class Sprockets::Base

def [](*args)
  find_asset(*args)
end

def cache=(cache)
  @cache = Cache.new(cache, logger)
end

def cache_get(key)
  cache.get(key)
end

def cache_set(key, value)
  cache.set(key, value)
end

def cached
  raise NotImplementedError
end

def compress_from_root(uri)
  URITar.new(uri, self).compress
end

def each_logical_path(*args, &block)
  return to_enum(__method__, *args) unless block_given?
  filters = args.flatten.map { |arg| Manifest.compile_match_filter(arg) }
  logical_paths.each do |a, b|
    if filters.any? { |f| f.call(a, b) }
      if block.arity == 2
        yield a, b
      else
        yield a
      end
    end
  end
  nil
end

def expand_from_root(uri)
  URITar.new(uri, self).expand
end

def file_digest(path)
  if stat = self.stat(path)
    # Caveat: Digests are cached by the path's current mtime. Its possible
    # for a files contents to have changed and its mtime to have been
    # negligently reset thus appearing as if the file hasn't changed on
    # disk. Also, the mtime is only read to the nearest second. It's
    # also possible the file was updated more than once in a given second.
    key = UnloadedAsset.new(path, self).file_digest_key(stat.mtime.to_i)
    cache.fetch(key) do
      self.stat_digest(path, stat)
    end
  end
end

def find_all_linked_assets(path, options = {})
  return to_enum(__method__, path, options) unless block_given?
  asset = find_asset(path, options)
  return unless asset
  yield asset
  stack = asset.links.to_a
  while uri = stack.shift
    yield asset = load(uri)
    stack = asset.links.to_a + stack
  end
  nil
end

def find_asset(path, options = {})
  uri, _ = resolve(path, options.merge(compat: false))
  if uri
    load(uri)
  end
end

def inspect
  "#<#{self.class}:0x#{object_id.to_s(16)} " +
    "root=#{root.to_s.inspect}, " +
    "paths=#{paths.inspect}>"
end

def logical_paths
  return to_enum(__method__) unless block_given?
  seen = Set.new
  paths.each do |load_path|
    stat_tree(load_path).each do |filename, stat|
      next unless stat.file?
      path = split_subpath(load_path, filename)
      path, mime_type, _, _ = parse_path_extnames(path)
      path = normalize_logical_path(path)
      path += mime_types[mime_type][:extensions].first if mime_type
      if !seen.include?(path)
        yield path, filename
        seen << path
      end
    end
  end
  nil
end

def matches_filter(filters, logical_path, filename)
  return true if filters.empty?
  filters.any? do |filter|
    if filter.is_a?(Regexp)
      filter.match(logical_path)
    elsif filter.respond_to?(:call)
      if filter.arity == 1
        filter.call(logical_path)
      else
        filter.call(logical_path, filename.to_s)
      end
    else
      File.fnmatch(filter.to_s, logical_path)
    end
  end
end

def normalize_logical_path(path)
  dirname, basename = File.split(path)
  path = dirname if basename == 'index'
  path
end

def resolve_with_compat(path, options = {})
  options = options.dup
  if options.delete(:compat) { true }
    uri, _ = resolve_without_compat(path, options)
    if uri
      path, _ = parse_asset_uri(uri)
      path
    else
      nil
    end
  else
    resolve_without_compat(path, options)
  end
end

def unescape(str)
  str = URI::DEFAULT_PARSER.unescape(str)
  str.force_encoding(Encoding.default_internal) if Encoding.default_internal
  str
end

def unescape(str)
  URI.unescape(str)
end