// 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.resource;

import java.util.List;
import java.util.Map;

import javax.ejb.Local;
import javax.naming.ConfigurationException;

import com.cloud.agent.AgentManager;
import com.cloud.agent.Listener;
import com.cloud.agent.api.AgentControlAnswer;
import com.cloud.agent.api.AgentControlCommand;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.Command;
import com.cloud.agent.api.StartupCommand;
import com.cloud.agent.api.StartupSecondaryStorageCommand;
import com.cloud.agent.manager.MockStorageManager;
import com.cloud.exception.ConnectionException;
import com.cloud.host.HostVO;
import com.cloud.host.Status;
import com.cloud.storage.SnapshotVO;
import com.cloud.storage.dao.SnapshotDao;
import com.cloud.storage.secondary.SecondaryStorageDiscoverer;
import com.cloud.utils.component.Inject;
import com.cloud.utils.exception.CloudRuntimeException;
@Local(value=Discoverer.class)
public class SimulatorSecondaryDiscoverer extends SecondaryStorageDiscoverer implements ResourceStateAdapter, Listener {
    @Inject MockStorageManager _mockStorageMgr = null;
    @Inject AgentManager _agentMgr;
    @Inject ResourceManager _resourceMgr;
    @Inject SnapshotDao _snapshotDao;
    
    @Override
    public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
    	_agentMgr.registerForHostEvents(this, true, false, false);
        _resourceMgr.registerResourceStateAdapter(this.getClass().getSimpleName(), this);
        return super.configure(name, params);
    }
    
    @Override
    public void postDiscovery(List<HostVO> hosts, long msId) {
        super.postDiscovery(hosts, msId);
        for (HostVO host: hosts) {
            _mockStorageMgr.preinstallTemplates(host.getStorageUrl(), host.getDataCenterId());
        }
    }

	@Override
	public HostVO createHostVOForConnectedAgent(HostVO host,
			StartupCommand[] cmd) {
		return null;
	}

	@Override
	public HostVO createHostVOForDirectConnectAgent(HostVO host,
			StartupCommand[] startup, ServerResource resource,
			Map<String, String> details, List<String> hostTags) {
		//for detecting SSVM dispatch
		StartupCommand firstCmd = startup[0];
	    if (!(firstCmd instanceof StartupSecondaryStorageCommand)) {
	    	return null;
	    }
	    
		host.setType(com.cloud.host.Host.Type.SecondaryStorageVM);
		return host;
	}

	@Override
	public DeleteHostAnswer deleteHost(HostVO host, boolean isForced,
			boolean isForceDeleteStorage) throws UnableDeleteHostException {
		long hostId = host.getId();
		List<SnapshotVO> snapshots = _snapshotDao.listByHostId(hostId);
		if (snapshots != null && !snapshots.isEmpty()) {
			throw new CloudRuntimeException("Cannot delete this secondary storage because there are still snapshots on it ");
		}
		_vmTemplateHostDao.deleteByHost(hostId);
		host.setGuid(null);
		_hostDao.update(hostId, host);
		_hostDao.remove(hostId);
		return new DeleteHostAnswer(true);
	}

    @Override
    public boolean start() {
        return true;
    }

    @Override
    public boolean stop() {
    	_resourceMgr.unregisterResourceStateAdapter(this.getClass().getSimpleName());
        return true;
    }

	@Override
	public int getTimeout() {
		return 0;
	}

	@Override
	public boolean isRecurring() {
		return false;
	}

	@Override
	public boolean processAnswers(long agentId, long seq, Answer[] answers) {
		return false;
	}

	@Override
	public boolean processCommands(long agentId, long seq, Command[] commands) {
		return false;
	}

	@Override
	public void processConnect(HostVO host, StartupCommand cmd,
			boolean forRebalance) throws ConnectionException {
		
	}

	@Override
	public AgentControlAnswer processControlCommand(long agentId,
			AgentControlCommand cmd) {
		return null;
	}

	@Override
	public boolean processDisconnect(long agentId, Status state) {
		return false;
	}

	@Override
	public boolean processTimeout(long agentId, long seq) {
		return false;
	}
}