/*
    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
    Copyright (C) 2023 metamuffin <metamuffin.org>
*/
#![feature(lazy_cell)]
use base64::Engine;
use jellycommon::{config::GlobalConfig, AssetLocation};
use std::{fs::File, path::PathBuf, sync::LazyLock};

pub static CONF: LazyLock<GlobalConfig> = LazyLock::new(|| {
    serde_json::from_reader(
        File::open(
            std::env::args()
                .nth(1)
                .expect("First argument must specify the config.json to use."),
        )
        .unwrap(),
    )
    .unwrap()
});

pub fn cache_file(seed: &[&str]) -> PathBuf {
    use sha2::Digest;
    let mut d = sha2::Sha512::new();
    for s in seed {
        d.update(s.as_bytes());
        d.update(b"\0");
    }
    let d = d.finalize();
    let fname = base64::engine::general_purpose::URL_SAFE.encode(d);
    let fname = &fname[..22]; // about 128 bits
    let path = CONF.cache_path.join(fname);
    path
}

pub trait AssetLocationExt {
    fn path(&self) -> PathBuf;
}
impl AssetLocationExt for AssetLocation {
    fn path(&self) -> PathBuf {
        match self {
            AssetLocation::Assets(p) => CONF.asset_path.join(p),
            AssetLocation::Cache(p) => CONF.cache_path.join(p),
            AssetLocation::Library(p) => CONF.library_path.join(p),
        }
    }
}