownloadProgressCommand.RequestType;
import org.apache.log4j.Level;

import com.cloud.agent.api.storage.DownloadAnswer;
import com.cloud.storage.VMTemplateStorageResourceAssoc.Status;

public abstract class DownloadActiveState extends DownloadState {

	public DownloadActiveState(DownloadListener dl) {
		super(dl);
	}


	@Override
	public String handleAnswer(DownloadAnswer answer) {
		if (s_logger.isTraceEnabled()) {
			s_logger.trace("handleAnswer, answer status=" + answer.getDownloadStatus() + ", curr state=" + getName());
		}
		switch (answer.getDownloadStatus()) {
		case DOWNLOAD_IN_PROGRESS:
			getDownloadListener().scheduleStatusCheck(RequestType.GET_STATUS);
			return Status.DOWNLOAD_IN_PROGRESS.toString();
		case DOWNLOADED:
			getDownloadListener().cancelTimeoutTask();
			return Status.DOWNLOADED.toString();
		case NOT_DOWNLOADED:
			getDownloadListener().scheduleStatusCheck(RequestType.GET_STATUS);
			return Status.NOT_DOWNLOADED.toString();
		case DOWNLOAD_ERROR:
			getDownloadListener().cancelStatusTask();
			getDownloadListener().cancelTimeoutTask();
			return Status.DOWNLOAD_ERROR.toString();
		case UNKNOWN:
			getDownloadListener().cancelStatusTask();
			getDownloadListener().cancelTimeoutTask();
			return Status.DOWNLOAD_ERROR.toString();
		default:
			return null;
		}
	}
	
	@Override
	public  void onEntry(String prevState, DownloadEvent event, Object evtObj) {
		if (s_logger.isTraceEnabled()) {
			getDownloadListener().log("onEntry, prev state= " + prevState + ", curr state=" + getName() + ", event=" + event, Level.TRACE);
		}
		
		if (event==DownloadEvent.DOWNLOAD_ANSWER) {
			getDownloadListener().callback((DownloadAnswer)evtObj);
			getDownloadListener().setLastUpdated();
		}
		
	}
	
	@Override
	public  void onExit() {
	}
	
	@Override
	public  String handleTimeout(long updateMs) {
		if (s_logger.isTraceEnabled()) {
			getDownloadListener().log("handleTimeout, updateMs=" + updateMs + ", curr state= " + getName(), Level.TRACE);
		}
		String newState = this.getName();
		if (updateMs > 5*DownloadListener.STATUS_POLL_INTERVAL){
			newState=Status.DOWNLOAD_ERROR.toString();
			getDownloadListener().log("timeout: transitioning to download error state, currstate=" + getName(), Level.DEBUG );
		} else if (updateMs > 3*DownloadListener.STATUS_POLL_INTERVAL) {
			getDownloadListener().cancelStatusTask();
			getDownloadListener().scheduleImmediateStatusCheck(RequestType.GET_STATUS);
			getDownloadListener().scheduleTimeoutTask(3*DownloadListener.STATUS_POLL_INTERVAL);
			getDownloadListener().log(getName() + " first timeout: checking again ", Level.DEBUG );
		} else {
			getDownloadListener().scheduleTimeoutTask(3*DownloadListener.STATUS_POLL_INTERVAL);
		}
		return newState;
	}
	
	@Override
	public  String handleAbort(){
		return Status.ABANDONED.toString();
	}
	
	@Override
	public  String handleDisconnect(){

		return Status.DOWNLOAD_ERROR.toString();
	}

}
