yog 0.0.20

//! The **conversation-surface** predicates (§8.2): the four that read the
//! focused workspace's agent set rather than a string or a `JoinState` — Stop
//! and its children cascade, Message, and the nudge. Split from [`super`] at
//! §12's 300-line cap on that seam: everything left there answers a question
//! about *typed text or a ball's join state*, and everything here answers one
//! about **what a conversation is currently doing**.

use super::super::*;
use super::branch;
use crate::git_tree::Agent;
use crate::git_tree::AgentState;

#[test]
fn stop_disabled_when_selection_is_none() {
    let bs = vec![branch("foo", AgentState::InFlight)];
    assert!(!stop_enabled(None, &bs));
}

#[test]
fn stop_disabled_when_selection_not_in_agents() {
    let bs = vec![branch("foo", AgentState::InFlight)];
    assert!(!stop_enabled(Some("bar"), &bs));
}

#[test]
fn stop_disabled_when_selected_agent_stopped() {
    let bs = vec![branch("foo", AgentState::Stopped)];
    assert!(!stop_enabled(Some("foo"), &bs));
}

#[test]
fn stop_disabled_when_selected_agent_quiescent() {
    // A finished-for-now agent has no executor to signal (§2.9).
    let bs = vec![branch("foo", AgentState::Quiescent)];
    assert!(!stop_enabled(Some("foo"), &bs));
}

#[test]
fn stop_enabled_when_selection_is_in_flight() {
    let bs = vec![branch("foo", AgentState::InFlight)];
    assert!(stop_enabled(Some("foo"), &bs));
}

#[test]
fn stop_enabled_when_selection_is_live() {
    // A driver between model calls (running a tool) is stoppable — the
    // very case §2.9's lock-fd discovery exists for.
    let bs = vec![branch("foo", AgentState::Live)];
    assert!(stop_enabled(Some("foo"), &bs));
}

#[test]
fn stop_disabled_when_agents_empty() {
    let bs: Vec<Agent> = vec![];
    assert!(!stop_enabled(Some("foo"), &bs));
}

#[test]
fn stop_picks_correct_agent_among_several() {
    let bs = vec![
        branch("a", AgentState::Stopped),
        branch("b", AgentState::InFlight),
        branch("c", AgentState::Quiescent),
        branch("d", AgentState::Live),
    ];
    assert!(stop_enabled(Some("b"), &bs));
    assert!(stop_enabled(Some("d"), &bs));
    assert!(!stop_enabled(Some("a"), &bs));
    assert!(!stop_enabled(Some("c"), &bs));
}

#[test]
fn message_enabled_only_for_a_present_selection_with_text() {
    // Any state — Message is the resume gesture (contrast stop_enabled); the
    // roster half is the §11 seat's own `present` since bl-1eb0, so this
    // predicate is the text half and the conjunction, nothing more.
    assert!(message_enabled(true, "continue please"));
    assert!(!message_enabled(true, "   "), "blank text");
    assert!(
        !message_enabled(false, "hi"),
        "no selection, or an absent id"
    );
}

/// The nudge and Stop partition the four states between them (bl-9bef): every
/// agent is offered exactly one of the two, so neither is ever a control that
/// fires and does nothing (QUALITY H4). The one exception is
/// [`a_truncated_turn_is_not_nudgeable`], where the partition would put the
/// nudge on a shape litany answers with nothing.
#[test]
fn nudge_is_offered_exactly_where_stop_is_not() {
    let bs = vec![
        branch("a", AgentState::Stopped),
        branch("b", AgentState::InFlight),
        branch("c", AgentState::Quiescent),
        branch("d", AgentState::Live),
    ];
    for id in ["a", "b", "c", "d"] {
        assert_ne!(
            nudge_enabled(Some(id), &bs),
            stop_enabled(Some(id), &bs),
            "{id} is offered both or neither"
        );
    }
    assert!(
        nudge_enabled(Some("a"), &bs),
        "a stopped turn re-dispatches"
    );
    assert!(nudge_enabled(Some("c"), &bs), "a quiescent one continues");
    assert!(!nudge_enabled(None, &bs), "no selection");
    assert!(!nudge_enabled(Some("zz"), &bs), "absent id");
    assert!(!nudge_enabled(Some("a"), &[]), "no agents at all");
}

/// bl-fb87: a turn the output limit cut off leaves an assistant-side tail with
/// no `tool_use`, which linked litany's `advance` reads as `Warrant::NothingDue`
/// — it releases the lease and exits without creating a step. So the partition
/// above gives way here rather than offering a control that fires and does
/// nothing; Message, the recovery, is ungated and unaffected.
#[test]
fn a_truncated_turn_is_not_nudgeable() {
    let mut cut_off = branch("a", AgentState::Stopped);
    cut_off.truncated = true;
    let mut settled_at_rest = branch("b", AgentState::Quiescent);
    settled_at_rest.truncated = true;
    let bs = vec![cut_off, settled_at_rest, branch("c", AgentState::Stopped)];
    assert!(!nudge_enabled(Some("a"), &bs), "stopped and cut off");
    assert!(!nudge_enabled(Some("b"), &bs), "quiescent and cut off");
    assert!(
        nudge_enabled(Some("c"), &bs),
        "an ordinary resting conversation is unaffected"
    );
    // Neither is Stop offered — the conversation holds no driver — so this is
    // the one shape with no §8.2 conversation verb but Message.
    assert!(!stop_enabled(Some("a"), &bs));
    assert!(message_enabled(true, "carry on"));
}

#[test]
fn stop_children_offered_only_with_a_descendant() {
    let bs = vec![
        branch("root-x", AgentState::Live),
        branch("root-x-c1", AgentState::Stopped),
        branch("root-y", AgentState::Live),
    ];
    assert!(stop_children_offered("root-x", &bs), "has a child");
    assert!(!stop_children_offered("root-y", &bs), "leaf agent");
    // A hyphen-boundary miss: root-xx is not a descendant of root-x.
    let bs2 = vec![
        branch("root-x", AgentState::Live),
        branch("root-xx", AgentState::Live),
    ];
    assert!(!stop_children_offered("root-x", &bs2));
}