//! Activation, graph, and upgrade integration tests with raw WASI guests.
use sausage::{Host, world::World};
use serde_json::{Value, json};
use std::{
    path::{Path, PathBuf},
    sync::OnceLock,
    time::Duration,
};

/// Builds genuine guest versions in this executor's target folder.
fn fixture(version: usize) -> PathBuf {
    static FILES: OnceLock<Vec<PathBuf>> = OnceLock::new();
    FILES.get_or_init(|| {
        let root = Path::new(env!("CARGO_MANIFEST_DIR")).parent().unwrap();
        let target = PathBuf::from(concat!(env!("CARGO_TARGET_TMPDIR"), "/activation-guests"));
        (1..=3)
            .map(|version| {
                let target = target.join(version.to_string());
                let status = std::process::Command::new("cargo")
                    .env("FIXTURE_VERSION", version.to_string())
                    .args([
                        "build",
                        "--offline",
                        "--target",
                        "wasm32-wasip2",
                        "--manifest-path",
                    ])
                    .arg(root.join("cli/tests/plugins/activation/Cargo.toml"))
                    .arg("--target-dir")
                    .arg(&target)
                    .status()
                    .unwrap();
                assert!(status.success());
                let copy = target.join(format!("v{version}.wasm"));
                std::fs::copy(
                    target.join("wasm32-wasip2/debug/activation-guest.wasm"),
                    &copy,
                )
                .unwrap();
                copy
            })
            .collect()
    })[version - 1]
        .clone()
}
struct TestWorld(PathBuf);
impl TestWorld {
    /// Creates an isolated world with two version documents per plugin.
    fn new() -> Self {
        let path =
            std::env::temp_dir().join(format!("sausage-activation-{}", uuid::Uuid::now_v7()));
        World::create(&path).unwrap();
        Self(path)
    }
    /// Installs version one and stages version two under the world state.
    fn plugin(&self, name: &str, old: Value, new: Value) {
        std::fs::create_dir_all(self.0.join(format!("plugins/{name}"))).unwrap();
        std::fs::create_dir_all(self.0.join(format!("state/{name}"))).unwrap();
        std::fs::copy(
            fixture(1),
            self.0.join(format!("plugins/{name}/plugin.wasm")),
        )
        .unwrap();
        std::fs::copy(fixture(2), self.0.join(format!("state/{name}/next.wasm"))).unwrap();
        std::fs::write(self.0.join(format!("state/{name}/1.json")), old.to_string()).unwrap();
        std::fs::write(self.0.join(format!("state/{name}/2.json")), new.to_string()).unwrap();
    }
    /// Starts a host with a persistent compile cache shared by the test suites.
    async fn start(&self) -> Host {
        Host::start_with_cache(
            &self.0,
            Path::new(concat!(env!("CARGO_TARGET_TMPDIR"), "/cache")),
        )
        .await
        .unwrap()
    }
}
impl Drop for TestWorld {
    fn drop(&mut self) {
        let _ = std::fs::remove_dir_all(&self.0);
    }
}
/// Builds a method-only document without an upgrade delay.
fn document(name: &str) -> Value {
    json!({"methods":[{"name":name,"params":[],"result":{"schema":{"type":"string"}}}],"x-sausage-grace":0})
}
/// Adds an import of a provider's method list.
fn consumer(provider: &str, expected: Value) -> Value {
    let mut document = document("consume");
    document["x-sausage-imports"] = json!({provider:expected});
    document
}
/// Performs a bounded test call without imposing a host execution limit.
async fn call(host: &Host, method: &str, params: Value) -> Value {
    tokio::time::timeout(Duration::from_secs(60), host.call(method, params))
        .await
        .unwrap()
        .unwrap()
}
/// Activates the staged candidate.
async fn activate(host: &Host, name: &str) -> Result<Value, Value> {
    tokio::time::timeout(
        Duration::from_secs(60),
        host.call(
            "core.activate",
            json!({"plugin":name,"wasm":format!("/state/{name}/next.wasm")}),
        ),
    )
    .await
    .unwrap()
}
/// Waits for a lifecycle marker without a fixed delay.
async fn marker(path: PathBuf, expected: &str) {
    tokio::time::timeout(Duration::from_secs(30), async {
        loop {
            if std::fs::read_to_string(&path).ok().as_deref() == Some(expected) {
                break;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
}
/// Reads the cached graph through the actual proc adapter.
