package com.c2kernel.lifecycle.instance.predefined;

import java.util.Arrays;

import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.events.Event;
import com.c2kernel.lookup.AgentPath;
import com.c2kernel.lookup.ItemPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;
import com.c2kernel.utils.Logger;

public class WriteViewpoint extends PredefinedStep {

	public WriteViewpoint() {
		super();
	}

	@Override
	protected String runActivityLogic(AgentPath agent, ItemPath item,
			int transitionID, String requestData) throws InvalidDataException {
		
		String schemaName;
		String viewName;
		int evId;

        String[] params = getDataList(requestData);
        if (Logger.doLog(3)) Logger.msg(3, "WriteViewpoint: called by "+agent+" on "+item+" with parameters "+Arrays.toString(params));

        // outcometype, name and evId. Event and Outcome should be checked so schema version should be discovered.
        if (params.length != 3)
            throw new InvalidDataException("WriteViewpoint: Invalid parameters "+Arrays.toString(params), "");
        
        schemaName = params[0];
        viewName = params[1];

        try {
        	evId = Integer.parseInt(params[2]);
        } catch (NumberFormatException ex) {
        	throw new InvalidDataException("WriteViewpoint: Parameter 3 (EventId) must be an integer", "");
        }

        // Find event
        
        Event ev;
       	try {
			ev = (Event)Gateway.getStorage().get(item, ClusterStorage.HISTORY+"/"+evId, null);
		} catch (ObjectNotFoundException e) {
			Logger.error(e);
			throw new InvalidDataException("WriteViewpoint: Event "+evId+" not found", "");
		} catch (ClusterStorageException e) {
			Logger.error(e);
			throw new InvalidDataException("WriteViewpoint: Exception loading event", "");
		}
        
        // Write new viewpoint
        Viewpoint newView = new Viewpoint(item, schemaName, viewName, ev.getSchemaVersion(), evId);
        try {
			Gateway.getStorage().put(item, newView, null);
		} catch (ClusterStorageException e) {
			Logger.error(e);
			throw new InvalidDataException("WriteViewpoint: Could not store new viewpoint", "");
		}
        return requestData;
	}

}