require 'puppet/file_serving/mount'

class Puppet::FileServing::Mount::File < Puppet::FileServing::Mount
  def self.localmap
    @localmap ||= {
      "h" => Facter.value("hostname"),
      "H" => [
               Facter.value("hostname"),
               Facter.value("domain")
             ].join("."),
      "d" => Facter.value("domain")
    }
  end

  def complete_path(relative_path, node)
    full_path = path(node)

    raise ArgumentError.new("Mounts without paths are not usable") unless full_path

    # If there's no relative path name, then we're serving the mount itself.
    return full_path unless relative_path

    file = ::File.join(full_path, relative_path)

    if !(Puppet::FileSystem.exist?(file) or Puppet::FileSystem.symlink?(file))
      Puppet.info("File does not exist or is not accessible: #{file}")
      return nil
    end

    file
  end

  # Return an instance of the appropriate class.
  def find(short_file, request)
    complete_path(short_file, request.node)
  end

  # Return the path as appropriate, expanding as necessary.
  def path(node = nil)
    if expandable?
      return expand(@path, node)
    else
      return @path
    end
  end

  # Set the path.
  def path=(path)
    # FIXME: For now, just don't validate paths with replacement
    # patterns in them.
    if path =~ /%./
      # Mark that we're expandable.
      @expandable = true
    else
      raise ArgumentError, "#{path} does not exist or is not a directory" unless FileTest.directory?(path)
      raise ArgumentError, "#{path} is not readable" unless FileTest.readable?(path)
      @expandable = false
    end
    @path = path
  end

  def search(path, request)
    return nil unless path = complete_path(path, request.node)
    [path]
  end

  # Verify our configuration is valid.  This should really check to
  # make sure at least someone will be allowed, but, eh.
  def validate
    raise ArgumentError.new("Mounts without paths are not usable") if @path.nil?
  end

  private

  # Create a map for a specific node.
  def clientmap(node)
    {
      "h" => node.sub(/\..*$/, ""),
      "H" => node,
      "d" => node.sub(/[^.]+\./, "") # domain name
    }
  end

  # Replace % patterns as appropriate.
  def expand(path, node = nil)
    # This map should probably be moved into a method.
    map = nil

    if node
      map = clientmap(node)
    else
      Puppet.notice "No client; expanding '#{path}' with local host"
      # Else, use the local information
      map = localmap
    end

    path.gsub(/%(.)/) do |v|
      key = $1
      if key == "%"
        "%"
      else
        map[key] || v
      end
    end
  end

  # Do we have any patterns in our path, yo?
  def expandable?
    if defined?(@expandable)
      @expandable
    else
      false
    end
  end

  # Cache this manufactured map, since if it's used it's likely
  # to get used a lot.
  def localmap
    self.class.localmap
  end
end