use crate::settings;
use bevy::prelude::*;
use bevy::diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin};

pub struct OutFlyHudPlugin;
impl Plugin for OutFlyHudPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(Startup, setup);
        app.add_systems(Update, (update, handle_input));
        app.insert_resource(FPSUpdateTimer(Timer::from_seconds(0.25, TimerMode::Repeating)));
    }
}

const FONT: &str = "tmp/fonts/NotoSansSC-Thin.ttf";

#[derive(Component)]
struct FpsText;

#[derive(Resource)]
struct FPSUpdateTimer(Timer);

fn setup(
    mut commands: Commands,
    settings: Res<settings::Settings>,
    asset_server: Res<AssetServer>,
) {
    let visibility = if settings.ar_active {
        Visibility::Inherited
    } else {
        Visibility::Hidden
    };
    let mut bundle_fps = TextBundle::from_sections([
        TextSection::new(
            "  帧率 ",
            TextStyle {
                font: asset_server.load(FONT),
                font_size: settings.font_size_hud,
                color: Color::GRAY,
                ..default()
            },
        ),
        TextSection::new(
            "",
            TextStyle {
                font: asset_server.load(FONT),
                font_size: settings.font_size_hud,
                color: Color::GRAY,
                ..default()
            }
        ),
    ]);
    bundle_fps.visibility = visibility;
    commands.spawn((
        bundle_fps,
        FpsText,
    ));
}

fn update(
    diagnostics: Res<DiagnosticsStore>,
    time:Res<Time>,
    mut timer: ResMut<FPSUpdateTimer>,
    mut query: Query<&mut Text, With<FpsText>>,
) {
    if timer.0.tick(time.delta()).just_finished() {
        for mut text in &mut query {
            if let Some(fps) = diagnostics.get(&FrameTimeDiagnosticsPlugin::FPS) {
                if let Some(value) = fps.smoothed() {
                    // Update the value of the second section
                    text.sections[1].value = format!("{value:.0}");
                }
            }
        }
    }
}

fn handle_input(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    settings: Res<settings::Settings>,
    mut query: Query<&mut Visibility, With<FpsText>>,
) {
    if keyboard_input.just_pressed(settings.key_togglehud) {
        for mut vis in &mut query {
            if *vis == Visibility::Inherited {
                *vis = Visibility::Hidden;
            } else {
                *vis = Visibility::Inherited;
            }
        }
    }
}