use std::io;
use std::path::PathBuf;

use avril_host::environment::Environment;

#[derive(Debug, thiserror::Error)]
pub enum Error {
    #[error("Cannot load env file {}: {source}", .path.display())]
    Load {
        path: PathBuf,
        #[source]
        source: io::Error,
    },
    #[error(transparent)]
    Env(#[from] io::Error),
}

pub fn load_values(paths: &[PathBuf]) -> Result<Vec<(String, String)>, Error> {
    avril_task::load_env_values(paths).map_err(|error| match error {
        avril_task::EnvError::Load { path, source } => Error::Load { path, source },
    })
}

pub fn load(paths: &[PathBuf]) -> Result<Environment, Error> {
    let defaults = Environment::new(load_values(paths)?)?;
    Ok(Environment::from_process().with_defaults(defaults))
}