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====== Activities ======

This is summary of how to add stuff for villagers to do. [[https://github.com/EmmanuelMess/ReligiousVillagersMinecraftMod|Here]] is the repo with the full code. The accessors are not explained here, they are at [[tutorial:mixin_accessors|Mixin Accessors]].
An activity is a set of tasks.
First register the activity:

<code java [enable_line_numbers="true"]>
    public static final Activity PRAY = Activity.register("pray");
</code>



Then create a task:

<code java [enable_line_numbers="true"]>
public class FindTempleTask extends Task<VillagerEntity> {
    public FindTempleTask() {
        super(ImmutableMap.of(ReligiousVillagersMod.MOSQUE_POINT, MemoryModuleState.VALUE_ABSENT));//Conditions to be met to start the task
    }

    protected boolean shouldRun(ServerWorld world, VillagerEntity entity) {
        return world.getPointOfInterestStorage()
                .getNearestPosition(
                        ReligiousVillagersMod.BELIEVER.getCompletionCondition(),
                        entity.getBlockPos(),
                        48,
                        PointOfInterestStorage.OccupationStatus.ANY
                ).isPresent();
    }

    protected void run(ServerWorld world, VillagerEntity entity, long time) {
        ReligiousVillagersMod.LOGGER.info("FindTemple:run!");

        world.getPointOfInterestStorage()
                .getPositions(
                        ReligiousVillagersMod.BELIEVER.getCompletionCondition(),
                        (blockPos) -> {
                            Path path = entity
                                    .getNavigation()
                                    .findPathTo(blockPos, ReligiousVillagersMod.BELIEVER.getSearchDistance());
                            return (path != null && path.reachesTarget());
                        },
                        entity.getBlockPos(),
                        48,
                        PointOfInterestStorage.OccupationStatus.ANY
                )
                .findAny()
                .ifPresent(blockPos -> {
                    GlobalPos globalPos = GlobalPos.create(world.getRegistryKey(), blockPos);
                    entity.getBrain().remember(ReligiousVillagersMod.MOSQUE_POINT, globalPos);
                });
    }
}
</code>

This task just finds a ReligiousVillagersMod.MOSQUE_POINT:

<code java [enable_line_numbers="true"]>
	public static final MemoryModuleType<GlobalPos> MOSQUE_POINT = MemoryModuleType.register(
			"mosque_point",
			GlobalPos.CODEC
	);
</code>

The mosque point is a point of interest (like work benches, or a home):

<code java [enable_line_numbers="true"]>
        static {
	       public static final PointOfInterestType BELIEVER = PointOfInterestType.register(
                                "believer", PointOfInterestType.getAllStatesOf(Blocks.EMERALD_BLOCK), 32, 100
	       );
        
               addPointsOfInterest();
        }

        private static void addPointsOfInterest() {
		VillagerEntityAccessor.setPointsOfInterest(
				new ImmutableMap.Builder<MemoryModuleType<GlobalPos>, BiPredicate<VillagerEntity, PointOfInterestType>>()
						.putAll(VillagerEntity.POINTS_OF_INTEREST)
						.put(MOSQUE_POINT, (villagerEntity, pointOfInterestType) -> pointOfInterestType == BELIEVER)
						.build());
	}
</code>

The position is saved in a memory module:

<code java [enable_line_numbers="true"]>
VillagerEntityAccessor.setMemoryModules(new ImmutableList.Builder<MemoryModuleType<?>>()
				.addAll(VillagerEntityAccessor.getMemoryModules()).add(MOSQUE_POINT).build());
</code>

Once you have a task, you can create a set of tasks (aka Activity):

<code java [enable_line_numbers="true"]>
	public static ImmutableList<Pair<Integer, ? extends Task<? super VillagerEntity>>> createPrayTasks(float speed) {
		return ImmutableList.of(
				Pair.of(1, new FindTempleTask()),
				Pair.of(2, new VillagerWalkTowardsTask(
						MOSQUE_POINT, speed, 1, 150, 1200//info about how to do the task
				)),
				Pair.of(3, new ForgetCompletedPointOfInterestTask(BELIEVER, MOSQUE_POINT)),
				Pair.of(3, new PrayVillagerTask()),//Another task, remove it if you dont want it.
				Pair.of(99, new ScheduleActivityTask())
		);
	}
</code>

Then, you need to add the activity to their brain:


<code java [enable_line_numbers="true"]>
@Mixin(VillagerEntity.class)
public class VillagerEntityMixin {
	@Inject(at = @At("HEAD"), method = "initBrain(Lnet/minecraft/entity/ai/brain/Brain;)V", locals = LocalCapture.CAPTURE_FAILEXCEPTION)
	private void initBrain(Brain<VillagerEntity> brain, CallbackInfo info) {
		VillagerEntity $this = (VillagerEntity) (Object) this;

		if (!$this.isBaby()) {
			brain.setTaskList(
					ReligiousVillagersMod.PRAY,
					createPrayTasks(0.75F)
			);
		}
	}
}
</code>

And to their schedule:


<code java [enable_line_numbers="true"]>
	static {
		addScheduled();
	}

	private static void addScheduled() {
		ScheduleAccessor.setVillagerDefault(
				new ScheduleBuilder(Schedule.VILLAGER_DEFAULT).withActivity(10, ReligiousVillagersMod.PRAY).build());//10 is the start time
	}
</code>

If all went well and you have all the accessors, you should be able to put down an emerald block inside a village and villagers will pray before work:

{{ :unknown.png?nolink&400 |}}