JavaUtils/zeitlaeufer/src/main/java/de/szimnau/AbstractProgressBar.java

package de.szimnau;

import de.szimnau.tools.FormatTools;
import java.math.BigDecimal;
import java.math.MathContext;
import java.time.LocalTime;


public abstract class AbstractProgressBar extends AbstractLoadingBar {

   protected static final int LINE_LENGTH = 100;
   protected static final BigDecimal ONE_HUNDRED_PERCENT = BigDecimal.valueOf(100);


   protected AbstractProgressBar(LocalTime startTime) {
      super(startTime);
   }


   protected AbstractProgressBar(LocalTime startTime, LocalTime endTime) {
      super(startTime, endTime);
   }


   @Override
   protected String fillLoadingBar(long passedMinutes, boolean progressive) {
      var nonNegativePassedMinutes = BigDecimal.valueOf(passedMinutes < 0 ? 0 : passedMinutes);
      BigDecimal wholePercentage = ONE_HUNDRED_PERCENT
         // kind of reverse dreisatz to avoid having e.g. 99.9999 instead of 100 %
         .multiply(nonNegativePassedMinutes)
         .divide(getTotalMinutesBD(), MathContext.DECIMAL64);
      int numberOfEquals = wholePercentage.intValue();
      var sb = new StringBuilder("[");
      for (int i = 0; i < LINE_LENGTH; i++) {
         if (i < numberOfEquals) {
            sb.append("=");
         } else {
            sb.append("-");
         }
      }
      BigDecimal remainingMinutes = getTotalMinutesBD().subtract(nonNegativePassedMinutes);
      sb.append("] ").append(FormatTools.PERCENTAGE_FORMAT.format(wholePercentage)).append("% ")
          .append(FormatTools.minutesToTimeString(nonNegativePassedMinutes)).append(" - ")
          .append(FormatTools.minutesToTimeString(remainingMinutes));
      if (progressive) {
         sb.append("\r");
      }
      return sb.toString();
   }
}