Enema of the state

bad_state.rb

# frozen_string_literal: true
module Hodor
  class MainService

    attr_accessor :foo_klass,
                  :foo,
                  :foo_id
                  :foo_status,
                  :bar_service,
                  :baz_service,
                  :qux_service

    def initialize(foo_klass = Foo)
      @foo_klass = foo_klass

      #initialize dependencies
      @bar_service = Hodor::BarService.new
      @baz_service = Hodor::BazService.new
      @qux_service = Hodor::QuxService.new
    end

    def call(foo_id, status_name)
      @foo_id = foo_id
      @foo = foo_klass.find(foo_id)
      @foo_status = foo.statuses.where(name: status_name)

      #call each dependent service

      # This service updates all bar records with foo_status to have a different status
      bar_service.(foo_id, foo_status)
      
      # This service erases foo_status from bar's history (join records)
      baz_service.(foo_id, foo_status)
      
      # This service erases foo_status from foo (destroys statuses that were associated with foo)
      qux_service.(foo_id, foo_status)

      # publish changes to foo
      foo
    end
  end
end