use jana_sessions_webpage::webpage::SessionConfig;
use serde::Serialize;
use std::fs::File;
use std::path::Path;
use std::{env, fs, io};

fn main() -> io::Result<()> {
  let out_dir = env::var_os("TRUNK_STAGING_DIR").unwrap_or("target/default_configs".into());
  fs::create_dir_all(&out_dir)?;

  create_default_config::<SessionConfig, _>("session_config", &out_dir)?;
  Ok(())
}

fn create_default_config<T, P>(name: &str, out_dir: P) -> io::Result<()>
where
  T: Serialize + Default,
  P: AsRef<Path>,
{
  create_config(name, out_dir, &T::default())
}

fn create_config<T, P>(name: &str, out_dir: P, default_config: &T) -> io::Result<()>
where
  T: Serialize,
  P: AsRef<Path>,
{
  let out_path = out_dir.as_ref().join(format!("default_{name}.json"));
  let out_file = File::create(&out_path)?;
  serde_json::to_writer_pretty(out_file, default_config)?;
  Ok(())
}