package de.vorsorge.theo.util;

import java.io.IOException;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.text.DecimalFormat;
import java.time.Duration;
import java.time.ZonedDateTime;
import java.time.temporal.ChronoUnit;

public class FabianUtil {

   public static String ENDING_TXT = "txt";
   public static String ENDING_JSON = "json";
   public static String ENDING_HTML = "html";
   public static String ENDING_PDF = "pdf";
   public static String ENDING_TIFF = "tiff";


   private FabianUtil() {}


   public static class ProgressHandler {

      private static final DecimalFormat TIME_DECIMAL_FORMAT = new DecimalFormat("00");

      private final ZonedDateTime startTime;
      private final BigDecimal logDistance;
      private BigDecimal counter = BigDecimal.ZERO;


      public ProgressHandler(int logDistance) {
         startTime = ZonedDateTime.now();
         if (logDistance < 1) {
            throw new RuntimeException("Log-Distanz darf nicht 0 oder negativ sein.");
         }
         this.logDistance = BigDecimal.valueOf(logDistance);
      }


      protected BigDecimal getCounter() {
         return counter;
      }


      public void tickAndLog() {
         tick();
         logIf();
      }


      protected void tick() {
         counter = counter.add(BigDecimal.ONE);
      }


      public void logAndTick() {
         logIf();
         tick();
      }


      public void logIf() {
         if (counter.remainder(logDistance).signum() == 0) {
            log();
         }
      }


      public void log() {
         Duration timePassed = getTimePassed();
         System.out.println(counter + " Stück erledigt. " + formatDuration(timePassed) + " vergangen.");
      }


      protected Duration getTimePassed() {
         return Duration.ofSeconds(startTime.until(ZonedDateTime.now(), ChronoUnit.SECONDS));
      }


      protected String formatDuration(Duration dur) {
         return formatLong(dur.toHours()) + ":" + formatInt(dur.toMinutesPart()) + ":" + formatInt(dur.toSecondsPart());
      }


      private String formatLong(long n) {
         return TIME_DECIMAL_FORMAT.format(n);
      }


      private String formatInt(int n) {
         return TIME_DECIMAL_FORMAT.format(n);
      }
   }


   public static class ProgressHandlerWithTotal extends ProgressHandler {

      private static final DecimalFormat PERCENTAGE_FORMAT = new DecimalFormat("00.00");

      private final BigDecimal total;


      public ProgressHandlerWithTotal(int logDistance, int total) {
         super(logDistance);
         if (total < 1) {
            throw new RuntimeException("Maximale Anzahl darf nicht 0 oder negativ sein.");
         }
         this.total = BigDecimal.valueOf(total);
      }


      @Override
      public void log() {
         BigDecimal counter = getCounter();
         BigDecimal percentage = BigDecimal.valueOf(100).divide(total, 15, RoundingMode.HALF_UP).multiply(counter);

         Duration timePassed = getTimePassed();

         String remainingTimePart = "";
         if (counter.signum() != 0) {
            BigDecimal secondsPassed = BigDecimal.valueOf(timePassed.getSeconds());
            BigDecimal totalSeconds = secondsPassed.divide(counter, 15, RoundingMode.HALF_UP).multiply(total);
            BigDecimal secondsToGo = totalSeconds.subtract(secondsPassed);
            Duration timeToGo = Duration.of(secondsToGo.longValue(), ChronoUnit.SECONDS);
            remainingTimePart = ", " + formatDuration(timeToGo) + " verbleibend";
         }

         System.out.println(counter + " Stück von " + total + " (" + PERCENTAGE_FORMAT.format(percentage.doubleValue()) + " %) erledigt. "
             + formatDuration(timePassed) + " vergangen" + remainingTimePart + ".");
      }


      public void logFinal() {
         Duration timePassed = getTimePassed();
         System.out.println(total + " Stück (100 %) erledigt. " + formatDuration(timePassed) + " vergangen.");
      }
   }


   public static void writeTestOutput(String filename, String ending, String content) {
      writeTestOutput(filename, ending, strToBytes(content));
   }


   public static byte[] strToBytes(String str) {
      return str.getBytes(StandardCharsets.UTF_8);
   }


   public static void writeTestOutput(String filename, String ending, byte[] content) {
      writeToFile("C:/theo_dev/temp/testOutput/", filename, ending, content);
   }


   public static void writeDump(String ending, String content) {
      writeDump(ending, strToBytes(content));
   }


   public static void writeDump(String ending, byte[] content) {
      writeToFile("C:/theo_dev/temp/", "dump", ending, content);
   }


   public static void writeDump(String filename, String ending, String content) {
      writeDump(filename, ending, strToBytes(content));
   }


   public static void writeDump(String filename, String ending, byte[] content) {
      writeToFile("C:/theo_dev/temp/", filename, ending, content);
   }


   public static void writeToFile(String path, String filename, String ending, byte[] content) {
      try {
         Files.write(Paths.get(path + filename + "." + ending), content);
      } catch (IOException e) {
         throw new RuntimeException(e);
      }
   }
}