use bevy::{
    app::App,
    color::Color,
    log::info,
    math::Vec2,
    prelude::{ OnEnter, States },
    reflect::Reflect,
    render::camera::ScalingMode,
    state::app::AppExtStates as _,
};
use bevy_asset_loader::{
    loading_state::{ LoadingState, LoadingStateAppExt },
    standard_dynamic_asset::StandardDynamicAsset,
};
use iyes_progress::ProgressPlugin;

use crate::plugins::splashscreen::{ SplashScreenConfiguration, SplashScreenPlugin };

#[derive(States, Default, Debug, Clone, Eq, PartialEq, Hash, Reflect)]
pub enum GameState {
    #[default]
    SplashScreen,
    Playing,
    // ⚠️ TODO: Setting this to default causes a panic!
    Loading,
    MainMenu,
}

pub fn set_state_splashscreen() {
    info!("Set GameState: SplashScreen");
}

pub fn set_state_loading() {
    info!("Set GameState: Loading");
}

pub fn set_state_mainmenu() {
    info!("Set GameState: MainMenu");
}

pub fn set_state_playing() {
    info!("Set GameState: Playing");
}

pub fn game_state_plugin(app: &mut App) {
    let splash_timer = if cfg!(debug_assertions) { 0.5 } else { 3.0 };
    // Splash Screen Configuration
    let config = SplashScreenConfiguration {
        run_state: GameState::SplashScreen,
        next_state: GameState::Playing,
        // TODO: Implement this motherfucker!
        //next_state: GameState::MainMenu,
        images: StandardDynamicAsset::Files {
            paths: vec!["splash_screens/splash.png".to_owned()],
        },
        custom_size: Some(Vec2::ONE),
        splash_timer,
        clear_color: Color::BLACK,
        camera_scaling_mode: ScalingMode::Fixed {
            width: 1.0,
            height: 1.0,
        },
    };

    // GameState
    app.init_state::<GameState>()
        .register_type::<GameState>()
        .add_loading_state(LoadingState::new(GameState::SplashScreen))
        .add_systems(OnEnter(GameState::SplashScreen), set_state_splashscreen)
        .add_systems(OnEnter(GameState::Loading), set_state_loading)
        .add_systems(OnEnter(GameState::MainMenu), set_state_mainmenu)
        .add_systems(OnEnter(GameState::Playing), set_state_playing)
        // Splash Screen
        .add_plugins(SplashScreenPlugin(config))
        .add_plugins(ProgressPlugin::new(GameState::SplashScreen).continue_to(GameState::Playing));
}