class KPM::BaseArtifact

def artifact_info(logger, coordinate_map, overrides={}, ssl_verify=true)
  info = {
      :skipped => false
  }
  coordinates = KPM::Coordinates.build_coordinates(coordinate_map)
  begin
    nexus_info = nexus_remote(overrides, ssl_verify).get_artifact_info(coordinates)
  rescue NexusCli::ArtifactMalformedException => e
    raise NexusCli::NexusCliError.new("Invalid coordinates #{coordinate_map}")
  rescue NexusCli::NexusCliError => e
    logger.warn("Unable to retrieve coordinates #{coordinate_map}")
    raise e
  end
  xml = REXML::Document.new(nexus_info)
  info[:sha1] = xml.elements['//sha1'].text unless xml.elements['//sha1'].nil?
  info[:version] = xml.elements['//version'].text unless xml.elements['//version'].nil?
  info[:repository_path] = xml.elements['//repositoryPath'].text unless xml.elements['//repositoryPath'].nil?
  info[:is_tgz] = info[:repository_path].end_with?('.tar.gz') || info[:repository_path].end_with?('.tgz')
  info
end

def nexus_defaults
  {
      url:        'https://oss.sonatype.org',
      repository: 'releases'
  }
end

def nexus_remote(overrides={}, ssl_verify=true)
  nexus_remote ||= NexusCli::RemoteFactory.create(nexus_defaults.merge(overrides || {}), ssl_verify)
end

def path_looks_like_a_directory(path)
  # It already is!
  return true if File.directory?(path)
  # It already isn't!
  return false if File.file?(path)
  last_part = File.basename(path).downcase
  %w(.pom .xml .war .jar .xsd .tar.gz .tgz .gz .zip).each do |classic_file_extension|
    return false if last_part.end_with?(classic_file_extension)
  end
  # Known magic files
  %w(root).each do |classic_filename|
    return false if last_part == classic_filename
  end
  # Probably a directory
  true
end

def populate_fs_info(info, destination_path)
  destination_path = update_destination_path(info, destination_path)
  if path_looks_like_a_directory(destination_path) && !info[:is_tgz]
    info[:dir_name] = File.expand_path(destination_path)
    info[:file_name] = File.basename(info[:repository_path])
    info[:file_path] = File.expand_path(File.join(info[:dir_name], File.basename(info[:repository_path])))
  else
    # The destination was a fully specified path or this is an archive and we keep the directory
    if info[:is_tgz]
      info[:dir_name] = File.expand_path(destination_path)
    else
      info[:dir_name] = File.dirname(destination_path)
      info[:file_name] = File.basename(destination_path)
    end
    info[:file_path] = File.expand_path(destination_path)
  end
  destination_path
end

def pull(logger, group_id, artifact_id, packaging='jar', classifier=nil, version='LATEST', destination_path=nil, sha1_file=nil, force_download=false, verify_sha1=true, overrides={}, ssl_verify=true)
  coordinate_map = {:group_id => group_id, :artifact_id => artifact_id, :packaging => packaging, :classifier => classifier, :version => version}
  pull_and_put_in_place(logger, coordinate_map, nil, destination_path, false, sha1_file, force_download, verify_sha1, overrides, ssl_verify)
end

def pull_and_put_in_place(logger, coordinate_map, plugin_name, destination_path=nil, skip_top_dir=true, sha1_file=nil, force_download=false, verify_sha1=true, overrides={}, ssl_verify=true)
  # Build artifact info
  artifact_info = artifact_info(logger, coordinate_map, overrides, ssl_verify)
  artifact_info[:plugin_name] = plugin_name
  populate_fs_info(artifact_info, destination_path)
  # Update with resolved version in case 'LATEST' was passed
  coordinate_map[:version] = artifact_info[:version]
  coordinates = KPM::Coordinates.build_coordinates(coordinate_map)
  # Return early if there's nothing to do
  if !force_download && skip_if_exists(artifact_info, coordinates, sha1_file)
    logger.info "  Skipping installation of #{coordinates} to #{artifact_info[:file_path]}, file already exists"
    # We need to do a bit of magic to make sure that artifact_info[:bundle_dir] is correctly populated when we bail early
    if artifact_info[:is_tgz] && coordinate_map[:artifact_id] != 'killbill-platform-osgi-bundles-defaultbundles'
      plugin_dir = File.split(artifact_info[:dir_name])[0]
      plugin_name = artifact_info[:plugin_name]
      unless plugin_name
        plugins_manager = PluginsManager.new(plugin_dir, logger)
        artifact_id = coordinates.split(':')[1]
        plugin_name = plugins_manager.guess_plugin_name(artifact_id)
      end
      if plugin_name.nil?
        logger.warn("Failed to guess plugin_name for #{coordinates}: artifact_info[:bundle_dir] will not be populated correctly")
      else
        version = artifact_info[:version]
        artifact_info[:bundle_dir] = Pathname.new(artifact_info[:dir_name]).join(plugin_name).join(version).to_s
      end
    else
      artifact_info[:bundle_dir] = artifact_info[:dir_name]
    end
    artifact_info[:skipped] = true
    return artifact_info
  end
  # Create the destination directory
  FileUtils.mkdir_p(artifact_info[:dir_name])
  # Download the artifact in a temporary directory in case of failures
  Dir.mktmpdir do |tmp_destination_dir|
    logger.info "      Starting download of #{coordinates} to #{tmp_destination_dir}"
    downloaded_artifact_info = pull_and_verify(logger, artifact_info[:sha1], coordinates, tmp_destination_dir, sha1_file, verify_sha1, overrides, ssl_verify)
    if artifact_info[:is_tgz]
      artifact_info[:bundle_dir] = Utils.unpack_tgz(downloaded_artifact_info[:file_path], artifact_info[:dir_name], skip_top_dir)
      FileUtils.rm downloaded_artifact_info[:file_path]
    else
      FileUtils.mv downloaded_artifact_info[:file_path], artifact_info[:file_path]
      artifact_info[:bundle_dir] = artifact_info[:dir_name]
      artifact_info[:size] = downloaded_artifact_info[:size]
    end
    logger.info "Successful installation of #{coordinates} to #{artifact_info[:bundle_dir]}"
  end
  artifact_info
end

