// What the ring is allowed to be sized from.
//
// resolveSeatLayout buys its answer with ten forced layouts — ten candidate widths, each
// applied to the felt and read back — and caches it against this signature. So the
// signature has to move whenever a puck's height can, and must not move otherwise: one
// that changed on every action would throw the cache away on every tap, which is the
// whole cost it exists to avoid.
//
// It used to name four things: every player's name, the dealer's seat, whether anybody
// had hole cards, and whether anybody had chips out. Three of those flip during an
// ordinary hand. A dealer calling a bet paid ten forced layouts for it, and so did the
// next street closing, and so did editing a name.
//
// None of them can change a puck's height any more. The stylesheet holds three rows open
// — name, amount, stack — at a height that does not depend on what is written in them:
// the name gets one line whatever it says, the amount pill keeps its row when it is
// empty, and the dealer's chip changes a padding rather than a line count. What is left
// is the hole-card row, which still collapses, because whether a table tracks hole cards
// is something it decides once rather than something that changes under a thumb.
//
// The other half of that bargain is in renderSeats: it measures the finished pucks
// against the box the search settled on and asks again if they disagree. That is what
// makes a wrong assumption here a stale frame rather than a stale session — and it is
// what catches the first render of all, where the pucks are built empty and the search
// that used to run against them was measuring nine blank boxes.
const test = require("node:test");
const { describe } = require("node:test");
const assert = require("node:assert");
const { Render, HoldemState, makeTable } = require("./load");

// seatShapeSignature reads Render.state, so a table has to be hung on it first.
const signatureOf = state => {
    const before = Render.state;
    Render.state = state;
    try { return Render.seatShapeSignature(); } finally { Render.state = before; }
};

const table = () => makeTable({ seatCount: 6, stack: 200 });

describe("the signature the ring layout is cached against", () => {
    test("moves when a hole card is entered", () => {
        // The one row still allowed to collapse, and the one thing still worth
        // re-measuring for: a puck with cards on it is about 15px taller.
        const state = table();
        const none = signatureOf(state);
        state.seats[0].cards = ["AS", "KC"];
        assert.notEqual(signatureOf(state), none);
    });

    test("but not again for the second player to be dealt one", () => {
        // The point of a boolean over the table. The ring is sized from the tallest puck
        // on it, so once anybody has cards the answer cannot change.
        const state = table();
        state.seats[0].cards = ["AS", "KC"];
        const first = signatureOf(state);
        state.seats[1].cards = ["2H", "7D"];
        assert.equal(signatureOf(state), first);
    });

    test("and it stands still while the chips move", () => {
        // The expensive one. Somebody has money out for most of every hand and which
        // seats it is changes on every action, so this used to be a ten-layout re-search
        // twice a hand — and the pucks it was re-measuring for are the same height now
        // whether there is an amount in them or not.
        const state = table();
        const quiet = signatureOf(state);
        state.seats[1].committed = 10;
        assert.equal(signatureOf(state), quiet,
            "the amount pill holds its row whether or not it has an amount in it");
        state.seats[2].committed = 250;
        assert.equal(signatureOf(state), quiet);
    });

    test("nor when an amount merely changes size", () => {
        const state = table();
        state.seats[1].committed = 10;
        const small = signatureOf(state);
        state.seats[1].committed = 999999;
        assert.equal(signatureOf(state), small,
            "a wider number is the amount fitter's problem, not the ring's");
    });

    test("and it stands still for a rename", () => {
        // Renaming used to be able to wrap a name onto a second line. A name gets one
        // line now, and one that does not fit drops a word or steps its type down — see
        // fitSeatNames. Neither moves the row it sits in.
        const state = table();
        const base = signatureOf(state);
        state.seats[0].name = "Bartholomew Fairweather";
        assert.equal(signatureOf(state), base);
    });

    test("and for the button moving round the table", () => {
        // The chip in the puck's corner takes 22px off the name's line. That is a
        // narrower name, not a taller puck, so the ring it sits on is the same ring.
        const state = table();
        const base = signatureOf(state);
        state.dealerSeatIndex = (state.dealerSeatIndex + 1) % state.seats.length;
        assert.equal(signatureOf(state), base);
    });
});

describe("a table nobody has sat down at", () => {
    test("carries no flag at all", () => {
        // The empty-table case is the one the collapse is most visible on, and it is
        // also the one where a stray default could quietly keep the row open forever.
        const state = HoldemState.createDefault();
        HoldemState.resizeSeats(state, 9);
        assert.equal(signatureOf(state), "",
            "an untouched table should carry nothing");
    });

    test("and neither does one with an ante on it", () => {
        // computeContribution answers for a seat that has never been given a stack — the
        // table's base pot stands in for it — so a table dealt with "everyone antes 5"
        // has amounts on its pucks before anybody acts. That used to have to be in here.
        // The pucks are the same height with it as without, so it does not any more.
        const state = HoldemState.createDefault();
        HoldemState.resizeSeats(state, 6);
        state.basePotAmount = 5;
        state.seats.forEach(p => { p.inHand = true; });
        assert.equal(signatureOf(state), "");
    });
});

