Compare recurring invoice html output

compare_recurring_invoices.rb

class CompareRecurringInvoiceProfiles
  def self.perform
    recurring_invoice_count = RecurringInvoiceProfile.count
    progress = ProgressBar.new(recurring_invoice_count)
    RecurringInvoiceProfile.all.find_each do |recurring_invoice_profile|
      render_and_compare(recurring_invoice_profile.source_recurring_invoice, recurring_invoice_profile)

      progress.increment!
    end
  end

  def self.render_and_compare(recurring_invoice, recurring_invoice_profile)
    instance = setup_instance(recurring_invoice: recurring_invoice, enabled: false)
    html_feature_switch_off = instance.render_to_string(
      "show", layout: false
    ).gsub(/\s/, "")

    instance = setup_instance(recurring_invoice: recurring_invoice_profile, enabled: true)
    html_feature_switch_on = instance.render_to_string(
      "show", layout: false
    ).gsub(/\s/, "")

    diff_strings(recurring_invoice.id, html_feature_switch_off, html_feature_switch_on)
  end

  def self.setup_instance(recurring_invoice:, enabled: false)
    request = ActionDispatch::Request.new(
      "HTTP_HOST"=>"example.org",
      "HTTPS"=>"on",
      "REQUEST_METHOD"=>"GET",
      "SCRIPT_NAME"=>"",
      "Content-Type" => "application/json",
      "Accept" => "application/json",
      "rack.input"=>"",
      "rack.url_scheme"=>"https"
    )

    request.routes = RecurringInvoicesController._routes

    instance = RecurringInvoicesController.new
    instance.instance_variable_set(:@current_company, recurring_invoice.company)
    instance.instance_variable_set(:@recurring_invoice_profile_read, enabled)
    instance.instance_variable_set(:@invoice, recurring_invoice)
    instance.set_request! request
    instance.set_response! RecurringInvoicesController.make_response!(request)
    instance
  end

  def self.diff_strings(id, html_feature_switch_off, html_feature_switch_on)
    return if html_feature_switch_off == html_feature_switch_on

    on_chars = html_feature_switch_on.chars
    off_chars = html_feature_switch_off.chars

    diff_start = -1
    on_chars.each_with_index do |c, i|
      if c != off_chars[i] && diff_start == -1
        diff_start = i
      end
    end

    Rails.logger.info({
      log_tag: "RECURRING INVOICE COMPAIRE FAILURE",
      id: id,
      charater_failed_at: diff_start,
      feature_on: on_chars[diff_start-30..diff_start+30].join("") ,
      feature_off: off_chars[diff_start-30..diff_start+30].join("")
    }.to_json)
    false
  end
end