/*
    * 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.apache.maven.repository.internal;
  
  import java.io.File;
  import java.text.DateFormat;
  import java.text.SimpleDateFormat;
  import java.util.ArrayList;
  import java.util.Date;
  import java.util.GregorianCalendar;
  import java.util.LinkedHashMap;
  import java.util.Map;
  import java.util.TimeZone;
  
  import org.apache.maven.artifact.repository.metadata.Metadata;
  import org.apache.maven.artifact.repository.metadata.Snapshot;
  import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
  import org.apache.maven.artifact.repository.metadata.Versioning;
  import org.eclipse.aether.artifact.Artifact;
  
  /**
   * Maven remote GAV level metadata.
   */
  final class RemoteSnapshotMetadata extends MavenSnapshotMetadata {
      public static final String DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT = "yyyyMMdd.HHmmss";
  
      public static final TimeZone DEFAULT_SNAPSHOT_TIME_ZONE = TimeZone.getTimeZone("Etc/UTC");
  
      private final Map<String, SnapshotVersion> versions = new LinkedHashMap<>();
  
      private final Integer buildNumber;
  
      RemoteSnapshotMetadata(Artifact artifact, boolean legacyFormat, Date timestamp, Integer buildNumber) {
          super(createRepositoryMetadata(artifact, legacyFormat), null, legacyFormat, timestamp);
          this.buildNumber = buildNumber;
      }
  
      private RemoteSnapshotMetadata(
              Metadata metadata, File file, boolean legacyFormat, Date timestamp, Integer buildNumber) {
          super(metadata, file, legacyFormat, timestamp);
          this.buildNumber = buildNumber;
      }
  
      @Override
      public MavenMetadata setFile(File file) {
          return new RemoteSnapshotMetadata(metadata, file, legacyFormat, timestamp, buildNumber);
      }
  
      public String getExpandedVersion(Artifact artifact) {
          String key = getKey(artifact.getClassifier(), artifact.getExtension());
          return versions.get(key).getVersion();
      }
  
      @Override
      protected void merge(Metadata recessive) {
          Snapshot snapshot;
          String lastUpdated;
  
          if (metadata.getVersioning() == null) {
              DateFormat utcDateFormatter = new SimpleDateFormat(DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT);
              utcDateFormatter.setCalendar(new GregorianCalendar());
              utcDateFormatter.setTimeZone(DEFAULT_SNAPSHOT_TIME_ZONE);
  
              snapshot = new Snapshot();
              snapshot.setBuildNumber(buildNumber != null ? buildNumber : getBuildNumber(recessive) + 1);
              snapshot.setTimestamp(utcDateFormatter.format(timestamp));
  
              Versioning versioning = new Versioning();
              versioning.setSnapshot(snapshot);
              versioning.setLastUpdatedTimestamp(timestamp);
              lastUpdated = versioning.getLastUpdated();
  
              metadata.setVersioning(versioning);
          } else {
              snapshot = metadata.getVersioning().getSnapshot();
              lastUpdated = metadata.getVersioning().getLastUpdated();
          }
  
          for (Artifact artifact : artifacts) {
              String version = artifact.getVersion();
  
              if (version.endsWith(SNAPSHOT)) {
                  String qualifier = snapshot.getTimestamp() + '-' + snapshot.getBuildNumber();
                 version = version.substring(0, version.length() - SNAPSHOT.length()) + qualifier;
             }
 
             SnapshotVersion sv = new SnapshotVersion();
             sv.setClassifier(artifact.getClassifier());
             sv.setExtension(artifact.getExtension());
             sv.setVersion(version);
             sv.setUpdated(lastUpdated);
 
             versions.put(getKey(sv.getClassifier(), sv.getExtension()), sv);
         }
 
         artifacts.clear();
 
         Versioning versioning = recessive.getVersioning();
         if (versioning != null) {
             for (SnapshotVersion sv : versioning.getSnapshotVersions()) {
                 String key = getKey(sv.getClassifier(), sv.getExtension());
                 if (!versions.containsKey(key)) {
                     versions.put(key, sv);
                 }
             }
         }
 
         if (!legacyFormat) {
             metadata.getVersioning().setSnapshotVersions(new ArrayList<>(versions.values()));
         }
         // just carry-on as-is
         if (!recessive.getPlugins().isEmpty()) {
             metadata.setPlugins(new ArrayList<>(recessive.getPlugins()));
         }
     }
 
     private static int getBuildNumber(Metadata metadata) {
         int number = 0;
 
         Versioning versioning = metadata.getVersioning();
         if (versioning != null) {
             Snapshot snapshot = versioning.getSnapshot();
             if (snapshot != null && snapshot.getBuildNumber() > 0) {
                 number = snapshot.getBuildNumber();
             }
         }
 
         return number;
     }
 }