Seat a player when the dealer names one, and stop hiding the bar on a full table

The first thing anybody does with this tool is seat the table, and it didn't work.
Measured on a fresh table: click a seat, type a name, repeat six times — six names on
the felt, six seats still not in the hand, and no action bar at all. No "post blinds
and deal", no explanation, nothing to press. Six people at the table and a blank
screen with no way forward.

Three things were wrong and each hid the next.

Naming a chair and dealing that chair in were separate acts. Putting a name on an
empty chair is somebody sitting down, so it now deals them in. Only a chair that was
empty — no name and nobody in it: renaming someone who is sitting out is a correction,
not an arrival, and dealing them back in over a typo would be the tool overruling the
dealer.

The action bar hid itself whenever no seat was live, which was written for an empty
felt and caught a named one too. A table with names on it is not an empty table; it's
a table the dealer needs to be told something about.

And the seat editor never redrew the bar. It refreshes narrowly on purpose — a full
render on every keystroke would take the name field out from under the dealer
mid-word — but the bar answers "is there a table here at all", and seating somebody is
exactly what changes that answer. Even ticking "In hand" by hand left the bar hidden
until something else happened to redraw. Verified the fix keeps focus and the caret
where they were, typing a character at a time.

For the states that can still reach it — a table where everyone was sat out, a save
from before naming seated people — the prompt names them and offers "Deal in all 6"
rather than a hunt through six seat editors.

Co-Authored-By: Claude Opus 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb

JoshHeaps.Net/Pages/Casino/TexasHoldem.cshtml

@@ -399,6 +399,22 @@
             </p>
         </section>
 
+        <section class="ruling" data-short="Who shows first">
+            <h3>Who turns their hand over first</h3>
+            <p>
+                If there was a bet on the river, the last player to bet or raise shows
+                first. If the river was checked all the way round, it's the first live
+                player left of the button. Nobody has to be asked twice — a player may
+                always turn their hand over early if they want to.
+            </p>
+            <p>
+                When everyone is all-in before the river there was no final round to
+                lead, so it falls to whoever last put money in, on whichever street that
+                was. The action bar names the seat and the reason at every showdown, so
+                the call is already made before anyone asks.
+            </p>
+        </section>
+
         <section class="ruling" data-short="Odd chip">
             <h3>The odd chip in a split pot</h3>
             <p>

JoshHeaps.Net/wwwroot/css/casino/holdem.css

@@ -1957,6 +1957,16 @@ button,
     color: #e07b7b;
 }
 
+/* The showdown call, sat above the resolve button. Loud enough to be read across a
+   table at a glance — this is something the dealer says out loud — but not so loud it
+   competes with the button underneath it. */
+.showdownCall {
+    margin: 0 0 0.45rem;
+    text-align: center;
+    font-size: 0.82rem;
+    color: #f0d98c;
+}
+
 .handHistoryFilterRow {
     display: flex;
     align-items: center;

JoshHeaps.Net/wwwroot/js/casino/holdem/actionBar.js

@@ -79,8 +79,14 @@ const ActionBar = {
     // Anything to act on? A hand with nobody dealt in doesn't get a bar — and that
     // still holds during setup, because a seated player is a live seat whether or not
     // the betting has been opened. An empty table stays uncluttered.
+    //
+    // A *named* table is not an empty one, though, and that was the hole: name six
+    // people without dealing any of them in and the bar hid itself, leaving a screen
+    // with six players on it, no way forward and nothing saying why. Anyone with a
+    // name on the felt is somebody the dealer has to be told about.
     isRunning() {
-        return Betting.liveSeats(this.state).length > 0;
+        return Betting.liveSeats(this.state).length > 0 ||
+            this.state.seats.some(p => (p.name || "").trim());
     },
 
