stacksdapp-watcher 0.1.2

use anyhow::Result;
use notify::{Config, RecommendedWatcher, RecursiveMode, Watcher};
use std::path::Path;
use std::time::Duration;
use tokio::sync::mpsc;
use tokio::time::timeout;

pub async fn watch_contracts(contracts_dir: &Path) -> Result<()> {
    let (tx, mut rx) = mpsc::channel(32);
    let mut watcher = RecommendedWatcher::new(
        move |res| {
            let _ = tx.blocking_send(res);
        },
        Config::default().with_poll_interval(Duration::from_millis(500)),
    )?;

    watcher.watch(contracts_dir, RecursiveMode::Recursive)?;

    const DEBOUNCE_MS: u64 = 300;

    while let Some(event) = rx.recv().await {
        if let Ok(e) = event {
            if e.paths
                .iter()
                .any(|p| p.extension().map(|x| x == "clar").unwrap_or(false))
            {
                // Debounce bursts of save/write events before regenerating.
                while let Ok(Some(next_event)) =
                    timeout(Duration::from_millis(DEBOUNCE_MS), rx.recv()).await
                {
                    if let Ok(next) = next_event {
                        let is_clar_change = next
                            .paths
                            .iter()
                            .any(|p| p.extension().map(|x| x == "clar").unwrap_or(false));
                        if !is_clar_change {
                            continue;
                        }
                    }
                }

                println!("[watcher] .clar change detected — regenerating...");
                if let Err(e) = stacksdapp_codegen::generate_all().await {
                    eprintln!("[watcher] codegen error: {e}");
                }
            }
        }
    }

    Ok(())
}