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extern crate proc_macro;
use proc_macro::*;

extern crate syn;

//TODO: either move away from syn or commit to syn, don't use both string parsing and syn
#[proc_macro_attribute]
pub fn timed(_args: TokenStream, input: TokenStream) -> TokenStream {
    use std::str::FromStr;

    let fn_name = {
        let data = input.clone();
        let tokens = syn::parse_macro_input!(data as syn::ItemFn);
        tokens.sig.ident.to_string()
    };

    let mut token_str = input.to_string();
    token_str.insert_str(token_str.find("{").expect("") + 1, 
        &format!("let __internal_stratus_timer = stratus::Timer::new_with_label(\"{}\");", fn_name));
    TokenStream::from_str(&token_str).expect("generated invalid tokens")
}

#[proc_macro_attribute]
pub fn profiled(_args: TokenStream, input: TokenStream) -> TokenStream {
    use std::str::FromStr;

    let fn_name = {
        let data = input.clone();
        let tokens = syn::parse_macro_input!(data as syn::ItemFn);
        tokens.sig.ident.to_string()
    };

    let mut token_str = input.to_string();
    token_str.insert_str(token_str.find("{").expect("") + 1, 
        &format!("let __internal_stratus_profiler = stratus::Profile::new(\"funcion\".to_string(), \"{}\".to_string());", fn_name));
    TokenStream::from_str(&token_str).expect("generated invalid tokens")
}