async fn graph(host: &Host) -> Value {
    call(host, "notes.read", json!({"path":"/proc/core/graph.json"})).await
}

/// H1/H2: broken providers and stray files do not block repair, revert, or force.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_repairs_with_broken_entries() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    world.plugin("broken", document("bad"), document("bad"));
    std::fs::write(world.0.join("plugins/broken/plugin.wasm"), b"broken").unwrap();
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    assert!(!graph(&host).await["plugins"]["broken"]["error"].is_null());
    std::fs::copy(fixture(1), world.0.join("plugins/broken/plugin.prev.wasm")).unwrap();
    call(&host, "core.revert", json!({"plugin":"broken"})).await;
    std::fs::write(world.0.join("plugins/broken/plugin.wasm"), b"broken again").unwrap();
    activate(&host, "broken").await.unwrap();
    std::fs::write(world.0.join("plugins/broken/plugin.wasm"), b"broken again").unwrap();
    std::fs::write(
        world.0.join("state/notes/2.json"),
        consumer("broken", document("bad")).to_string(),
    )
    .unwrap();
    call(
        &host,
        "core.activate",
        json!({"plugin":"notes","wasm":"/state/notes/next.wasm","force":true}),
    )
    .await;
    assert_eq!(
        graph(&host).await["plugins"]["notes"]["imports"]["broken"]["status"],
        "unavailable"
    );
    host.stop().await;
}
/// H2: a stray file under plugins does not interrupt discovery or activation.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_stray_file() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    std::fs::write(world.0.join("plugins/notes.md"), "a note").unwrap();
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    assert!(graph(&host).await["plugins"]["notes"]["error"].is_null());
    host.stop().await;
}
/// M4: an answered discovery receives EOF instead of leaking a detached process.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_discovery_answer_stops() {
    let world = TestWorld::new();
    let mut next = document("add");
    next["x-test-linger"] = json!(true);
    world.plugin("notes", document("add"), next);
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    marker(world.0.join("state/notes/discovery-ended-2"), "ended").await;
    host.stop().await;
}
/// Checks that a rejected discovery never receives a retirement hook.
async fn review_candidate_is_not_old_version() {
    use sha2::{Digest, Sha256};
    let world = TestWorld::new();
    let mut rejected = consumer("missing", document("add"));
    rejected["x-test-linger"] = json!(true);
    rejected["x-test-stubborn"] = json!(true);
    world.plugin("notes", document("add"), rejected);
    std::fs::write(
        world.0.join("state/notes/3.json"),
        document("add").to_string(),
    )
    .unwrap();
    std::fs::copy(fixture(3), world.0.join("state/notes/third.wasm")).unwrap();
    let host = world.start().await;
    assert!(activate(&host, "notes").await.is_err());
    let candidate = host
        .processes()
        .into_iter()
        .find(|(_, process)| process.method == "rpc.discover")
        .unwrap()
        .0;
    call(
        &host,
        "core.activate",
        json!({"plugin":"notes","wasm":"/state/notes/third.wasm"}),
    )
    .await;
    call(&host, "core.kill", json!({"pid":candidate})).await;
    let old = format!("{:x}", Sha256::digest(std::fs::read(fixture(1)).unwrap()));
    marker(world.0.join("state/notes/retired"), &old).await;
    let rejected_hash = format!("{:x}", Sha256::digest(std::fs::read(fixture(2)).unwrap()));
    assert!(
        tokio::time::timeout(
            Duration::from_millis(300),
            marker(world.0.join("state/notes/retired"), &rejected_hash)
        )
        .await
        .is_err()
    );
    host.stop().await;
}
/// M6: shutdown suppresses service restarts and retirement hooks from pending upgrades.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_shutdown_suppresses_hooks() {
    let world = TestWorld::new();
    let mut old = document("serve");
    old["x-sausage-grace"] = json!(60);
    world.plugin("notes", old, document("serve"));
    std::fs::write(
        world.0.join("config/boot.json"),
        json!([{"method":"notes.serve","params":{}}]).to_string(),
    )
    .unwrap();
    let host = world.start().await;
    marker(world.0.join("state/notes/service"), "1").await;
    activate(&host, "notes").await.unwrap();
    host.stop().await;
    assert!(host.processes().is_empty());
    assert!(!world.0.join("state/notes/retired").exists());
    assert_eq!(
        std::fs::read_to_string(world.0.join("state/notes/service")).unwrap(),
        "1"
    );
    assert!(
        call(&host, "core.log", json!({"grep":"retired start"}))
            .await
            .as_array()
            .unwrap()
            .is_empty()
    );
    assert_eq!(
        call(&host, "core.log", json!({"grep":"service start"}))
            .await
            .as_array()
            .unwrap()
            .len(),
        1
    );
}
/// Checks retirement against live admissions after a revert.
