// 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 class DownloadErrorState extends DownloadInactiveState {

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


	@Override
	public String handleAnswer(DownloadAnswer answer) {
		switch (answer.getDownloadStatus()) {
		case DOWNLOAD_IN_PROGRESS:
			getDownloadListener().scheduleStatusCheck(RequestType.GET_STATUS);
			return Status.DOWNLOAD_IN_PROGRESS.toString();
		case DOWNLOADED:
			getDownloadListener().scheduleImmediateStatusCheck(RequestType.PURGE);
			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 String handleAbort() {
		return Status.ABANDONED.toString();
	}


	@Override
	public String getName() {
		return Status.DOWNLOAD_ERROR.toString();
	}


	@Override
	public void onEntry(String prevState, DownloadEvent event, Object evtObj) {
		super.onEntry(prevState, event, evtObj);
		if (event==DownloadEvent.DISCONNECT){
			getDownloadListener().logDisconnect();
			getDownloadListener().cancelStatusTask();
			getDownloadListener().cancelTimeoutTask();
			DownloadAnswer answer = new DownloadAnswer("Storage agent or storage VM disconnected", Status.DOWNLOAD_ERROR);
			getDownloadListener().callback(answer);  
			getDownloadListener().log("Entering download error state because the storage host disconnected", Level.WARN);
		} else if (event==DownloadEvent.TIMEOUT_CHECK){
			DownloadAnswer answer = new DownloadAnswer("Timeout waiting for response from storage host", Status.DOWNLOAD_ERROR);
			getDownloadListener().callback(answer);
			getDownloadListener().log("Entering download error state: timeout waiting for response from storage host", Level.WARN);
		}
		getDownloadListener().setDownloadInactive(Status.DOWNLOAD_ERROR);
	}


}
