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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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 org.wildfly.security.sasl.util;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.function.Predicate;

import javax.security.auth.callback.CallbackHandler;
import javax.security.sasl.SaslClient;
import javax.security.sasl.SaslClientFactory;
import javax.security.sasl.SaslException;

import org.wildfly.common.Assert;
import org.wildfly.common.math.HashMath;

/**
 * A {@link SaslClientFactory} which filters available mechanisms (either inclusively or exclusively) from a delegate
 * {@code SaslClientFactory}.
 *
 * @author David M. Lloyd
 */
public final class FilterMechanismSaslClientFactory extends AbstractDelegatingSaslClientFactory {
    private final Predicate predicate;

    /**
     * Construct a new instance.
     *
     * @param delegate the factory to delegate to
     * @param predicate the mechanism name predicate
     */
    public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, final Predicate predicate) {
        super(delegate);
        Assert.checkNotNullParam("predicate", predicate);
        this.predicate = predicate;
    }

    /**
     * Construct a new instance.
     *
     * @param delegate the factory to delegate to
     * @param include {@code true} to only include the given mechanisms, {@code false} to exclude them
     * @param mechanisms the mechanisms to include or exclude
     */
    public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, boolean include, String... mechanisms) {
        super(delegate);
        Assert.checkNotNullParam("mechanisms", mechanisms);
        final HashSet set = new HashSet(mechanisms.length);
        Collections.addAll(set, mechanisms);
        Predicate predicate = set::contains;
        this.predicate = include ? predicate : predicate.negate();
    }

    /**
     * Construct a new instance.
     *
     * @param delegate the factory to delegate to
     * @param include {@code true} to only include the given mechanisms, {@code false} to exclude them
     * @param mechanisms the mechanisms to include or exclude
     */
    public FilterMechanismSaslClientFactory(final SaslClientFactory delegate, boolean include, Collection mechanisms) {
        super(delegate);
        Assert.checkNotNullParam("mechanisms", mechanisms);
        final HashSet set = new HashSet(mechanisms);
        Predicate predicate = set::contains;
        this.predicate = include ? predicate : predicate.negate();
    }

    public SaslClient createSaslClient(final String[] mechanisms, final String authorizationId, final String protocol, final String serverName, final Map props, final CallbackHandler cbh) throws SaslException {
        for (String mechanism : mechanisms) {
            if (! predicate.test(mechanism)) {
                // make a copy and remove the unsupported mechanisms
                final ArrayList list = new ArrayList<>(mechanisms.length - 1);
                for (String m2 : mechanisms) {
                    if (predicate.test(m2)) {
                        list.add(m2);
                    }
                }
                if (list.size() == 0) { return null; }
                return delegate.createSaslClient(list.toArray(new String[list.size()]), authorizationId, protocol, serverName, props, cbh);
            }
        }
        return delegate.createSaslClient(mechanisms, authorizationId, protocol, serverName, props, cbh);
    }

    public String[] getMechanismNames(final Map props) {
        final String[] names = delegate.getMechanismNames(props);
        final ArrayList list = new ArrayList<>(names.length);
        for (String name : names) {
            if (predicate.test(name)) {
                list.add(name);
            }
        }
        return list.toArray(new String[list.size()]);
    }

    @SuppressWarnings("checkstyle:equalshashcode")
    public boolean equals(final Object other) {
        return other instanceof FilterMechanismSaslClientFactory && equals((FilterMechanismSaslClientFactory) other);
    }

    @SuppressWarnings("checkstyle:equalshashcode")
    public boolean equals(final AbstractDelegatingSaslClientFactory other) {
        return other instanceof FilterMechanismSaslClientFactory && equals((FilterMechanismSaslClientFactory) other);
    }

    @SuppressWarnings("checkstyle:equalshashcode")
    public boolean equals(final FilterMechanismSaslClientFactory other) {
        return super.equals(other) && predicate.equals(other.predicate);
    }

    protected int calculateHashCode() {
        return HashMath.multiHashOrdered(HashMath.multiHashOrdered(super.calculateHashCode(), getClass().hashCode()), predicate.hashCode());
    }
}