async fn review_retirement_checks_live_version() {
    let world = TestWorld::new();
    let mut old = document("hold");
    old["x-sausage-grace"] = json!(60);
    world.plugin("notes", old.clone(), old);
    let host = world.start().await;
    call(&host, "notes.hold", json!({})).await;
    let first = host
        .processes()
        .into_iter()
        .find(|(_, p)| p.method == "hold")
        .unwrap()
        .0;
    activate(&host, "notes").await.unwrap();
    call(&host, "core.revert", json!({"plugin":"notes"})).await;
    call(&host, "notes.hold", json!({})).await;
    let second = host
        .processes()
        .into_iter()
        .find(|(pid, p)| p.method == "hold" && *pid != first)
        .unwrap()
        .0;
    activate(&host, "notes").await.unwrap();
    // The v2 retirement from the revert is unrelated to the pending v1 retirement.
    let previous = {
        use sha2::{Digest, Sha256};
        format!("{:x}", Sha256::digest(std::fs::read(fixture(1)).unwrap()))
    };
    call(&host, "core.stop", json!({"pid":first})).await;
    assert!(
        tokio::time::timeout(
            Duration::from_millis(300),
            marker(world.0.join("state/notes/retired"), &previous)
        )
        .await
        .is_err()
    );
    call(&host, "core.stop", json!({"pid":second})).await;
    marker(world.0.join("state/notes/retired"), &previous).await;
    host.stop().await;
}
/// T23: an unwritable compile cache does not prevent a world from running.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn unwritable_compile_cache_is_nonfatal() {
    use std::os::unix::fs::PermissionsExt;
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let parent = world.0.join("unwritable");
    std::fs::create_dir(&parent).unwrap();
    std::fs::set_permissions(&parent, std::fs::Permissions::from_mode(0o500)).unwrap();
    let result = Host::start_with_cache(&world.0, &parent.join("cache")).await;
    std::fs::set_permissions(&parent, std::fs::Permissions::from_mode(0o700)).unwrap();
    let host = result.unwrap();
    assert_eq!(
        call(&host, "notes.version", json!({})).await["version"],
        "1"
    );
    host.stop().await;
}
/// L13: source subtrees require no watches, even when the host cannot read them.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_watcher_is_shallow() {
    use std::os::unix::fs::PermissionsExt;
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let source = world.0.join("plugins/notes/source");
    std::fs::create_dir_all(&source).unwrap();
    std::fs::set_permissions(&source, std::fs::Permissions::from_mode(0o0)).unwrap();
    let result = Host::start_with_cache(
        &world.0,
        Path::new(concat!(env!("CARGO_TARGET_TMPDIR"), "/cache")),
    )
    .await;
    std::fs::set_permissions(&source, std::fs::Permissions::from_mode(0o700)).unwrap();
    let host = result.unwrap();
    activate(&host, "notes").await.unwrap();
    host.stop().await;
}
/// L13: a watcher startup error reaches the journal without preventing host startup.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_watcher_failure_is_nonfatal() {
    use std::os::unix::fs::PermissionsExt;
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let inaccessible = world.0.join("plugins/inaccessible");
    std::fs::create_dir_all(&inaccessible).unwrap();
    std::fs::set_permissions(&inaccessible, std::fs::Permissions::from_mode(0o0)).unwrap();
    let result = Host::start_with_cache(
        &world.0,
        Path::new(concat!(env!("CARGO_TARGET_TMPDIR"), "/cache")),
    )
    .await;
    std::fs::set_permissions(&inaccessible, std::fs::Permissions::from_mode(0o700)).unwrap();
    let host = result.unwrap();
    assert!(
        !call(&host, "core.log", json!({"grep":"watcher failed"}))
            .await
            .as_array()
            .unwrap()
            .is_empty()
    );
    activate(&host, "notes").await.unwrap();
    host.stop().await;
}
/// PROTOCOL 8 (L14): rapid service upgrades never overlap singleton instances.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_singleton_restart() {
    singleton_restart_cycles(4).await;
}

/// PROTOCOL 8 (L14): 128 upgrade/revert cycles stress the singleton restart race.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
#[ignore = "stress: run by nix flake check"]
async fn singleton_restart_stress() {
    singleton_restart_cycles(128).await;
}

/// Exercises service restarts without duplicating the normal and stress setup.
