Adjust the bed command so that teleportation follows the respawn stra…

…tegy. (#286)

src/main/java/com/fibermc/essentialcommands/commands/BedCommand.java

@@ -9,22 +9,66 @@
 import com.mojang.brigadier.context.CommandContext;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 
+import net.minecraft.block.BedBlock;
+import net.minecraft.block.Block;
+import net.minecraft.block.BlockState;
+import net.minecraft.block.RespawnAnchorBlock;
+import net.minecraft.entity.EntityType;
 import net.minecraft.command.CommandException;
 import net.minecraft.server.command.ServerCommandSource;
+import net.minecraft.util.math.Direction;
+import net.minecraft.util.math.Vec3d;
+
+import java.util.Objects;
+import java.util.Optional;
 
 public class BedCommand implements Command<ServerCommandSource> {
     @Override
     public int run(CommandContext<ServerCommandSource> context) throws CommandSyntaxException {
         var player = context.getSource().getPlayerOrThrow();
         var spawnPos = player.getSpawnPointPosition();
         var spawnDim = player.getSpawnPointDimension();
+        var spawnAngle = player.getSpawnAngle();
 
         if (spawnPos == null) {
             throw new CommandException(ECText.access(player).getText("cmd.bed.error.none_set", TextFormatType.Error));
         }
+
+        var world = Objects.requireNonNull(player.getServer()).getWorld(spawnDim);
+
+        if (world == null) {
+            throw new IllegalStateException(String.format(
+                "could not resolve the ServerWorld corresponding to the player's spawn dimension. dimension: '%s'",
+                spawnDim.getValue())
+            );
+        }
+
+        //Safe Position Calculation, based on the game respawn position calculation logic,
+        //which was basically rewritten because the game code caused the state of the RespawnAnchorBlock to be refreshed.
+        Vec3d safeSpawnPos;
+        BlockState blockState = world.getBlockState(spawnPos);
+        Block block = blockState.getBlock();
+        if (block instanceof RespawnAnchorBlock
+            && (Integer)blockState.get(RespawnAnchorBlock.CHARGES) > 0 && RespawnAnchorBlock.isNether(world)) {
+            Optional<Vec3d> optional = RespawnAnchorBlock.findRespawnPosition(EntityType.PLAYER, world, spawnPos);
+            safeSpawnPos = optional.orElseGet(() -> new Vec3d((double)spawnPos.getX() + 0.5, (double)spawnPos.getY() + 1, (double)spawnPos.getZ() + 0.5));
+        } else if (block instanceof BedBlock && BedBlock.isBedWorking(world)) {
+            Optional<Vec3d> optional =  BedBlock.findWakeUpPosition(EntityType.PLAYER, world, spawnPos, (Direction)blockState.get(BedBlock.FACING), spawnAngle);
+            safeSpawnPos = optional.orElseGet(() -> new Vec3d((double)spawnPos.getX() + 0.5, (double)spawnPos.getY() + 0.5625, (double)spawnPos.getZ() + 0.5));
+        } else {
+            boolean bl = block.canMobSpawnInside(blockState);
+            BlockState blockState2 = world.getBlockState(spawnPos.up());
+            boolean bl2 = blockState2.getBlock().canMobSpawnInside(blockState2);
+            if(bl && bl2) {
+                safeSpawnPos = new Vec3d((double)spawnPos.getX() + 0.5, (double)spawnPos.getY() + 0.1, (double)spawnPos.getZ() + 0.5);
+            }else{
+                safeSpawnPos = Vec3d.ofBottomCenter(spawnPos);
+            }
+        }
+
         PlayerTeleporter.requestTeleport(
             player,
-            new MinecraftLocation(spawnDim, spawnPos.getX(), spawnPos.getY(), spawnPos.getZ()),
+            new MinecraftLocation(spawnDim, safeSpawnPos.getX(), safeSpawnPos.getY(), safeSpawnPos.getZ()),
             ECText.access(player).getText("cmd.bed.bed_destination_name", TextFormatType.Accent));
 
         return 0;