From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Ivan Pekov <ivan@mrivanplays.com>
Date: Sun, 27 Sep 2020 18:30:10 +0300
Subject: [PATCH] Add last tick time API

Original patch by:
Co-authored-by: tr7zw <tr7zw@live.de>

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 662a005becd1d2642ae50c25fdf3bfadf7ae6ae2..21a0656ce8a44acf45a1756add556a5c71e3eeb7 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -935,6 +935,8 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
     // Paper End
     // Spigot End
 
+    public static java.time.Duration lastTickTime = java.time.Duration.ZERO; // Yatopia
+
     protected void w() {
         try {
             long serverStartTime = SystemUtils.getMonotonicNanos(); // Paper
@@ -1003,7 +1005,9 @@ public abstract class MinecraftServer extends IAsyncTaskHandlerReentrant<TickTas
                     this.a(gameprofilertick);
                     //this.methodProfiler.a(); // Akarin - remove caller
                     //this.methodProfiler.enter("tick"); // Akarin - remove caller
+                    long tickStart = System.nanoTime(); // Yatopia
                     this.a(this::canSleepForTick);
+                    lastTickTime = java.time.Duration.ofNanos(System.nanoTime() - tickStart); // Yatopia
                     //this.methodProfiler.exitEnter("nextTickWait"); // Akarin - remove caller
                     this.X = true;
                     this.W = Math.max(SystemUtils.getMonotonicMillis() + 50L, this.nextTick);
diff --git a/src/main/java/net/yatopia/server/TimeUtils.java b/src/main/java/net/yatopia/server/TimeUtils.java
new file mode 100644
index 0000000000000000000000000000000000000000..b506aaeab4ad997b83d3aa6daaab6eea52a08568
--- /dev/null
+++ b/src/main/java/net/yatopia/server/TimeUtils.java
@@ -0,0 +1,27 @@
+package net.yatopia.server;
+
+import java.util.concurrent.TimeUnit;
+
+public class TimeUtils {
+
+    public static String getFriendlyName(TimeUnit unit) {
+        switch (unit) {
+            case NANOSECONDS:
+                return "ns";
+            case MILLISECONDS:
+                return "ms";
+            case MICROSECONDS:
+                return "micros";
+            case SECONDS:
+                return "s";
+            case MINUTES:
+                return "m";
+            case DAYS:
+                return "d";
+            case HOURS:
+                return "h";
+            default:
+                throw new AssertionError();
+        }
+    }
+}
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 7277919e1cc5ee8f8fead434a1a33c9008c1618e..0645185e2d73f7001a07a9f5c8461da71b1327d5 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -2432,4 +2432,6 @@ public final class CraftServer implements Server {
         return getServer().lagging;
     }
     // Purpur end
+
+    @Override public java.time.Duration getLastTickTime() { return net.minecraft.server.MinecraftServer.lastTickTime; } // Yatopia
 }
diff --git a/src/main/java/org/spigotmc/TicksPerSecondCommand.java b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
index 3c7b9a6d24e064f9c1ec5fb6d52f42627944d7fa..8e930bdd6a88806b8857bc73f93ec296f47bd4c3 100644
--- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java
+++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
@@ -34,6 +34,11 @@ public class TicksPerSecondCommand extends Command
             tpsAvg[i] = format( tps[i] );
         }
         sender.sendMessage(ChatColor.GOLD + "TPS from last 5s, 1m, 5m, 15m: " + org.apache.commons.lang.StringUtils.join(tpsAvg, ", ")); // Purpur
+        // Yatopia start
+        java.time.Duration lastTickTime = org.bukkit.Bukkit.getLastTickTime();
+        sender.sendMessage(ChatColor.GOLD + "Last tick: " + formatTo( lastTickTime, java.util.concurrent.TimeUnit.MILLISECONDS ) + " (" + formatTo( lastTickTime, java.util.concurrent.TimeUnit.NANOSECONDS ) + ")");
+        sender.sendMessage( ChatColor.GOLD + "Lagging: " + ( org.bukkit.Bukkit.isLagging() ? ChatColor.RED + "Yes" : ChatColor.GREEN + "No" ));
+        // Yatopia end
         if (args.length > 0 && args[0].equals("mem") && sender.hasPermission("bukkit.command.tpsmemory")) {
             sender.sendMessage(ChatColor.GOLD + "Current Memory Usage: " + ChatColor.GREEN + ((Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / (1024 * 1024)) + "/" + (Runtime.getRuntime().totalMemory() / (1024 * 1024)) + " mb (Max: " + (Runtime.getRuntime().maxMemory() / (1024 * 1024)) + " mb)");
             if (!hasShownMemoryWarning) {
@@ -52,4 +57,16 @@ public class TicksPerSecondCommand extends Command
         return ( ( tps > 18.0 ) ? ChatColor.GREEN : ( tps > 16.0 ) ? ChatColor.YELLOW : ChatColor.RED ).toString()
                 + ( ( tps > 21.0 ) ? "*" : "" ) + Math.min( Math.round( tps * 100.0 ) / 100.0, 20.0 ); // Paper - only print * at 21, we commonly peak to 20.02 as the tick sleep is not accurate enough, stop the noise
     }
+
+    // Yatopia start
+    public static String formatTo(java.time.Duration duration, java.util.concurrent.TimeUnit unit)
+    {
+        java.util.concurrent.TimeUnit nanosUnit = java.util.concurrent.TimeUnit.NANOSECONDS;
+        long nanos = duration.toNanos();
+        long toAskedUnit = unit.convert( nanos, nanosUnit );
+        long ms = nanosUnit.toMillis( nanos );
+        ChatColor startingColor = ms < 40 ? ChatColor.GREEN : ( ms < 50 ) ? ChatColor.YELLOW : ChatColor.RED;
+        return startingColor.toString() + toAskedUnit + ChatColor.GOLD + net.yatopia.server.TimeUtils.getFriendlyName( unit );
+    }
+    // Yatopia end
 }