async fn singleton_restart_cycles(cycles: usize) {
    let world = TestWorld::new();
    world.plugin("notes", document("serve"), document("serve"));
    std::fs::write(
        world.0.join("config/boot.json"),
        json!([{"method":"notes.serve","params":{}}]).to_string(),
    )
    .unwrap();
    let host = world.start().await;
    for _ in 0..cycles {
        activate(&host, "notes").await.unwrap();
        call(&host, "core.revert", json!({"plugin":"notes"})).await;
    }
    activate(&host, "notes").await.unwrap();
    marker(world.0.join("state/notes/service"), "2").await;
    host.stop().await;
    assert!(!world.0.join("state/notes/duplicate-service").exists());
}
/// H2: a plugin read error belongs to that entry, not the entire graph.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_read_error_is_local() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    std::fs::create_dir_all(world.0.join("plugins/broken/plugin.wasm")).unwrap();
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    assert!(!graph(&host).await["plugins"]["broken"]["error"].is_null());
    host.stop().await;
}
/// L3: cancellation of the caller cannot cancel an activation body.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn review_dropped_activation_completes() {
    let world = TestWorld::new();
    let mut next = document("add");
    next["x-test-wait"] = json!(true);
    world.plugin("notes", document("add"), next);
    let host = world.start().await;
    let caller = host.clone();
    let task = tokio::spawn(async move { activate(&caller, "notes").await });
    marker(world.0.join("state/notes/discover-started"), "ready").await;
    task.abort();
    let _ = task.await;
    std::fs::write(world.0.join("state/notes/discover-release"), "ready").unwrap();
    tokio::time::timeout(Duration::from_secs(30), async {
        while std::fs::read(world.0.join("plugins/notes/plugin.wasm")).unwrap()
            != std::fs::read(fixture(2)).unwrap()
        {
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    host.stop().await;
}
/// PROTOCOL 10.1: discovery fails after its fixed ten-second deadline and receives EOF.
/// PROTOCOL 3.7: old processes retain their declared grace while new calls use new code.
/// PROTOCOL 3.7: retirement waits for all live admissions, including reverted versions.
/// PROTOCOL 3.7: rejected discovery candidates never receive retirement hooks.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn upgrade_and_discovery_deadlines() {
    tokio::join!(
        review_discovery_deadline_and_stop(),
        old_process_grace_and_new_calls(),
        review_retirement_checks_live_version(),
        review_candidate_is_not_old_version(),
    );
}

/// Checks the fixed discovery deadline and subsequent process stop.
