/*
    * 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.artifact;
  
  import java.io.File;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  /**
   * A simple artifact. <em>Note:</em> Instances of this class are immutable and the exposed mutators return new objects
   * rather than changing the current instance.
   */
  public final class DefaultArtifact extends AbstractArtifact {
      private static final Pattern COORDINATE_PATTERN =
              Pattern.compile("([^: ]+):([^: ]+)(:([^: ]*)(:([^: ]+))?)?:([^: ]+)");
  
      private final String groupId;
  
      private final String artifactId;
  
      private final String version;
  
      private final String classifier;
  
      private final String extension;
  
      private final File file;
  
      private final Map<String, String> properties;
  
      /**
       * Creates a new artifact with the specified coordinates. If not specified in the artifact coordinates, the
       * artifact's extension defaults to {@code jar} and classifier to an empty string.
       *
       * @param coords The artifact coordinates in the format
       *            {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>}, must not be {@code null}.
       *
       * @throws IllegalArgumentException If the artifact coordinates found in {@code coords} do not match the expected
       * format.
       */
      public DefaultArtifact(String coords) {
          this(coords, null, null);
      }
  
      /**
       * Creates a new artifact with the specified coordinates and properties. If not specified in the artifact
       * coordinates, the artifact's extension defaults to {@code jar} and classifier to an empty string.
       *
       * @param coords The artifact coordinates in the format
       *            {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>}, must not be {@code null}.
       * @param properties The artifact properties, may be {@code null}.
       *
       * @throws IllegalArgumentException If the artifact coordinates found in {@code coords} do not match the expected
       * format.
       */
      public DefaultArtifact(String coords, Map<String, String> properties) {
          this(coords, properties, null);
      }
  
      /**
       * Creates a new artifact with the specified coordinates and type. If not specified in the artifact coordinates,
       * the artifact's extension defaults to type extension (or "jar" if type is {@code null}) and
       * classifier to type extension (or "" if type is {@code null}).
       *
       * @param coords The artifact coordinates in the format
       *            {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>}, must not be {@code null}.
       * @param type The artifact type, may be {@code null}.
       *
       * @throws IllegalArgumentException If the artifact coordinates found in {@code coords} do not match the expected
       * format.
       */
      public DefaultArtifact(String coords, ArtifactType type) {
          this(coords, null, type);
      }
  
      /**
       * Creates a new artifact with the specified coordinates, properties and type. If not specified in the artifact
       * coordinates, the artifact's extension defaults to type extension (or "jar" if type is {@code null}) and
       * classifier to type extension (or "" if type is {@code null}).
       *
      * @param coords The artifact coordinates in the format
      *            {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>}, must not be {@code null}.
      * @param properties The artifact properties, may be {@code null}.
      * @param type The artifact type, may be {@code null}.
      *
      * @throws IllegalArgumentException If the artifact coordinates found in {@code coords} do not match the expected
      * format.
      */
     public DefaultArtifact(String coords, Map<String, String> properties, ArtifactType type) {
         Matcher m = COORDINATE_PATTERN.matcher(coords);
         if (!m.matches()) {
             throw new IllegalArgumentException("Bad artifact coordinates " + coords
                     + ", expected format is <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>");
         }
         groupId = m.group(1);
         artifactId = m.group(2);
         extension = get(m.group(4), type == null ? "jar" : type.getExtension());
         classifier = get(m.group(6), type == null ? "" : type.getClassifier());
         this.version = emptify(m.group(7));
         this.file = null;
         this.properties = merge(properties, (type != null) ? type.getProperties() : null);
     }
 
     private static String get(String value, String defaultValue) {
         return (value == null || value.isEmpty()) ? defaultValue : value;
     }
 
     /**
      * Creates a new artifact with the specified coordinates and no classifier. Passing {@code null} for any of the
      * coordinates is equivalent to specifying an empty string.
      *
      * @param groupId The group identifier of the artifact, may be {@code null}.
      * @param artifactId The artifact identifier of the artifact, may be {@code null}.
      * @param extension The file extension of the artifact, may be {@code null}.
      * @param version The version of the artifact, may be {@code null}.
      */
     public DefaultArtifact(String groupId, String artifactId, String extension, String version) {
         this(groupId, artifactId, "", extension, version);
     }
 
     /**
      * Creates a new artifact with the specified coordinates. Passing {@code null} for any of the coordinates is
      * equivalent to specifying an empty string.
      *
      * @param groupId The group identifier of the artifact, may be {@code null}.
      * @param artifactId The artifact identifier of the artifact, may be {@code null}.
      * @param classifier The classifier of the artifact, may be {@code null}.
      * @param extension The file extension of the artifact, may be {@code null}.
      * @param version The version of the artifact, may be {@code null}.
      */
     public DefaultArtifact(String groupId, String artifactId, String classifier, String extension, String version) {
         this(groupId, artifactId, classifier, extension, version, null, (File) null);
     }
 
