class Opal::CliRunners::MiniRacer

def self.call(data)
  ::MiniRacer::Platform.set_flags! :harmony
  builder = data.fetch(:builder).call
  output = data.fetch(:output)
  # TODO: pass it
  argv = data.fetch(:argv)
  # MiniRacer doesn't like to fork. Let's build Opal first
  # in a forked environment.
  code = builder.to_s + "\n" + builder.source_map.to_data_uri_comment
  v8 = ::MiniRacer::Context.new
  v8.attach('prompt', ->(_msg = '') { $stdin.gets&.chomp })
  v8.attach('console.log', ->(i) { output.print(i); output.flush })
  v8.attach('console.warn', ->(i) { $stderr.print(i); $stderr.flush })
  v8.attach('crypto.randomBytes', method(:random_bytes).to_proc)
  v8.attach('opalminiracer.exit', ->(status) { Kernel.exit(status) })
  v8.attach('opalminiracer.argv', argv)
  v8.eval(code)
end

def self.random_bytes(bytes)
  ::SecureRandom.bytes(bytes).split('').map(&:ord)
end