//! SIGTERM cancels a world tool and preserves its durable invocation for restart.
use sausage::{
    cred::Cred,
    harness::{input, run_module_with_input},
    world::World,
};
use std::{
    path::Path,
    process::{Command, Stdio},
    sync::Arc,
    time::{Duration, Instant},
};

#[tokio::test(flavor = "current_thread")]
async fn shutdown_child() -> anyhow::Result<()> {
    let Ok(path) = std::env::var("SHUTDOWN_WORLD") else {
        return Ok(());
    };
    let world = World::open(Path::new(&path))?;
    let processes = world.processes.clone();
    let cred = Arc::new(Cred::open(&world.host_dir)?);
    let exec = sausage::process::exec(World {
        root: world.root.clone(),
        host_dir: world.host_dir.clone(),
        processes: processes.clone(),
    })?;
    let (sender, receiver) = input::channel();
    let signal = tokio::spawn(input::stop_signal(sender)?);
    run_module_with_input(
        world,
        exec,
        cred,
        receiver,
        concat!(
            "globalThis.foundationCase = 'shutdown';\n",
            include_str!("../../js/foundation-test-bundle.js")
        ),
    )
    .await?;
    signal.abort();
    tokio::time::timeout(Duration::from_secs(1), async {
        while !processes.lock().unwrap().is_empty() {
            tokio::task::yield_now().await;
        }
    })
    .await?;
    Ok(())
}

#[test]
fn sigterm_cancels_tool_and_resumes() -> anyhow::Result<()> {
    let source = Path::new(env!("CARGO_MANIFEST_DIR")).join("..");
    let target = Path::new(env!("CARGO_TARGET_TMPDIR")).parent().unwrap();
    assert!(
        Command::new("cargo")
            .args([
                "build",
                "--release",
                "--locked",
                "-p",
                "sausage-coreutils",
                "--bin",
                "sleep",
                "--manifest-path",
            ])
            .arg(source.join("Cargo.toml"))
            .args(["--target", "wasm32-wasip2", "--target-dir"])
            .arg(target)
            .args(["-j", "2"])
            .status()?
            .success()
    );
    let dir = tempfile::tempdir()?;
    World::open(dir.path())?;
    std::fs::create_dir_all(dir.path().join("world/bin"))?;
    std::fs::copy(
        target.join("wasm32-wasip2/release/sleep.wasm"),
        dir.path().join("world/bin/sleep.wasm"),
    )?;
    let spawn = || {
        Command::new(std::env::current_exe().unwrap())
            .args(["--exact", "harness_shutdown::shutdown_child", "--nocapture"])
            .env("SHUTDOWN_WORLD", dir.path())
            .stdin(Stdio::null())
            .spawn()
    };
    let mut child = spawn()?;
    let deadline = Instant::now() + Duration::from_secs(60);
    while !dir.path().join("world/sleep-ready").exists() {
        if let Some(status) = child.try_wait()? {
            anyhow::bail!("Tool child exited early: {status}");
        }
        if Instant::now() > deadline {
            child.kill()?;
            child.wait()?;
            anyhow::bail!("World sleep did not start");
        }
        std::thread::yield_now();
    }
    assert!(
        Command::new("kill")
            .args(["-TERM", &child.id().to_string()])
            .status()?
            .success()
    );
    let deadline = Instant::now() + Duration::from_secs(5);
    loop {
        if let Some(status) = child.try_wait()? {
            assert!(status.success());
            break;
        }
        if Instant::now() > deadline {
            child.kill()?;
            child.wait()?;
            anyhow::bail!("SIGTERM exceeded five seconds");
        }
        std::thread::yield_now();
    }
    std::fs::write(dir.path().join("world/resume"), "yes")?;
    let mut child = spawn()?;
    let deadline = Instant::now() + Duration::from_secs(20);
    loop {
        if let Some(status) = child.try_wait()? {
            assert!(status.success());
            break;
        }
        if Instant::now() > deadline {
            child.kill()?;
            child.wait()?;
            anyhow::bail!("Restart did not complete");
        }
        std::thread::yield_now();
    }
    Ok(())
}