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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.dropdown;

import java.util.ArrayList;
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 org.ogema.core.resourcemanager.AccessPriority;
import org.ogema.core.resourcemanager.pattern.ResourcePattern;

import de.iwes.widgets.api.widgets.sessionmanagement.OgemaHttpRequest;
import de.iwes.widgets.html.alert.Alert;
import de.iwes.widgets.html.form.dropdown.DropdownOption;
import de.iwes.widgets.html.form.dropdown.DropdownData;

public class ReferenceDropdownData extends DropdownData {
	
	private Resource resource = null;
	private Resource referenceTarget = null;
	private Class type = null;
	private final ApplicationManager am;
	public static final String EMPTY_OPTION_ID = "empty__option__id";
	private final Alert alert; // may be null

	public ReferenceDropdownData(ReferenceDropdown dropdown, ApplicationManager am, Alert alert) {
		super(dropdown);
		this.am = am;
		this.alert = alert;
	}
	
	@Override
	public JSONObject retrieveGETData(OgemaHttpRequest req) {
		setOptions(getDDOptions());
		return super.retrieveGETData(req);
	}
	
	@Override
	public JSONObject onPOST(String json, OgemaHttpRequest req) {
		JSONObject result =  super.onPOST(json, req);
		String newLocation = getSelectedValue();
		if (newLocation == null || newLocation.equals(EMPTY_OPTION_ID)) {
			referenceTarget = null;
			return result;
		}
		referenceTarget = am.getResourceAccess().getResource(newLocation);
		if (resource != null) {
			try {
				if (!resource.equals(referenceTarget)) 
					resource.setAsReference(referenceTarget);
			} catch (Exception e) {
				if (alert != null)
					alert.showAlert("Could not set resource " + resource.getPath() + " as a reference: " + e, false, req);
			}
		}
		return result;
	}


	public Resource getResource() {
		return resource;
	}
	
	public Resource getReferenceTarget() {
		return referenceTarget;
	}

	public void setResource(Resource resource, Class targetType) {
		if (resource != null && targetType == null)
			targetType = resource.getResourceType();
		if (resource != null && resource.isTopLevel())
			throw new IllegalArgumentException("Cannot set a toplevel resource as a reference.");
		if (targetType != null && !Resource.class.isAssignableFrom(targetType) && !ResourcePattern.class.isAssignableFrom(targetType))
			throw new IllegalArgumentException("Class must be either a resource type or resource pattern type");
		this.resource = resource;
		this.type = targetType;
	}

	public Class getType() {
		return type;
	}
	
	@SuppressWarnings("unchecked")
	private List getDDOptions() {
		if (resource == null && type == null) {
			return Collections.emptyList();
		}
		String resLocation;
		if (resource != null)
			resLocation = resource.getLocation();
		else
			resLocation = EMPTY_OPTION_ID; // previous value
		boolean selectedFound = false;
		List opts = new ArrayList();
		if (resource == null || !resource.isReference(true)) {
			opts.add(new DropdownOption(EMPTY_OPTION_ID, "", true));
		}
		if (Resource.class.isAssignableFrom(type)) {
			List resources = am.getResourceAccess().getResources((Class) type);
			for (Resource res: resources) {
				if (res.equals(resource))
					continue;
				String path = res.getPath();
				boolean sel = path.equals(resLocation);
				if (sel)
					selectedFound = true;
				DropdownOption opt = new DropdownOption(path, path, sel);
				opts.add(opt);
			}
		}
		else if (ResourcePattern.class.isAssignableFrom(type)) {
			@SuppressWarnings("rawtypes")
			List> patterns = (List>)
				am.getResourcePatternAccess().getPatterns((Class) type, AccessPriority.PRIO_LOWEST);
			for (ResourcePattern pattern: patterns) {
				String path = pattern.model.getPath();
				boolean sel = path.equals(resLocation);
				if (sel)
					selectedFound = true;
				DropdownOption opt = new DropdownOption(path, path, sel);
				opts.add(opt);
			}
		}
		if (!selectedFound && !opts.isEmpty()) {
			opts.get(0).select(true);
		}
		return opts;
	}
	
}