From 45d5ee8e901d32538761c7f0b256ac07a53442dc Mon Sep 17 00:00:00 2001
From: yoyosource <yoyosource@nidido.de>
Date: Sun, 21 Mar 2021 14:09:54 +0100
Subject: [PATCH] Add TPSLimitCommand

---
 .../spectatesystem/SpectateSystem.java        |   2 +
 .../commands/TPSLimitCommand.java             | 114 ++++++++++++++++++
 src/plugin.yml                                |   1 +
 3 files changed, 117 insertions(+)
 create mode 100644 src/de/steamwar/spectatesystem/commands/TPSLimitCommand.java

diff --git a/src/de/steamwar/spectatesystem/SpectateSystem.java b/src/de/steamwar/spectatesystem/SpectateSystem.java
index fbd45b2..5c5f3d3 100644
--- a/src/de/steamwar/spectatesystem/SpectateSystem.java
+++ b/src/de/steamwar/spectatesystem/SpectateSystem.java
@@ -21,6 +21,7 @@ package de.steamwar.spectatesystem;
 
 import de.steamwar.spectatesystem.commands.InspectCommand;
 import de.steamwar.spectatesystem.commands.ReplayCommand;
+import de.steamwar.spectatesystem.commands.TPSLimitCommand;
 import de.steamwar.spectatesystem.elements.RScoreboard;
 import de.steamwar.spectatesystem.listener.PlayerListener;
 import de.steamwar.spectatesystem.listener.CancelListener;
@@ -60,6 +61,7 @@ public class SpectateSystem extends JavaPlugin {
 
         Bukkit.getPluginCommand("replay").setExecutor(new ReplayCommand());
         Bukkit.getPluginCommand("inspect").setExecutor(new InspectCommand());
+        Bukkit.getPluginCommand("tpslimit").setExecutor(new TPSLimitCommand());
         WorldLoader.configureForceLoad();
     }
 
diff --git a/src/de/steamwar/spectatesystem/commands/TPSLimitCommand.java b/src/de/steamwar/spectatesystem/commands/TPSLimitCommand.java
new file mode 100644
index 0000000..d776965
--- /dev/null
+++ b/src/de/steamwar/spectatesystem/commands/TPSLimitCommand.java
@@ -0,0 +1,114 @@
+package de.steamwar.spectatesystem.commands;
+
+import de.steamwar.spectatesystem.SpectateSystem;
+import de.steamwar.sql.SteamwarUser;
+import net.md_5.bungee.api.ChatMessageType;
+import net.md_5.bungee.api.chat.TextComponent;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.scheduler.BukkitTask;
+
+public class TPSLimitCommand implements CommandExecutor {
+
+    private static double currentTPSLimit = 20;
+
+    private long lastTime = System.nanoTime();
+    private long currentTime = System.nanoTime();
+
+    private double delay = 0;
+    private int loops = 0;
+    private long sleepDelay = 0;
+
+    private BukkitTask tpsLimiter = null;
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
+        if (!(sender instanceof Player)) {
+            return false;
+        }
+        Player player = (Player) sender;
+        SteamwarUser user = SteamwarUser.get(player.getUniqueId());
+        if(!SpectateSystem.allowedGroups.contains(user.getUserGroup())){
+            player.sendMessage("§eSteam§8War» §cUnbekannter Befehl.");
+            return false;
+        }
+        if (!InspectCommand.inspecting) {
+            player.sendMessage("§eSteam§8War» §cNur für den Inspect mode.");
+            return false;
+        }
+        if (args.length == 0) {
+            sender.sendMessage("§eSteam§8War» §aJetziges TPS limit: " + currentTPSLimit);
+            sender.sendMessage("§eSteam§8War» §aÄndere das TPS limit mit: §8/§etpslimit §8[§7TPS§8|§edefault§8]");
+            return false;
+        }
+
+        String tpsLimit = args[0];
+        if (tpsLimit.equals("default")) {
+            currentTPSLimit = 20;
+            sendNewTPSLimitMessage();
+            tpsLimiter();
+            return false;
+        }
+
+        try {
+            double tpsLimitDouble = Double.parseDouble(tpsLimit.replace(',', '.'));
+            if (tpsLimitDouble < 0.5 || tpsLimitDouble > 20) {
+                sendInvalidArgumentMessage(player);
+                return false;
+            }
+            currentTPSLimit = tpsLimitDouble;
+            sendNewTPSLimitMessage();
+            tpsLimiter();
+        } catch (NumberFormatException e) {
+            sendInvalidArgumentMessage(player);
+        }
+
+        return false;
+    }
+
+    private void sendNewTPSLimitMessage() {
+        Bukkit.getOnlinePlayers().forEach(p -> p.spigot().sendMessage(ChatMessageType.ACTION_BAR, TextComponent.fromLegacyText("§eTPS limit auf " + currentTPSLimit + " gesetzt.")));
+    }
+
+    private void sendInvalidArgumentMessage(Player player) {
+        player.sendMessage("§eSteam§8War» §cNur Zahlen zwischen 0,5 und 20, und 'default' erlaubt.");
+    }
+
+    private void tpsLimiter() {
+        delay = 20 / currentTPSLimit;
+        loops = (int) Math.ceil(delay);
+        sleepDelay = (long) (50 * delay) / loops;
+
+        if (currentTPSLimit >= 20) {
+            if (tpsLimiter == null) return;
+            tpsLimiter.cancel();
+            tpsLimiter = null;
+        } else {
+            if (tpsLimiter != null) return;
+            tpsLimiter = Bukkit.getScheduler().runTaskTimer(SpectateSystem.get(), () -> {
+                for (int i = 0; i < loops; i++) {
+                    sleepUntilNextTick(sleepDelay);
+                }
+            }, 0, 1);
+        }
+    }
+
+    private void sleepUntilNextTick(long neededDelta) {
+        lastTime = currentTime;
+        currentTime = System.nanoTime();
+
+        long timeDelta = (currentTime - lastTime) / 1000000;
+        if (neededDelta - timeDelta < 0) return;
+
+        try {
+            Thread.sleep(neededDelta - timeDelta);
+            currentTime = System.nanoTime();
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
+}
diff --git a/src/plugin.yml b/src/plugin.yml
index 10295c1..1c8b2df 100644
--- a/src/plugin.yml
+++ b/src/plugin.yml
@@ -12,3 +12,4 @@ depend:
 commands:
   replay:
   inspect:
+  tpslimit: