# frozen_string_literal: true

module Hashtastic
  class EthereumSHA3
    class << self
      def call(*values)
        values = values.flatten.map do |value|
          if value.is_a?(String)
            if value[0..1] == '0x'
              value[2..-1]
            else
              value.unpack('H*')
            end
          elsif value.is_a?(Numeric)
            value.to_s(16).rjust(64, '0')
          else
            ''
          end
        end

        "0x#{Digest::SHA3.hexdigest(packed_values(values), 256)}"
      end

      def packed_values(values)
        [values.join].pack('H*')
      end

      alias digest call
    end
  end
end