async fn review_discovery_deadline_and_stop() {
    let world = TestWorld::new();
    let mut next = document("add");
    next["x-test-no-answer"] = json!(true);
    world.plugin("notes", document("add"), next);
    let host = world.start().await;
    let before = std::time::Instant::now();
    let result = tokio::time::timeout(Duration::from_secs(15), activate(&host, "notes")).await;
    assert!(
        result.unwrap().unwrap_err()["message"]
            .as_str()
            .unwrap()
            .contains("discovery")
    );
    assert!(before.elapsed() >= Duration::from_millis(9900));
    assert!(
        !host
            .processes()
            .values()
            .any(|process| process.method == "rpc.discover" && process.state == "running")
    );
    host.stop().await;
}

/// PROTOCOL 10.4: proc graph files contain valid documents before discovery completes.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn graph_is_valid_immediately() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let host = world.start().await;
    assert!(graph(&host).await["plugins"].is_object());
    let dot = call(&host, "notes.read", json!({"path":"/proc/core/graph.dot"})).await;
    assert!(dot.as_str().unwrap().starts_with("digraph plugins"));
    host.stop().await;
}
/// PROTOCOL 10.3: a rejected group leaves every installed file unchanged.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn rejects_group_without_changes() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("other"));
    world.plugin(
        "agent",
        consumer("notes", document("add")),
        consumer("notes", document("missing")),
    );
    let host = world.start().await;
    let result = host.call("core.activate",json!({"plugins":[{"plugin":"notes","wasm":"/state/notes/next.wasm"},{"plugin":"agent","wasm":"/state/agent/next.wasm"}]})).await;
    assert_eq!(result.unwrap_err()["code"], -32003);
    for name in ["notes", "agent"] {
        assert_eq!(
            std::fs::read(world.0.join(format!("plugins/{name}/plugin.wasm"))).unwrap(),
            std::fs::read(fixture(1)).unwrap()
        );
    }
    host.stop().await;
}
/// PROTOCOL 10.3: activation discovers and installs a copied candidate.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn activates_copy() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let host = world.start().await;
    let result = activate(&host, "notes").await.unwrap();
    assert!(result["notes"]["methods"].is_array());
    assert_eq!(
        call(&host, "notes.version", json!({})).await["version"],
        "2"
    );
    assert_eq!(
        std::fs::read(world.0.join("plugins/notes/plugin.prev.wasm")).unwrap(),
        std::fs::read(fixture(1)).unwrap()
    );
    host.stop().await;
}
/// PROTOCOL 10.3: changes to the original after discovery starts cannot change the installed copy.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn source_changes_do_not_change_candidate() {
    let world = TestWorld::new();
    let mut next = document("add");
    next["x-test-wait"] = json!(true);
    world.plugin("notes", document("add"), next);
    let host = world.start().await;
    let activation_host = host.clone();
    let activation = tokio::spawn(async move { activate(&activation_host, "notes").await });
    marker(world.0.join("state/notes/discover-started"), "ready").await;
    std::fs::copy(fixture(1), world.0.join("state/notes/next.wasm")).unwrap();
    std::fs::write(world.0.join("state/notes/discover-release"), "ready").unwrap();
    activation.await.unwrap().unwrap();
    assert_eq!(
        std::fs::read(world.0.join("plugins/notes/plugin.wasm")).unwrap(),
        std::fs::read(fixture(2)).unwrap()
    );
    host.stop().await;
}
/// PROTOCOL 3.7: plugins without a declared grace period retain old calls before the default deadline.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn default_grace_retains_old_process() {
    let world = TestWorld::new();
    let mut old = document("hold");
    old.as_object_mut().unwrap().remove("x-sausage-grace");
    world.plugin("notes", old, document("hold"));
    let host = world.start().await;
    call(&host, "notes.hold", json!({})).await;
    let pid = host
        .processes()
        .into_iter()
        .find(|(_, process)| process.method == "hold")
        .unwrap()
        .0;
    activate(&host, "notes").await.unwrap();
    assert_eq!(host.processes()[&pid].state, "running");
    host.stop().await;
}
/// PROTOCOL 10.3: candidate imports must fit installed providers.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn checks_candidate_imports() {
    let world = TestWorld::new();
    world.plugin(
        "notes",
        document("add"),
        consumer("absent", document("add")),
    );
    let host = world.start().await;
    let failure = activate(&host, "notes").await.unwrap_err();
    assert_eq!(failure["code"], -32003);
    assert_eq!(failure["data"][0]["status"], "missing");
    host.stop().await;
}
/// PROTOCOL 10.3: current consumers block an incompatible provider upgrade.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn checks_current_consumers() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("other"));
    world.plugin(
        "agent",
        consumer("notes", document("add")),
        document("consume"),
    );
