use std::{error::Error, fs, process::Command};

use shy_launcher::{config::Config, downloader};

#[tokio::main(flavor = "current_thread")]
async fn main() -> Result<(), Box<dyn Error>> {
    println!("Starting app launcher...");
    let config = Config::load("config.json")?;

    println!("Starting download...");
    downloader::download(config.downloads()).await;

    println!("Verifying file presence...");
    for download in config.downloads() {
        let filename = download.filename();
        if !fs::exists(filename)? {
            panic!("Required file {} not present", filename);
        }
        println!("[ok] {}", filename);
    }

    println!("Freeing memory...");
    if unsafe { libc::malloc_trim(0) } == 1 {
        println!("Freed up some memory.");
    }

    println!("Launching app...");
    println!();
    println!("--------------------------");
    println!();

    let mut child = Command::new(config.run())
        .args(config.args())
        .spawn()?;

    let exit = child.wait()?;

    println!();
    println!("--------------------------");
    println!();
    println!("Child exited: {exit}");

    Ok(())
}