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package csip.utils;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
   Timed check pointing.

   @author od
 */
public class CheckPointing {

  static final String ROW = "[%1$tH:%1$tM:%1$tS.%1$tL] delta: %2$5d ms - %3$s\n";

  List<CP> cps = new ArrayList<>();

  private static class CP {

    Date time;
    String msg;


    CP(Date time, String msg) {
      this.time = time;
      this.msg = msg;
    }
  }


  public void check(String msg) {
    cps.add(new CP(new Date(), msg));
  }


  @Override
  public String toString() {
    StringBuilder s = new StringBuilder();
    for (int i = 0; i < cps.size(); i++) {
      CP cp = cps.get(i);
      long diff = (i > 0) ? cp.time.getTime() - cps.get(i - 1).time.getTime() : 0;
      s.append(String.format(ROW, cp.time, diff, cp.msg));
    }
    return s.toString();
  }

}