trusty-mpm 1.0.2

//! Tests for `SessionManager::mark_reactivated` (#2023 component C).
//!
//! Why: `session_manager/tests.rs` is at the 1500-SLOC test cap; this
//! in-place-reactivation coverage lives here (mirroring `restart_tests.rs`)
//! so neither file grows past its limit.
//! What: proves `mark_reactivated` flips `Stopped`/`Decommissioned` (#2777) ->
//! `Active` WITHOUT ever calling `create_session`/`kill_session`, rejects a
//! non-reactivatable state, and (#2790) refuses the flip when the resolved
//! workspace no longer exists on disk (the real `decommission()` teardown
//! path, not just a harmless forced-state fixture).
//! Test: this file IS the test module; run with `cargo test -p trusty-mpm`.

use tempfile::TempDir;

use super::manager::ManagedError;
use super::record::{ManagedSessionId, ManagedSessionState};
use super::tests::make_manager;

/// `mark_reactivated` must flip a `Stopped` record back to `Active` WITHOUT
/// touching tmux at all (#2023 C) — the caller is about to `exec` `claude`
/// directly back into the SAME pane `mark_runtime_exited_stopped` (#2023 A)
/// left alive, so no `create_session`/`kill_session` call may occur.
///
/// Why: this is the daemon-side half of the bare-`tm` in-pane relaunch path;
/// unlike `resume` it must never recreate the tmux session.
/// What: creates a session, stops it (via `stop`, which DOES kill the pane —
/// irrelevant here, only the record's Stopped state matters), then calls
/// `mark_reactivated` and asserts the record is `Active` and that no
/// ADDITIONAL `create_session`/`kill_session` calls were made by
/// `mark_reactivated` itself.
/// Test: this function IS the test.
#[tokio::test]
async fn mark_reactivated_flips_stopped_to_active() {
    let dir = TempDir::new().unwrap();
    let workspace_dir = TempDir::new().unwrap();
    let (mgr, fake) = make_manager(&dir).await;

    let record = mgr
        .create(
            "task".into(),
            Some(workspace_dir.path().to_owned()),
            None,
            Some(workspace_dir.path().to_owned()),
            None,
            None,
        )
        .await
        .expect("create");

    mgr.stop(&record.id).await.expect("stop");
    let kill_calls_before = fake.kill_calls.lock().unwrap().len();
    let create_calls_before = fake.create_cwd_calls.lock().unwrap().len();

    let reactivated = mgr.mark_reactivated(&record.id).await.expect("reactivate");
    assert_eq!(
        reactivated.state,
        ManagedSessionState::Active,
        "mark_reactivated must flip Stopped -> Active"
    );

    assert_eq!(
        fake.kill_calls.lock().unwrap().len(),
        kill_calls_before,
        "mark_reactivated must NEVER call kill_session (#2023 C)"
    );
    assert_eq!(
        fake.create_cwd_calls.lock().unwrap().len(),
        create_calls_before,
        "mark_reactivated must NEVER call create_session (#2023 C)"
    );

    let after = mgr.get(&record.id).await.unwrap();
    assert_eq!(after.state, ManagedSessionState::Active);
}

/// `mark_reactivated` must also flip a `Decommissioned` record back to `Active`
/// IN PLACE, with no tmux mutation (#2777).
///
/// Why: after a session is decommissioned, its tmux pane can linger as a bare
/// shell printing "run `tm` to relaunch this session". When the operator does
/// exactly that from inside that pane, a switch-client reconnect to the session
/// they are already in is a no-op dead-end. Reviving the tombstone in place —
/// no `create_session`/`kill_session` — is the only non-destructive way to
/// honor that on-screen instruction (the pane survives to `exec` `claude`).
/// What: seeds a record, forces it `Decommissioned` via `set_workspace`, then
/// asserts `mark_reactivated` flips it to `Active` and calls neither
/// `create_session` nor `kill_session`.
/// Test: this function IS the test.
#[tokio::test]
async fn mark_reactivated_flips_decommissioned_to_active() {
    let dir = TempDir::new().unwrap();
    let workspace_dir = TempDir::new().unwrap();
    let (mgr, fake) = make_manager(&dir).await;

    let record = mgr
        .create(
            "task".into(),
            Some(workspace_dir.path().to_owned()),
            None,
            Some(workspace_dir.path().to_owned()),
            None,
            None,
        )
        .await
        .expect("create");

    mgr.set_workspace(
        &record.id,
        workspace_dir.path().to_owned(),
        ManagedSessionState::Decommissioned,
    )
    .await
    .expect("force Decommissioned");

    let kill_calls_before = fake.kill_calls.lock().unwrap().len();
    let create_calls_before = fake.create_cwd_calls.lock().unwrap().len();

    let reactivated = mgr
        .mark_reactivated(&record.id)
        .await
        .expect("reactivate decommissioned");
    assert_eq!(
        reactivated.state,
        ManagedSessionState::Active,
        "mark_reactivated must flip Decommissioned -> Active (#2777)"
    );
    assert_eq!(
        fake.kill_calls.lock().unwrap().len(),
        kill_calls_before,
        "mark_reactivated must NEVER call kill_session"
    );
    assert_eq!(
        fake.create_cwd_calls.lock().unwrap().len(),
        create_calls_before,
        "mark_reactivated must NEVER call create_session"
    );
}

