use crate::prelude::*;

/// Menu Plugin; empty struct for Plugin impl
pub(crate) struct UiPlugin;

impl Plugin for UiPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(
            Update,
            button_interaction.run_if(any_component_changed::<Interaction>),
        );
    }
}

fn button_interaction(mut query: Query<(&mut BackgroundColor, &Interaction)>) {
    query.iter_mut().for_each(|(mut bg, i)| match i {
        Interaction::Hovered => bg.0 = Color::ORANGE,
        Interaction::Pressed => bg.0 = Color::GREEN,
        Interaction::None => bg.0 = Color::WHITE,
    });
}

pub(crate) mod button {
    use super::*;

    pub(crate) struct UiButton {
        pub label: &'static str,
    }

    impl EntityCommand for UiButton {
        fn apply(self, id: Entity, world: &mut World) {
            let button_text_style = TextStyle {
                color: Color::BLACK,
                font_size: 16.0,
                ..default()
            };
            world
                .entity_mut(id)
                .insert(ButtonBundle {
                    style: Style {
                        margin: UiRect::all(Val::Px(5.0)),
                        padding: UiRect::all(Val::Px(5.0)),
                        border: UiRect::all(Val::Px(1.0)),
                        ..default()
                    },
                    border_color: BorderColor(Color::BLACK),
                    ..default()
                })
                .with_children(|parent| {
                    parent.spawn(TextBundle {
                        text: Text::from_section(self.label, button_text_style),
                        ..default()
                    });
                });
        }
    }
}