use tauri::AppHandle;
use tauri_plugin_updater::UpdaterExt;

/// Check for an available update. Returns Some(version_string) if one is
/// available, None if already up to date, and Err if the check fails.
#[tauri::command]
pub async fn check_for_update(app: AppHandle) -> Result<Option<String>, String> {
    let update = app
        .updater()
        .map_err(|e| format!("Updater not available: {e}"))?
        .check()
        .await
        .map_err(|e| format!("Update check failed: {e}"))?;

    match update {
        Some(u) => Ok(Some(u.version.to_string())),
        None => Ok(None),
    }
}

/// Download and stage the update. The app will install it on next launch.
#[tauri::command]
pub async fn install_update(app: AppHandle) -> Result<(), String> {
    let update = app
        .updater()
        .map_err(|e| format!("Updater not available: {e}"))?
        .check()
        .await
        .map_err(|e| format!("Update check failed: {e}"))?
        .ok_or_else(|| "No update available".to_string())?;

    update
        .download_and_install(|_, _| {}, || {})
        .await
        .map_err(|e| format!("Install failed: {e}"))?;

    Ok(())
}