use bevy_app::prelude::*;
use settled_reach_server::simulation::movement::*;
use settled_reach_server::simulation::time::SimulationTime;
use settled_reach_server::simulation::SimulationPlugin;

#[test]
fn movement_validated_within_app() {
    let mut app = App::new();
    app.add_plugins(SimulationPlugin { seed: 0 });

    // Insert a walkability map with one blocked tile
    let mut map = WalkabilityMap::new(10, 10, 1);
    map.set_walkable(&TilePosition::new(3, 3, 0), false);
    app.insert_resource(map);

    // Spawn mover (walkable target) and blocked entity
    let mover = app
        .world_mut()
        .spawn((
            TilePosition::new(5, 5, 0),
            MoveIntent {
                target: TilePosition::new(5, 4, 0),
            },
        ))
        .id();

    let blocked = app
        .world_mut()
        .spawn((
            TilePosition::new(3, 4, 0),
            MoveIntent {
                target: TilePosition::new(3, 3, 0),
            },
        ))
        .id();

    app.update();

    // Mover moved
    assert_eq!(
        *app.world().get::<TilePosition>(mover).unwrap(),
        TilePosition::new(5, 4, 0)
    );
    // Blocked stayed
    assert_eq!(
        *app.world().get::<TilePosition>(blocked).unwrap(),
        TilePosition::new(3, 4, 0)
    );
    // Tick advanced
    assert_eq!(app.world().resource::<SimulationTime>().tick, 1);
    // Both intents consumed
    assert!(app.world().get::<MoveIntent>(mover).is_none());
    assert!(app.world().get::<MoveIntent>(blocked).is_none());
}

#[test]
fn entity_collision_blocks_movement() {
    let mut app = App::new();
    app.add_plugins(SimulationPlugin { seed: 0 });
    app.insert_resource(WalkabilityMap::new(10, 10, 1));

    // Stationary entity at (5,4)
    app.world_mut().spawn(TilePosition::new(5, 4, 0));

    // Mover tries to move into occupied tile
    let mover = app
        .world_mut()
        .spawn((
            TilePosition::new(5, 5, 0),
            MoveIntent {
                target: TilePosition::new(5, 4, 0),
            },
        ))
        .id();

    app.update();

    assert_eq!(
        *app.world().get::<TilePosition>(mover).unwrap(),
        TilePosition::new(5, 5, 0)
    );
}