// A phone held sideways, and the three pieces of arithmetic that make the table fit on
// one.
//
// The layout audit is what proved this was broken and what proves it is fixed — it
// measures the drawn page, which is the only place a layout is really true. What is
// here is the part underneath that can be wrong on its own: which shape the bar is in,
// how much of the bottom that leaves spoken for, how a name is shortened when it will
// not fit, and how the ring is pulled back in when a puck lands past the rail.
const test = require("node:test");
const { describe } = require("node:test");
const assert = require("node:assert");
const fs = require("fs");
const path = require("path");
const { ActionBar, Render } = require("./load");

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

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

describe("which shape the bar is in", () => {
    // The layout is chosen by a media query — orientation, height and width together.
    // The one thing that must not happen is a second copy of that query in JavaScript,
    // because the first thing anybody changes is the breakpoint, in one of the two
    // places. So the stylesheet declares which layout it picked and actionBar.js reads
    // the answer back.
    const withComputed = (value, run) => {
        const host = { id: "actionBar" };
        global.getComputedStyle = el => ({
            getPropertyValue: prop => (el === host && prop === "--actionBarLayout" ? value : ""),
        });
        try { return run(host); } finally { delete global.getComputedStyle; }
    };

    test("the stylesheet says, and this reads", () => {
        assert.equal(withComputed(" rail ", host => ActionBar.isRail(host)), true);
        assert.equal(withComputed(" bar ", host => ActionBar.isRail(host)), false);
    });

    test("anything it does not recognise is the bar it has always been", () => {
        assert.equal(withComputed("", host => ActionBar.isRail(host)), false);
        assert.equal(withComputed("sidebar", host => ActionBar.isRail(host)), false);
    });

    test("and with no browser at all, likewise", () => {
        assert.equal(ActionBar.isRail(null), false);
        assert.equal(ActionBar.isRail({ id: "actionBar" }), false,
            "no getComputedStyle to ask — this runs in the unit suite too");
    });

    test("the stylesheet declares both halves of it", () => {
        // If either of these goes, isRail() quietly answers "bar" forever and the felt
        // is measured against a bar that is not underneath it.
        assert.match(CSS, /#actionBar\s*\{[^}]*--actionBarLayout:\s*bar/,
            "the default, on the base rule");
        assert.match(CSS, /--actionBarLayout:\s*rail/,
            "and the rail, inside the landscape query");
    });

    test("the rail is scoped to a phone, not to any short window", () => {
        // Above 900px the sidebar is already a right-hand column and a rail would land
        // on top of it.
        const query = CSS.match(/@media \(orientation: landscape\)[^{]*\{[\s\S]{0,400}?--actionBarLayout: rail/);
        assert.ok(query, "the rail lives in a landscape media query");
        assert.match(query[0], /max-width:\s*900px/);
        assert.match(query[0], /max-height:\s*560px/);
    });
});

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

describe("the bar lines up with the table", () => {
    // On a desktop the bar was centred on the window and the table on its own column,
    // and the sidebar takes 320px out of the right of that — so the two things a dealer
    // is looking at were 172px apart, at 960px wide and at 1600px and everywhere in
    // between, because the offset is half the sidebar and the sidebar is a constant.
    //
    // The rule that fixes it is four numbers that have to keep agreeing with four other
    // numbers, none of them anywhere near each other in the file. That is what this
    // block is for: the arithmetic is checked on the running page by measurement (bar
    // centre against table-column centre, which came out 0px off at every width), and
    // the numbers it depends on are checked here so they cannot drift apart afterwards.
    const rule = CSS.match(/@media \(min-width: 901px\) \{\s*#actionBar \{([^}]*)\}/);

    test("there is a rule, and it is scoped above the one-column breakpoint", () => {
        // Below 901px the sidebar is not a column at all — it is stacked under the table
        // — so there is nothing to lean away from and the bar is centred as it was.
        assert.ok(rule, "no min-width: 901px rule for #actionBar");
        assert.match(CSS, /@media \(max-width: 900px\)[\s\S]{0,200}#holdemLayout \{\s*grid-template-columns: 1fr;/,
            "the one-column layout should start exactly where this rule stops");
    });

    test("it leans away from the sidebar by the sidebar's own width", () => {
        assert.match(rule[1], /left:\s*var\(--sp-6\)/);
        assert.match(rule[1], /right:\s*calc\(var\(--sidebarW\)\s*\+\s*var\(--sp-5\)\s*\+\s*var\(--sp-6\)\)/);
    });

    test("and the sidebar's width is one number, not two", () => {
        // The grid draws the column and the bar leans away from it. Written out twice,
        // the day somebody widens the sidebar is the day the bar goes crooked and no
        // test says so.
        assert.match(CSS, /--sidebarW:\s*\d+px/, "the token should be declared");
        assert.match(CSS, /grid-template-columns:\s*1fr var\(--sidebarW\)/,
            "the grid should draw the column from the token");
    });

    test("no 100vw anywhere in it", () => {
        // The bar's own centring comment warns about this: on a page with a scrollbar
        // 100vw is wider than the viewport, and the overflow drags the table sideways.
        // The offsets are exact without it — see the derivation in the stylesheet.
        assert.equal(/100vw/.test(rule[1]), false, rule[1]);
    });
});

