From 84a9db597a38ba1f2b39d62dad901735e3fca88f Mon Sep 17 00:00:00 2001
From: benwoo1110 <30431861+benwoo1110@users.noreply.github.com>
Date: Fri, 19 Feb 2021 00:57:19 +0800
Subject: [PATCH] Add respawn anchor support.

---
 .../MultiverseCore/MultiverseCore.java        |  3 ++
 .../MultiverseCore/enums/RespawnType.java     |  7 +++
 .../listeners/MVPlayerListener.java           | 13 +++++-
 .../utils/CompatibilityLayer.java             | 46 +++++++++++++++++++
 4 files changed, 67 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/com/onarandombox/MultiverseCore/enums/RespawnType.java
 create mode 100644 src/main/java/com/onarandombox/MultiverseCore/utils/CompatibilityLayer.java

diff --git a/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java b/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
index 4af01ad6..94521888 100644
--- a/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
+++ b/src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java
@@ -88,6 +88,7 @@ import com.onarandombox.MultiverseCore.listeners.MVWeatherListener;
 import com.onarandombox.MultiverseCore.listeners.MVWorldInitListener;
 import com.onarandombox.MultiverseCore.listeners.MVWorldListener;
 import com.onarandombox.MultiverseCore.utils.AnchorManager;
+import com.onarandombox.MultiverseCore.utils.CompatibilityLayer;
 import com.onarandombox.MultiverseCore.utils.MVEconomist;
 import com.onarandombox.MultiverseCore.utils.MVMessaging;
 import com.onarandombox.MultiverseCore.utils.MVPermissions;
@@ -254,6 +255,8 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
         // Setup our SafeTTeleporter
         this.safeTTeleporter = new SimpleSafeTTeleporter(this);
         this.unsafeCallWrapper = new UnsafeCallWrapper(this);
+        // Setup our CompatibilityLayer
+        CompatibilityLayer.init();
     }
 
 
diff --git a/src/main/java/com/onarandombox/MultiverseCore/enums/RespawnType.java b/src/main/java/com/onarandombox/MultiverseCore/enums/RespawnType.java
new file mode 100644
index 00000000..889f0e43
--- /dev/null
+++ b/src/main/java/com/onarandombox/MultiverseCore/enums/RespawnType.java
@@ -0,0 +1,7 @@
+package com.onarandombox.MultiverseCore.enums;
+
+public enum RespawnType {
+    BED,
+    ANCHOR,
+    OTHER
+}
diff --git a/src/main/java/com/onarandombox/MultiverseCore/listeners/MVPlayerListener.java b/src/main/java/com/onarandombox/MultiverseCore/listeners/MVPlayerListener.java
index 853ed55d..fc92292f 100644
--- a/src/main/java/com/onarandombox/MultiverseCore/listeners/MVPlayerListener.java
+++ b/src/main/java/com/onarandombox/MultiverseCore/listeners/MVPlayerListener.java
@@ -15,7 +15,9 @@ import com.dumptruckman.minecraft.util.Logging;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.api.MVWorldManager;
 import com.onarandombox.MultiverseCore.api.MultiverseWorld;
+import com.onarandombox.MultiverseCore.enums.RespawnType;
 import com.onarandombox.MultiverseCore.event.MVRespawnEvent;
+import com.onarandombox.MultiverseCore.utils.CompatibilityLayer;
 import com.onarandombox.MultiverseCore.utils.PermissionTools;
 import org.bukkit.GameMode;
 import org.bukkit.Location;
@@ -69,9 +71,16 @@ public class MVPlayerListener implements Listener {
             return;
         }
 
+        RespawnType respawnType = RespawnType.OTHER;
+        if (event.isBedSpawn()) {
+            respawnType = RespawnType.BED;
+        }
+        if (CompatibilityLayer.isAnchorSpawn(event)) {
+            respawnType = RespawnType.ANCHOR;
+        }
 
-        if (mvWorld.getBedRespawn() && event.isBedSpawn()) {
-            Logging.fine("Spawning " + event.getPlayer().getName() + " at their bed");
+        if (mvWorld.getBedRespawn() && (respawnType == RespawnType.BED || respawnType == RespawnType.ANCHOR)) {
+            Logging.fine("Spawning %s at their %s", event.getPlayer().getName(), respawnType);
             return;
         }
 
diff --git a/src/main/java/com/onarandombox/MultiverseCore/utils/CompatibilityLayer.java b/src/main/java/com/onarandombox/MultiverseCore/utils/CompatibilityLayer.java
new file mode 100644
index 00000000..4d223cce
--- /dev/null
+++ b/src/main/java/com/onarandombox/MultiverseCore/utils/CompatibilityLayer.java
@@ -0,0 +1,46 @@
+package com.onarandombox.MultiverseCore.utils;
+
+import com.dumptruckman.minecraft.util.Logging;
+import org.bukkit.Bukkit;
+import org.bukkit.event.player.PlayerRespawnEvent;
+
+import java.lang.reflect.Method;
+
+/**
+ * A utility class to enable version specific minecraft features.
+ */
+public class CompatibilityLayer {
+
+    private static Method checkAnchorSpawn;
+
+    /**
+     * Initialise the reflection methods.
+     */
+    public static void init() {
+        try {
+            checkAnchorSpawn = PlayerRespawnEvent.class.getDeclaredMethod("isAnchorSpawn");
+        } catch (NoSuchMethodException e) {
+            Logging.fine("%s does not support respawn anchors.", Bukkit.getVersion());
+        }
+    }
+
+    /**
+     * Check if the respawn point is of respawn anchor type.
+     * Introduced in minecraft 1.16
+     *
+     * @param event A player respawn event.
+     * @return If the respawn location is an anchor point.
+     */
+    public static boolean isAnchorSpawn(PlayerRespawnEvent event) {
+        if (checkAnchorSpawn == null) {
+            return false;
+        }
+        try {
+            return (boolean) checkAnchorSpawn.invoke(event);
+        } catch (Exception e) {
+            Logging.warning("Error checking for: %s", checkAnchorSpawn);
+            e.printStackTrace();
+        }
+        return false;
+    }
+}
\ No newline at end of file