/*
    * 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;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.util.*;
  import java.util.stream.Collectors;
  
  import org.eclipse.aether.ConfigurationProperties;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.spi.artifact.ArtifactPredicate;
  import org.eclipse.aether.spi.artifact.ArtifactPredicateFactory;
  import org.eclipse.aether.spi.connector.checksum.ChecksumAlgorithmFactorySelector;
  import org.eclipse.aether.util.ConfigUtils;
  
  @Singleton
  @Named
  public final class DefaultArtifactPredicateFactory implements ArtifactPredicateFactory {
      private static final String CONFIG_PROPS_PREFIX = ConfigurationProperties.PREFIX_CHECKSUMS;
  
      /**
       * Comma-separated list of extensions with leading dot (example ".asc") that should have checksums omitted.
       * These are applied to sub-artifacts only. Note: to achieve 1.7.x aether.checksums.forSignature=true behaviour,
       * pass empty string as value for this property.
       *
       * @configurationSource {@link RepositorySystemSession#getConfigProperties()}
       * @configurationType {@link java.lang.String}
       * @configurationDefaultValue {@link #DEFAULT_OMIT_CHECKSUMS_FOR_EXTENSIONS}
       * @configurationRepoIdSuffix No
       */
      public static final String CONFIG_PROP_OMIT_CHECKSUMS_FOR_EXTENSIONS =
              CONFIG_PROPS_PREFIX + "omitChecksumsForExtensions";
  
      public static final String DEFAULT_OMIT_CHECKSUMS_FOR_EXTENSIONS = ".asc,.sigstore";
  
      private final ChecksumAlgorithmFactorySelector checksumAlgorithmFactorySelector;
  
      @Inject
      public DefaultArtifactPredicateFactory(ChecksumAlgorithmFactorySelector checksumAlgorithmFactorySelector) {
          this.checksumAlgorithmFactorySelector = checksumAlgorithmFactorySelector;
      }
  
      @Override
      public ArtifactPredicate newInstance(RepositorySystemSession session) {
          // ensure uniqueness of (potentially user set) extension list
          Set<String> omitChecksumsForExtensions = Arrays.stream(ConfigUtils.getString(
                                  session,
                                  DEFAULT_OMIT_CHECKSUMS_FOR_EXTENSIONS,
                                  CONFIG_PROP_OMIT_CHECKSUMS_FOR_EXTENSIONS)
                          .split(","))
                  .filter(s -> s != null && !s.trim().isEmpty())
                  .collect(Collectors.toSet());
  
          // validation: enforce that all strings in this set are having leading dot
          if (omitChecksumsForExtensions.stream().anyMatch(s -> !s.startsWith("."))) {
              throw new IllegalArgumentException(String.format(
                      "The configuration %s contains illegal values: %s (all entries must start with '.' (dot))",
                      CONFIG_PROP_OMIT_CHECKSUMS_FOR_EXTENSIONS, omitChecksumsForExtensions));
          }
          return new DefaultArtifactPredicate(checksumAlgorithmFactorySelector, omitChecksumsForExtensions);
      }
  }