/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.eclipse.aether.internal.transport.wagon;

import javax.inject.Inject;
import javax.inject.Named;
import javax.inject.Singleton;

import org.apache.maven.wagon.Wagon;
import org.codehaus.plexus.PlexusContainer;
import org.codehaus.plexus.classworlds.realm.ClassRealm;
import org.codehaus.plexus.component.configurator.AbstractComponentConfigurator;
import org.codehaus.plexus.component.configurator.ComponentConfigurationException;
import org.codehaus.plexus.component.configurator.ConfigurationListener;
import org.codehaus.plexus.component.configurator.converters.composite.ObjectWithFieldsConverter;
import org.codehaus.plexus.component.configurator.expression.ExpressionEvaluator;
import org.codehaus.plexus.configuration.PlexusConfiguration;
import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
import org.codehaus.plexus.util.xml.Xpp3Dom;
import org.eclipse.aether.transport.wagon.WagonConfigurator;

import static java.util.Objects.requireNonNull;

/**
 * A wagon configurator based on the Plexus component configuration framework.
 */
@Named("plexus")
@Singleton
public class PlexusWagonConfigurator implements WagonConfigurator {
    private final PlexusContainer container;

    /**
     * Creates a wagon configurator using the specified Plexus container.
     *
     * @param container The Plexus container instance to use, must not be {@code null}.
     */
    @Inject
    public PlexusWagonConfigurator(final PlexusContainer container) {
        this.container = requireNonNull(container, "plexus container cannot be null");
    }

    public void configure(Wagon wagon, Object configuration) throws Exception {
        requireNonNull(wagon, "wagon cannot be null");
        requireNonNull(configuration, "configuration cannot be null");

        PlexusConfiguration config;
        if (configuration instanceof PlexusConfiguration) {
            config = (PlexusConfiguration) configuration;
        } else if (configuration instanceof Xpp3Dom) {
            config = new XmlPlexusConfiguration((Xpp3Dom) configuration);
        } else {
            throw new IllegalArgumentException(
                    "unexpected configuration type: " + configuration.getClass().getName());
        }

        WagonComponentConfigurator configurator = new WagonComponentConfigurator();

        configurator.configureComponent(wagon, config, container.getContainerRealm());
    }

    static class WagonComponentConfigurator extends AbstractComponentConfigurator {

        @Override
        public void configureComponent(
                Object component,
                PlexusConfiguration configuration,
                ExpressionEvaluator expressionEvaluator,
                ClassRealm containerRealm,
                ConfigurationListener listener)
                throws ComponentConfigurationException {
            ObjectWithFieldsConverter converter = new ObjectWithFieldsConverter();

            converter.processConfiguration(
                    converterLookup, component, containerRealm, configuration, expressionEvaluator, listener);
        }
    }
}
