module Signore class Signature < Struct.new :text, :author, :source, :subject, :tags

  def tagged_with? tag
    tags and tags.include? tag
  end

  def to_s
    wrapped = LovelyRufus::Wrapper.new(text.gsub("\n", "\n\n")).wrapped(80).gsub("\n\n", "\n")
    wrapped + meta_for(wrapped)
  end

  private

  def meta
    case
    when author && subject && source then "#{author} #{subject}, #{source}"
    when author && subject           then "#{author} #{subject}"
    when author && source            then "#{author}, #{source}"
    when author                      then "#{author}"
    when source                      then "#{source}"
    when subject                     then "#{subject}"
    end
  end

  def meta_for wrapped
    return '' unless meta

    indent = wrapped.split("\n").map(&:size).max - meta.size - 2
    spaces = indent > 0 ? ' ' * indent : ''

    "\n#{spaces}[#{meta}]"
  end

end end