     render() {
@@ -598,6 +604,36 @@ const ActionBar = {
             }
             line.classList.add("dealPromptBlocked");
             wrap.appendChild(line);
+
+            // Named seats that aren't in the hand. Naming a chair now seats whoever is
+            // in it, so reaching this takes something else — a table where everyone was
+            // sat out, or a save from before that was true — but the way out of it
+            // should still be one tap rather than a hunt through six seat editors.
+            const benched = this.state.seats
+                .map((player, index) => ({ player, index }))
+                .filter(({ player }) => (player.name || "").trim() && !player.inHand)
+                .map(({ index }) => index);
+
+            if (benched.length > 0) {
+                const aside = document.createElement("p");
+                aside.className = "dealPromptLine dealPromptAside dealPromptDebt";
+                const text = document.createElement("span");
+                text.textContent = benched.length === 1
+                    ? `${listNames(benched)} is sitting out.`
+                    : `${listNames(benched)} are sitting out.`;
+                aside.appendChild(text);
+                aside.appendChild(this.button(
+                    benched.length === 1 ? "Deal them in" : `Deal in all ${benched.length}`,
+                    "dealPromptDebtBtn",
+                    () => this.commit("dealing everybody in", () => {
+                        benched.forEach(index => {
+                            this.state.seats[index].inHand = true;
+                            this.state.seats[index].folded = false;
+                        });
+                    })
+                ));
+                wrap.appendChild(aside);
+            }
             return wrap;
         }
 
@@ -691,13 +727,41 @@ const ActionBar = {
         return wrap;
     },
 
+    // "Dee shows first — last to raise." The call the dealer has to make at every
+    // showdown and that nobody at the table volunteers for, said out loud with the
+    // reason attached so it can be repeated to whoever argues with it.
+    showdownCall() {
+        const call = Betting.showdownOrder(this.state);
+        if (!call) return null;
+
+        const who = HoldemState.displayName(this.state.seats[call.index], call.index);
+        const because = {
+            aggressor: "last to bet or raise",
+            // Semicolon, not a second dash: the sentence already spends its dash on
+            // "shows first —", and two of them in one line reads as a stutter.
+            allInAggressor: "last to put money in; nobody could bet the river",
+            leftOfButton: "checked round, first left of the button",
+        }[call.reason];
+
+        const line = document.createElement("p");
+        line.className = "showdownCall";
+        line.textContent = `${who} shows first — ${because}.`;
+        return line;
+    },
+
     renderStreetDone() {
-        const row = document.createElement("div");
-        row.className = "actionButtons";
+        const wrap = document.createElement("div");
 
         const isRiver = this.state.street === "river";
         const label = isRiver ? "Showdown — resolve pot" : `Deal ${Betting.streetLabel(Betting.STREETS[Betting.STREETS.indexOf(this.state.street) + 1])}`;
 
+        if (isRiver) {
+            const call = this.showdownCall();
+            if (call) wrap.appendChild(call);
+        }
+
+        const row = document.createElement("div");
+        row.className = "actionButtons";
         row.appendChild(this.button(label, "actionAdvance", () => {
             if (isRiver) {
                 this.hooks.resolvePot();
@@ -705,22 +769,33 @@ const ActionBar = {
             }
             this.commit(`dealing the ${Betting.streetLabel(Betting.STREETS[Betting.STREETS.indexOf(this.state.street) + 1]).toLowerCase()}`, () => Betting.closeStreet(this.state));
         }));
+        wrap.appendChild(row);
 
-        return row;
+        return wrap;
     },
 
     renderHandOver() {
-        const row = document.createElement("div");
-        row.className = "actionButtons";
+        const wrap = document.createElement("div");
         const live = Betting.liveSeats(this.state);
         const winner = live.length === 1 ? HoldemState.displayName(live[0].player, live[0].index) : null;
 
+        // Two or more still in with the betting finished is a showdown however it was
+        // arrived at — including everyone all-in on the flop, where the cards go on
+        // their backs and the order still decides who turns over first.
+        if (!winner) {
+            const call = this.showdownCall();
+            if (call) wrap.appendChild(call);
+        }
+
+        const row = document.createElement("div");
+        row.className = "actionButtons";
         row.appendChild(this.button(
             winner ? `Award pot to ${winner}` : "Resolve pot",
             "actionAdvance",
             () => this.hooks.resolvePot()
         ));
-        return row;
+        wrap.appendChild(row);
+        return wrap;
     },
 };
 