    let host = world.start().await;
    let failure = activate(&host, "notes").await.unwrap_err();
    assert_eq!(failure["code"], -32003);
    assert_eq!(failure["data"][0]["method"], "add");
    assert_eq!(
        std::fs::read(world.0.join("plugins/notes/plugin.wasm")).unwrap(),
        std::fs::read(fixture(1)).unwrap()
    );
    host.stop().await;
}
/// PROTOCOL 10.3: a group checks the proposed set rather than intermediate versions.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn activates_group() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("other"));
    world.plugin(
        "agent",
        consumer("notes", document("add")),
        consumer("notes", document("other")),
    );
    let host = world.start().await;
    call(&host,"core.activate",json!({"plugins":[{"plugin":"notes","wasm":"/state/notes/next.wasm"},{"plugin":"agent","wasm":"/state/agent/next.wasm"}]})).await;
    assert_eq!(
        call(&host, "agent.version", json!({})).await["version"],
        "2"
    );
    host.stop().await;
}
/// PROTOCOL 10.3: force skips compatibility checks.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn force_skips_checks() {
    let world = TestWorld::new();
    world.plugin(
        "notes",
        document("add"),
        consumer("absent", document("add")),
    );
    let host = world.start().await;
    call(
        &host,
        "core.activate",
        json!({"plugin":"notes","wasm":"/state/notes/next.wasm","force":true}),
    )
    .await;
    host.stop().await;
}
/// PROTOCOL 10.3: revert activates the previous copy and preserves the replaced version.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn reverts_previous_version() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    call(&host, "core.revert", json!({"plugin":"notes"})).await;
    assert_eq!(
        call(&host, "notes.version", json!({})).await["version"],
        "1"
    );
    assert_eq!(
        std::fs::read(world.0.join("plugins/notes/plugin.prev.wasm")).unwrap(),
        std::fs::read(fixture(2)).unwrap()
    );
    host.stop().await;
}
/// PROTOCOL 10.3: concurrent activations serialize their installation and revert state.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn serializes_activations() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let host = world.start().await;
    let (first, second) = tokio::join!(activate(&host, "notes"), activate(&host, "notes"));
    first.unwrap();
    second.unwrap();
    assert_eq!(
        std::fs::read(world.0.join("plugins/notes/plugin.prev.wasm")).unwrap(),
        std::fs::read(fixture(1)).unwrap()
    );
    host.stop().await;
}
/// PROTOCOL 10.4: startup fetches every installed document before activation checks consumers.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn discovers_all_before_checks() {
    checks_current_consumers_body().await;
}
/// Exercises a consumer whose discovery must finish before the provider can change.
async fn checks_current_consumers_body() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("other"));
    world.plugin(
        "agent",
        consumer("notes", document("add")),
        document("consume"),
    );
    let host = world.start().await;
    assert_eq!(activate(&host, "notes").await.unwrap_err()["code"], -32003);
    host.stop().await;
}
/// PROTOCOL 10.4: manual copies update cached hashes and expose broken imports in the journal.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn watches_manual_copy() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("other"));
    world.plugin(
        "agent",
        consumer("notes", document("add")),
        document("consume"),
    );
    let host = world.start().await;
    // A same-version activation waits for initial discovery without changing the provider.
    call(
        &host,
        "core.activate",
        json!({"plugin":"notes","wasm":"/plugins/notes/plugin.wasm"}),
    )
    .await;
    std::fs::copy(fixture(2), world.0.join("plugins/notes/plugin.wasm")).unwrap();
    tokio::time::timeout(Duration::from_secs(30), async {
        loop {
            let graph = graph(&host).await;
            if graph["plugins"]["agent"]["imports"]["notes"]["status"] == "broken" {
                break;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    assert!(
        !call(&host, "core.log", json!({"grep":"broken import"}))
            .await
            .as_array()
            .unwrap()
            .is_empty()
    );
    host.stop().await;
}
/// PROTOCOL 10.4: nonexistent providers appear as missing imports.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn graph_missing_import() {
    let world = TestWorld::new();
    world.plugin(
        "notes",
        consumer("absent", document("add")),
        document("add"),
    );
    let host = world.start().await;
    call(
        &host,
        "core.activate",
        json!({"plugin":"notes","wasm":"/plugins/notes/plugin.wasm","force":true}),
    )
    .await;
    assert_eq!(
        graph(&host).await["plugins"]["notes"]["imports"]["absent"]["status"],
        "missing"
    );
    let dot = call(&host, "notes.read", json!({"path":"/proc/core/graph.dot"})).await;
    assert!(dot.as_str().unwrap().contains("absent"));
    host.stop().await;
}
/// Checks the declared upgrade grace and dispatch to the new version.
