/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 *******************************************************************************/
package at.gv.egovernment.moa.id.protocols.stork2;

import at.gv.egovernment.moa.id.commons.MOAIDConstants;
import at.gv.egovernment.moa.id.config.stork.StorkAttributeProviderPlugin;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.AttributeProvider;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.EHvdAttributeProviderPlugin;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.MandateAttributeRequestProvider;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.PVPAuthenticationProvider;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.SignedDocAttributeRequestProvider;
import at.gv.egovernment.moa.id.protocols.stork2.attributeproviders.StorkAttributeRequestProvider;
import at.gv.egovernment.moa.logging.Logger;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.PriorityQueue;

/**
 * A factory for creating AttributeProvider objects.
 */
public class AttributeProviderFactory {

    /**
     * Gets the available plugins.
     *
     * @return the available plugins
     */
    public static List<String> getAvailablePlugins() {
        return MOAIDConstants.ALLOWED_STORKATTRIBUTEPROVIDERS;
    }

    /**
     * Creates an AttributeProvider object for the given shortname. Returns
     * {@code null} if there is no such provider available.
     *
     * @param shortname the simpleName for the providers class
     * @return the attribute provider
     */
    public static AttributeProvider create(String shortname, String url, String attributes) {
        if (shortname.equals("StorkAttributeRequestProvider")) {
            return new StorkAttributeRequestProvider(url, attributes);
        } else if (shortname.equals("EHvdAttributeProvider")) {
            return new EHvdAttributeProviderPlugin(url, attributes);
        } else if (shortname.equals("SignedDocAttributeRequestProvider")) {
            return new SignedDocAttributeRequestProvider(url, attributes);
        } else if (shortname.equals("MandateAttributeRequestProvider")) {
            try {
                return new MandateAttributeRequestProvider(url, attributes);
            } catch (Exception ex) {
                ex.printStackTrace();
                return null;
            }
        } else if (shortname.equals("PVPAuthenticationProvider")) {
        	return new PVPAuthenticationProvider(url, attributes);
        } else {
            return null;
        }
    }

    /**
     * Gets fresh instances of the configured plugins.
     *
     * @param collection the configured a ps
     * @return the configured plugins
     */
    public static Iterator<AttributeProvider> getConfiguredPlugins(
            Collection<StorkAttributeProviderPlugin> collection) {

    	PriorityQueue<AttributeProvider> result = new PriorityQueue<AttributeProvider>();
        for (StorkAttributeProviderPlugin current : collection) {

            result.add(create(current.getName(), current.getUrl(), current.getAttributes()));
            Logger.debug("Adding configured attribute provider: " + current.getClass().getName() + current.getName() + " at " + current.getUrl());
        }

        return result.iterator();
    }
}