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use once_cell::sync::Lazy;
use std::io::Write;
use std::{fs::File, time::Instant};

use crate::multiplex::stream::StreamMessage;

static START: Lazy<Instant> = Lazy::new(Instant::now);

pub fn trace_outgoing_msg(msg: &StreamMessage) {
    static TRACE_OUTGOING: Lazy<Option<File>> = Lazy::new(|| {
        if let Ok(fname) = std::env::var("SOSISTAB_TRACE_OUTGOING") {
            let mut file =
                File::create(fname).expect("cannot create file for SOSISTAB_TRACE_OUTGOING");
            writeln!(file, "time,kind,stream_id,seqno,payload_len").unwrap();
            Some(file)
        } else {
            None
        }
    });

    if let Some(mut inner) = TRACE_OUTGOING.as_ref() {
        if let StreamMessage::Reliable {
            kind,
            stream_id,
            seqno,
            payload,
        } = msg
        {
            let _ = writeln!(
                inner,
                "{},{:?},{stream_id},{seqno},{}",
                START.elapsed().as_secs_f64() * 1000.0,
                kind,
                payload.len()
            );
        }
    }
}

pub fn trace_incoming_msg(msg: &StreamMessage) {
    static TRACE_INCOMING: Lazy<Option<File>> = Lazy::new(|| {
        if let Ok(fname) = std::env::var("SOSISTAB_TRACE_INCOMING") {
            let mut file =
                File::create(fname).expect("cannot create file for SOSISTAB_TRACE_INCOMING");
            writeln!(file, "time,kind,stream_id,seqno,payload_len").unwrap();
            Some(file)
        } else {
            None
        }
    });

    if let Some(mut inner) = TRACE_INCOMING.as_ref() {
        if let StreamMessage::Reliable {
            kind,
            stream_id,
            seqno,
            payload,
        } = msg
        {
            let _ = writeln!(
                inner,
                "{},{:?},{stream_id},{seqno},{}",
                START.elapsed().as_secs_f64() * 1000.0,
                kind,
                payload.len()
            );
        }
    }
}