module NexusCli::N3Metadata

def convert_result_to_hash(custom_metadata)
  request = {}
  document = REXML::Document.new(custom_metadata)
  REXML::XPath.each(document, "//customMetadataResponse/data/customMetadata[namespace=\"urn:nexus/user#\"]") do |row|
    request[row.elements["key"].text.strip] = row.elements["value"].text.strip
  end
  request
end

def convert_result_to_simple_xml(custom_metadata)
  request = []
  document = REXML::Document.new(custom_metadata)
  REXML::XPath.each(document, "//customMetadataResponse/data/customMetadata[namespace=\"urn:nexus/user#\"]") do |row|
    request.push(create_tag(row.elements["key"].text.strip, row.elements["value"].text.strip))
  end
  formatter = REXML::Formatters::Pretty.new(4)
  formatter.compact = true
  document = REXML::Document.new("<artifact-resolution><data>#{request.join}</data></artifact-resolution>")
  out = ""
  formatter.write(document, out)
  out
end

def create_base64_subject(artifact)
  return Base64.urlsafe_encode64("urn:maven/artifact##{artifact.group_id}:#{artifact.artifact_id}:#{artifact.version}::#{artifact.extension}")
end

def create_metadata_hash(source, target={})
  request = []
  source.merge(target).each do |key, value|
    request.push({:namespace => "urn:nexus/user#", :key => key, :value => value, :readOnly => false}) unless value.empty?
  end
  return request
end

def create_tag(tag, value)
  "<#{tag}>#{value}</#{tag}>"
end

def missing_custom_metadata?(custom_metadata)
  return !custom_metadata.match(/<data[ ]*\/>/).nil? ? true : false
end

def valid_n3_key?(element)
  return !element.nil? && !element.match(/^[a-zA-Z0-9]+$/).nil? ? true : false
end

def valid_n3_search_type?(element)
  return !element.nil? && ["equal", "notequal", "matches", "bounded"].include?(element)
end

def valid_n3_value?(element)
  return !element.nil? && !element.match(/^[^"'\\]*$/).nil? ? true : false
end