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pub mod broadcast_error;
pub mod encoder;
mod path_identifier;
pub mod server;
pub mod state;

use std::error::Error;
use std::net::{SocketAddr, ToSocketAddrs};
use std::ops::Range;
use std::sync::Arc;

use once_cell::sync::OnceCell;
use tokio::task::JoinHandle;
use tracing::{debug, warn};

pub use crate::state::TelemetryState;

pub fn new_state(
    tx_latency_submitted_range: Range<u64>,
    tx_latency_submitted_buckets: u64,
    tx_latency_confirmed_range: Range<u64>,
    tx_latency_confirmed_buckets: u64,
) -> Arc<TelemetryState> {
    Arc::new(TelemetryState::new(
        tx_latency_submitted_range,
        tx_latency_submitted_buckets,
        tx_latency_confirmed_range,
        tx_latency_confirmed_buckets,
    ))
}

static GLOBAL_STATE: OnceCell<Arc<TelemetryState>> = OnceCell::new();

pub fn init(
    tx_latency_submitted_range: Range<u64>,
    tx_latency_submitted_buckets: u64,
    tx_latency_confirmed_range: Range<u64>,
    tx_latency_confirmed_buckets: u64,
) -> &'static Arc<TelemetryState> {
    let new_state = new_state(
        tx_latency_submitted_range,
        tx_latency_submitted_buckets,
        tx_latency_confirmed_range,
        tx_latency_confirmed_buckets,
    );
    match GLOBAL_STATE.set(new_state) {
        Ok(_) => debug!("initialised telemetry global state"),
        Err(_) => debug!("telemetry global state was already set"),
    }
    GLOBAL_STATE.get().unwrap()
}

pub fn global() -> &'static Arc<TelemetryState> {
    match GLOBAL_STATE.get() {
        Some(state) => state,
        None => {
            warn!(
                "global telemetry state not set, will initialize it using default histogram ranges"
            );
            init(
                Range {
                    start: 500,
                    end: 10000,
                },
                10,
                Range {
                    start: 1000,
                    end: 20000,
                },
                10,
            )
        }
    }
}

pub type BoxError = Box<dyn Error + Send + Sync>;

pub fn spawn<A>(
    addr: A,
    state: Arc<TelemetryState>,
) -> Result<(SocketAddr, JoinHandle<Result<(), BoxError>>), BoxError>
where
    A: ToSocketAddrs + Send + 'static,
{
    let addr = addr.to_socket_addrs()?.next().unwrap();
    let handle = tokio::spawn(server::listen(addr, state));

    Ok((addr, handle))
}