yog 0.0.2

//! The §3.4 **start claim**: a fired start focuses the conversation it started.
//!
//! The regression these pin (bl-49cb): Enter in the composer minted, stamped and
//! fired a conversation, and the center pane stayed on the new-conversation
//! placeholder — `prepare_start` adopted the *workspace* and nothing adopted the
//! **conversation**, so the reply streamed unwatched in the roster and the
//! operator had to press ↓ onto their own start. The claim cannot be spent at
//! the fire: the root has no `agents/<id>` ref until the detached driver writes
//! one, so it is held by the minted §3.3 name and spent by the frame's
//! [`AppModel::refresh`] on the first roster whose root wears the name fact —
//! the lernie-stored `name` blob `--name` committed (bl-6920: the goal itself
//! carries no stamp).

use super::Harness;
use crate::nav::ws_key;
use crate::ui_state::SeenKind;
use crate::watch::Mark;
use std::time::Duration;

/// Land a root wearing `name` the way a modern fire does (bl-6920): the goal
/// verbatim on the branch, the name as the lernie-committed `name` blob the
/// derivation reads back as its `name_fact`.
fn build_named(h: &Harness, id: &str, name: &str) {
    h.build_more(id, "fix the gate");
    h.fx.name_agent(id, name);
}

#[test]
fn a_fired_start_focuses_the_conversation_it_started() {
    let h = Harness::new();
    let (clock, mut model) = h.model();
    // Where the operator stands the instant Enter is pressed: the workspace is
    // focused (`prepare_start`'s adoption), nothing is selected.
    model.focus_workspace(&h.ws);
    assert!(model.focus().agent.is_none(), "the placeholder's state");

    model.await_conversation(&h.ws, "stench-pug", "fix the gate");
    assert!(
        model.focus().agent.is_none(),
        "the driver has not written the branch yet — nothing to focus"
    );

    // The detached driver writes the root, wearing the minted name blob.
    build_named(&h, "c-2", "stench-pug");
    model.dirty_handle().mark_all([(h.ws.clone(), Mark::Watch)]);
    model.tick(); // the mark enters the worker's coalescing window
    clock.advance(Duration::from_millis(150));
    assert!(model.tick(), "the roster now carries the started root");

    assert_eq!(
        model.focus().agent.as_deref(),
        Some("c-2"),
        "the start's own conversation is what renders — no ↓, no click"
    );
    // Landing is the ordinary `focus_agent` path the ↓ key takes, so it
    // acknowledges (§6) exactly as an arrival by any other hand does.
    let tip = model
        .tree(&h.ws)
        .and_then(|t| t.agents.iter().find(|a| a.agent_id == "c-2").cloned())
        .map(|a| a.tip_oid)
        .expect("the started root is in the tree");
    assert!(
        model.is_seen(SeenKind::Stopped, &ws_key(&h.ws), "c-2", &tip),
        "arriving on it recorded its watermark"
    );
}

#[test]
fn the_claim_is_spent_once_and_leaves_later_focus_alone() {
    let h = Harness::new();
    let (clock, mut model) = h.model();
    build_named(&h, "c-2", "stench-pug");
    model.dirty_handle().mark_all([(h.ws.clone(), Mark::Watch)]);
    model.tick();
    clock.advance(Duration::from_millis(150));
    model.tick();

    model.await_conversation(&h.ws, "stench-pug", "fix the gate");
    model.refresh();
    assert_eq!(model.focus().agent.as_deref(), Some("c-2"), "claimed");

    // Spent: the operator walks off it and no later frame drags them back.
    model.focus_agent(&h.ws, "c-1");
    model.refresh();
    assert_eq!(
        model.focus().agent.as_deref(),
        Some("c-1"),
        "the claim was spent on its arrival, not held"
    );
}

