class Bundler::CompactIndexClient

def dependencies(names)
  in_parallel.call(names) do |name|
    update_info(name)
    @cache.dependencies(name).map {|d| d.unshift(name) }
  end.flatten(1)
end

def initialize(directory, fetcher)
  @directory = Pathname.new(directory)
  @updater = Updater.new(fetcher)
  @cache = Cache.new(@directory)
  @endpoints = Set.new
  @info_checksums_by_name = {}
  @in_parallel = lambda do |inputs, &blk|
    inputs.map(&blk)
  end
end

def names
  update(@cache.names_path, "names")
  @cache.names
end

def spec(name, version, platform = nil)
  update_info(name)
  @cache.specific_dependency(name, version, platform)
end

def update(local_path, remote_path)
  return if @endpoints.include?(remote_path)
  @updater.update(local_path, url(remote_path))
  @endpoints << remote_path
end

def update_and_parse_checksums!
  return @info_checksums_by_name if @parsed_checksums
  update(@cache.versions_path, "versions")
  @info_checksums_by_name = @cache.checksums
  @parsed_checksums = true
end

def update_info(name)
  path = @cache.info_path(name)
  checksum = @updater.checksum_for_file(path)
  return unless existing = @info_checksums_by_name[name]
  return if checksum == existing
  update(path, "info/#{name}")
end

def url(path)
  path
end

def versions
  update(@cache.versions_path, "versions")
  versions, @info_checksums_by_name = @cache.versions
  versions
end