/*
 * This file is part of laurelin/client
 * Copyright (C) 2023 Jonni Liljamo <jonni@liljamo.com>
 *
 * Licensed under GPL-3.0-only.
 * See LICENSE for licensing information.
 */

use bevy::{
    prelude::*,
    ui::{JustifyContent, Size, Style, Val},
};

use crate::{despawn_screen, GameState};

/// This plugin will display a splsh logo on startup
pub struct SplashPlugin;

impl Plugin for SplashPlugin {
    fn build(&self, app: &mut App) {
        app
            // Load the splash when we enter the Splash state
            .add_system(splash_setup.in_schedule(OnEnter(GameState::Splash)))
            // Run a timer for a few seconds
            .add_system(splash_timer.run_if(in_state(GameState::Splash)))
            // Despawn when we exit the Splash state
            .add_system(despawn_screen::<OnSplashScreen>.in_schedule(OnExit(GameState::Splash)));
    }
}

/// Tag component for tagging entities on the splash screen
#[derive(Component)]
struct OnSplashScreen;

/// Timer resource
#[derive(Resource, Deref, DerefMut)]
struct SplashTimer(Timer);

fn splash_setup(mut commands: Commands, asset_server: Res<AssetServer>) {
    let logo = asset_server.load("branding/logo.png");

    commands
        .spawn((
            NodeBundle {
                style: Style {
                    align_items: AlignItems::Center,
                    justify_content: JustifyContent::Center,
                    size: Size::new(Val::Percent(100.), Val::Percent(100.)),
                    ..Default::default()
                },
                ..Default::default()
            },
            OnSplashScreen,
        ))
        .with_children(|parent| {
            parent.spawn(ImageBundle {
                style: Style {
                    size: Size::new(Val::Px(1000.), Val::Auto),
                    ..Default::default()
                },
                image: UiImage {
                    texture: logo,
                    flip_x: false,
                    flip_y: false,
                },
                ..Default::default()
            });
        });

    // Insert the timer resource
    commands.insert_resource(SplashTimer(Timer::from_seconds(2., TimerMode::Once)));
}

fn splash_timer(mut commands: Commands, time: Res<Time>, mut timer: ResMut<SplashTimer>) {
    if timer.tick(time.delta()).finished() {
        commands.insert_resource(NextState(Some(GameState::Loading)))
    }
}