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use regex::Regex;
use serde::Deserialize;
use std::{io::{BufRead, BufReader}, process::ChildStdout};
use crate::messages::*;
pub(crate) fn decode_sync<'a, T> (msg: &'a str) -> Option<SyncAnswer<T, String>>
where T: Deserialize<'a> {
let regex = Regex::new(r"^[a-zA-Z]+\b").unwrap();
let mat = regex.find(msg)?;
let ty = &msg[..mat.end()];
let rest = &msg[mat.end()..];
match ty {
"OK" => Some(SyncAnswer::Ok(serde_json::from_str(&rest).ok()?)),
"ERROR" => Some(SyncAnswer::Error(rest.to_owned())),
_ => None
}
}
pub(crate) fn decode_async<'a,T,E,N> (msg: &'a str) -> Option<AsyncAnswer<T,E,N>>
where T: Deserialize<'a>, N: Deserialize<'a>, E: Deserialize<'a> {
let regex = Regex::new(r"^[a-zA-Z]+\b").unwrap();
let mat = regex.find(msg)?;
let ty = &msg[..mat.end()];
let rest = &msg[mat.end()..];
match ty {
"NOTE" => Some(AsyncAnswer::Note(serde_json::from_str(&rest).ok()?)),
"FINISHED" => Some(AsyncAnswer::Finished(serde_json::from_str(&rest).ok()?)),
"FAILED" => Some(AsyncAnswer::Failed(serde_json::from_str(&rest).ok()?)),
_ => None
}
}
pub(crate) fn wait_for_client(pipe: &mut BufReader<ChildStdout>) -> Option<ClientHello> {
for res in pipe.lines() {
match res {
Err(_) => (),
Ok(line) => {
let hello : Option<SyncAnswer<ClientHello, _>> = decode_sync(&line);
if let Some(SyncAnswer::Ok(data)) = hello {
return Some(data);
}
}
}
}
None
}
pub(crate) fn get_async_task_id (reader: &mut BufReader<ChildStdout>) -> TaskID {
let mut res = String::new();
reader.read_line(&mut res).unwrap();
match decode_sync(&res).unwrap() {
SyncAnswer::Ok(AsyncStartOk { task }) => task,
SyncAnswer::Error(_) => panic!("failed to start async task!")
}
}
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