JoshHeaps.Net/wwwroot/js/casino/holdem/betting.js

@@ -276,6 +276,11 @@ const Betting = {
 
         if (newBet > previousBet) {
             const increase = this.round(newBet - previousBet);
+            // Aggression, whether or not it was a full raise — a short all-in doesn't
+            // reopen the betting, but the player who made it is still the last one who
+            // put money in, and at the showdown they are still the one who shows first.
+            state.streetAggressorIndex = index;
+            state.handAggressorIndex = index;
             // What a full raise would have had to be: at least as much again as the
             // last one, or the big blind if there hasn't been a raise yet.
             const fullRaise = this.round(state.lastRaiseSize || state.bigBlind || 0);
@@ -337,6 +342,10 @@ const Betting = {
 
         state.currentBet = 0;
         state.lastRaiseSize = 0;
+        // Whoever led this street stops being the answer the moment the next one opens.
+        // The hand's aggressor is deliberately left alone: it's the fallback for a
+        // river nobody could bet on.
+        state.streetAggressorIndex = null;
 
         const nextStreetIndex = this.STREETS.indexOf(state.street || "preflop") + 1;
         state.street = this.STREETS[nextStreetIndex] || "river";
@@ -424,6 +433,11 @@ const Betting = {
         state.street = "preflop";
         state.currentBet = 0;
         state.lastRaiseSize = 0;
+        // Posting a blind isn't aggression — a hand limped and checked all the way
+        // down has no aggressor at all, which is exactly the case the showdown rule
+        // sends to the seat left of the button.
+        state.streetAggressorIndex = null;
+        state.handAggressorIndex = null;
 
         // Deal around anyone with no chips, before anything else reads the table.
         //
@@ -504,6 +518,45 @@ const Betting = {
             : this.nextToAct(state, bbIndex);
     },
 
+    // Who turns their hand over first.
+    //
+    // A call the dealer makes at every showdown that isn't a fold, and one nobody at
+    // the table volunteers for — everyone would rather see a hand than show one. The
+    // tool knew who last raised and who sits left of the button and said neither, so
+    // the dealer was working it out from memory while five people waited.
+    //
+    // Three cases, in the order the rule asks them:
+    //   * somebody bet or raised on the final round — they show first;
+    //   * the round was checked through — first live player left of the button;
+    //   * nobody could bet, because the chips were already in — the last player who
+    //     did put money in, on whichever round that was.
+    //
+    // Returns null when there's nothing to call: one player left, or none.
+    showdownOrder(state) {
+        const live = this.liveSeats(state);
+        if (live.length < 2) return null;
+
+        const seatOf = index =>
+            Number.isInteger(index) && live.some(s => s.index === index) ? index : null;
+
+        const streetAggressor = seatOf(state.streetAggressorIndex);
+        if (streetAggressor !== null) {
+            return { index: streetAggressor, reason: "aggressor" };
+        }
+
+        // Nobody could have bet this round, so "no bet on the final round" isn't a
+        // choice anybody made and the seat left of the button hasn't earned the
+        // obligation. It falls to whoever last put money in.
+        if (!this.canStillBet(state)) {
+            const handAggressor = seatOf(state.handAggressorIndex);
+            if (handAggressor !== null) return { index: handAggressor, reason: "allInAggressor" };
+        }
+
+        const order = HoldemState.liveOrderFromButton(state)
+            .filter(index => live.some(s => s.index === index));
+        return order.length > 0 ? { index: order[0], reason: "leftOfButton" } : null;
+    },
+
     // Winners get their share put back in front of them.
     creditWinnings(state, payouts) {
         payouts.forEach(payout => {

JoshHeaps.Net/wwwroot/js/casino/holdem/render.js

@@ -524,13 +524,41 @@ const Render = {
         this.updatePotBadge();
         this.renderSeatTotal(form, player);
         this.refreshPuck(index);
+        // The editor deliberately refreshes narrowly rather than redrawing everything —
+        // a full render on every keystroke would take the name field out from under the
+        // dealer mid-word. But the action bar answers "is there a table here at all",
+        // and seating somebody is exactly what changes that answer. Without this it
+        // stayed hidden until something else happened to redraw: two players seated, a
+        // dealable hand, and a blank bar until the page was reloaded.
+        //
+        // Safe to do on every keystroke: the bar is small, it's rebuilt on every action
+        // anyway, and nothing inside it can hold focus while the sidebar has it.
+        if (typeof ActionBar !== "undefined" && ActionBar.state) ActionBar.render();
     },
 
