/*
    * 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.buildcache.xml;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.UnknownHostException;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Date;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.stream.Collectors;
  
  import org.apache.maven.buildcache.CacheUtils;
  import org.apache.maven.buildcache.checksum.MavenProjectInput;
  import org.apache.maven.buildcache.hash.HashAlgorithm;
  import org.apache.maven.buildcache.xml.build.Artifact;
  import org.apache.maven.buildcache.xml.build.CompletedExecution;
  import org.apache.maven.buildcache.xml.build.DigestItem;
  import org.apache.maven.buildcache.xml.build.ProjectsInputInfo;
  import org.apache.maven.model.Dependency;
  import org.apache.maven.plugin.MojoExecution;
  
  import static org.apache.maven.buildcache.CacheUtils.mojoExecutionKey;
  
  /**
   * Build
   */
  public class Build {
  
      final org.apache.maven.buildcache.xml.build.Build dto;
      CacheSource source;
      volatile Map<String, CompletedExecution> execMap;
  
      public Build(
              List<String> goals,
              Artifact artifact,
              List<Artifact> attachedArtifacts,
              ProjectsInputInfo projectsInputInfo,
              List<CompletedExecution> completedExecutions,
              String hashAlgorithm) {
          this.dto = new org.apache.maven.buildcache.xml.build.Build();
          this.dto.setCacheImplementationVersion(MavenProjectInput.CACHE_IMPLEMENTATION_VERSION);
          this.dto.setBuildTime(new Date());
          try {
              this.dto.setBuildServer(InetAddress.getLocalHost().getCanonicalHostName());
          } catch (UnknownHostException ignore) {
              this.dto.setBuildServer("unknown");
          }
          this.dto.setHashFunction(hashAlgorithm);
          this.dto.setArtifact(artifact);
          this.dto.setGoals(goals);
          this.dto.setAttachedArtifacts(attachedArtifacts);
          this.dto.setExecutions(completedExecutions);
          this.dto.setProjectsInputInfo(projectsInputInfo);
          this.source = CacheSource.BUILD;
      }
  
      public CacheSource getSource() {
          return source;
      }
  
      public Build(org.apache.maven.buildcache.xml.build.Build dto, CacheSource source) {
          this.dto = dto;
          this.source = source;
      }
  
      public static List<Artifact> createAttachedArtifacts(
              List<org.apache.maven.artifact.Artifact> artifacts, HashAlgorithm algorithm) throws IOException {
          List<Artifact> attachedArtifacts = new ArrayList<>();
          for (org.apache.maven.artifact.Artifact artifact : artifacts) {
              final Artifact dto = DtoUtils.createDto(artifact);
              if (artifact.getFile() != null) {
                  dto.setFileHash(algorithm.hash(artifact.getFile().toPath()));
              }
              attachedArtifacts.add(dto);
          }
          return attachedArtifacts;
      }
  
      public List<MojoExecution> getMissingExecutions(List<MojoExecution> mojos) {
         return mojos.stream()
                 .filter(mojo -> !hasCompletedExecution(mojoExecutionKey(mojo)))
                 .collect(Collectors.toList());
     }
 
     private boolean hasCompletedExecution(String mojoExecutionKey) {
         return getExecutionMap().containsKey(mojoExecutionKey);
     }
 
     @Override
     public String toString() {
         return "Build{" + "dto=" + dto + '}';
     }
 
     public CompletedExecution findMojoExecutionInfo(MojoExecution mojoExecution) {
         return getExecutionMap().get(mojoExecutionKey(mojoExecution));
     }
 
     public String getCacheImplementationVersion() {
         return dto.getCacheImplementationVersion();
     }
 
     public Artifact getArtifact() {
         return dto.getArtifact();
     }
 
     public List<Artifact> getAttachedArtifacts() {
         if (dto.getAttachedArtifacts() != null) {
             return dto.getAttachedArtifacts();
         }
         return Collections.emptyList();
     }
 
     public org.apache.maven.buildcache.xml.build.Build getDto() {
         return dto;
     }
 
     public String getHighestCompletedGoal() {
         return CacheUtils.getLast(dto.getGoals());
     }
 
     public DigestItem findArtifact(Dependency dependency) {
         if (CacheUtils.isPom(dependency)) {
             throw new IllegalArgumentException("Pom dependencies should not be treated as artifacts: " + dependency);
         }
         List<Artifact> artifacts = new ArrayList<>(getAttachedArtifacts());
         artifacts.add(getArtifact());
         for (Artifact artifact : artifacts) {
             if (isEquals(dependency, artifact)) {
                 return DtoUtils.createdDigestedByProjectChecksum(
                         artifact, dto.getProjectsInputInfo().getChecksum());
             }
         }
         return null;
     }
 
     private boolean isEquals(Dependency dependency, Artifact artifact) {
         return Objects.equals(dependency.getGroupId(), artifact.getGroupId())
                 && Objects.equals(dependency.getArtifactId(), artifact.getArtifactId())
                 && Objects.equals(dependency.getType(), artifact.getType())
                 && Objects.equals(dependency.getClassifier(), artifact.getClassifier());
     }
 
     private Map<String, CompletedExecution> getExecutionMap() {
         if (execMap != null) {
             return execMap;
         }
         List<CompletedExecution> executionsList = dto.getExecutions();
         if (executionsList == null || executionsList.isEmpty()) {
             execMap = Collections.emptyMap();
             return execMap;
         }
         execMap = executionsList.stream()
                 .collect(Collectors.toMap(CompletedExecution::getExecutionKey, v -> v, (oldV, newV) -> oldV));
         return execMap;
     }
 }