use rand::{Rng, distributions::Alphanumeric};
use tokio::fs::create_dir;
use std::io::ErrorKind;
use rocket::fs::TempFile;


pub fn gen_id() -> String {
    rand::thread_rng()
        .sample_iter(Alphanumeric)
        .map(|c| c as char)
        .take(16)
        .collect()
}


pub async fn persist_file(file: &mut TempFile<'_>, filename: &str) -> std::io::Result<()> {
    let dst = format!("uploads/{filename}");
    match file.persist_to(&dst).await {
        Err(e) if e.kind() == ErrorKind::NotFound => {
            create_dir("uploads").await?;
            file.persist_to(&dst).await
        },
        other => other,
    }
}