async fn old_process_grace_and_new_calls() {
    let world = TestWorld::new();
    let mut old = document("add");
    old["x-sausage-grace"] = json!(0.5);
    world.plugin("notes", old, document("add"));
    let host = world.start().await;
    call(&host, "notes.hold", json!({})).await;
    let pid = host
        .processes()
        .into_iter()
        .find(|(_, process)| process.method == "hold")
        .unwrap()
        .0;
    activate(&host, "notes").await.unwrap();
    assert!(host.processes().contains_key(&pid));
    assert_eq!(
        call(&host, "notes.version", json!({})).await["version"],
        "2"
    );
    marker(world.0.join("state/notes/ended-1"), "ended").await;
    host.stop().await;
}
/// PROTOCOL 3.7: retirement receives the previous hash only after old processes end.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn retires_old_version() {
    use sha2::{Digest, Sha256};
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let host = world.start().await;
    call(&host, "notes.hold", json!({})).await;
    activate(&host, "notes").await.unwrap();
    let previous = format!("{:x}", Sha256::digest(std::fs::read(fixture(1)).unwrap()));
    marker(world.0.join("state/notes/retired"), &previous).await;
    marker(world.0.join("state/notes/ended-1"), "ended").await;
    assert!(
        !call(&host, "core.log", json!({"grep":"retired start"}))
            .await
            .as_array()
            .unwrap()
            .is_empty()
    );
    host.stop().await;
}
/// PROTOCOL 8 and 3.7: services restart after their old process ends.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn restarts_service() {
    let world = TestWorld::new();
    world.plugin("notes", document("serve"), document("serve"));
    std::fs::write(
        world.0.join("config/boot.json"),
        json!([{"method":"notes.serve","params":{}}]).to_string(),
    )
    .unwrap();
    let host = world.start().await;
    marker(world.0.join("state/notes/service"), "1").await;
    activate(&host, "notes").await.unwrap();
    marker(world.0.join("state/notes/service"), "2").await;
    host.stop().await;
}
/// PROTOCOL 8: ordinary detached processes do not become services after an upgrade.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn does_not_restart_detached_call() {
    let world = TestWorld::new();
    world.plugin("notes", document("hold"), document("hold"));
    let host = world.start().await;
    call(
        &host,
        "core.call",
        json!({"method":"notes.hold","params":{},"detach":true}),
    )
    .await;
    activate(&host, "notes").await.unwrap();
    marker(world.0.join("state/notes/ended-1"), "ended").await;
    assert!(
        !host
            .processes()
            .values()
            .any(|process| process.method == "hold" && process.state == "running")
    );
    host.stop().await;
}

/// PROTOCOL 7: activation records the plugin's upgrade grace period in the journal.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn upgrades_enter_the_journal() {
    let world = TestWorld::new();
    let mut old = document("hold");
    old.as_object_mut().unwrap().remove("x-sausage-grace");
    world.plugin("notes", old, document("hold"));
    let host = world.start().await;
    call(&host, "notes.hold", json!({})).await;
    activate(&host, "notes").await.unwrap();
    let entries = tokio::time::timeout(Duration::from_secs(10), async {
        loop {
            let entries = call(
                &host,
                "core.log",
                json!({"plugin":"notes","grep":"upgrade grace"}),
            )
            .await;
            if entries
                .as_array()
                .unwrap()
                .iter()
                .any(|e| e["line"] == "upgrade grace 60 seconds")
            {
                break entries;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .expect("the upgrade journal entry must arrive within 10 seconds");
    assert!(
        entries
            .as_array()
            .unwrap()
            .iter()
            .all(|e| e["stream"] == "core")
    );
    host.stop().await;
}

/// PROTOCOL 10.2 and 10.3: breaking endpoint methods reject activation with counterexamples where possible.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn endpoint_contracts_and_activation_counterexamples() {
    let method = json!({"name":"stats","params":[{"name":"value","required":true,"schema":{"type":"integer","minimum":0}}],"result":{"schema":{"type":"string"}}});
    let expected = json!({"methods":[],"x-sausage-endpoints":{"control":{"methods":[method]}}});
    for case in ["missing", "params", "result", "unsupported"] {
        let world = TestWorld::new();
        let mut next = expected.clone();
