class Mindee::Input::LocalResponse

def self.process_secret_key(secret_key)
  secret_key.is_a?(String) ? secret_key.encode('utf-8') : secret_key
end

def as_hash
  @file.rewind
  file_str = @file.read
  JSON.parse(file_str, object_class: Hash)
rescue JSON::ParserError
  raise Errors::MindeeInputError, "File is not a valid dict. #{file_str}"
end

def get_hmac_signature(secret_key)
  algorithm = OpenSSL::Digest.new('sha256')
  begin
    @file.rewind
    mac = OpenSSL::HMAC.hexdigest(algorithm, self.class.process_secret_key(secret_key), @file.read)
  rescue StandardError
    raise Errors::MindeeInputError, 'Could not get HMAC signature from payload.'
  end
  mac
end

def initialize(input_file)
  case input_file
  when IO, StringIO, File, Tempfile
    str_stripped = input_file.read.to_s.gsub(%r{[\r\n]}, '')
    @file = StringIO.new(str_stripped)
    @file.rewind
  when Pathname, String
    @file = if Pathname(input_file.to_s).exist?
              StringIO.new(File.read(input_file.to_s, encoding: 'utf-8').gsub(%r{[\r\n]}, ''))
            else
              StringIO.new(input_file.to_s.gsub(%r{[\r\n]}, ''))
            end
    @file.rewind
  else
    raise Errors::MindeeInputError, "Incompatible type for input '#{input_file.class}'."
  end
end

def valid_hmac_signature?(secret_key, signature)
  signature == get_hmac_signature(secret_key)
end