use std::time::Duration;

use bevy::prelude::*;
use bevy_bsml::prelude::*;

#[derive(Debug, Clone, Default, Component)]
pub struct LoadingBar;

#[derive(Debug, Clone, Component)]
pub struct LoadPerc {
    pub timer: Timer,
}

impl Default for LoadPerc {
    fn default() -> Self {
        Self {
            timer: Timer::new(Duration::from_secs(5), TimerMode::Once),
        }
    }
}

bsml! {LoadingBar;
    (node
        class=[w(300.0), h(30.0), BG_SLATE_400]
    ) {
        (node
            labels=[LoadPerc::default()]
            class=[w_fract(0.0), H_FULL, BG_BLUE_400]
        )
    }
}

fn loading_bar_system(mut query: Query<(&mut LoadPerc, &mut BsmlClasses)>, time: Res<Time>) {
    let (mut loaded, mut classes) = query.single_mut();
    loaded.timer.tick(time.delta());

    if loaded.timer.just_finished() {
        classes.insert(Interaction::None, w_fract(1.0));
    } else if !loaded.timer.finished() {
        classes.insert(Interaction::None, w_fract(loaded.timer.fraction()));
    }
}

fn spawn_ui(mut commands: Commands) {
    commands.spawn_bsml(bsml!(
        (node class=[W_FULL, H_FULL, JUSTIFY_CENTER, ITEMS_CENTER, BG_TRANSPARENT]) {
            (LoadingBar)
        }
    ));
}

fn setup(mut commands: Commands) {
    commands.spawn(Camera2dBundle::default());
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugins(BsmlPlugin)
        .add_systems(Startup, setup)
        .add_systems(Startup, spawn_ui)
        .add_systems(Update, loading_bar_system)
        .add_systems(Update, close_on_esc)
        .run();
}

fn close_on_esc(
    mut commands: Commands,
    focused_windows: Query<(Entity, &Window)>,
    input: Res<ButtonInput<KeyCode>>,
) {
    for (window, focus) in focused_windows.iter() {
        if !focus.focused {
            continue;
        }

        if input.just_pressed(KeyCode::Escape) {
            commands.entity(window).despawn();
        }
    }
}