class Chef::Knife::Core::ObjectLoader

def file_exists_and_is_readable?(file)
  File.exist?(file) && File.readable?(file)
end

def find_all_object_dirs(path)
  path = File.join(ChefConfig::PathHelper.escape_glob_dir(File.expand_path(path)), "*")
  objects = Dir.glob(path)
  objects.delete_if { |o| !File.directory?(o) }
  objects.map { |o| File.basename(o) }
end

def find_all_objects(path)
  path = File.join(ChefConfig::PathHelper.escape_glob_dir(File.expand_path(path)), "*")
  path << ".{json,rb}"
  objects = Dir.glob(path)
  objects.map { |o| File.basename(o) }
end

def find_file(repo_location, *components)
  if file_exists_and_is_readable?(File.expand_path( components.last ))
    File.expand_path( components.last )
  else
    relative_path = File.join(Dir.pwd, repo_location, *components)
    if file_exists_and_is_readable?(relative_path)
      relative_path
    else
      nil
    end
  end
end

def initialize(klass, ui)
  @klass = klass
  @ui = ui
end

def load_from(repo_location, *components)
  unless object_file = find_file(repo_location, *components)
    ui.error "Could not find or open file '#{components.last}' in current directory or in '#{repo_location}/#{components.join("/")}'"
    exit 1
  end
  object_from_file(object_file)
end

def object_from_file(filename)
  case filename
  when /\.(js|json)$/
    r = FFI_Yajl::Parser.parse(IO.read(filename))
    # Chef::DataBagItem doesn't work well with the json_create method

    if @klass == Chef::DataBagItem
      r
    else
      @klass.from_hash(r)
    end
  when /\.rb$/
    r = klass.new
    r.from_file(filename)
    r
  else
    ui.fatal("File must end in .js, .json, or .rb")
    exit 30
  end
end