class Bundler::CompactIndexClient::Cache

def checksums
  checksums = {}
  lines(versions_path).each do |line|
    name, _, checksum = line.split(" ", 3)
    checksums[name] = checksum
  end
  checksums
end

def dependencies(name)
  lines(info_path(name)).map do |line|
    parse_gem(line)
  end
end

def info_path(name)
  name = name.to_s
  if /[^a-z0-9_-]/.match?(name)
    name += "-#{SharedHelpers.digest(:MD5).hexdigest(name).downcase}"
    info_roots.last.join(name)
  else
    info_roots.first.join(name)
  end
end

def info_roots
  [
    directory.join("info"),
    directory.join("info-special-characters"),
  ]
end

def initialize(directory)
  @directory = Pathname.new(directory).expand_path
  info_roots.each do |dir|
    SharedHelpers.filesystem_access(dir) do
      FileUtils.mkdir_p(dir)
    end
  end
end

def lines(path)
  return [] unless path.file?
  lines = SharedHelpers.filesystem_access(path, :read, &:read).split("\n")
  header = lines.index("---")
  header ? lines[header + 1..-1] : lines
end

def names
  lines(names_path)
end

def names_path
  directory.join("names")
end

def parse_gem(line)
  @dependency_parser ||= GemParser.new
  @dependency_parser.parse(line)
end

def versions
  versions_by_name = Hash.new {|hash, key| hash[key] = [] }
  info_checksums_by_name = {}
  lines(versions_path).each do |line|
    name, versions_string, info_checksum = line.split(" ", 3)
    info_checksums_by_name[name] = info_checksum || ""
    versions_string.split(",").each do |version|
      if version.start_with?("-")
        version = version[1..-1].split("-", 2).unshift(name)
        versions_by_name[name].delete(version)
      else
        version = version.split("-", 2).unshift(name)
        versions_by_name[name] << version
      end
    end
  end
  [versions_by_name, info_checksums_by_name]
end

def versions_path
  directory.join("versions")
end