/*
    * Copyright (c) 2006 JMockit developers
    * This file is subject to the terms of the MIT license (see LICENSE.txt).
    */
   package mockit.coverage;
   
   import edu.umd.cs.findbugs.annotations.NonNull;
   
   import org.checkerframework.checker.index.qual.NonNegative;
  
  public final class CoveragePercentage {
      private CoveragePercentage() {
      }
  
      public static int calculate(@NonNegative int coveredCount, @NonNegative int totalCount) {
          if (totalCount == 0) {
              return -1;
          }
  
          // noinspection NumericCastThatLosesPrecision
          return (int) (100.0 * coveredCount / totalCount + 0.5);
      }
  
      @NonNull
      public static String percentageColor(@NonNegative int coveredCount, @NonNegative int totalCount) {
          if (coveredCount == 0) {
              return "ff0000";
          }
          if (coveredCount == totalCount) {
              return "00ff00";
          }
  
          double percentage = 100.0 * coveredCount / totalCount;
          // noinspection NumericCastThatLosesPrecision
          int green = (int) (0xFF * percentage / 100.0 + 0.5);
          int red = 0xFF - green;
  
          StringBuilder color = new StringBuilder(6);
          appendColorInHexadecimal(color, red);
          appendColorInHexadecimal(color, green);
          color.append("00");
  
          return color.toString();
      }
  
      private static void appendColorInHexadecimal(@NonNull StringBuilder colorInHexa, @NonNegative int rgb) {
          String hex = Integer.toHexString(rgb);
  
          if (hex.length() == 1) {
              colorInHexa.append('0');
          }
  
          colorInHexa.append(hex);
      }
  }