package de.szimnau;

import de.szimnau.tools.CommonTools;
import de.szimnau.tools.FormatTools;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.math.BigDecimal;
import java.nio.charset.StandardCharsets;
import java.text.DecimalFormat;
import java.time.LocalTime;
import java.time.temporal.ChronoUnit;

import static de.szimnau.tools.CommonTools.print;


public class DrinkingBar extends AbstractLoadingBar {

   private static final int MINS_PER_HALF_HOUR = CommonTools.MINS_PER_HOUR / 2;
   private static final int MINUTES_BEFORE_PAUSE = 4 * CommonTools.MINS_PER_HOUR + MINS_PER_HALF_HOUR;
   private static final int MINUTES_WITH_PAUSE = 6 * CommonTools.MINS_PER_HOUR;
   private static final int DEFAULT_TOTAL_TIME = 8 * MINS_PER_HOUR + MINS_PER_HALF_HOUR;
   private static final DecimalFormat LITER_FORMAT = new DecimalFormat("0.00");


   protected DrinkingBar(LocalTime startTime) {
      super(startTime, DEFAULT_TOTAL_TIME);
   }


   public static void main(String[] args) throws IOException {
      var br = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
      print("Ankunftszeit: ");
      var startTime = LocalTime.parse(br.readLine(), FormatTools.TIME_FORMATTER).truncatedTo(ChronoUnit.MINUTES);
      var db = new DrinkingBar(startTime);
      db.showLoadingBar();
   }


   @Override
   protected String fillLoadingBar(long passedMinutes, boolean progressive) {
      long effectivePassedMinutes = passedMinutes;
      if (passedMinutes > MINUTES_BEFORE_PAUSE && passedMinutes <= MINUTES_WITH_PAUSE) {
         effectivePassedMinutes = MINUTES_BEFORE_PAUSE;
      }
      double currentLitres = 2.0 / getTotalMinutes() * effectivePassedMinutes + 0.25;
      double printedLitres = currentLitres - (currentLitres % 0.25);
      // double currentProgressToNextStep = 100 / 0.25 * (currentLitres - printedLitres);
      BigDecimal minutesToNextStep = getMinutesToNextStep(currentLitres);
      String progressivePart = progressive ? "\r" : "";
      return progressivePart + "Aktuelles Volumen: " + LITER_FORMAT.format(printedLitres) + "L - "
         // + FormatTools.PERCENTAGE_FORMAT.format(currentProgressToNextStep) + "% - "
         + FormatTools.minutesToTimeString(minutesToNextStep);
   }


   private BigDecimal getMinutesToNextStep(double currentLitres) {
      // berechne Liter benötigt bis zum nächsten 0.25er Schritt
      double litresToNextStep = 0.25 - (currentLitres % 0.25);
      // berechne Minuten benötigt für 1 Liter
      double minutesPerLitre = getTotalMinutes() / 2.0;
      // berechne Minuten benötigt bis zum nächsten 0.25er Schritt
      return BigDecimal.valueOf((minutesPerLitre * litresToNextStep) + 1);
   }
}