module PwnedPasswordsV2

# File lib/pwned_passwords_v2.rb, line 6
def self.have_i?(password)
  sha1_hash = Digest::SHA1.hexdigest(password).upcase
  sha1_hash_prefix = sha1_hash[0..4]

  response = open("https://api.pwnedpasswords.com/range/#{sha1_hash_prefix}").read

  sha1_hash_prefix_matches = response.split(/\r?\n/)

  if sha1_hash_prefix_matches.size == 0
    raise "No sha1 prefix matches returned from https://api.pwnedpasswords.com. The service is probably broken."
  end

  sha1_hash_prefix_matches.each_with_index do |sha1_hash_prefix_match, line|
    unless sha1_hash_prefix_match.strip[/\b[0-9A-F]{35}:[0-9]+$\b/]
      raise "Unexpected response format in line #{line + 1} - #{sha1_hash_prefix_match}"
    end

    sha1_hash_suffix = sha1_hash_prefix_match.split(':')[0]

    return sha1_hash_prefix_match.split(':')[1].to_i if "#{sha1_hash_prefix}#{sha1_hash_suffix}" == sha1_hash
  end

  return 0
end