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extern crate proc_macro;

use proc_macro::TokenStream;

use quote::quote;

#[proc_macro]
pub fn process_lock(_item: TokenStream) -> TokenStream {
    let result = quote! {
        use huber_common::model::config::Config;
        use std::fs::File;
        use fs2::FileExt;
        use log::{error, info};

        let lock_path = Config::new().lock_file().unwrap();
        let f = if !lock_path.exists() {
            File::create(&lock_path)
        } else {
            File::open(&lock_path)
        }.unwrap();

        let r = f.try_lock_exclusive();
        match r {
            Ok(_) => {
                info!("{}: {:?}", "Locking the operation", lock_path);
            },

            Err(e) => {
                error!("{:?}: {:?}", lock_path, e);
                return Err(anyhow!("huber is already running by another process for the exclusion operation. Please try after the operation finished. {:?}", e))
            }
        }
    };

    result.into()
}