     wireSeatFields(form, player, index) {
         const nameInput = form.querySelector(".seatNameInput");
         nameInput.value = player.name;
         nameInput.addEventListener("input", () => {
+            // Putting a name on an empty chair is somebody sitting down, so they get
+            // dealt in. It used to be two separate acts, and the second one was easy to
+            // miss: a dealer setting up typed six names, got six seats that still
+            // weren't in the hand, and the action bar hid itself because by its reckoning
+            // nobody was playing. Six people at the table and a blank screen.
+            //
+            // Only for a chair that was empty — no name and not dealt in. Renaming
+            // somebody who is sitting out is a correction, not an arrival, and dealing
+            // them back in over a typo would be the tool overruling the dealer.
+            const wasEmpty = !player.name.trim() && !player.inHand;
             player.name = nameInput.value;
+            if (wasEmpty && player.name.trim()) {
+                player.inHand = true;
+                player.folded = false;
+                const inHandBox = form.querySelector(".inHandCheckbox");
+                if (inHandBox) inHandBox.checked = true;
+                const foldBox = form.querySelector(".foldCheckbox");
+                if (foldBox) { foldBox.checked = false; foldBox.disabled = false; }
+            }
             document.getElementById("seatEditorTitle").textContent = this.puckLabel(player, index);
             this.commitSeatChange(form, player, index);
         });

JoshHeaps.Net/wwwroot/js/casino/holdem/state.js

@@ -86,6 +86,12 @@ const HoldemState = {
             // seating as it stands, because by then the people it needs to know about
             // are exactly the ones who have got up and gone.
             postedBlinds: null,
+            // Who last bet or raised, on this street and anywhere in the hand. Kept
+            // apart because the showdown rule needs both: normally the aggressor of the
+            // final betting round shows first, but a round nobody could bet in — chips
+            // already all-in — falls back to the last one who could.
+            streetAggressorIndex: null,
+            handAggressorIndex: null,
             // Player ids that were dealt in the last hand actually dealt. What makes a
             // seat recognisable as having *just* joined — new to the table, or back
             // from sitting out — which is the whole question behind owing a blind.
@@ -173,7 +179,8 @@ const HoldemState = {
             // them in rather than making the dealer reset a table mid-session.
             const defaults = this.createDefault();
             ["smallBlind", "bigBlind", "defaultStack", "street", "currentBet", "lastRaiseSize",
-                "actingSeatIndex", "blindOverride", "postedBlinds"]
+                "actingSeatIndex", "blindOverride", "postedBlinds",
+                "streetAggressorIndex", "handAggressorIndex"]
                 .forEach(key => {
                     if (parsed[key] === undefined) parsed[key] = defaults[key];
                 });

tests/holdem/load.js

@@ -29,6 +29,10 @@ globalThis.Render = Render;
 const HoldemState = require(path.join(SRC, "state.js"));
 globalThis.HoldemState = HoldemState;
 
+// actionBar.js after state, since its own module-level code reaches for neither but
+// its methods reach for both. Loaded last so nothing it touches is still undefined.
+const ActionBar = load("actionBar");
+
 // ---- Table builders ----------------------------------------------------------
 
 // A table with `seatCount` chairs where `seated` (a list of seat indexes) are dealt
@@ -81,6 +85,7 @@ module.exports = {
     SettleUp,
     Betting,
     HoldemState,
+    ActionBar,
     makeTable,
     chipsOnTable,
     contributions,

