class Sprockets::Base

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

def attributes_for(path)
  AssetAttributes.new(self, path)
end

def build_asset(logical_path, pathname, options)
  pathname = Pathname.new(pathname)
  # If there are any processors to run on the pathname, use
  # `BundledAsset`. Otherwise use `StaticAsset` and treat is as binary.
  if attributes_for(pathname).processors.any?
    if options[:bundle] == false
      circular_call_protection(pathname.to_s) do
        ProcessedAsset.new(index, logical_path, pathname)
      end
    else
      BundledAsset.new(index, logical_path, pathname)
    end
  else
    StaticAsset.new(index, logical_path, pathname)
  end
end

def cache=(cache)
  expire_index!
  @cache = cache
end

def cache_key_for(path, options)
  "#{path}:#{options[:bundle] ? '1' : '0'}"
end

def circular_call_protection(path)
  reset = Thread.current[:sprockets_circular_calls].nil?
  calls = Thread.current[:sprockets_circular_calls] ||= Set.new
  if calls.include?(path)
    raise CircularDependencyError, "#{path} has already been required"
  end
  calls << path
  yield
ensure
  Thread.current[:sprockets_circular_calls] = nil if reset
end

def content_type_of(path)
  attributes_for(path).content_type
end

def digest
  # Compute the initial digest using the implementation class. The
  # Sprockets release version and custom environment version are
  # mixed in. So any new releases will affect all your assets.
  @digest ||= digest_class.new.update(VERSION).update(version.to_s)
  # Returned a dupped copy so the caller can safely mutate it with `.update`
  @digest.dup
end

def digest_class=(klass)
  expire_index!
  @digest_class = klass
end

def each_entry(root, &block)
  return to_enum(__method__, root) unless block_given?
  root = Pathname.new(root) unless root.is_a?(Pathname)
  paths = []
  entries(root).sort.each do |filename|
    path = root.join(filename)
    paths << path
    if stat(path).directory?
      each_entry(path) do |subpath|
        paths << subpath
      end
    end
  end
  paths.sort_by(&:to_s).each(&block)
  nil
end

def each_file
  return to_enum(__method__) unless block_given?
  paths.each do |root|
    each_entry(root) do |path|
      if !stat(path).directory?
        yield path
      end
    end
  end
  nil
end

def each_logical_path(*args)
  return to_enum(__method__, *args) unless block_given?
  filters = args.flatten
  files = {}
  each_file do |filename|
    if logical_path = logical_path_for_filename(filename, filters)
      yield logical_path unless files[logical_path]
      files[logical_path] = true
    end
  end
  nil
end

def entries(pathname)
  trail.entries(pathname)
end

def expire_index!
  raise NotImplementedError
end

def file_digest(path)
  if stat = self.stat(path)
    # If its a file, digest the contents
    if stat.file?
      digest.file(path.to_s)
    # If its a directive, digest the list of filenames
    elsif stat.directory?
      contents = self.entries(path).join(',')
      digest.update(contents)
    end
  end
end

def find_asset(path, options = {})
  logical_path = path
  pathname     = Pathname.new(path)
  if pathname.absolute?
    return unless stat(pathname)
    logical_path = attributes_for(pathname).logical_path
  else
    begin
      pathname = resolve(logical_path)
    rescue FileNotFound
      return nil
    end
  end
  build_asset(logical_path, pathname, options)
end

def index
  raise NotImplementedError
end

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

def logical_path_for_filename(filename, filters)
  logical_path = attributes_for(filename).logical_path.to_s
  if matches_filter(filters, logical_path)
    return logical_path
  end
  # If filename is an index file, retest with alias
  if File.basename(logical_path)[/[^\.]+/, 0] == 'index'
    path = logical_path.sub(/\/index\./, '.')
    if matches_filter(filters, path)
      return path
    end
  end
  nil
end

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

def stat(path)
  trail.stat(path)
end

def version=(version)
  expire_index!
  @version = version
end