package com.cloud.hypervisor.vmware;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

import com.cloud.cluster.CheckPointManager;
import com.cloud.cluster.CleanupMaid;
import com.cloud.hypervisor.vmware.manager.VmwareManager;
import com.cloud.hypervisor.vmware.mo.ClusterMO;
import com.cloud.hypervisor.vmware.mo.DatacenterMO;
import com.cloud.hypervisor.vmware.mo.HostMO;
import com.cloud.hypervisor.vmware.mo.VirtualMachineMO;
import com.cloud.hypervisor.vmware.util.VmwareContext;

public class VmwareCleanupMaid implements CleanupMaid {
    private static final Logger s_logger = Logger.getLogger(VmwareCleanupMaid.class);
    
    private static Map<String, List<VmwareCleanupMaid>> s_leftoverDummyVMs = new HashMap<String, List<VmwareCleanupMaid>>();
    
    private String _vCenterAddress;
    private String _dcMorValue;
    private String _hostMorValue;
    private String _vmName;
    private long _checkPoint;
    
	public VmwareCleanupMaid() {
	}
	
	public VmwareCleanupMaid(String hostGuid, String vmName) {
		String[] tokens = hostGuid.split("@");
		assert(tokens != null);
		assert(tokens.length == 2);
		_vCenterAddress = tokens[1];
		
		String[] hostTokens = tokens[0].split(":");
		assert(hostTokens != null);
		assert(hostTokens.length == 2);
		
		_hostMorValue = hostTokens[1];
		
		_vmName = vmName;
	}
	
	public VmwareCleanupMaid(String vCenterAddress, String dcMorValue, String vmName) {
		_vCenterAddress = vCenterAddress;
		_dcMorValue = dcMorValue;
		_vmName = vmName;
	}
	
	@Override
	public int cleanup(CheckPointManager checkPointMgr) {
		
		// save a check-point in case we crash at current run so that we won't lose it
		_checkPoint = checkPointMgr.pushCheckPoint(new VmwareCleanupMaid(_vCenterAddress, _dcMorValue, _vmName));
		addLeftOverVM(this);
		return 0;
	}

	@Override
	public String getCleanupProcedure() {
		return null;
	}
	
	public String getVCenterServer() {
		return _vCenterAddress;
	}
	
	public String getDatacenterMorValue() {
		return _dcMorValue;
	}
	
	public String getHostMorValue() {
		return _hostMorValue;
	}
	
	public String getVmName() {
		return _vmName;
	}
	
	public long getCheckPoint() {
		return _checkPoint;
	}
	
    private synchronized static void addLeftOverVM(VmwareCleanupMaid cleanupMaid) {
        List<VmwareCleanupMaid> l = s_leftoverDummyVMs.get(cleanupMaid.getVCenterServer());
        if(l == null) {
            l = new ArrayList<VmwareCleanupMaid>();
            s_leftoverDummyVMs.put(cleanupMaid.getVCenterServer(), l);
        }
        
        l.add(cleanupMaid);
    }
    
    public synchronized static void gcLeftOverVMs(VmwareContext context) {
        List<VmwareCleanupMaid> l = s_leftoverDummyVMs.get(context.getServerAddress());
        VmwareManager mgr = context.getStockObject(VmwareManager.CONTEXT_STOCK_NAME);
        assert(mgr != null);
        
        if(l != null && l.size() > 0) {
            for(VmwareCleanupMaid cleanupMaid : l) {
                try {
                    VirtualMachineMO vmMo = null;
                    if(cleanupMaid.getDatacenterMorValue() != null) {
                    	DatacenterMO dcMo = new DatacenterMO(context, "Datacenter", cleanupMaid.getDatacenterMorValue());
                    	vmMo = dcMo.findVm(cleanupMaid.getVmName());
                    } else {
                    	assert(cleanupMaid.getHostMorValue() != null);
                    	HostMO hostMo = new HostMO(context, "HostSystem", cleanupMaid.getHostMorValue());
                    	ClusterMO clusterMo = new ClusterMO(context, hostMo.getHyperHostCluster());
                    	vmMo = clusterMo.findVmOnHyperHost(cleanupMaid.getVmName());
                    }
                    
                    if(vmMo != null) {
                        s_logger.info("Found left over dummy VM " + cleanupMaid.getVmName() + ", destroy it");
                        vmMo.destroy();
                    }
                } catch(Throwable e) {
                    s_logger.warn("Unable to destroy left over dummy VM " + cleanupMaid.getVmName());
                } finally {
                	mgr.popCleanupCheckpoint(cleanupMaid.getCheckPoint());
                }
            }
            
            l.clear();
        }
    }
}