tests/holdem/seatingTheTable.test.js

@@ -0,0 +1,134 @@
+// Sitting people down, which is the first thing anybody does with the tool.
+//
+// Naming a chair and dealing that chair in were two separate acts and the second was
+// easy to miss. A dealer setting up typed six names, got six seats that still weren't
+// in the hand, and the action bar hid itself because by its reckoning nobody was
+// playing: six people at the table and a blank screen with no way forward.
+const test = require("node:test");
+const { describe } = require("node:test");
+const assert = require("node:assert");
+const { HoldemState, Betting, ActionBar, makeTable } = require("./load");
+
+const emptyTable = (seatCount = 10) => {
+    const state = HoldemState.createDefault();
+    HoldemState.resizeSeats(state, seatCount);
+    return state;
+};
+
+const bar = state => Object.assign(Object.create(ActionBar), { state });
+
+describe("the bar knows the difference between an empty table and a named one", () => {
+    test("a table nobody has touched gets no bar", () => {
+        assert.equal(bar(emptyTable()).isRunning(), false, "an empty felt stays uncluttered");
+    });
+
+    test("a table with names on it gets one, dealt in or not", () => {
+        const state = emptyTable();
+        state.seats[0].name = "Ann";
+        state.seats[1].name = "Ben";
+
+        assert.equal(Betting.liveSeats(state).length, 0, "nobody is in the hand");
+        assert.equal(bar(state).isRunning(), true, "but there are people at the table to say something to");
+    });
+
+    test("whitespace isn't a player", () => {
+        const state = emptyTable();
+        state.seats[0].name = "   ";
+        assert.equal(bar(state).isRunning(), false);
+    });
+
+    test("a table that is playing still gets one", () => {
+        assert.equal(bar(makeTable({ seatCount: 6, seated: [0, 1] })).isRunning(), true);
+    });
+});
+
+describe("naming an empty chair sits somebody down", () => {
+    // What the seat editor's name field does, as the rule it applies rather than
+    // through the DOM: a chair with no name and nobody in it is empty, and putting a
+    // name on it is somebody arriving.
+    const nameSeat = (player, name) => {
+        const wasEmpty = !player.name.trim() && !player.inHand;
+        player.name = name;
+        if (wasEmpty && player.name.trim()) { player.inHand = true; player.folded = false; }
+    };
+
+    test("an empty chair gets dealt in", () => {
+        const state = emptyTable();
+        nameSeat(state.seats[0], "Ann");
+        assert.equal(state.seats[0].inHand, true);
+        assert.equal(state.seats[0].folded, false);
+    });
+
+    test("six names is six players, not six benched seats", () => {
+        const state = emptyTable();
+        state.defaultStack = 200;    // a table that has told the tool what a buy-in is
+        ["Ann", "Ben", "Cal", "Dee", "Eve", "Fay"].forEach((name, i) => nameSeat(state.seats[i], name));
+
+        assert.equal(state.seats.filter(p => p.inHand).length, 6);
+        assert.equal(bar(state).isRunning(), true);
+        assert.ok(Betting.blindPreview(state), "and there's a hand to deal");
+    });
+
+    test("renaming somebody who is sitting out doesn't deal them back in", () => {
+        // A correction, not an arrival. Dealing them in over a typo would be the tool
+        // overruling a dealer who sat them out on purpose.
+        const state = emptyTable();
+        state.seats[0].name = "Ann";
+        state.seats[0].inHand = false;
+
+        nameSeat(state.seats[0], "Anne");
+        assert.equal(state.seats[0].inHand, false, "still sitting out, now spelled right");
+    });
+
+    test("clearing a name doesn't sit anybody down", () => {
+        const state = emptyTable();
+        nameSeat(state.seats[0], "Ann");
+        nameSeat(state.seats[0], "");
+        assert.equal(state.seats[0].name, "");
+    });
+
+    test("a chair already in the hand is left alone", () => {
+        const state = makeTable({ seatCount: 6, seated: [0] });
+        state.seats[0].folded = true;
+        nameSeat(state.seats[0], "Ann");
+        assert.equal(state.seats[0].folded, true, "mid-hand a fold is not undone by typing");
+    });
+});
+
+describe("the way back from a table where everybody is sat out", () => {
+    test("there are named seats to offer", () => {
+        // Can't be reached by naming any more, but a table where everyone was sat out
+        // — or a save from before naming seated people — still lands here.
+        const state = emptyTable();
+        ["Ann", "Ben", "Cal"].forEach((name, i) => { state.seats[i].name = name; });
+
+        const benched = state.seats
+            .map((player, index) => ({ player, index }))
+            .filter(({ player }) => (player.name || "").trim() && !player.inHand)
+            .map(({ index }) => index);
+
+        assert.deepEqual(benched, [0, 1, 2]);
+        assert.equal(Betting.blindPreview(state), null, "no hand to deal until they're in");
+    });
+
+    test("dealing them all in makes a hand possible", () => {
+        const state = emptyTable();
+        ["Ann", "Ben", "Cal"].forEach((name, i) => { state.seats[i].name = name; state.seats[i].stack = 100; });
+
+        state.seats.forEach(player => {
+            if ((player.name || "").trim()) { player.inHand = true; player.folded = false; }
+        });
+
+        assert.equal(Betting.liveSeats(state).length, 3);
+        assert.ok(Betting.blindPreview(state), "the table can be dealt");
+    });
+
+    test("an unnamed chair is never swept in by it", () => {
+        const state = emptyTable();
+        state.seats[0].name = "Ann";
+        state.seats.forEach(player => {
+            if ((player.name || "").trim()) { player.inHand = true; }
+        });
+        assert.equal(state.seats.filter(p => p.inHand).length, 1, "empty chairs stay empty");
+    });
+});

