use actix_web::rt::task::JoinHandle;
use tracing::subscriber::set_global_default;
use tracing::Subscriber;
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_log::LogTracer;

use tracing_subscriber::fmt::MakeWriter;
use tracing_subscriber::{layer::SubscriberExt, EnvFilter};

/// Compose multiple layers into a `tracing`'s subscriber.
pub fn get_subscriber<Sink>(
  name: String,
  env_filter: Option<String>,
  sink: Sink,
) -> impl Subscriber + Sync + Send
where
  Sink: for<'a> MakeWriter<'a> + Send + Sync + 'static,
{
  let env_filter = match env_filter {
    None => {
      dbg!("Using default env filter");
      EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"))
    },
    Some(env_filter) => EnvFilter::new(env_filter),
  };

  let formatting_layer = BunyanFormattingLayer::new(name, sink);
  tracing_subscriber::fmt()
    .with_ansi(true)
    .with_target(true)
    .with_max_level(tracing::Level::TRACE)
    .with_thread_ids(false)
    .with_file(false)
    .pretty()
    .finish()
    .with(env_filter)
    .with(JsonStorageLayer)
    .with(formatting_layer)
}

/// Register a subscriber as global default to process span data.
///
/// It should only be called once!
pub fn init_subscriber(subscriber: impl Subscriber + Sync + Send) {
  LogTracer::init().expect("Failed to set logger");
  set_global_default(subscriber).expect("Failed to set subscriber");
}

pub fn spawn_blocking_with_tracing<F, R>(f: F) -> JoinHandle<R>
where
  F: FnOnce() -> R + Send + 'static,
  R: Send + 'static,
{
  let current_span = tracing::Span::current();
  actix_web::rt::task::spawn_blocking(move || current_span.in_scope(f))
}