use std::{fs, path::PathBuf};

use directories::ProjectDirs;

use crate::{config::Config, errors::McError};

fn project_dirs() -> ProjectDirs {
    ProjectDirs::from("com", "dml", "dml").expect("failed to determine project directories")
}

/// Root Minecraft directory
pub fn minecraft_root(_cfg: &Config) -> PathBuf { project_dirs().data_dir().join("minecraft") }

/* ---------------- setup ---------------- */

pub fn ensure_dirs(cfg: &Config) -> Result<(), McError> {
    let root = minecraft_root(cfg);

    fs::create_dir_all(root.join("versions"))?;
    fs::create_dir_all(root.join("libraries"))?;
    fs::create_dir_all(root.join("assets"))?;

    Ok(())
}

/* ---------------- versions ---------------- */

pub fn version_dir(cfg: &Config, version: &str) -> PathBuf {
    minecraft_root(cfg).join("versions").join(version)
}

pub fn client_jar(cfg: &Config, version: &str) -> Result<PathBuf, McError> {
    Ok(version_dir(cfg, version).join(format!("{}.jar", version)))
}

/* ---------------- libraries ---------------- */

pub fn library_file(cfg: &Config, rel_path: &str) -> Result<PathBuf, McError> {
    Ok(minecraft_root(cfg)
        .join("libraries")
        .join(rel_path))
}

/* ---------------- natives ---------------- */

pub fn natives_dir(cfg: &Config, version: &str) -> PathBuf {
    version_dir(cfg, version).join("natives")
}