Spawn In Bed

Source Code (Sorry, too lazy to put this on github lol)

using System;
using System.Collections.Generic;
using Vintagestory.API.Common;
using Vintagestory.API.Common.Entities;
using Vintagestory.API.Datastructures;
using Vintagestory.API.Server;

namespace YangBed
{
	public sealed class YangBedModSystem : ModSystem
	{
		private ICoreServerAPI sapi;
		private readonly Dictionary<string, Action> mountListenersByPlayerUid = new Dictionary<string, Action>();

		public override bool ShouldLoad(EnumAppSide forSide) { return forSide == EnumAppSide.Server; }

		public override void StartServerSide(ICoreServerAPI api)
		{
			sapi = api;

			sapi.Event.PlayerNowPlaying += OnPlayerNowPlaying;
			sapi.Event.PlayerDisconnect += OnPlayerDisconnect;
		}

		private void OnPlayerNowPlaying(IServerPlayer player)
		{
			if (player == null || player.Entity == null) return;

			UnregisterPlayer(player);
			string playerUid = player.PlayerUID;

			// Beds set tiredness.isSleeping via an enqueued task during mount, one-shot callback. No need to check anything each tick or something stupid like that.
			Action listener = () =>  { sapi.Event.RegisterCallback(_ => TrySetSpawnFromSleep(playerUid), 50); };

			mountListenersByPlayerUid[playerUid] = listener;
			player.Entity.WatchedAttributes.RegisterModifiedListener("mountedOn", listener);
		}

		private void OnPlayerDisconnect(IServerPlayer player) { if (player == null) return; UnregisterPlayer(player); }

		private void UnregisterPlayer(IServerPlayer player)
		{
			if (!mountListenersByPlayerUid.TryGetValue(player.PlayerUID, out Action listener)) return;

			player.Entity?.WatchedAttributes.UnregisterListener(listener);
			mountListenersByPlayerUid.Remove(player.PlayerUID);
		}

		private void TrySetSpawnFromSleep(string playerUid)
		{
			IServerPlayer player = sapi.World.PlayerByUid(playerUid) as IServerPlayer;
			if (player == null || player.Entity == null) return;

			EntityPlayer entity = player.Entity;
			if (entity.MountedOn == null || !IsSleeping(entity)) return;

			EntityPos seatPos = entity.MountedOn.SeatPosition ?? entity.Pos;
			player.SetSpawnPosition(new PlayerSpawnPos
			{
				x = (int)Math.Floor(seatPos.X),
				y = (int)Math.Ceiling(seatPos.InternalY),
				z = (int)Math.Floor(seatPos.Z),
				yaw = seatPos.Yaw,
				pitch = 0f,
				roll = 0f,
				RemainingUses = -1
			});

			player.SendIngameError("yangbed-confirm", "Re-spawn Point Set...");
		}

		private static bool IsSleeping(EntityPlayer entity)
		{
			ITreeAttribute tiredness = entity.WatchedAttributes.GetTreeAttribute("tiredness");
			return tiredness != null && tiredness.GetInt("isSleeping") > 0;
		}

		public override void Dispose()
		{
			if (sapi != null)
			{
				sapi.Event.PlayerNowPlaying -= OnPlayerNowPlaying;
				sapi.Event.PlayerDisconnect -= OnPlayerDisconnect;
				foreach (IPlayer player in sapi.World.AllOnlinePlayers) { if (player is IServerPlayer serverPlayer) { UnregisterPlayer(serverPlayer); } }
			}

			mountListenersByPlayerUid.Clear();
			base.Dispose();
		}
	}
}