use std::{
    collections::HashMap,
    fs::{copy, read_dir},
};

use crate::error::{EType, MLErr, MLE};

/// # Errors
pub fn get_cached_versions(path: &str) -> MLE<HashMap<String, String>> {
    let mut versions: HashMap<String, String> = HashMap::new();
    for file in read_dir(path).map_err(|_| MLErr::new(EType::IoError, "readdir"))? {
        let path = file.map_err(|_| MLErr::new(EType::IoError, "file"))?.path();
        if path.is_file() && path.extension().ok_or(MLErr::new(EType::IoError, "ext"))? == "jar" {
            let pathstr = path.to_str().ok_or(MLErr::new(EType::IoError, "path"))?;
            let namesplit: Vec<&str> = pathstr.split('.').collect();
            versions.insert(
                String::from(namesplit[namesplit.len() - 2]),
                String::from(pathstr),
            );
        }
    }
    Ok(versions)
}

/// # Errors
pub fn copy_cached_version(version_path: &str, download_path: &str) -> MLE<()> {
    let versplit: Vec<&str> = version_path.split('/').collect();
    let download =
        format!("{}/{}", download_path, versplit[versplit.len() - 1]);
    copy(version_path, download).map_err(|err| MLErr::new(EType::IoError, &err.to_string()))?;
    Ok(())
}