// ---------------------------------------------------------------------------

// The other half: the stylesheet has to actually hold those rows open, or the signature
// above is a promise about a puck that doesn't exist.
//
// Read as text, the way the seat sheet's rules and the reduced-motion rules are. What
// height a row is, is a decision that lives in the file — the browser is where it is
// proved, and runUiAudit.js is what proves it there.
const fs = require("fs");
const path = require("path");

const CSS = fs.readFileSync(
    path.join(__dirname, "..", "..", "JoshHeaps.Net", "wwwroot", "css", "casino", "holdem.css"), "utf8");

const ruleFor = selector => {
    const escaped = selector.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
    const found = CSS.match(new RegExp(`(^|[},])\\s*${escaped}\\s*\\{([^}]*)\\}`, "m"));
    return found ? found[2] : null;
};

describe("every puck on the ring is the same puck", () => {
    test("each of the three rows is a row high whether or not it says anything", () => {
        // A blank label had no height at all, so the one puck with nobody in it was the
        // one puck a different size from the rest — and a seat that had put chips in was
        // a different size again from one that hadn't.
        ["name", "total", "stack"].forEach(row => {
            const selector = `.seatPuck${row[0].toUpperCase()}${row.slice(1)}`;
            const body = ruleFor(selector) || "";
            assert.match(body, /min-height:\s*var\(--seatRow(Name|Money)\)/,
                `${selector} does not hold its row open`);
        });
    });

    test("and the row heights are tokens, not ems", () => {
        // fitAmount steps a tournament stack's type down so every digit stays on the
        // puck, and .puckNameTight does the same to a name with no word to drop. In ems
        // each of those would have taken its row down with it, and the puck with it.
        ["--seatRowName", "--seatRowMoney"].forEach(token =>
            assert.match(CSS, new RegExp(`\\${token}:\\s*\\d+px`), `${token} is not a fixed height`));
    });

    test("the amount pill hides its paint rather than giving up its place", () => {
        // Collapsing it is what made a puck grow 17px when its player called and shrink
        // again when the street closed. Painting an empty pill is what collapsing it was
        // introduced to stop — an 8x11px green lozenge on seven of nine seats, standing
        // for nothing. Neither, now: the row stays and the pill is not drawn.
        assert.match(ruleFor(".seatPuckTotal:empty") || "", /visibility:\s*hidden/);
        assert.doesNotMatch(ruleFor(".seatPuckTotal:empty") || "", /display:\s*none/);
    });

    test("but the hole-card row still collapses, because a table decides that once", () => {
        // Holding 15px open on nine seats all night for a row most tables never fill is
        // the crowding this is meant to avoid, and it is the one thing left that the
        // signature above still watches for.
        assert.match(ruleFor(".seatPuckCards:empty") || "", /display:\s*none/);
    });

    test("an empty pill sits on its top edge, not on a baseline it hasn't got", () => {
        // An inline-block sits on its last line's baseline, and an empty one has no last
        // line — so it sits on its bottom edge instead and the line box comes out 2px
        // shorter than the same pill with a figure in it. That put the seats with money
        // out 2px below everyone else: the one difference this row exists to remove,
        // reappearing as its own mirror image.
        assert.match(ruleFor(".seatPuckTotal") || "", /vertical-align:\s*top/);
    });
});

// ---------------------------------------------------------------------------

describe("and the ring checks its own measurement afterwards", () => {
    // The signature above is an assumption about what can change a puck. This is what
    // happens when the assumption is wrong, and it is also what happens on the first
    // render of all: buildSeatNodes puts nine empty pucks on the felt and the search runs
    // before anything is written into them, so it was measuring nine blank boxes and
    // caching the answer under a key naming a table it had never seen.
    //
    // That used to be permanent. The comment where it was cached said "let the resize
    // that follows do this properly" — and nothing resizes a phone. A table opened
    // upright kept a ring measured for empty seats until the dealer turned the phone
    // sideways and back, which is the only thing that ever changed the key.
    const withBox = (box, run) => {
        const before = Render.measuredSeatBox;
        Render.measuredSeatBox = () => box;
        try { return run(); } finally { Render.measuredSeatBox = before; }
    };

    test("a layout that measured nothing is always asked again", () => {
        // No box on the answer means the search never had a puck in front of it.
        assert.equal(withBox({ width: 72, height: 56 }, () => Render.seatBoxMoved(null)), true);
        assert.equal(withBox({ width: 72, height: 56 }, () => Render.seatBoxMoved(undefined)), true);
    });

    test("one that measured the puck that is now on the felt is not", () => {
        assert.equal(
            withBox({ width: 72, height: 56 }, () => Render.seatBoxMoved({ width: 72, height: 56 })),
            false);
    });

    test("and a pixel of difference is a rounding artefact, not a table that moved", () => {
        // The two measurements are taken at different moments. Without the slack this
        // would ask the search to run again on every render for the rest of the session,
        // which is ten forced layouts a tap — the exact cost the cache exists to avoid.
        assert.equal(
            withBox({ width: 72.4, height: 56.4 }, () => Render.seatBoxMoved({ width: 72, height: 56 })),
            false);
        assert.equal(
            withBox({ width: 72, height: 58 }, () => Render.seatBoxMoved({ width: 72, height: 56 })),
            true, "two pixels taller is a puck that has changed shape");
    });

    test("nothing on the felt to measure is not a reason to ask again", () => {
        // Between a table being resized and the new pucks being built there is a moment
        // with no seats at all. Asking again there would clear a good answer and replace
        // it with one measured from nothing.
        assert.equal(withBox(null, () => Render.seatBoxMoved({ width: 72, height: 56 })), false);
    });
});

