// The bar a dealer's thumb lives on while a hand is running: who's to act, what it
// costs them, and one tap per decision. Sits at the bottom of the screen on a phone
// so it's reachable without looking, and re-renders after every action because the
// next player's numbers are different.
const ActionBar = {
    state: null,
    hooks: null,
    raiseOpen: false,
    raiseDraft: null,

    mount(state, hooks) {
        this.state = state;
        this.hooks = hooks;
        this.watchHeight();
        this.render();
    },

    // The bar is fixed to the bottom of the screen, so everything else has to know how
    // tall it is or the table simply runs underneath it — on a 640px-tall phone the
    // bottom seats of the oval were sitting behind the Fold button. Its height isn't a
    // constant either: opening the raise pad grows it. Publishing the measured height
    // as a custom property lets the layout and the toast both stay clear of it without
    // anyone guessing a number.
    watchHeight() {
        const host = document.getElementById("actionBar");
        if (!host || this.heightWatcher) return;

        const publish = () => {
            const visible = !host.hidden;
            const height = visible ? host.getBoundingClientRect().height : 0;
            document.documentElement.style.setProperty("--actionBarHeight", `${Math.round(height)}px`);
        };

        if (typeof ResizeObserver === "function") {
            this.heightWatcher = new ResizeObserver(publish);
            this.heightWatcher.observe(host);
        }
        window.addEventListener("resize", publish);
        window.addEventListener("orientationchange", publish);
        publish();
    },

    // Anything to act on? A hand with nobody dealt in doesn't get a bar.
    isRunning() {
        return Betting.liveSeats(this.state).length > 0;
    },

    render() {
        const host = document.getElementById("actionBar");
        if (!host) return;
        host.innerHTML = "";

        if (!this.isRunning()) {
            host.hidden = true;
            document.body.classList.remove("hasActionBar");
            document.documentElement.style.setProperty("--actionBarHeight", "0px");
            this.stopTankTimer();
            this.tankSeatIndex = null;
            return;
        }
        host.hidden = false;
        document.body.classList.add("hasActionBar");

        host.appendChild(this.renderStatus());

        const breakdown = this.renderPotBreakdown();
        if (breakdown) host.appendChild(breakdown);

        if (Betting.isHandOver(this.state)) {
            host.appendChild(this.renderHandOver());
        } else if (this.state.actingSeatIndex === null || this.state.actingSeatIndex === undefined) {
            host.appendChild(this.renderStreetDone());
        } else if (this.raiseOpen) {
            host.appendChild(this.renderRaisePad());
        } else {
            host.appendChild(this.renderActions());
        }

        this.syncTankTimer();
    },

    renderStatus() {
        const row = document.createElement("div");
        row.className = "actionStatus";

        const street = document.createElement("span");
        street.className = "actionStreet";
        street.textContent = Betting.streetLabel(this.state.street);
        row.appendChild(street);

        const pot = document.createElement("span");
        pot.className = "actionPot";
        pot.textContent = `Pot ${Money.format(Betting.potSoFar(this.state))}`;
        row.appendChild(pot);

        // How many are still in the hand — part of the standard per-street
        // announcement, and the number a dealer is asked for most often.
        const remaining = Betting.liveSeats(this.state).length;
        const players = document.createElement("span");
        players.className = "actionPlayers";
        players.textContent = `${remaining} ${remaining === 1 ? "player" : "players"}`;
        row.appendChild(players);

        // Nobody is being asked to act because nobody can — say so, or the bar just
        // looks like it's waiting for something.
        if (Betting.isRunningOut(this.state) && !Betting.isHandOver(this.state)) {
            const runout = document.createElement("span");
            runout.className = "actionRunout";
            const stillIn = Betting.liveSeats(this.state).length;
            runout.textContent = `All-in — running out the board (${stillIn} players)`;
            row.appendChild(runout);
        }

        const index = this.state.actingSeatIndex;
        if (index !== null && index !== undefined && !Betting.isHandOver(this.state)) {
            const player = this.state.seats[index];
            const who = document.createElement("span");
            who.className = "actionWho";
            who.textContent = `${HoldemState.displayName(player, index)} · ${Money.format(Betting.stackOf(this.state, player))} behind`;
            row.appendChild(who);

            const tank = document.createElement("span");
            tank.className = "actionTank";
            tank.id = "actionTank";
            tank.title = "How long this player has been thinking";
            tank.textContent = "0:00";
            row.appendChild(tank);
        }

