package de.szimnau;

import de.szimnau.tools.FormatTools;
import java.time.LocalTime;
import java.util.*;

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


public class SimpleLoadingBar extends AbstractProgressBar {

   private final String title;


   private SimpleLoadingBar(LocalTime startTime, LocalTime endTime, String title) {
      super(startTime, endTime);
      this.title = initTitle(title);
   }


   public static void main(String[] args) {
      if (args.length > 0 && Objects.equals(args[0], "--help")) {
         printHelp();
         return;
      }
      verifyMinimumNumberOfArgs(args);
      String nextArg = args[0];
      verifyTimeFormat(nextArg, "Erstes Argument");
      var firstTime = LocalTime.parse(nextArg, FormatTools.TIME_FORMATTER);
      LocalTime startTime;
      String title = "";
      LocalTime endTime = null;
      if (args.length > 1) {
         nextArg = args[1];
         if ("-msg".equals(nextArg)) {
            title = args.length > 2 ? args[2] : title;
         } else {
            verifyTimeFormat(nextArg, "Zweites Argument");
            endTime = LocalTime.parse(nextArg, FormatTools.TIME_FORMATTER);
         }
      }
      if (endTime == null) {
         startTime = LocalTime.now();
         endTime = firstTime;
      } else {
         startTime = firstTime;
      }
      if (args.length == 2 || !title.isBlank()) {
         new SimpleLoadingBar(startTime, endTime, title).showLoadingBar();
         return;
      }
      // if there are 3 arguments, the third will be discarded.
      boolean hasTitleArg = args.length > 3 && "-msg".equals(args[2]);
      title = hasTitleArg ? args[3] : title;
      new SimpleLoadingBar(startTime, endTime, title).showLoadingBar();
   }


   private static void printHelp() {
      println("Mögliche Argumente für LoadingBar:\n"
          + "Startzeit, Endzeit, Endnachricht (Optional)\n"
          + FormatTools.TIME_FORMAT + " " + FormatTools.TIME_FORMAT + " -msg <Nachricht>\n"
          + "Endzeit (Startzeit = jetzt), Endnachricht (Optional)\n"
          + FormatTools.TIME_FORMAT + " -msg <Nachricht>\n"
      );
   }


   private static void verifyMinimumNumberOfArgs(String[] args) {
      if (args.length >= 1) {
         return;
      }
      println("Mindestens 1 Argument muss gegeben sein.");
      printHelp();
      System.exit(1);
   }


   private static void verifyTimeFormat(String param, String errMsgPrefix) {
      if (FormatTools.TIME_PATTERN.matcher(param).matches()) {
         return;
      }
      println(errMsgPrefix + " \"" + param + "\" muss Uhrzeitformat (" + FormatTools.TIME_FORMAT + ") entsprechen.");
      System.exit(1);
   }


   private String initTitle(String inputTitle) {
      String fallbackTitle = "Ende! Endzeit " + FormatTools.TIME_FORMATTER.format(getEndTime()) + " erreicht.";
      String effectiveTitle = inputTitle == null || inputTitle.isBlank() ? fallbackTitle : inputTitle;
      String separator = "*".repeat(effectiveTitle.length());
      return separator + "\n" + effectiveTitle + "\n" + separator;
   }


   @Override
   public void showLoadingBar() {
      super.showLoadingBar();
      // showLoadingBarDebug(); // DEBUG
      println(title);
   }
}