#[test]
fn a_claim_whose_root_never_appears_moves_nothing() {
    let h = Harness::new();
    let (_c, mut model) = h.model();
    model.focus_agent(&h.ws, "c-1");
    // A start whose driver died before writing its branch, and a workspace with
    // no tree at all — both are the general path with the name fact absent.
    model.await_conversation(&h.ws, "never-written", "fix the gate");
    model.refresh();
    model.await_conversation(
        std::path::Path::new("/no/such/ws"),
        "stench-pug",
        "fix the gate",
    );
    model.refresh();
    assert_eq!(
        model.focus().agent.as_deref(),
        Some("c-1"),
        "an unresolvable claim is inert, never a focus reset"
    );
}

/// The §7.2 echo the §8.2 `message` verb leaves, at the model: the same one
/// pending value, addressing an agent instead of a name — so it paints on the
/// conversation it was aimed at, retires on the message landing, and **moves no
/// focus**. The operator was already there; their own message landing must not
/// drag them back from wherever they have since gone.
#[test]
fn a_message_echoes_without_claiming_the_focus() {
    let h = Harness::new();
    let (clock, mut model) = h.model();
    model.focus_agent(&h.ws, "c-1");
    let landed = model
        .tree(&h.ws)
        .and_then(|t| t.agents.first().map(|a| a.messages))
        .expect("the fixture's conversation");

    model.await_message(&h.ws, "c-1", "and again");
    model.refresh();
    let echoed = model
        .tree(&h.ws)
        .and_then(|t| t.agents.first().cloned())
        .expect("the folded row");
    assert_eq!(
        echoed.pending.len(),
        1,
        "the send is on the row as the undelivered deposit it is (§5.1 #11)"
    );
    assert!(
        echoed.pending[0].in_memory(),
        "and it is yog's word, not disk's"
    );
    assert_eq!(echoed.pending[0].deposit.body, "and again");

    // The operator walks off it while the driver is still cold.
    model.focus_workspace(&h.ws);
    model.refresh();
    assert!(
        model.focus().agent.is_none(),
        "a follow-up's echo carries no focus claim to spend"
    );

    // The driver flushes it: the echo retires and the row is the derivation's.
    let messages = h.ws.join("agents/c-1/messages");
    std::fs::create_dir_all(&messages).unwrap();
    std::fs::write(
        messages.join(format!("{:03}-user.md", landed + 1)),
        "and again",
    )
    .unwrap();
    model.dirty_handle().mark_all([(h.ws.clone(), Mark::Watch)]);
    model.tick();
    clock.advance(Duration::from_millis(150));
    assert!(model.tick(), "the derivation carries the message now");
    assert!(
        model
            .tree(&h.ws)
            .and_then(|t| t.agents.first())
            .is_some_and(|a| a.pending.is_empty()),
        "the echo gave its seat up rather than doubling the message"
    );
}

/// The fold runs only when one of its two inputs moved (§7.2). The rendered
/// `Arc` is `SnapMemo`'s invalidation key, so a fold that allocated per frame
/// would rebuild the transcript per frame — the 35 ms/frame cost bl-e90a
/// removed, reintroduced by the echo.
#[test]
fn an_idle_frame_refolds_nothing_and_hands_back_the_same_pointer() {
    use std::sync::Arc;
    let h = Harness::new();
    let (_c, mut model) = h.model();
    model.refresh();
    let quiet = Arc::clone(&model.snap);
    model.refresh();
    assert!(
        Arc::ptr_eq(&quiet, &model.snap),
        "nothing pending, nothing published: the same snapshot, not a copy of it"
    );

    model.await_message(&h.ws, "c-1", "and again");
    model.refresh();
    let folded = Arc::clone(&model.snap);
    assert!(!Arc::ptr_eq(&quiet, &folded), "a new echo is a new fold");
    model.refresh();
    assert!(
        Arc::ptr_eq(&folded, &model.snap),
        "and holding the same echo over the same derivation folds nothing again"
    );
}