// ---------------------------------------------------------------------------

describe("how much room a figure has on the puck it is written on", () => {
    // The two steps of type an amount comes down used to be chosen by counting
    // characters: eight for the first, ten for the second. That is a guess at how wide a
    // figure is, and it happens to hold at one text size and one puck width.
    //
    // Turn a phone's text up — 20px of root text is what an Android slider gives you at
    // 125%, and every size in the stylesheet is in `rem` on purpose — and it stops
    // holding. Measured at 360x640 twelve-handed: the puck is at its 44px floor, which
    // is 34px of usable width, and "$1,200" is six characters, took no step at all, and
    // wanted 38. The sweep caught it as a stack figure painted over the seat next door
    // at every phone in the list, and as "ALL IN" doing the same on the all-in table.
    //
    // So it is measured. A cell is a stand-in for the real one: what it wants against
    // what it has, and a class list to write the answer into.
    const cell = (figure, wants, has) => ({
        dataset: { figure },
        textContent: figure,
        classes: new Set(),
        classList: {
            add(name) { this.owner.classes.add(name); },
            remove(name) { this.owner.classes.delete(name); },
        },
        // What the text wants is proportional to how many characters are in it and how
        // far down the ladder it has come — which is what a browser would tell us.
        get scrollWidth() {
            const step = this.classes.has("puckAmountHuge") ? 0.7
                : this.classes.has("puckAmountLong") ? 0.85 : 1;
            return Math.round((wants * this.textContent.length / figure.length) * step);
        },
        clientWidth: has,
    });

    const make = (...args) => {
        const c = cell(...args);
        c.classList.owner = c;
        return c;
    };

    const fit = cells => {
        const before = Render.overflowing;
        Render.overflowing = el => el.scrollWidth > el.clientWidth + 1;
        try { Render.fitAmounts(cells); } finally { Render.overflowing = before; }
    };

    test("a figure that fits is left at the size it is meant to be read at", () => {
        const c = make("$600", 30, 34);
        fit([c]);
        assert.equal(c.textContent, "$600");
        assert.deepEqual([...c.classes], []);
    });

    test("one that doesn't gives up its separators first", () => {
        // Grouping is a reading aid for a column of figures. This is one number on a
        // 44px puck, and a step of type costs more than the commas do.
        const c = make("$1,200", 38, 34);
        fit([c]);
        assert.equal(c.textContent, "$1200");
        assert.deepEqual([...c.classes], [], "no type step needed once the commas are out");
    });

    test("then a step of type, and then another", () => {
        const c = make("$1,234,567", 90, 34);
        fit([c]);
        assert.equal(c.textContent, "$1234567");
        assert.deepEqual([...c.classes], ["puckAmountHuge"]);
    });

    test("and only ever one step at a time is worn", () => {
        // The two rules have the same specificity, so a puck wearing both would be sized
        // by whichever the stylesheet happens to mention last.
        const c = make("$1,234,567", 45, 34);
        fit([c]);
        assert.equal(c.classes.has("puckAmountHuge") && c.classes.has("puckAmountLong"), false);
    });

    test("a figure with no separators to give goes straight to the type", () => {
        // "ALL IN" is the one thing on this row that isn't a number, and it is the widest
        // — six characters and a space, at 700 weight with its letters spread apart.
        const c = make("ALL IN", 39, 34);
        fit([c]);
        assert.equal(c.textContent, "ALL IN");
        assert.deepEqual([...c.classes], ["puckAmountLong"]);
    });

    test("a puck that went small can come back", () => {
        // Everything is measured from the figure and the size it is meant to be read at,
        // not from whatever the last render left behind. Otherwise this is a ratchet: one
        // crowded frame and the seat is small for the rest of the night.
        const c = make("$600", 30, 34);
        c.classes.add("puckAmountHuge");
        c.textContent = "$600";
        fit([c]);
        assert.deepEqual([...c.classes], []);
    });

    test("and the grouped figure is what it comes back to", () => {
        const c = make("$1,200", 38, 34);
        fit([c]);
        assert.equal(c.textContent, "$1200");
        c.clientWidth = 96;
        fit([c]);
        assert.equal(c.textContent, "$1,200", "a wider puck should get its separators back");
    });

    test("an empty row is not an amount", () => {
        // The pill keeps its place on a seat with nothing in the pot — that is what makes
        // every puck on the ring the same puck — and there is nothing there to fit.
        const c = make("", 0, 34);
        assert.doesNotThrow(() => fit([c]));
        assert.deepEqual([...c.classes], []);
    });
});