use super::*;

pub(crate) struct BaseUiPlugin;

impl Plugin for BaseUiPlugin {
    fn build(&self, app: &mut App) {
        // TODO
    }
}

/// Marker component for handling Resource -> Ui Sync
#[derive(Component, Default, Debug)]
pub struct SyncResource<R: Resource + Default + Display>(R);

/// Sync a generic resource to the UI
///
/// Mostly useful for quick n' dirty getting data to the user
pub fn sync_resource_to_ui<R: Resource + Default + Display>(
    mut q: Query<&mut Text, With<SyncResource<R>>>,
    r: Res<R>,
) {
    q.iter_mut().for_each(|mut t| {
        t.0 = format!("{}", *r);
    });
}

/// Updates the scroll position of scrollable nodes in response to mouse input
pub fn scroll(trigger: Trigger<Pointer<Scroll>>, mut scrollers: Query<&mut ScrollPosition>) {
    let Pointer {
        event: Scroll { unit, x, y, .. },
        ..
    } = trigger.event();

    let (dx, dy) = match unit {
        MouseScrollUnit::Line => (x * 16.0, y * 16.0),
        MouseScrollUnit::Pixel => (x * 1., y * 1.),
    };

    if let Ok(mut pos) = scrollers.get_mut(trigger.target()) {
        pos.offset_x -= dx;
        pos.offset_y -= dy;
    }
}

#[derive(Component, Debug)]
#[relationship(relationship_target = NavParent)]
pub(crate) struct NavChild(Entity);

#[derive(Component, Debug)]
#[relationship_target(relationship = NavChild)]
pub(crate) struct NavParent(Vec<Entity>);