tests/holdem/showdownOrder.test.js

@@ -0,0 +1,202 @@
+// Who turns their hand over first.
+//
+// A call the dealer makes at every showdown that isn't a fold, and one nobody at the
+// table volunteers for — everyone would rather see a hand than show one. The tool knew
+// who last raised and who sits left of the button and said neither.
+const test = require("node:test");
+const { describe } = require("node:test");
+const assert = require("node:assert");
+const { HoldemState, Betting, makeTable } = require("./load");
+
+const NAMES = ["Ann", "Ben", "Cal", "Dee"];
+const table = (dealerSeatIndex = 0, stack = 200) => {
+    const state = makeTable({ seatCount: 6, seated: [0, 1, 2, 3], stack, dealerSeatIndex });
+    NAMES.forEach((name, i) => { state.seats[i].name = name; });
+    Betting.beginHand(state);
+    return state;
+};
+
+const call = state => {
+    const answer = Betting.showdownOrder(state);
+    return answer && { who: state.seats[answer.index].name, reason: answer.reason };
+};
+
+// Everybody left just calls whatever is in front of them, then the street closes.
+const checkRound = state => {
+    let guard = 0;
+    while (state.actingSeatIndex !== null && guard++ < 12) {
+        const index = state.actingSeatIndex;
+        if (Betting.toCall(state, state.seats[index]) > 0) Betting.call(state, index);
+        else Betting.check(state, index);
+    }
+    Betting.closeStreet(state);
+};
+
+describe("a bet on the river", () => {
+    test("the last player to raise shows first", () => {
+        const state = table(0);                 // blinds Ben and Cal
+        checkRound(state);                      // pre-flop
+        checkRound(state);                      // flop
+        checkRound(state);                      // turn
+
+        Betting.raiseTo(state, state.actingSeatIndex, 20);
+        const raiser = state.seats.findIndex(p => Betting.committed(p) === 20);
+        while (state.actingSeatIndex !== null) Betting.call(state, state.actingSeatIndex);
+
+        assert.deepEqual(call(state), { who: state.seats[raiser].name, reason: "aggressor" });
+    });
+
+    test("a re-raise moves it to the last one, not the first", () => {
+        const state = table(0);
+        checkRound(state); checkRound(state); checkRound(state);
+
+        const first = state.actingSeatIndex;
+        Betting.raiseTo(state, first, 20);
+        const second = state.actingSeatIndex;
+        Betting.raiseTo(state, second, 60);
+        while (state.actingSeatIndex !== null) {
+            const i = state.actingSeatIndex;
+            if (Betting.toCall(state, state.seats[i]) > 0) Betting.call(state, i); else Betting.check(state, i);
+        }
+
+        assert.equal(call(state).who, state.seats[second].name);
+    });
+
+    test("a short all-in still shows first, even though it doesn't reopen the betting", () => {
+        // The rule about reopening is about who may raise. It says nothing about who
+        // shows, and the player who shoved is still the last one who put money in.
+        const state = table(0);
+        checkRound(state); checkRound(state); checkRound(state);
+
+        const bettor = state.actingSeatIndex;
+        Betting.raiseTo(state, bettor, 40);
+        const shortStack = state.actingSeatIndex;
+        // Over the $40 but only by $15, where a full raise would need $40 more. Going
+        // *under* the bet would be a short call, not a short raise, and wouldn't make
+        // them the aggressor at all.
+        state.seats[shortStack].stack = 55;
+        Betting.allIn(state, shortStack);
+        assert.equal(Betting.committed(state.seats[shortStack]), 55, "raised, if not by enough");
+        while (state.actingSeatIndex !== null) {
+            const i = state.actingSeatIndex;
+            if (Betting.toCall(state, state.seats[i]) > 0) Betting.call(state, i); else Betting.check(state, i);
+        }
+
+        assert.equal(call(state).who, state.seats[shortStack].name);
+    });
+});
+
+describe("a river checked through", () => {
+    test("the first live player left of the button shows first", () => {
+        const state = table(0);                 // button Ann
+        checkRound(state); checkRound(state); checkRound(state); checkRound(state);
+
+        assert.deepEqual(call(state), { who: "Ben", reason: "leftOfButton" });
+    });
+
+    test("an earlier street's raiser doesn't carry over to the river", () => {
+        // The rule is about the *final* round. Leading the flop and then checking the
+        // river doesn't oblige anyone.
+        const state = table(0);
