/*!
Delivers event data.

Delivers event data (not yet time-binned) from local storage and provides client functions
to request such data from nodes.
*/

use crate::agg::eventbatch::MinMaxAvgScalarEventBatchStreamItem;
use crate::frame::inmem::InMemoryFrameAsyncReadStream;
use crate::frame::makeframe::{make_frame, make_term_frame};
use crate::raw::bffr::MinMaxAvgScalarEventBatchStreamFromFrames;
use err::Error;
use futures_core::Stream;
use netpod::{AggKind, Channel, NanoRange, Node};
use serde::{Deserialize, Serialize};
use std::pin::Pin;
use tokio::io::AsyncWriteExt;
use tokio::net::TcpStream;
#[allow(unused_imports)]
use tracing::{debug, error, info, span, trace, warn, Level};

pub mod bffr;
pub mod conn;

/**
Query parameters to request (optionally) X-processed, but not T-processed events.
*/
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct EventsQuery {
    pub channel: Channel,
    pub range: NanoRange,
    pub agg_kind: AggKind,
}

#[derive(Serialize, Deserialize)]
pub struct EventQueryJsonStringFrame(String);

pub async fn x_processed_stream_from_node(
    query: EventsQuery,
    node: Node,
) -> Result<Pin<Box<dyn Stream<Item = Result<MinMaxAvgScalarEventBatchStreamItem, Error>> + Send>>, Error> {
    let net = TcpStream::connect(format!("{}:{}", node.host, node.port_raw)).await?;
    let qjs = serde_json::to_string(&query)?;
    let (netin, mut netout) = net.into_split();
    let buf = make_frame(&EventQueryJsonStringFrame(qjs))?;
    netout.write_all(&buf).await?;
    let buf = make_term_frame();
    netout.write_all(&buf).await?;
    netout.flush().await?;
    netout.forget();
    let frames = InMemoryFrameAsyncReadStream::new(netin);
    let items = MinMaxAvgScalarEventBatchStreamFromFrames::new(frames);
    Ok(Box::pin(items))
}

pub fn crchex<T>(t: T) -> String
where
    T: AsRef<[u8]>,
{
    let mut h = crc32fast::Hasher::new();
    h.update(t.as_ref());
    let crc = h.finalize();
    format!("{:08x}", crc)
}