        match case {
            "missing" => next["x-sausage-endpoints"]["control"]["methods"] = json!([]),
            "params" => {
                next["x-sausage-endpoints"]["control"]["methods"][0]["params"][0]["schema"]["minimum"] =
                    json!(1)
            }
            "result" => {
                next["x-sausage-endpoints"]["control"]["methods"][0]["result"]["schema"] =
                    json!({"type":"integer"})
            }
            _ => {
                next["x-sausage-endpoints"]["control"]["methods"][0]["result"]["schema"]["pattern"] =
                    json!("[a-z]+")
            }
        }
        world.plugin("notes", expected.clone(), next);
        world.plugin(
            "agent",
            consumer("notes", expected.clone()),
            document("consume"),
        );
        let host = world.start().await;
        let error = activate(&host, "notes").await.unwrap_err();
        assert_eq!(error["code"], -32003, "{case}: {error}");
        assert!(!error["data"].as_array().unwrap().is_empty());
        if ["params", "result"].contains(&case) {
            assert!(
                error["data"]
                    .as_array()
                    .unwrap()
                    .iter()
                    .any(|p| !p["counterexample"].is_null()),
                "{error}"
            );
        }
        if case == "unsupported" {
            assert!(error["data"].to_string().contains("unsupported"), "{error}");
        }
        assert_eq!(
            std::fs::read(world.0.join("plugins/notes/plugin.wasm")).unwrap(),
            std::fs::read(fixture(1)).unwrap()
        );
        host.stop().await;
    }
}

/// PROTOCOL 10.2: providers can add methods, optional params, and result fields without breaking consumers.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn additive_contract_changes_activate() {
    let old = json!({"methods":[{"name":"read","params":[],"result":{"schema":{"type":"object","properties":{"text":{"type":"string"}},"required":["text"]}}}]});
    let mut next = old.clone();
    next["methods"][0]["params"] =
        json!([{"name":"limit","required":false,"schema":{"type":"integer"}}]);
    next["methods"][0]["result"]["schema"]["properties"]["extra"] = json!({"type":"boolean"});
    next["methods"]
        .as_array_mut()
        .unwrap()
        .push(json!({"name":"new","params":[],"result":{"schema":{"type":"null"}}}));
    let world = TestWorld::new();
    world.plugin("notes", old.clone(), next);
    world.plugin("agent", consumer("notes", old), document("consume"));
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    host.stop().await;
}

/// PROTOCOL 3.7: an old consumer can still send its old import during grace, even after the provider removes it.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn old_consumer_can_call_removed_provider_method() {
    let world = TestWorld::new();
    world.plugin("notes", document("legacy"), document("new"));
    let mut old = consumer("notes", document("legacy"));
    old["x-sausage-grace"] = json!(60);
    world.plugin("agent", old, document("consume"));
    let host = world.start().await;
    let pid = call(&host, "agent.deferred", json!({})).await;
    activate(&host, "agent").await.unwrap();
    activate(&host, "notes").await.unwrap();
    assert_eq!(host.processes()[pid.as_str().unwrap()].state, "running");
    std::fs::write(world.0.join("state/agent/release-call"), "release").unwrap();
    let response: Value = tokio::time::timeout(Duration::from_secs(10), async {
        loop {
            if let Ok(bytes) = std::fs::read(world.0.join("state/agent/call-result"))
                && let Ok(value) = serde_json::from_slice(&bytes)
            {
                break value;
            }
            tokio::task::yield_now().await;
        }
    })
    .await
    .unwrap();
    assert_eq!(response["error"]["code"], -32601);
    assert_eq!(response["error"]["data"]["version"], "2");
    host.stop().await;
}

/// PROTOCOL 10.2: activation and revert check interfaces but leave persistent state unchanged.
#[tokio::test(flavor = "multi_thread", worker_threads = 2)]
async fn state_is_outside_interface_checks() {
    let world = TestWorld::new();
    world.plugin("notes", document("add"), document("add"));
    let state = world.0.join("state/notes/user-state");
    let contents = b"a state format neither version understands\0";
    std::fs::write(&state, contents).unwrap();
    let host = world.start().await;
    activate(&host, "notes").await.unwrap();
    assert_eq!(std::fs::read(&state).unwrap(), contents);
    call(&host, "core.revert", json!({"plugin":"notes"})).await;
    assert_eq!(std::fs::read(state).unwrap(), contents);
    host.stop().await;
}