require 'puppet/indirector/terminus'
require 'puppet/util/yaml'

# The base class for YAML indirection termini.
class Puppet::Indirector::Yaml < Puppet::Indirector::Terminus
  # Read a given name's file in and convert it from YAML.
  def find(request)
    file = path(request.key)
    return nil unless Puppet::FileSystem.exist?(file)

    begin
      return load_file(file)
    rescue Puppet::Util::Yaml::YamlLoadError => detail
      raise Puppet::Error, _("Could not parse YAML data for %{indirection} %{request}: %{detail}") % { indirection: indirection.name, request: request.key, detail: detail }, detail.backtrace
    end
  end

  # Convert our object to YAML and store it to the disk.
  def save(request)
    raise ArgumentError.new(_("You can only save objects that respond to :name")) unless request.instance.respond_to?(:name)

    file = path(request.key)

    basedir = File.dirname(file)

    # This is quite likely a bad idea, since we're not managing ownership or modes.
    Dir.mkdir(basedir) unless Puppet::FileSystem.exist?(basedir)

    begin
      Puppet::Util::Yaml.dump(request.instance, file)
    rescue TypeError => detail
      Puppet.err _("Could not save %{indirection} %{request}: %{detail}") % { indirection: self.name, request: request.key, detail: detail }
    end
  end

  # Return the path to a given node's file.
  def path(name,ext='.yaml')
    if name =~ Puppet::Indirector::BadNameRegexp then
      Puppet.crit(_("directory traversal detected in %{indirection}: %{name}") % { indirection: self.class, name: name.inspect })
      raise ArgumentError, _("invalid key")
    end

    base = Puppet.run_mode.server? ? Puppet[:yamldir] : Puppet[:clientyamldir]
    File.join(base, self.class.indirection_name.to_s, name.to_s + ext)
  end

  def destroy(request)
    file_path = path(request.key)
    Puppet::FileSystem.unlink(file_path) if Puppet::FileSystem.exist?(file_path)
  end

  def search(request)
    Dir.glob(path(request.key,'')).collect do |file|
      load_file(file)
    end
  end

  protected

  def load_file(file)
    Puppet::Util::Yaml.safe_load_file(file, [model, Symbol])
  end
end