71 lines
3.2 KiB
Java
71 lines
3.2 KiB
Java
import java.io.BufferedReader;
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import java.io.InputStreamReader;
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import java.io.IOException;
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import java.math.BigDecimal;
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import java.math.MathContext;
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import java.math.RoundingMode;
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import java.nio.charset.StandardCharsets;
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import java.text.DecimalFormat;
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import java.time.LocalTime;
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import java.time.format.DateTimeFormatter;
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import java.time.temporal.ChronoUnit;
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import java.util.concurrent.TimeUnit;
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public class DrinkingBar {
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private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("HH:mm");
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private static final int MINS_PER_HOUR = 60;
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private static final int MINS_PER_HALF_HOUR = MINS_PER_HOUR / 2;
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private static final int MINUTES_BEFORE_PAUSE = 4 * MINS_PER_HOUR + MINS_PER_HALF_HOUR;
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private static final int MINUTES_WITH_PAUSE = 6 * MINS_PER_HOUR;
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private static final DecimalFormat LITER_FORMAT = new DecimalFormat("0.00");
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private static final BigDecimal MINS_PER_HOUR_BD = BigDecimal.valueOf(MINS_PER_HOUR);
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private static final MathContext MC_INTEGER = new MathContext(1, RoundingMode.HALF_EVEN);
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public static void main(String[] args) throws IOException {
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var br = new BufferedReader(new InputStreamReader(System.in, StandardCharsets.UTF_8));
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System.out.print("Ankunftszeit: ");
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var startTime = LocalTime.parse(br.readLine(), TIME_FORMATTER).truncatedTo(ChronoUnit.MINUTES);
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long totalMinutes = 8 * MINS_PER_HOUR + MINS_PER_HALF_HOUR;
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long passedMinutes = startTime.until(LocalTime.now().truncatedTo(ChronoUnit.MINUTES), ChronoUnit.MINUTES);
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// long passedMinutes = 0; // DEBUG
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boolean firstPrint = true;
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double prevPrintedLitres = 0.0;
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while (passedMinutes < totalMinutes) {
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if (passedMinutes <= MINUTES_BEFORE_PAUSE || passedMinutes > MINUTES_WITH_PAUSE) {
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double currentLitres = 2.0 / totalMinutes * passedMinutes;
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double printedLitres = currentLitres - (currentLitres % 0.25) + 0.25;
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String cursorReset = firstPrint ? "" : "\r";
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if (firstPrint || printedLitres - prevPrintedLitres == 0.25) {
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System.out.print(cursorReset + "Aktuelles Volumen: " + LITER_FORMAT.format(printedLitres) + "L");
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}
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prevPrintedLitres = printedLitres;
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if (firstPrint) {
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firstPrint = false;
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}
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}
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try {
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var now = LocalTime.now();
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var oneMinuteLater = now.plusMinutes(1).truncatedTo(ChronoUnit.MINUTES);
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// +1 second to adjust for ignored milliseconds as it is better to switch between 00 and 01 as between 59 and 00
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TimeUnit.SECONDS.sleep(now.until(oneMinuteLater, ChronoUnit.SECONDS) + 1);
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// TimeUnit.MILLISECONDS.sleep(100L); // DEBUG
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} catch (InterruptedException ie) {
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throw new RuntimeException(ie);
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}
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passedMinutes++;
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}
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System.out.println("");
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}
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private static String minutesToTimeString(long minutes) { // DEBUG
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var minutesBD = BigDecimal.valueOf(minutes);
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BigDecimal[] hoursAndMinutes = minutesBD.divideAndRemainder(MINS_PER_HOUR_BD, MC_INTEGER);
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return LocalTime.of(hoursAndMinutes[0].intValue(), hoursAndMinutes[1].intValue()).format(TIME_FORMATTER);
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}
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}
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