/// `mark_reactivated` must REFUSE to flip a `Decommissioned` record to
/// `Active` when the workspace it would resume into no longer exists on disk
/// (#2790 code-critic CRITICAL/MEDIUM) — proven through the REAL
/// `decommission_with_root` teardown path, not the harmless
/// `set_workspace`-forced fixture (which leaves `workspace_path` pointing at
/// an existing tempdir).
///
/// Why: `decommission()` unconditionally clears `workspace_path` to `None` on
/// tombstone, so `workspace_path` alone cannot tell the daemon whether the
/// directory was actually removed. The guard in `mark_reactivated` falls back
/// to the record's ORIGINAL spawn `cwd` — the same field the in-place-relaunch
/// CLI path resumes into — and must refuse the state flip when THAT directory
/// is gone, so a corrupted `Active` ghost record (workspace gone, state says
/// running) can never be committed to the store, regardless of caller.
/// What: creates an OWNED session whose `cwd`/`workspace_path` live inside a
/// managed root, decommissions it for REAL (the workspace is actually removed
/// from disk), then asserts `mark_reactivated` returns `InvalidState` and that
/// the persisted record is STILL `Decommissioned` (no state flip occurred).
/// Test: this function IS the test.
#[tokio::test]
async fn mark_reactivated_refuses_when_workspace_removed_by_decommission() {
    let dir = TempDir::new().unwrap();
    let (mgr, _fake) = make_manager(&dir).await;

    // Workspace INSIDE a temp "managed root" so decommission's path-containment
    // guard (`is_safe_to_remove`) passes and the directory is actually deleted —
    // mirrors `manager_decommission_removes_workspace`'s setup.
    let managed_root = TempDir::new().unwrap();
    let workspace_path = managed_root.path().join("owner").join("repo").join("sess");
    std::fs::create_dir_all(&workspace_path).unwrap();

    let record = mgr
        .create_with_id(
            ManagedSessionId::new(),
            "task".into(),
            Some(workspace_path.clone()),
            None,
            Some(workspace_path.clone()),
            None,
            None,
            crate::runtime::RuntimeKind::default(),
            false,
            true, // owned: SM provisioned, so decommission actually removes it
        )
        .await
        .expect("create");

    let (tombstone, workspace_removed) = mgr
        .decommission_with_root(&record.id, managed_root.path(), None)
        .await
        .expect("decommission");
    assert!(
        workspace_removed,
        "precondition: the workspace must actually be removed from disk"
    );
    assert_eq!(tombstone.state, ManagedSessionState::Decommissioned);
    assert!(
        !workspace_path.exists(),
        "precondition: workspace directory must be gone from disk"
    );

    let err = mgr
        .mark_reactivated(&record.id)
        .await
        .expect_err("reactivating a session whose workspace is gone must fail");
    assert!(
        matches!(err, ManagedError::InvalidState(_, _)),
        "expected InvalidState, got {err:?}"
    );

    let after = mgr
        .get(&record.id)
        .await
        .expect("get after refused reactivate");
    assert_eq!(
        after.state,
        ManagedSessionState::Decommissioned,
        "the record must NOT be flipped to Active when its workspace is gone"
    );
}

/// `mark_reactivated` must reject any state other than `Stopped`/`Decommissioned`
/// — in particular it must not silently re-mark an already-`Active` session.
///
/// Why: this guards against a stray/duplicate reactivate call (e.g. two
/// bare-`tm` invocations racing in the same pane) silently succeeding twice.
/// What: creates and stops a session so it is `Stopped`, reactivates it once
/// (succeeds), then reactivates it AGAIN and asserts an `InvalidState` error.
/// Test: this function IS the test.
#[tokio::test]
async fn mark_reactivated_rejects_non_stopped() {
    let dir = TempDir::new().unwrap();
    let workspace_dir = TempDir::new().unwrap();
    let (mgr, _fake) = make_manager(&dir).await;

    let record = mgr
        .create(
            "task".into(),
            Some(workspace_dir.path().to_owned()),
            None,
            Some(workspace_dir.path().to_owned()),
            None,
            None,
        )
        .await
        .expect("create");

    mgr.stop(&record.id).await.expect("stop");
    mgr.mark_reactivated(&record.id)
        .await
        .expect("first reactivate");

    let err = mgr
        .mark_reactivated(&record.id)
        .await
        .expect_err("reactivating an already-Active session must fail");
    assert!(
        matches!(err, ManagedError::InvalidState(_, _)),
        "expected InvalidState, got {err:?}"
    );
}