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/**
 * Copyright 2014-2018 Fraunhofer-Gesellschaft zur Förderung der angewandten Wissenschaften e.V.
 *
 * Licensed 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 de.iwes.widgets.resource.widget.table;

import java.util.Collections;
import java.util.List;
import org.json.JSONObject;
import org.ogema.core.application.ApplicationManager;
import org.ogema.core.model.Resource;

import de.iwes.widgets.api.extended.mode.UpdateMode;
import de.iwes.widgets.api.extended.resource.ResourceWidgetData;
import de.iwes.widgets.api.widgets.sessionmanagement.OgemaHttpRequest;
import de.iwes.widgets.html.complextable.DynamicTableData;

public class ResourceTableData extends DynamicTableData implements ResourceWidgetData {

	protected final UpdateMode updateMode;
	protected final ApplicationManager am;
	protected final Class type;
	protected volatile Class currentType;
	
	public ResourceTableData(ResourceTable table, Class type, UpdateMode updateMode, ApplicationManager am) {
		super(table);
		this.updateMode = updateMode;
		this.am = am;
		this.type = type;
		this.currentType = type;
		// TODO if updateMode = LISTENER register listener in constructor // change it every time setType is called!
	}
	
	@Override
	public JSONObject retrieveGETData(OgemaHttpRequest req) {
		if (updateMode == UpdateMode.AUTO_ON_GET) {
			writeLock(); 
			try {
				updateOnGet();
			} finally {
				writeUnlock();
			}
		}
		return super.retrieveGETData(req);
	}
	
	@SuppressWarnings({ "unchecked", "rawtypes" })
	protected void updateOnGet() {
		List newResources;
		if (currentType != null)
			newResources = am.getResourceAccess().getResources(currentType);
		else
			newResources = Collections.emptyList();
		updateRows((List) newResources);
	}

	@Override
	public void setType(Class type) {
		writeLock();
		try {
			this.currentType = type;
			if (updateMode != UpdateMode.MANUAL) {
				updateOnGet();
			}
		} finally {
			writeUnlock();
		}
	}

	@Override
	public Class getType() {
		return currentType;
	}
	
	

}