use crate::prelude::*;
use bevy::{
    asset::{AssetLoader, LoadContext, LoadedAsset},
    reflect::{TypePath, TypeUuid},
    utils::BoxedFuture,
};
use serde::Deserialize;

/// A Tweakfile is resource used to specify game customization like asset names,
/// and non-user customizations made to the game during development.
pub(crate) struct TweakPlugin;

impl Plugin for TweakPlugin {
    fn build(&self, app: &mut App) {
        app.add_systems(OnEnter(GameState::Loading), load_tweakfile);

        app.add_asset::<Tweakfile>()
            .init_asset_loader::<TweakfileLoader>();
    }
}

fn load_tweakfile(server: Res<AssetServer>, mut commands: Commands) {
    let handle: Handle<Tweakfile> = server.load("martian.tweak.toml");
    commands.insert_resource(GameTweakfile(handle));
}

#[derive(Debug, Resource)]
struct GameTweakfile(Handle<Tweakfile>);

/// Tweakfile contains tweaks made to other parts of the game
#[derive(Debug, Deserialize, TypeUuid, TypePath)]
#[uuid = "e5768efe-edce-4267-bdf4-dd8f8ca613c7"]
pub(crate) struct Tweakfile {
    #[serde(default)]
    pub audio: audio::AudioTweaks,
    #[serde(default)]
    pub display3d: display3d::tweaks::Display3dTweaks,
}

#[derive(Default)]
pub struct TweakfileLoader;

impl AssetLoader for TweakfileLoader {
    fn load<'a>(
        &'a self,
        bytes: &'a [u8],
        load_context: &'a mut LoadContext,
    ) -> BoxedFuture<'a, Result<(), bevy::asset::Error>> {
        Box::pin(async move {
            let s = std::str::from_utf8(bytes)?;
            let custom_asset = toml::from_str::<Tweakfile>(s)?;
            load_context.set_default_asset(LoadedAsset::new(custom_asset));
            Ok(())
        })
    }

    fn extensions(&self) -> &[&str] {
        &["tweak.toml"]
    }
}