content: package me.tongfei.progressbar;
  
  /*-
   * #%L
   * TongFei ProgressBar
   * %%
   * Copyright (C) 2014 - 2018 Tongfei Chen
   * %%
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   * 
   *      http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   * #L%
   */
  
  import jline.Terminal;
  import jline.TerminalFactory;
  import org.joda.time.DateTimeZone;
  import org.joda.time.Duration;
  import org.joda.time.LocalDateTime;
  
  import java.io.PrintStream;
  
  /**
   * @author Tongfei Chen
   * @since 0.5.0
   */
  class ProgressThread implements Runnable {
  
      volatile boolean killed;
      ProgressBarStyle style;
      ProgressState progress;
      long updateInterval;
      PrintStream consoleStream;
      Terminal terminal;
      int consoleWidth = 80;
  
      static int consoleRightMargin = 2;
  
      int length;
  
      ProgressThread(ProgressState progress, ProgressBarStyle style, long updateInterval, PrintStream consoleStream) {
          this.progress = progress;
          this.style = style;
          this.updateInterval = updateInterval;
          this.consoleStream = consoleStream;
          this.killed = false;
  
          this.terminal = TerminalFactory.get();
  
          if (terminal.getWidth() >= 10)  // Workaround for issue #23 under IntelliJ
              consoleWidth = terminal.getWidth();
      }
  
      // between 0 and 1
      double progress() {
          if (progress.max <= 0) return 0.0;
          else return ((double)progress.current) / progress.max;
      }
  
      // Number of full blocks
      int progressIntegralPart() {
          return (int)(progress() * length);
      }
  
      int progressFractionalPart() {
          double p = progress() * length;
          double fraction = (p - Math.floor(p)) * style.fractionSymbols.length();
          return (int) Math.floor(fraction);
      }
  
      String eta(Duration elapsed) {
          if (progress.max <= 0 || progress.indefinite) return "?";
          else if (progress.current == 0) return "?";
          else return Util.formatDuration(
                  elapsed.dividedBy(progress.current)
                          .multipliedBy(progress.max - progress.current));
      }
  
      String percentage() {
          String res;
          if (progress.max <= 0 || progress.indefinite) res = "? %";
          else res = String.valueOf((int) Math.floor(100.0 * progress.current / progress.max)) + "%";
          return Util.repeat(' ', 4 - res.length()) + res;
      }
  
      String ratio() {
          String m = progress.indefinite ? "?" : String.valueOf(progress.max);
          String c = String.valueOf(progress.current);
          return Util.repeat(' ', m.length() - c.length()) + c + "/" + m;
      }
  
      void refresh() {
          consoleStream.print("\r");
  
          LocalDateTime currTime = LocalDateTime.now();
          Duration elapsed = new Duration(progress.startTime.toDateTime(DateTimeZone.UTC), currTime.toDateTime(DateTimeZone.UTC));
  
          String prefix = progress.task + " " + percentage() + " " + style.leftBracket;
  
          int maxSuffixLength = Math.max(0, consoleWidth - consoleRightMargin - prefix.length() - 10);
          String suffix = style.rightBracket + " " + ratio() + " (" + Util.formatDuration(elapsed) + " / " + eta(elapsed) + ") " + progress.extraMessage;
          if (suffix.length() > maxSuffixLength) suffix = suffix.substring(0, maxSuffixLength);
  
          length = consoleWidth - consoleRightMargin - prefix.length() - suffix.length();
  
          StringBuilder sb = new StringBuilder();
          sb.append(prefix);
  
          // case of indefinite progress bars
          if (progress.indefinite) {
              int pos = (int)(progress.current % length);
              sb.append(Util.repeat(style.space, pos));
              sb.append(style.block);
              sb.append(Util.repeat(style.space, length - pos - 1));
          }
          // case of definite progress bars
          else {
              sb.append(Util.repeat(style.block, progressIntegralPart()));
              if (progress.current < progress.max) {
                  sb.append(style.fractionSymbols.charAt(progressFractionalPart()));
                  sb.append(Util.repeat(style.space, length - progressIntegralPart() - 1));
              }
          }
          sb.append(suffix);
          String line = sb.toString();
  
          consoleStream.print(line);
      }
  
      void kill() {
      	killed = true;
      }
  
      public void run() {
          try {
              while (!killed) {
                  refresh();
                  Thread.sleep(updateInterval);
              }
              refresh();
              // do-while loop not right: must force to refresh after stopped
          } catch (InterruptedException ex) { }
      }
  }
  