use std::path::Path;

use uuid::Uuid;

use crate::state_paths::peer_id_path;

pub const FEATURE_LIBRARY_DELTA: &str = "library-delta-v1";
pub const FEATURE_LIBRARY_SNAPSHOT: &str = "library-snapshot-v1";

pub fn load_or_create_peer_id(state_dir: &Path) -> eyre::Result<String> {
    let path = peer_id_path(state_dir);
    if let Ok(existing) = std::fs::read_to_string(&path) {
        let trimmed = existing.trim();
        if !trimmed.is_empty() {
            return Ok(trimmed.to_string());
        }
    }

    let peer_id = Uuid::now_v7().simple().to_string();
    if let Some(parent) = path.parent() {
        std::fs::create_dir_all(parent)?;
    }
    std::fs::write(&path, peer_id.as_bytes())?;
    Ok(peer_id)
}

pub fn default_features() -> Vec<String> {
    vec![
        FEATURE_LIBRARY_DELTA.to_string(),
        FEATURE_LIBRARY_SNAPSHOT.to_string(),
    ]
}