streamweave 0.10.1

//! Tests for AverageNode

use crate::node::{InputStreams, Node};
use crate::nodes::aggregation::AverageNode;
use std::any::Any;
use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::mpsc;
use tokio_stream::{StreamExt, wrappers::ReceiverStream};

type AnySender = mpsc::Sender<Arc<dyn Any + Send + Sync>>;

/// Helper to create input streams from channels
fn create_input_streams() -> (AnySender, AnySender, InputStreams) {
  let (config_tx, config_rx) = mpsc::channel(10);
  let (in_tx, in_rx) = mpsc::channel(10);

  let mut inputs = HashMap::new();
  inputs.insert(
    "configuration".to_string(),
    Box::pin(ReceiverStream::new(config_rx)) as crate::node::InputStream,
  );
  inputs.insert(
    "in".to_string(),
    Box::pin(ReceiverStream::new(in_rx)) as crate::node::InputStream,
  );

  (config_tx, in_tx, inputs)
}

#[tokio::test]
async fn test_average_node_creation() {
  let node = AverageNode::new("test_average".to_string());
  assert_eq!(node.name(), "test_average");
  assert!(node.has_input_port("configuration"));
  assert!(node.has_input_port("in"));
  assert!(node.has_output_port("out"));
  assert!(node.has_output_port("error"));
}

#[tokio::test]
async fn test_average_integers() {
  let node = AverageNode::new("test_average".to_string());

  let (_config_tx, in_tx, inputs) = create_input_streams();
  let outputs_future = node.execute(inputs);
  let mut outputs = outputs_future.await.unwrap();

  // Send values: 1, 2, 3 → average = 2 (6 / 3)
  let _ = in_tx
    .send(Arc::new(1i32) as Arc<dyn Any + Send + Sync>)
    .await;
  let _ = in_tx
    .send(Arc::new(2i32) as Arc<dyn Any + Send + Sync>)
    .await;
  let _ = in_tx
    .send(Arc::new(3i32) as Arc<dyn Any + Send + Sync>)
    .await;
  drop(in_tx); // Close the input stream

  let out_stream = outputs.remove("out").unwrap();
  let mut results = Vec::new();
  let mut stream = out_stream;
  let timeout = tokio::time::sleep(tokio::time::Duration::from_millis(200));
  tokio::pin!(timeout);

  loop {
    tokio::select! {
      result = stream.next() => {
        if let Some(item) = result {
          results.push(item);
        } else {
          break;
        }
      }
      _ = &mut timeout => break,
    }
  }

  assert_eq!(results.len(), 1);
  // Average of integers is calculated as float
  if let Ok(average) = results[0].clone().downcast::<f64>() {
    assert!((*average - 2.0f64).abs() < f64::EPSILON * 10.0);
  } else {
    panic!("Result is not an f64");
  }
}

#[tokio::test]
async fn test_average_empty_stream() {
  let node = AverageNode::new("test_average".to_string());

  let (_config_tx, in_tx, inputs) = create_input_streams();
  let outputs_future = node.execute(inputs);
  let mut outputs = outputs_future.await.unwrap();

  // Send no values: empty stream → error
  drop(in_tx); // Close the input stream immediately

  let error_stream = outputs.remove("error").unwrap();
  let mut errors = Vec::new();
  let mut stream = error_stream;
  let timeout = tokio::time::sleep(tokio::time::Duration::from_millis(200));
  tokio::pin!(timeout);

  loop {
    tokio::select! {
      result = stream.next() => {
        if let Some(item) = result {
          if let Ok(arc_str) = item.downcast::<String>() {
            errors.push(arc_str.clone());
          }
        } else {
          break;
        }
      }
      _ = &mut timeout => break,
    }
  }

  assert_eq!(errors.len(), 1);
  assert!(errors[0].contains("empty stream"));
}

#[tokio::test]
async fn test_average_floats() {
  let node = AverageNode::new("test_average".to_string());

  let (_config_tx, in_tx, inputs) = create_input_streams();
  let outputs_future = node.execute(inputs);
  let mut outputs = outputs_future.await.unwrap();

  // Send values: 1.5, 2.5, 3.5 → average = 2.5 (7.5 / 3)
  let _ = in_tx
    .send(Arc::new(1.5f64) as Arc<dyn Any + Send + Sync>)
    .await;
  let _ = in_tx
    .send(Arc::new(2.5f64) as Arc<dyn Any + Send + Sync>)
    .await;
  let _ = in_tx
    .send(Arc::new(3.5f64) as Arc<dyn Any + Send + Sync>)
    .await;
  drop(in_tx); // Close the input stream

  let out_stream = outputs.remove("out").unwrap();
  let mut results = Vec::new();
  let mut stream = out_stream;
  let timeout = tokio::time::sleep(tokio::time::Duration::from_millis(200));
  tokio::pin!(timeout);

  loop {
    tokio::select! {
      result = stream.next() => {
        if let Some(item) = result {
          results.push(item);
        } else {
          break;
        }
      }
      _ = &mut timeout => break,
    }
  }

  assert_eq!(results.len(), 1);
  if let Ok(average) = results[0].clone().downcast::<f64>() {
    assert!((*average - 2.5f64).abs() < f64::EPSILON * 10.0);
  } else {
    panic!("Result is not an f64");
  }
}

#[tokio::test]
async fn test_average_single_value() {
  let node = AverageNode::new("test_average".to_string());

  let (_config_tx, in_tx, inputs) = create_input_streams();
  let outputs_future = node.execute(inputs);
  let mut outputs = outputs_future.await.unwrap();

  // Send single value: 42 → average = 42 (42 / 1)
  let _ = in_tx
    .send(Arc::new(42i32) as Arc<dyn Any + Send + Sync>)
    .await;
  drop(in_tx); // Close the input stream

  let out_stream = outputs.remove("out").unwrap();
  let mut results = Vec::new();
  let mut stream = out_stream;
  let timeout = tokio::time::sleep(tokio::time::Duration::from_millis(200));
  tokio::pin!(timeout);

  loop {
    tokio::select! {
      result = stream.next() => {
        if let Some(item) = result {
          results.push(item);
        } else {
          break;
        }
      }
      _ = &mut timeout => break,
    }
  }

  assert_eq!(results.len(), 1);
  // Average of integers is calculated as float
  if let Ok(average) = results[0].clone().downcast::<f64>() {
    assert!((*average - 42.0f64).abs() < f64::EPSILON * 10.0);
  } else {
    panic!("Result is not an f64");
  }
}