# frozen_string_literal: true

module Tesseract
  module Transaction
    module Steps
      # Adds a "use" step that will call other transactions. If that
      # transaction returns a Hash, it will be merged with the input hash and
      # returned, otherwise the step returns the result of the transaction. If
      # the transaction results in a Failure, that failure is returned.
      #
      # Usage:
      #
      #   use MyTransaction
      #
      module Use
        extend ActiveSupport::Concern

        module ClassMethods
          def use(transaction, **kwargs)
            method_name = (transaction.is_a?(Class) ? transaction : transaction.class).name.intern
            step method_name
            define_method method_name do |params|
              params.merge!(kwargs)
              result = transaction.call(params)
              result.fmap { |value| value.is_a?(Hash) ? params.merge(value) : params }
            end
          end
        end
      end
    end
  end
end