package org.jboss.resteasy.utils;

/**
 * This class is copied from shared module of wildfly-core testsuite.
 * <p>
 * Adjusts default timeouts according to the system property.
 * <p>
 * All tests influenced by machine slowness should employ this util.
 *
 * @author Ondrej Zizka
 * @author Radoslav Husar
 * @author Jan Lanik
 */
public class TimeoutUtil {

   public static final String FACTOR_SYS_PROP = "ts.timeout.factor";
   private static int factor;

   static {
      factor = Integer.getInteger(FACTOR_SYS_PROP, 100);
   }

   /**
    * Adjusts timeout for operations.
    *
    * @return given timeout adjusted by ratio from system property "ts.timeout.factor"
    */
   public static int adjust(int amount) {
      if (amount < 0) {
         throw new IllegalArgumentException("amount must be non-negative");
      }
      int numerator = amount * factor;
      int finalTimeout;
      if (numerator % 100 == 0) {
         //in this case there is no lost of accuracy in integer division
         finalTimeout = numerator / 100;
      } else {
         /*in this case there is a loss of accuracy. It's better to round the result up because
         if we round down, we would get 0 in case that amount<100.
         */
         finalTimeout = (numerator / 100) + 1;
      }
      return finalTimeout;
   }

   /**
    * Get timeout factor to multiply by.
    *
    * @return double factor value
    */
   public static double getFactor() {
      return (double) factor / 100;
   }

   /**
    * Get raw timeout factor.
    *
    * @return value of parsed system property "ts.timeout.factor"
    */
   public static int getRawFactor() {
      return factor;
   }
}