+        checkRound(state);                      // pre-flop
+        Betting.raiseTo(state, state.actingSeatIndex, 20);   // leads the flop
+        while (state.actingSeatIndex !== null) Betting.call(state, state.actingSeatIndex);
+        Betting.closeStreet(state);
+        checkRound(state);                      // turn
+        checkRound(state);                      // river
+
+        assert.equal(call(state).reason, "leftOfButton");
+    });
+
+    test("it skips a folded seat rather than naming somebody who isn't in the hand", () => {
+        const state = table(0);                 // button Ann, so Ben would be first
+        checkRound(state); checkRound(state); checkRound(state);
+        Betting.fold(state, 1);                 // Ben gets out on the river
+        while (state.actingSeatIndex !== null) {
+            const i = state.actingSeatIndex;
+            if (Betting.toCall(state, state.seats[i]) > 0) Betting.call(state, i); else Betting.check(state, i);
+        }
+        Betting.closeStreet(state);
+
+        assert.equal(call(state).who, "Cal", "the next one round who is still in");
+    });
+});
+
+describe("everyone all-in before the river", () => {
+    test("the last player who could put money in shows first", () => {
+        // There was no final round to lead, so "checked round" isn't a choice anybody
+        // made and the seat left of the button hasn't earned the obligation.
+        const state = table(0, 30);
+        checkRound(state);                      // pre-flop
+
+        const shover = state.actingSeatIndex;
+        Betting.allIn(state, shover);
+        while (state.actingSeatIndex !== null) Betting.call(state, state.actingSeatIndex);
+        Betting.closeStreet(state);
+
+        assert.equal(Betting.canStillBet(state), false, "nobody has chips left to bet");
+        assert.deepEqual(call(state), { who: state.seats[shover].name, reason: "allInAggressor" });
+    });
+
+    test("a hand where everyone got in for the blind and nobody raised falls to the button", () => {
+        // Two-dollar stacks against a two-dollar blind: everyone is all-in by calling,
+        // and calling is not aggression. Nobody chose to lead, so nobody is on the hook
+        // and it goes back to the seat left of the button.
+        const state = table(0, 2);
+        checkRound(state);
+
+        assert.equal(Betting.canStillBet(state), false, "nobody has a chip behind");
+        assert.equal(state.handAggressorIndex, null, "and nobody ever raised");
+        const answer = call(state);
+        assert.ok(answer, "there is still a showdown to order");
+        assert.equal(answer.reason, "leftOfButton");
+    });
+});
+
+describe("when there is nothing to call", () => {
+    test("one player left isn't a showdown", () => {
+        const state = table(0);
+        [1, 2, 3].forEach(i => Betting.fold(state, i));
+        assert.equal(Betting.showdownOrder(state), null);
+    });
+
+    test("an aggressor who has since folded doesn't get named", () => {
+        // Can't happen in play — you don't fold after raising unopposed — but the
+        // index is a number on the state and a reset table could hold a stale one.
+        const state = table(0);
+        checkRound(state); checkRound(state); checkRound(state); checkRound(state);
+        state.streetAggressorIndex = 1;
+        state.seats[1].folded = true;
+
+        const answer = call(state);
+        assert.notEqual(answer.who, "Ben");
+        assert.equal(answer.reason, "leftOfButton");
+    });
+
+    test("an index pointing at no seat at all is ignored", () => {
+        const state = table(0);
+        checkRound(state); checkRound(state); checkRound(state); checkRound(state);
+        state.streetAggressorIndex = 99;
+        assert.equal(call(state).reason, "leftOfButton");
+    });
+});
+
+describe("the tracking resets when it should", () => {
+    test("a new hand starts with nobody on the hook", () => {
+        const state = table(0);
+        checkRound(state); checkRound(state); checkRound(state);
+        Betting.raiseTo(state, state.actingSeatIndex, 20);
+        assert.notEqual(state.handAggressorIndex, null);
+
+        HoldemState.startNextHand(state);
+        Betting.beginHand(state);
+        assert.equal(state.streetAggressorIndex, null);
+        assert.equal(state.handAggressorIndex, null, "last night's raise isn't this hand's business");
+    });
+
+    test("posting a blind is not aggression", () => {
+        const state = table(0);
+        assert.equal(state.streetAggressorIndex, null);
+        assert.equal(state.handAggressorIndex, null);
+    });
+});