/*
 * 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.impl.checksum;

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

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactory;
import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactorySelector;

import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.toList;

/**
 * Default implementation.
 *
 * @since 1.8.0
 */
@Singleton
@Named
public class DefaultChecksumAlgorithmFactorySelector implements ChecksumAlgorithmFactorySelector {
    private final Map<String, ChecksumAlgorithmFactory> factories;

    @Inject
    public DefaultChecksumAlgorithmFactorySelector(Map<String, ChecksumAlgorithmFactory> factories) {
        this.factories = requireNonNull(factories);
    }

    @Override
    public ChecksumAlgorithmFactory select(String algorithmName) {
        requireNonNull(algorithmName, "algorithmMame must not be null");
        ChecksumAlgorithmFactory factory = factories.get(algorithmName);
        if (factory == null) {
            throw new IllegalArgumentException(String.format(
                    "Unsupported checksum algorithm %s, supported ones are %s",
                    algorithmName,
                    getChecksumAlgorithmFactories().stream()
                            .map(ChecksumAlgorithmFactory::getName)
                            .collect(toList())));
        }
        return factory;
    }

    @Override
    public List<ChecksumAlgorithmFactory> selectList(Collection<String> algorithmNames) {
        return algorithmNames.stream().map(this::select).collect(toList());
    }

    @Override
    public Collection<ChecksumAlgorithmFactory> getChecksumAlgorithmFactories() {
        return Collections.unmodifiableCollection(factories.values());
    }

    @Override
    public boolean isChecksumExtension(String extension) {
        requireNonNull(extension);
        if (extension.contains(".")) {
            return factories.values().stream().anyMatch(a -> extension.endsWith("." + a.getFileExtension()));
        } else {
            return factories.values().stream().anyMatch(a -> extension.equals(a.getFileExtension()));
        }
    }
}
