bevy-expedition-demo/src/layout/systems.rs

use bevy::{
    ecs::query::QueryFilter,
    prelude::*,
};

use bevy_rapier2d::prelude::*;

use crate::{
    meters,
    item::lockpick::lockpick_bundle,
    player::{
        Player,
        player_bundle,
    },
};

use super::*;

fn get_interactive_id<F: QueryFilter>(
    tested_id: Entity,
    interactive_query: Query<(), F>,
    parent_query: Query<&ChildOf, With<Collider>>,
) -> Option<Entity> {
    if interactive_query.get(tested_id).is_ok() {
        return Some(tested_id);
    }
    let Ok(parent_id) = parent_query.get(tested_id) else {
        return None;
    };
    match interactive_query.get(parent_id.0) {
        Ok(_) => Some(parent_id.0),
        Err(_) => None,
    }
}

pub fn detect_interact_collisions(
    mut commands: Commands,
    mut collision_events: MessageReader<CollisionEvent>,
    player_query: Query<(), With<Player>>,
    interactive_query1: Query<(), (With<InteractiveObject>, Without<MayInteract>)>,
    interactive_query2: Query<(), (With<InteractiveObject>, With<MayInteract>)>,
    parent_query: Query<&ChildOf, With<Collider>>,
) {
    for collision_event in collision_events.read() {
        match collision_event {
            CollisionEvent::Started(first, second, _) => {
                let Some(interactive_id) = get_interactive_id(*first, interactive_query1, parent_query) else {
                    continue;
                };
                if player_query.get(*second).is_err() {
                    continue;
                }
                commands.entity(interactive_id).insert(MayInteract);
            },
            CollisionEvent::Stopped(first, second, _) => {
                let Some(interactive_id) = get_interactive_id(*first, interactive_query2, parent_query) else {
                    continue;
                };
                if player_query.get(*second).is_err() {
                    continue;
                }
                commands.entity(interactive_id).remove::<MayInteract>();
            },
        }
    }
}

pub fn lock_door(
    mut commands: Commands,
    query: Query<&ChildOf, Added<lock::Padlock>>,
) {
    for parent in query {
        commands.entity(parent.0).insert(Locked);
    }
}

pub fn setup_world(
    mut commands: Commands,
    asset_server: Res<AssetServer>,
) {
    let tiles = [
        ( 0, ( 0, 0, 16, 1 )), // 1F floor
        ( 0, ( 0, 4, 16, 1 )), // 1F ceiling / 2F floor
        ( 0, ( 0, 8, 16, 1 )), // 2F ceiling
        
        ( 1, ( 0, 1, 1, 3 )),  // 1F left wall
        ( 1, ( 0, 5, 1, 3 )),  // 2F left wall
        ( 1, ( 15, 1, 1, 3 )), // 1F right wall
        ( 1, ( 15, 5, 1, 3 )), // 2F right wall
        
        ( 2, ( 4, 3, 1, 1 )),  // 1F left door connector
        ( 2, ( 4, 7, 1, 1 )),  // 2F left door connector
        ( 2, ( 11, 3, 1, 1 )), // 1F right door connector
        ( 2, ( 11, 7, 1, 1 )), // 2F right door connector
    ].into_iter().map(|(id, (x, y, w, h))| {
        (id, URect::from_corners(uvec2(x, y), uvec2(x + w - 1, y + h - 1)))
    }).collect::<Vec<(u16, URect)>>();
    
    commands.spawn(tilemap::tilemap_bundle(&asset_server, tiles));

    commands.spawn(player_bundle(&asset_server, vec2(meters(1.5), meters(1.))));

    commands.spawn(door::door_bundle(&asset_server, vec2(meters(4.5), meters(1.)), false));
    commands.spawn(door::door_bundle(&asset_server, vec2(meters(4.5), meters(5.)), false))
        .with_child(lock::padlock_bundle(&asset_server, false));
    commands.spawn(door::door_bundle(&asset_server, vec2(meters(11.5), meters(1.)), true))
        .with_child(lock::padlock_bundle(&asset_server, true));
    commands.spawn(door::door_bundle(&asset_server, vec2(meters(11.5), meters(5.)), true));

    commands.spawn(stairs::stairs_bundle(
        &asset_server,
        vec2(meters(8.), meters(1.)),
        Some(vec2(meters(2.), meters(4.))),
        None,
    ));
    commands.spawn(stairs::stairs_bundle(
        &asset_server,
        vec2(meters(8.), meters(5.)),
        None,
        Some(vec2(meters(-2.), meters(-4.))),
    ));

    commands.spawn(container::container_bundle(
        &asset_server,
        vec2(meters(2.), meters(1.)),
        uvec2(1, 1),
    ));
    commands.spawn(container::container_bundle(
        &asset_server,
        vec2(meters(14.), meters(1.)),
        uvec2(1, 1),
    ));
    commands.spawn(container::container_bundle(
        &asset_server,
        vec2(meters(2.), meters(5.)),
        uvec2(4, 4),
    )).with_child(lockpick_bundle(&asset_server, uvec2(2, 2), false));
    commands.spawn(container::container_bundle(
        &asset_server,
        vec2(meters(14.), meters(5.)),
        uvec2(2, 2),
    )).with_child(lockpick_bundle(&asset_server, UVec2::ZERO, true));
}