//! Configuration for git-remote-iroh.
//!
//! Stores the iroh secret key so the node ID is persistent.

use anyhow::{Context, Result};
use iroh::SecretKey;
use std::path::PathBuf;

const CONFIG_DIR: &str = ".git-remote-iroh";
const KEY_FILE: &str = "secret_key";

/// Returns the config directory (~/.git-remote-iroh/).
pub fn config_dir() -> Result<PathBuf> {
    let home = std::env::var("HOME").context("HOME not set")?;
    Ok(PathBuf::from(home).join(CONFIG_DIR))
}

/// Loads or generates a persistent iroh secret key.
pub fn load_or_create_key() -> Result<SecretKey> {
    let dir = config_dir()?;
    let key_path = dir.join(KEY_FILE);

    if key_path.exists() {
        let bytes = std::fs::read(&key_path).context("failed to read iroh key")?;
        let arr: [u8; 32] = bytes
            .try_into()
            .map_err(|_| anyhow::anyhow!("invalid key length"))?;
        Ok(SecretKey::from(arr))
    } else {
        std::fs::create_dir_all(&dir).context("failed to create config dir")?;
        let key = SecretKey::generate(&mut rand::rng());
        std::fs::write(&key_path, key.to_bytes()).context("failed to write iroh key")?;
        Ok(key)
    }
}