use super::*;

/// Debugging systems, resources, events, etc.
pub struct DebuggingPlugin;

impl Plugin for DebuggingPlugin {
    fn build(&self, app: &mut App) {
        app.init_state::<DebuggingState>()
            .add_systems(Startup, init_debug_ui)
            .add_systems(Update, (
                toggle_state_visibility::<DebuggingState>.run_if(state_changed::<DebuggingState>),
                toggle_debug_state.run_if(on_keyboard_press(KeyCode::F12))
            ));
    }
}

/// Tracks if the debugger is on or off for other games systems to hook into
///
/// The Debugging state may add it's own global debugging information, but is mostly a shell
#[derive(States, Component, Default, Debug, Clone, Hash, Eq, PartialEq)]
pub enum DebuggingState {
    #[default]
    Off,
    On,
}

/// Toggles the debug state from off -> on // off -> on when triggered
fn toggle_debug_state(
    mut next: ResMut<NextState<DebuggingState>>,
    curr: Res<State<DebuggingState>>,
) {
    use DebuggingState::*;

    next.set(match curr.get() {
        On => Off,
        Off => On,
    });
    debug!("Toggling debug state: {:?} -> {:?}", curr, next);
}

/// Create the Debugging UI
fn init_debug_ui(
    mut commands: Commands
) {
    commands.spawn((
        DebuggingState::On,
        Text(" Debug: ON ".into()),
        TextColor(WHITE.into()),
        BackgroundColor(RED.into()),
        BorderRadius::MAX,
        Node {
            align_self: AlignSelf::Center,
            justify_self: JustifySelf::End,
            ..default()
        }
    ));
}