class UserAbility
  include CanCan::Ability

  def initialize(member)
    return if Ability.user_permissions[member.role].nil?

    # Iterate through member permissions
    Ability.user_permissions[member.role].each do |action, rules|
      if rules.kind_of?(Array)
        # Iterate through a list of member model access
        rules.each do |rule|
          # check if rule define attributes
          if rule.is_a?(Hash)
            model = rule.keys.first
            attributes = rule[model].map(&:to_sym)
            # example, can :update, Currency, [:visible, :name] (model attributes)
          else
            model = rule
            # example, can :update, Currency
          end
          can action.to_sym, model == 'all' ? model.to_sym : model.constantize, attributes
        end
      else
        can action.to_sym, rules == 'all' ? rules.to_sym : rules.constantize
      end
    end
  end
end