use anyhow::Result;
use futures_util::{SinkExt, StreamExt};
use tokio_tungstenite::tungstenite::Message;

pub async fn send_request(ws_url: &str, request_json: &str) -> Result<String> {
    let (ws_stream, _) = tokio_tungstenite::connect_async(ws_url)
        .await
        .map_err(|e| {
            anyhow::anyhow!(
                "Cannot connect to agcanvas at {}. Is agcanvas running? Error: {}",
                ws_url,
                e
            )
        })?;

    let (mut write, mut read) = ws_stream.split();

    // Skip the initial Connected event
    let _connected = read.next().await;

    write.send(Message::Text(request_json.to_string())).await?;

    match read.next().await {
        Some(Ok(Message::Text(response))) => Ok(response),
        Some(Ok(other)) => Err(anyhow::anyhow!("Unexpected message type: {:?}", other)),
        Some(Err(e)) => Err(anyhow::anyhow!("WebSocket error: {}", e)),
        None => Err(anyhow::anyhow!("Connection closed before response")),
    }
}