     /**
      * Creates a new artifact with the specified coordinates. Passing {@code null} for any of the coordinates is
      * equivalent to specifying an empty string. The optional artifact type provided to this constructor will be used to
      * determine the artifact's classifier and file extension if the corresponding arguments for this constructor are
      * {@code null}.
      *
      * @param groupId The group identifier of the artifact, may be {@code null}.
      * @param artifactId The artifact identifier of the artifact, may be {@code null}.
      * @param classifier The classifier of the artifact, may be {@code null}.
      * @param extension The file extension of the artifact, may be {@code null}.
      * @param version The version of the artifact, may be {@code null}.
      * @param type The artifact type from which to query classifier, file extension and properties, may be {@code null}.
      */
     public DefaultArtifact(
             String groupId, String artifactId, String classifier, String extension, String version, ArtifactType type) {
         this(groupId, artifactId, classifier, extension, version, null, type);
     }
 
     /**
      * Creates a new artifact with the specified coordinates and properties. Passing {@code null} for any of the
      * coordinates is equivalent to specifying an empty string. The optional artifact type provided to this constructor
      * will be used to determine the artifact's classifier and file extension if the corresponding arguments for this
      * constructor are {@code null}. If the artifact type specifies properties, those will get merged with the
      * properties passed directly into the constructor, with the latter properties taking precedence.
      *
      * @param groupId The group identifier of the artifact, may be {@code null}.
      * @param artifactId The artifact identifier of the artifact, may be {@code null}.
      * @param classifier The classifier of the artifact, may be {@code null}.
      * @param extension The file extension of the artifact, may be {@code null}.
      * @param version The version of the artifact, may be {@code null}.
      * @param properties The properties of the artifact, may be {@code null} if none.
      * @param type The artifact type from which to query classifier, file extension and properties, may be {@code null}.
      */
     public DefaultArtifact(
             String groupId,
             String artifactId,
             String classifier,
             String extension,
             String version,
             Map<String, String> properties,
             ArtifactType type) {
         this.groupId = emptify(groupId);
         this.artifactId = emptify(artifactId);
         if (classifier != null || type == null) {
             this.classifier = emptify(classifier);
         } else {
             this.classifier = emptify(type.getClassifier());
         }
         if (extension != null || type == null) {
             this.extension = emptify(extension);
         } else {
             this.extension = emptify(type.getExtension());
         }
         this.version = emptify(version);
         this.file = null;
         this.properties = merge(properties, (type != null) ? type.getProperties() : null);
     }
 
     private static Map<String, String> merge(Map<String, String> dominant, Map<String, String> recessive) {
         Map<String, String> properties;
 
         if ((dominant == null || dominant.isEmpty()) && (recessive == null || recessive.isEmpty())) {
             properties = Collections.emptyMap();
         } else {
             properties = new HashMap<>();
             if (recessive != null) {
                 properties.putAll(recessive);
             }
             if (dominant != null) {
                 properties.putAll(dominant);
             }
             properties = Collections.unmodifiableMap(properties);
         }
 
         return properties;
     }
 
     /**
      * Creates a new artifact with the specified coordinates, properties and file. Passing {@code null} for any of the
      * coordinates is equivalent to specifying an empty string.
      *
      * @param groupId The group identifier of the artifact, may be {@code null}.
      * @param artifactId The artifact identifier of the artifact, may be {@code null}.
      * @param classifier The classifier of the artifact, may be {@code null}.
      * @param extension The file extension of the artifact, may be {@code null}.
      * @param version The version of the artifact, may be {@code null}.
      * @param properties The properties of the artifact, may be {@code null} if none.
      * @param file The resolved file of the artifact, may be {@code null}.
      */
     public DefaultArtifact(
             String groupId,
             String artifactId,
             String classifier,
             String extension,
             String version,
             Map<String, String> properties,
             File file) {
         this.groupId = emptify(groupId);
         this.artifactId = emptify(artifactId);
         this.classifier = emptify(classifier);
         this.extension = emptify(extension);
         this.version = emptify(version);
         this.file = file;
         this.properties = copyProperties(properties);
     }
 
     DefaultArtifact(
             String groupId,
             String artifactId,
             String classifier,
             String extension,
             String version,
             File file,
             Map<String, String> properties) {
         // NOTE: This constructor assumes immutability of the provided properties, for internal use only
         this.groupId = emptify(groupId);
         this.artifactId = emptify(artifactId);
         this.classifier = emptify(classifier);
         this.extension = emptify(extension);
         this.version = emptify(version);
         this.file = file;
         this.properties = properties;
     }
 
     private static String emptify(String str) {
         return (str == null) ? "" : str;
     }
 
     public String getGroupId() {
         return groupId;
     }
 
     public String getArtifactId() {
         return artifactId;
     }
 
     public String getVersion() {
         return version;
     }
 
     public String getClassifier() {
         return classifier;
     }
 
     public String getExtension() {
         return extension;
     }
 
     public File getFile() {
         return file;
     }
 
     public Map<String, String> getProperties() {
         return properties;
     }
 }