package net.floodlightcontroller.core.internal;

import java.util.Collection;
import java.util.List;

import org.openflow.protocol.OFPhysicalPort;

import com.thinkaurelius.titan.core.TitanException;
import com.thinkaurelius.titan.core.TitanFactory;
import com.thinkaurelius.titan.core.TitanGraph;
import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.TransactionalGraph.Conclusion;
import com.tinkerpop.blueprints.Edge;
import com.tinkerpop.blueprints.Vertex;
import net.floodlightcontroller.core.ISwitchStorage;

public class SwitchStorageImpl implements ISwitchStorage {
	public TitanGraph graph;

	@Override
	public void update(String dpid, SwitchState state, DM_OPERATION op) {
		// TODO Auto-generated method stub
        switch(op) {

        	case UPDATE:
        	case INSERT:
        	case CREATE:
                addSwitch(dpid);
                if (state != SwitchState.ACTIVE) {
                	setStatus(dpid, state);
                }
                break;
        	case DELETE:
                deleteSwitch(dpid);
                break;
        	default:
        }
	}

	private void setStatus(String dpid, SwitchState state) {
		// TODO Auto-generated method stub
		Vertex sw;
		try {
            if ((sw = graph.getVertices("dpid",dpid).iterator().next()) != null) {
            	sw.setProperty("state",state);
            	graph.stopTransaction(Conclusion.SUCCESS);
            }
		} catch (TitanException e) {
             // TODO: handle exceptions
		}
            	
		
	}

	@Override
	public void addPort(String dpid, OFPhysicalPort port) {
		// TODO Auto-generated method stub
		Vertex sw;
		try {
            if ((sw = graph.getVertices("dpid",dpid).iterator().next()) != null) {
            	// TODO: Check if port exists
            	Vertex p = graph.addVertex(null);
            	p.setProperty("number",port.getPortNumber());
            	p.setProperty("state",port.getState());
            	p.setProperty("desc",port.getName());
            	Edge e = graph.addEdge(null, sw, p, "on");
            	e.setProperty("state","ACTIVE");
            	e.setProperty("number", port.getPortNumber());
            	
            	graph.stopTransaction(Conclusion.SUCCESS);
            }
		} catch (TitanException e) {
             // TODO: handle exceptions
		}	

	}

	@Override
	public Collection<OFPhysicalPort> getPorts(long dpid) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public OFPhysicalPort getPort(String dpid, short portnum) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public OFPhysicalPort getPort(String dpid, String portName) {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void addSwitch(String dpid) {
		
        try {
            if (graph.getVertices("dpid",dpid).iterator().hasNext()) {
                    /*
                     *  Do nothing or throw exception?
                     */
            } else {
                    Vertex sw = graph.addVertex(null);

                    sw.setProperty("type","switch");
                    sw.setProperty("dpid", dpid);
                    sw.setProperty("state",SwitchState.ACTIVE);
                    graph.stopTransaction(Conclusion.SUCCESS);
            }
    } catch (TitanException e) {
            /*
             * retry till we succeed?
             */
    }


	}

	@Override
	public void deleteSwitch(String dpid) {
		// TODO Setting inactive but we need to eventually remove data
		setStatus(dpid, SwitchState.INACTIVE);

	}

	@Override
	public void deletePort(String dpid, short port) {
		// TODO Auto-generated method stub
		Vertex sw;
		try {
            if ((sw = graph.getVertices("dpid",dpid).iterator().next()) != null) {
            	// TODO: Check if port exists
            	Vertex p = sw.query().direction(Direction.OUT).labels("on").has("number",port).vertices().iterator().next();
            	graph.removeVertex(p);
            	graph.stopTransaction(Conclusion.SUCCESS);
            }
		} catch (TitanException e) {
             // TODO: handle exceptions
		}	


	}

	@Override
	public void deletePort(String dpid, String portName) {
		// TODO Auto-generated method stub

	}

	@Override
	public List<String> getActiveSwitches() {
		// TODO Auto-generated method stub
		return null;
	}

	@Override
	public void init(String conf) {
        graph = TitanFactory.open(conf);
        graph.createKeyIndex("dpid", Vertex.class);

	}

}