foodsoft/app/controllers/admin/configs_controller.rb

class Admin::ConfigsController < Admin::BaseController
  before_action :get_tabs, only: %i[show list]

  def show
    @current_tab = @tabs.include?(params[:tab]) ? params[:tab] : @tabs.first
    @cfg = FoodsoftConfig
  end

  def list
    @current_tab = 'list'
    @cfg = FoodsoftConfig
    @dfl = FoodsoftConfig.config
    @keys = FoodsoftConfig.keys.select { |k| FoodsoftConfig.allowed_key?(k) }.sort
  end

  def update
    parse_recurring_selects! params[:config][:order_schedule]
    ActiveRecord::Base.transaction do
      # TODO: support nested configuration keys
      params[:config].each do |key, val|
        FoodsoftConfig[key] = convert_config_value val
      end
    end
    flash[:notice] = I18n.t('admin.configs.update.notice')
    redirect_to action: 'show'
  end

  protected

  # Set configuration tab names as `@tabs`
  def get_tabs
    @tabs = %w[foodcoop payment tasks messages layout language security others]
    # allow engines to modify this list
    engines = Rails::Engine.subclasses.map(&:instance).select { |e| e.respond_to?(:configuration) }
    engines.each { |e| e.configuration(@tabs, self) }
    @tabs.uniq!
  end

  # turn recurring rules into something palatable
  def parse_recurring_selects!(config)
    return unless config

    for k in %i[pickup boxfill ends] do
      if config[k]
        # allow clearing it using dummy value '{}' ('' would break recurring_select)
        if config[k][:recurr].present? && config[k][:recurr] != '{}'
          config[k][:recurr] = ActiveSupport::JSON.decode(config[k][:recurr])
          config[k][:recurr] = FoodsoftDateUtil.rule_from(config[k][:recurr]).to_ical if config[k][:recurr]
        else
          config[k] = nil
        end
      end
    end
  end

  def convert_config_value(value)
    if value.is_a? ActionController::Parameters
      value.transform_values { |v| convert_config_value(v) }.to_hash
    else
      value
    end
  end
end