package com.c2kernel.utils;

import com.c2kernel.common.InvalidDataException;
import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.entity.proxy.ItemProxy;
import com.c2kernel.lifecycle.ActivityDef;
import com.c2kernel.lookup.DomainPath;
import com.c2kernel.persistency.ClusterStorage;
import com.c2kernel.persistency.ClusterStorageException;
import com.c2kernel.persistency.outcome.Schema;
import com.c2kernel.persistency.outcome.Viewpoint;
import com.c2kernel.process.Gateway;

public class LocalObjectLoader {
	private static ActDefCache actCache = new ActDefCache();

	static public ItemProxy loadLocalObjectDef(String root, String name)
		throws ObjectNotFoundException
	{
		DomainPath defRoot = new DomainPath(root);
	    DomainPath defPath = (DomainPath)defRoot.find(name);
	    return (ItemProxy)Gateway.getProxyManager().getProxy(defPath);
	}

	static public String getScript(String scriptName, String scriptVersion) throws ObjectNotFoundException {
	    Logger.msg(5, "Loading script "+scriptName+" v"+scriptVersion);
	    try {
	    	ItemProxy script = loadLocalObjectDef("/desc/Script/", scriptName);
   	        Viewpoint scriptView = (Viewpoint)script.getObject(ClusterStorage.VIEWPOINT + "/Script/" + scriptVersion);
	    	return scriptView.getOutcome().getData();
	    } catch (ClusterStorageException ex) {
	    	Logger.error(ex);
	        throw new ObjectNotFoundException("Error loading script " + scriptName + " version " + scriptVersion, "");
	    }

	}

	static public Schema getSchema(String schemaName, int schemaVersion) throws ObjectNotFoundException {
		Logger.msg(5, "Loading schema "+schemaName+" v"+schemaVersion);
	    Schema thisSchema = new Schema();
	    thisSchema.docType = schemaName;
	    thisSchema.docVersion = schemaVersion;

	    // don't bother if this is the Schema schema - for bootstrap esp.
	    if (schemaName.equals("Schema") && schemaVersion == 0) {
	        thisSchema.breakApart = false;
	        thisSchema.schema="";
	        return thisSchema;
	    }

	        ItemProxy schema = loadLocalObjectDef("/desc/OutcomeDesc/", schemaName);
	        Viewpoint schemaView = (Viewpoint)schema.getObject(ClusterStorage.VIEWPOINT + "/Schema/" + schemaVersion);
	        try {
	        	thisSchema.schema = schemaView.getOutcome().getData();
	        } catch (ClusterStorageException ex) {
	        	Logger.error(ex);
	        	throw new ObjectNotFoundException("Problem loading schema "+schemaName+" v"+schemaVersion+": "+ex.getMessage(), "");
	        }
	        String breakApart = schema.getProperty("BreakApart");
	        thisSchema.breakApart = breakApart.equals("1");

	    return thisSchema;
	}

	/**
	 * Retrieves a named version of activity def from the database
	 *
	 * @param actName - activity name
	 * @param version - named version (String)
	 * @return ActivityDef
	 * @throws ObjectNotFoundException - When activity or version does not exist
	 */
	static public ActivityDef getActDef(String actName, String actVersion) throws ObjectNotFoundException, InvalidDataException {
		Logger.msg(5, "Loading activity def "+actName+" v"+actVersion);
		return actCache.get(actName, actVersion);
	}
}