def pull_and_verify(logger, remote_sha1, coordinates, destination_dir, sha1_file, verify_sha1, overrides={}, ssl_verify=true)
  info = nexus_remote(overrides, ssl_verify).pull_artifact(coordinates, destination_dir)
  # Always verify sha1 and if incorrect either throw or log when we are asked to bypass sha1 verification
  verified = verify(logger, coordinates, info[:file_path], remote_sha1)
  if !verified
    raise ArtifactCorruptedException if verify_sha1
    logger.warn("Skip sha1 verification for  #{coordinates}")
  end
  if sha1_file
    sha1_checker = Sha1Checker.from_file(sha1_file)
    sha1_checker.add_or_modify_entry!(coordinates, remote_sha1)
  end
  info
end

def pull_from_fs(logger, file_path, destination_path=nil)
  pull_from_fs_and_put_in_place(logger, file_path, destination_path)
end

def pull_from_fs_and_put_in_place(logger, file_path, destination_path=nil)
  artifact_info = {
      :skipped => false,
      :repository_path => file_path,
      :is_tgz => file_path.end_with?('.tar.gz') || file_path.end_with?('.tgz')
  }
  populate_fs_info(artifact_info, destination_path)
  # Create the destination directory
  FileUtils.mkdir_p(artifact_info[:dir_name])
  if artifact_info[:is_tgz]
    artifact_info[:bundle_dir] = Utils.unpack_tgz(file_path, artifact_info[:dir_name], true)
  else
    FileUtils.cp file_path, artifact_info[:dir_name]
    artifact_info[:bundle_dir] = artifact_info[:dir_name]
  end
  logger.info "Successful installation of #{file_path} to #{artifact_info[:bundle_dir]}"
  artifact_info
end

def skip_if_exists(artifact_info, coordinates, sha1_file)
  # If there is no sha1 from the binary server, we don't skip
  # (Unclear if this is even possible)
  return false if artifact_info[:sha1].nil?
  # If there is no such sha1_file, we don't skip
  return false if sha1_file.nil? || !File.exists?(sha1_file)
  #
  # At this point we have a valid sha1_file and a remote sha1
  #
  sha1_checker = Sha1Checker.from_file(sha1_file)
  local_sha1 = sha1_checker.sha1(coordinates)
  # Support convenient 'SKIP' keyword for allowing hacking deployments (dev mode)
  return true if local_sha1 == 'SKIP'
  if artifact_info[:is_tgz]
    # For Ruby plugins, if there is an entry in the sha1_file and it matches the remote, we can skip
    local_sha1 == artifact_info[:sha1]
  else
    # For Java plugins and other artifacts, verify the file is still around
    local_sha1 == artifact_info[:sha1] && File.file?(artifact_info[:file_path])
  end
end

def update_destination_path(info, destination_path)
  # In case LATEST was specified, use the actual version as the directory name
  destination_path = KPM::root if destination_path.nil?
  plugin_dir, version_dir = File.split(destination_path)
  destination_path = Pathname.new(plugin_dir).join(info[:version]).to_s if version_dir == 'LATEST' && !info[:version].nil?
  destination_path
end

def verify(logger, coordinates, file_path, remote_sha1)
  # Can't check :(
  if remote_sha1.nil?
    logger.warn("Unable to verify sha1 for #{coordinates}")
    return true
  end
  local_sha1 = Digest::SHA1.file(file_path).hexdigest
  res = local_sha1 == remote_sha1
  if !res
    logger.warn("Sha1 verification failed for #{coordinates} : local_sha1 = #{local_sha1}, remote_sha1 = #{remote_sha1}")
  end
  res
end