rusteal 0.8.0

Rust bindings for Unreal Engine 5.8.2
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use bindings::core_ue::Object;
use bindings::engine::{
    Actor, ActorExt, ControllerExt, GameplayStatics, SubsystemBlueprintLibrary, WorldSubsystem,
};
use bindings::rusteal::RustealWorldSubsystem;
use rusteal_runtime::runtime::{RustealResult, SubclassOf, UObjectRef, UeClass};
use rusteal_runtime::{uclass, uclass_impl};

use crate::save_data::CheckpointSaveData;

pub const SLOT_NAME: &str = "SAVE";

#[uclass(parent = RustealWorldSubsystem)]
pub struct CheckpointSubsystem {
    #[uproperty(BlueprintReadOnly, category = "Checkpoint")]
    save: UObjectRef<CheckpointSaveData>,
}

#[uclass_impl]
impl CheckpointSubsystem {
    #[ufunction(Override)]
    fn receive_world_begin_play(&mut self) {
        self.load_game_data();

        if !self.respawn_player() {
            return;
        }

        log::info!("[Checkpoints] the player starts at the last spawn point");
    }

    #[ufunction(BlueprintCallable)]
    pub fn update_spawn_point(&mut self, spawn_point: UObjectRef<Actor>) {
        if let Err(e) = self.save_spawn_point(spawn_point) {
            log::warn!("[Checkpoints] cannot save the spawn point: {e}");
        }
    }

    #[ufunction(BlueprintCallable)]
    pub fn respawn_player(&mut self) -> bool {
        self.move_player_to_checkpoint().unwrap_or(false)
    }

    #[ufunction(BlueprintCallable)]
    pub fn clear_checkpoint(&mut self) {
        if let Ok(save) = CheckpointSaveData::from_obj(self.save()) {
            save.set_has_checkpoint(false);
            save.set_spawn_point(UObjectRef::null());
            GameplayStatics::save_game_to_slot(self.save().upcast_to(), SLOT_NAME, 0);
        }
    }

    #[ufunction(BlueprintPure)]
    pub fn has_checkpoint(&self) -> bool {
        CheckpointSaveData::from_obj(self.save())
            .is_ok_and(|save| save.has_checkpoint() && save.level_name() == self.level_name())
    }
}

impl CheckpointSubsystem {
    pub fn get(context: UObjectRef<Object>) -> RustealResult<Self> {
        let class = SubclassOf::<Self>::base().upcast_to::<WorldSubsystem>();
        Self::from_obj(SubsystemBlueprintLibrary::get_world_subsystem(
            context, class,
        ))
    }

    fn level_name(&self) -> String {
        GameplayStatics::get_current_level_name(self.as_ref().upcast_to(), Some(true))
    }

    fn load_game_data(&mut self) {
        let loaded = if GameplayStatics::does_save_game_exist(SLOT_NAME, 0) {
            GameplayStatics::load_game_from_slot(SLOT_NAME, 0).cast::<CheckpointSaveData>()
        } else {
            Err(rusteal_runtime::runtime::RustealError::null_argument())
        };

        let save = match loaded {
            Ok(save) => save,
            Err(_) => {
                let save = GameplayStatics::create_save_game_object(
                    SubclassOf::<CheckpointSaveData>::base().upcast(),
                );
                GameplayStatics::save_game_to_slot(save, SLOT_NAME, 0);
                save.cast::<CheckpointSaveData>().unwrap_or_default()
            }
        };

        self.set_save(save);
    }

    fn save_spawn_point(&mut self, spawn_point: UObjectRef<Actor>) -> RustealResult<()> {
        if !self.save().is_valid() {
            self.load_game_data();
        }

        let actor = spawn_point.checked()?;
        let save = CheckpointSaveData::from_obj(self.save())?;
        save.set_has_checkpoint(true);
        save.set_level_name(&self.level_name());
        save.set_location(&actor.k2_get_actor_location());
        save.set_rotation(&actor.k2_get_actor_rotation());
        save.set_spawn_point(spawn_point);

        GameplayStatics::save_game_to_slot(self.save().upcast_to(), SLOT_NAME, 0);
        Ok(())
    }

    fn move_player_to_checkpoint(&self) -> RustealResult<bool> {
        if !self.has_checkpoint() {
            return Ok(false);
        }

        let save = CheckpointSaveData::from_obj(self.save())?;
        let controller = GameplayStatics::get_player_controller(self.as_ref().upcast_to(), 0);
        let controller = controller.checked()?;
        let pawn = controller.k2_get_pawn().checked()?;

        pawn.k2_set_actor_location_and_rotation(&save.location(), &save.rotation(), false, true);
        controller.set_control_rotation(&save.rotation());
        Ok(true)
    }
}