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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.autocomplete;

import java.util.ArrayList;
import java.util.List;

import org.json.JSONObject;
import org.ogema.core.model.Resource;
import org.ogema.core.resourcemanager.ResourceAccess;

import de.iwes.widgets.api.widgets.sessionmanagement.OgemaHttpRequest;
import de.iwes.widgets.html.autocomplete.AutocompleteData;

public class ResourcePathAutocompleteData extends AutocompleteData {
	
	private boolean showOnlyToplevel = false;
	private Class resType = Resource.class;
	private final ResourceAccess ra;
	private final boolean showDirectReferences;

	public ResourcePathAutocompleteData(ResourcePathAutocomplete pathAutocomplete, ResourceAccess ra, boolean showDirectReferences) {
		super(pathAutocomplete);
		this.ra= ra;
		this.showDirectReferences = showDirectReferences;
	}
	
	@Override
	public JSONObject retrieveGETData(OgemaHttpRequest req) {
		List newOptions = getResourcePaths();
		String value = getValue();
		if (value != null && !value.isEmpty() && !newOptions.contains(value)) {
			setValue("");
		}
		setOptions(newOptions);
		return super.retrieveGETData(req);
	}
	
	/*
	 * Public methods
	 */

	public boolean showOnlyToplevel() {
		return showOnlyToplevel;
	}

	public void setShowOnlyToplevel(boolean showOnlyToplevel) {
		this.showOnlyToplevel = showOnlyToplevel;
	}

	public Class getResourceType() {
		return resType;
	}

	public void setResourceType(Class resType) {
		this.resType = resType;
	}

	/*
	 * Internal
	 */
	
	@SuppressWarnings("unchecked")
	private List getResourcePaths() {
		List resources;
		if (showOnlyToplevel)
			resources = (List) ra.getToplevelResources(resType);
		else
			resources = (List) ra.getResources(resType);
		List paths = new ArrayList();
		for (Resource res: resources) {
			if (((ResourcePathAutocomplete) widget).filter(res))
				addResource(res, paths);
		}
		return paths;
	}
	
	private void addResource(Resource res, List paths) {
		paths.add(res.getPath());
		if (showDirectReferences) {
			List references = res.getReferencingResources(null);
			int sz = references.size();
			// this may equal to 1 even though no reference exist... the actual parent is always contained, if it is not a toplevel res
			if (sz < 1) return; 
			Class currentType = res.getResourceType();
			for (Resource refParent: references) {
				Resource ref = getReferencingSubresource(refParent, res, currentType);
				if (ref == null || ref.equals(res)) 
					continue; 
				if (ref.isReference(false) && !paths.contains(ref.getPath()))
					addResource(ref, paths);
			}
		}
	}
	
	private Resource getReferencingSubresource(Resource parent, Resource target, Class type) {
		List subs = parent.getSubResources(type, false);
		for (Resource res: subs) {
			if (res.equalsLocation(target))
				return res;
		}
		return null;
	}
	
	public Resource getSelectedResource() {
		if (getValue() == null)
			return null;
		return ra.getResource(getValue());
	}
	
}