//! File IO for generated codes.

use std::{collections::HashMap, fs, io, path};

/// Write formatted codes generated with [`Module::generate_code`](crate::types::Module::generate_code).
pub fn write_to_files(
    files: HashMap<path::PathBuf, syn::File>,
    out_path: &path::Path,
) -> io::Result<()> {
    if !out_path.is_dir() {
        return Err(io::Error::from(io::ErrorKind::NotADirectory));
    }
    if fs::read_dir(out_path)?.next().is_some() {
        return Err(io::Error::new(
            io::ErrorKind::AlreadyExists,
            "out path is not empty",
        ));
    }
    for (file_path, code) in files {
        fs::DirBuilder::new()
            .recursive(true)
            .create(out_path.join(&file_path).parent().unwrap())?;

        fs::write(out_path.join(&file_path), prettyplease::unparse(&code))?;
    }
    Ok(())
}