        // A standing control rather than a toast per action: a dealer taps this bar
        // constantly, and a toast after every fold would be noise they'd learn to
        // ignore — which is exactly when they'd miss the one that mattered.
        const undoLabel = this.hooks.lastActionLabel();
        if (undoLabel) {
            const undo = document.createElement("button");
            undo.type = "button";
            undo.className = "actionUndo";
            undo.title = `Undo ${undoLabel}`;
            undo.textContent = `↶ ${undoLabel}`;
            undo.addEventListener("click", () => this.hooks.undoLast());
            row.appendChild(undo);
        }

        return row;
    },

    // ---- Think timer ----
    //
    // A player who hasn't noticed the action is on them costs more time than anything
    // else a dealer does, so the bar shows how long the current player has been in the
    // tank. It's a stopwatch, not a shot clock: nothing happens when it grows, it just
    // tells the dealer when it's worth a nudge.
    NUDGE_AFTER_S: 30,
    SLOW_AFTER_S: 60,

    tankSeatIndex: null,
    tankStartedAt: null,
    tankInterval: null,

    // Restarts only when the action actually moves — a re-render for any other reason
    // (a chip edit, a name change) must not put a thinking player back to zero.
    syncTankTimer() {
        const index = this.state.actingSeatIndex;
        const running = index !== null && index !== undefined && !Betting.isHandOver(this.state);

        if (!running) {
            this.stopTankTimer();
            this.tankSeatIndex = null;
            return;
        }

        if (this.tankSeatIndex !== index) {
            this.tankSeatIndex = index;
            this.tankStartedAt = Date.now();
        }

        if (!this.tankInterval) {
            this.tankInterval = setInterval(() => this.paintTank(), 1000);
        }
        this.paintTank();
    },

    stopTankTimer() {
        if (this.tankInterval) {
            clearInterval(this.tankInterval);
            this.tankInterval = null;
        }
    },

    // Updates only the timer's own text, so the seconds ticking over never rebuilds the
    // buttons under the dealer's thumb.
    paintTank() {
        const el = document.getElementById("actionTank");
        if (!el || this.tankStartedAt === null) return;

        const seconds = Math.floor((Date.now() - this.tankStartedAt) / 1000);
        const mins = Math.floor(seconds / 60);
        el.textContent = `${mins}:${String(seconds % 60).padStart(2, "0")}`;
        el.classList.toggle("tankNudge", seconds >= this.NUDGE_AFTER_S && seconds < this.SLOW_AFTER_S);
        el.classList.toggle("tankSlow", seconds >= this.SLOW_AFTER_S);
    },

    // Shown only once someone is all-in and the money has actually split — a single
    // undivided pot needs no announcement, and a line that's always there stops being
    // read.
    renderPotBreakdown() {
        // Only worth showing once someone is actually all-in. Mid-street the amounts in
        // front of players are unequal all the time — the blinds alone are unequal —
        // and layering that would announce a side pot on every hand before anyone had
        // even acted.
        const someoneAllIn = this.state.seats.some(
            player => player.inHand && Betting.handTotal(player) > 0 && Betting.stackOf(this.state, player) <= 0
        );
        if (!someoneAllIn) return null;

        const contributions = this.state.seats.map((player, index) => ({
            id: player.id,
            index,
            contribution: Betting.handTotal(player),
            folded: player.folded,
        }));

        const nameById = new Map(
            this.state.seats.map((player, index) => [player.id, HoldemState.displayName(player, index)])
        );

        return Render.buildPotBreakdown(
            PotCalculator.layers(contributions),
            PotCalculator.uncalledReturns(contributions),
            id => nameById.get(id)
        );
    },

    // Which key presses each button. Shown on the button itself and hidden on touch
    // devices — a shortcut nobody can discover may as well not exist, and a key badge
    // on a phone is just clutter.
    KEY_HINTS: {
        actionFold: "F",
        actionCheck: "C",
        actionCall: "C",
        actionRaise: "R",
        actionAdvance: "↵",
        raiseConfirm: "↵",
        raiseCancel: "esc",
    },

    button(label, className, onClick, sublabel) {
        const btn = document.createElement("button");
        btn.type = "button";
        btn.className = `actionBtn ${className}`;

        const main = document.createElement("span");
        main.className = "actionBtnLabel";
        main.textContent = label;
        btn.appendChild(main);

        const hint = this.KEY_HINTS[className];
        if (hint) {
            const kbd = document.createElement("kbd");
            kbd.className = "actionKey";
            kbd.textContent = hint;
            btn.appendChild(kbd);
        }

        if (sublabel) {
            const sub = document.createElement("span");
            sub.className = "actionBtnSub";
            sub.textContent = sublabel;
            btn.appendChild(sub);
        }

        btn.addEventListener("click", onClick);
        return btn;
    },

    // Every action taken from the bar goes through here, which is also where it gets
    // recorded so it can be taken back. A misclick on Fold is the one mistake in this
    // tool a dealer can't talk their way out of.
    commit(label, mutate) {
        this.hooks.beginAction(label);
        mutate();
        this.hooks.save(this.state);
        this.hooks.rerender();
    },

    renderActions() {
        const index = this.state.actingSeatIndex;
        const player = this.state.seats[index];
        const owed = Betting.toCall(this.state, player);
        const stack = Betting.stackOf(this.state, player);
        const who = HoldemState.displayName(player, index);

