class Sprockets::SasscProcessor

def call(input)
  context = input[:environment].context_class.new(input)
  options = engine_options(input, context)
  engine = Autoload::SassC::Engine.new(input[:data], options)
  css = Utils.module_include(Autoload::SassC::Script::Functions, @functions) do
    engine.render.sub(/^\n^\/\*# sourceMappingURL=.*\*\/$/m, '')
  end
  begin
    map = SourceMapUtils.format_source_map(JSON.parse(engine.source_map), input)
    map = SourceMapUtils.combine_source_maps(input[:metadata][:map], map)
    engine.dependencies.each do |dependency|
      context.metadata[:dependencies] << URIUtils.build_file_digest_uri(dependency.filename)
    end
  rescue SassC::NotRenderedError
    map = input[:metadata][:map]
  end
  context.metadata.merge(data: css, map: map)
end

def engine_options(input, context)
  merge_options({
    filename: input[:filename],
    syntax: self.class.syntax,
    load_paths: input[:environment].paths,
    importer: @importer_class,
    source_map_contents: false,
    source_map_file: "#{input[:filename]}.map",
    omit_source_map_url: true,
    sprockets: {
      context: context,
      environment: input[:environment],
      dependencies: context.metadata[:dependencies]
    }
  })
end

def initialize(options = {}, &block)
  @cache_version = options[:cache_version]
  @cache_key = "#{self.class.name}:#{VERSION}:#{Autoload::SassC::VERSION}:#{@cache_version}".freeze
  @importer_class = options[:importer]
  @sass_config = options[:sass_config] || {}
  @functions = Module.new do
    include SassProcessor::Functions
    include options[:functions] if options[:functions]
    class_eval(&block) if block_given?
  end
end