        const row = document.createElement("div");
        row.className = "actionButtons";

        row.appendChild(this.button("Fold", "actionFold", () => this.commit(`${who}'s fold`, () => Betting.fold(this.state, index))));

        if (owed <= 0) {
            row.appendChild(this.button("Check", "actionCheck", () => this.commit(`${who}'s check`, () => Betting.check(this.state, index))));
        } else if (owed >= stack) {
            // Calling would put them all-in, so say that rather than quoting a number
            // they can't cover.
            row.appendChild(this.button("Call all-in", "actionCall", () => this.commit(`${who}'s all-in`, () => Betting.allIn(this.state, index)), Money.format(stack)));
        } else {
            row.appendChild(this.button("Call", "actionCall", () => this.commit(`${who}'s call`, () => Betting.call(this.state, index)), Money.format(owed)));
        }

        if (stack > owed) {
            row.appendChild(this.button(owed > 0 ? "Raise" : "Bet", "actionRaise", () => {
                this.raiseOpen = true;
                this.raiseDraft = Math.min(Betting.minRaiseTo(this.state), Betting.committed(player) + stack);
                this.render();
            }));
        }

        return row;
    },

    // Quick amounts first, keypad second — a dealer calling "raise to sixty" wants a
    // button, and only reaches for digits when the table does something odd.
    renderRaisePad() {
        const index = this.state.actingSeatIndex;
        const player = this.state.seats[index];
        const stack = Betting.stackOf(this.state, player);
        const maxTo = Betting.round(Betting.committed(player) + stack);
        const pot = Betting.potSoFar(this.state);
        const minTo = Math.min(Betting.minRaiseTo(this.state), maxTo);

        const wrap = document.createElement("div");
        wrap.className = "raisePad";

        const quick = document.createElement("div");
        quick.className = "raiseQuick";

        const options = [
            { label: "Min", value: minTo },
            { label: "½ pot", value: Betting.round(this.state.currentBet + pot / 2) },
            { label: "Pot", value: Betting.round(this.state.currentBet + pot) },
            { label: "All-in", value: maxTo },
        ];
        options.forEach(option => {
            const value = Math.max(minTo, Math.min(option.value, maxTo));
            const btn = this.button(option.label, "raiseQuickBtn", () => {
                this.raiseDraft = value;
                this.render();
            }, Money.format(value));
            if (Betting.round(this.raiseDraft) === value) btn.classList.add("selected");
            quick.appendChild(btn);
        });
        wrap.appendChild(quick);

        const entry = document.createElement("div");
        entry.className = "raiseEntry";

        const input = document.createElement("input");
        input.type = "text";
        input.inputMode = "decimal";
        input.className = "raiseInput";
        input.value = this.raiseDraft ?? minTo;
        input.setAttribute("aria-label", "Raise to amount");
        input.addEventListener("input", () => {
            this.raiseDraft = input.value.replace(/[^0-9.]/g, "");
        });
        entry.appendChild(input);

        entry.appendChild(this.button("Cancel", "raiseCancel", () => {
            this.raiseOpen = false;
            this.render();
        }));

        entry.appendChild(this.button("Raise to", "raiseConfirm", () => {
            const target = Math.max(0, Math.min(Number(this.raiseDraft) || 0, maxTo));
            this.raiseOpen = false;
            const who = HoldemState.displayName(player, index);
            this.commit(`${who}'s raise to ${Money.format(target)}`, () => Betting.raiseTo(this.state, index, target));
        }));

        wrap.appendChild(entry);
        return wrap;
    },

    renderStreetDone() {
        const row = document.createElement("div");
        row.className = "actionButtons";

        const isRiver = this.state.street === "river";
        const label = isRiver ? "Showdown — resolve pot" : `Deal ${Betting.streetLabel(Betting.STREETS[Betting.STREETS.indexOf(this.state.street) + 1])}`;

        row.appendChild(this.button(label, "actionAdvance", () => {
            if (isRiver) {
                this.hooks.resolvePot();
                return;
            }
            this.commit(`dealing the ${Betting.streetLabel(Betting.STREETS[Betting.STREETS.indexOf(this.state.street) + 1]).toLowerCase()}`, () => Betting.closeStreet(this.state));
        }));

        return row;
    },

    renderHandOver() {
        const row = document.createElement("div");
        row.className = "actionButtons";
        const live = Betting.liveSeats(this.state);
        const winner = live.length === 1 ? HoldemState.displayName(live[0].player, live[0].index) : null;

        row.appendChild(this.button(
            winner ? `Award pot to ${winner}` : "Resolve pot",
            "actionAdvance",
            () => this.hooks.resolvePot()
        ));
        return row;
    },
};

if (typeof module !== "undefined" && module.exports) {
    module.exports = ActionBar;
}