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

describe("the button seat's name", () => {
    // The dealer button's chip sits in the puck's top-right corner. Keeping the name out
    // from under it with `padding-right` takes the chip's width off *every* line of the
    // name, and the chip is on one of them: measured at 1280x900, the name box is 78px,
    // "Christopher" is 66 and fits, and on the seat holding the button it was cut to 56
    // and broke as "Christop / her". The button moves every hand, so that is a player
    // whose name reads properly for four hands and comes apart on the fifth.
    const roomy = CSS.match(/#seatsLayer:not\(\.seatsTight\) \.seat\.seatHasButton \.seatPuckName \{([^}]*)\}/);
    const float = CSS.match(/#seatsLayer:not\(\.seatsTight\) \.seat\.seatHasButton \.seatPuckName::before \{([^}]*)\}/);
    const base = CSS.match(/\n\.seat\.seatHasButton \.seatPuckName \{([^}]*)\}/);

    test("a ring with room for two lines indents only the line beside the chip", () => {
        assert.ok(roomy && float, "the roomy regime should use a float");
        assert.match(float[1], /float:\s*right/);
        assert.match(roomy[1], /padding-right:\s*0/);
    });

    test("the float is exactly one line tall", () => {
        // Tall enough to cover the chip's reach into the name, and no taller: a float
        // that spills into the second line indents that one too, which puts the whole
        // problem back.
        assert.match(float[1], /height:\s*1\.2em/);
    });

    test("break-word stands down where the float is doing the work", () => {
        // It is what stops the float working — it breaks a word to fit the short line
        // rather than letting it move past the float to the long one.
        assert.match(roomy[1], /overflow-wrap:\s*normal/);
    });

    test("a crowded ring keeps the padding, because it has only one line", () => {
        // `.seatsTight .seatPuckName` is `line-clamp: 1` on purpose, and one line has
        // nowhere to move to — the only way to keep it off the chip is to shorten it.
        // Trying the float on both cost a whole sweep to find out: the name dropped onto
        // a second line that the chip's lower half was still sitting on, and the audit
        // called it at every viewport in the list.
        assert.ok(base, "the base rule should still reserve the chip's width");
        assert.match(base[1], /padding-right:\s*22px/);
        assert.match(CSS, /\.seatsTight \.seatPuckName \{[^}]*line-clamp:\s*1/);
    });

    test("the float is as wide as the chip it stands in for", () => {
        const chip = CSS.match(/\n\.dealerChip \{[^}]*?(?<![\w-])width:\s*(\d+)px/);
        const inset = CSS.match(/\n\.dealerChip \{[^}]*?(?<![\w-])right:\s*(\d+)px/);
        const floatW = float[1].match(/width:\s*(\d+)px/);
        assert.ok(chip && inset && floatW);
        assert.equal(Number(floatW[1]), Number(chip[1]) + Number(inset[1]),
            "the float should cover the chip and the gap it is inset by");
    });
});

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

describe("how much of the bottom is spoken for", () => {
    // feltRoomFor asks one question — what is under the felt — and gets two different
    // answers depending on the layout. Under the bar it is the bar. Under the rail it is
    // the table hint and the two links, because the bar is off to the side.
    const fakeSection = (wrapBottom, sectionBottom) => {
        const wrap = {
            getBoundingClientRect: () => ({ bottom: wrapBottom }),
            parentElement: { getBoundingClientRect: () => ({ bottom: sectionBottom }) },
        };
        global.document = { getElementById: id => (id === "pokerTableWrap" ? wrap : null) };
    };

    test.afterEach(() => { delete global.document; });

    test("it is the gap under the felt, links and all", () => {
        fakeSection(300, 342);
        assert.equal(ActionBar.roomBelowFelt(), 42);
    });

    test("a difference, not a height — so it does not chase the felt it is sizing", () => {
        // The wrap's own height comes from --feltRoomPx, which is what this feeds. Read
        // as "how tall is everything under the felt" off the section's height it would
        // move every time the felt did, and settle nowhere.
        fakeSection(300, 342);
        const first = ActionBar.roomBelowFelt();
        fakeSection(500, 542);   // the felt grew by 200; what is under it did not
        assert.equal(ActionBar.roomBelowFelt(), first);
    });

    test("nothing under the felt is nothing to reserve", () => {
        fakeSection(300, 300);
        assert.equal(ActionBar.roomBelowFelt(), 0);
    });

    test("and a section that measures shorter than its own child is not negative room", () => {
        fakeSection(300, 288);
        assert.equal(ActionBar.roomBelowFelt(), 0);
    });

    test("with no table on the page it asks for nothing", () => {
        global.document = { getElementById: () => null };
        assert.equal(ActionBar.roomBelowFelt(), 0);
    });

    test("the felt gets the height the bar used to take", () => {
        // The whole point, in one line. At 640x360 the bar was 205px of a 360px window
        // and the felt got 85. Beside the table instead, the same window gives the felt
        // everything but the header and the links.
        const asABar = ActionBar.feltRoomFor(360, 205, 70);
        const asARail = ActionBar.feltRoomFor(360, 30, 70);
        assert.ok(asARail > asABar * 2, `${asABar}px became ${asARail}px`);
    });
});

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

describe("a name that will not fit", () => {
    // Shortened at a word, not chopped in the middle of one. A puck is 34px of text on
    // a nine-handed phone, and what the ellipsis produced for the four names on the test
    // table was "Christo…", "Mike / from…", "Alexan…". Only one of those is throwing
    // away something the dealer does not need: he is Mike, and the rest of it is how
    // this table tells him from the other Mike.
    //
    // The label element is faked here rather than measured. What is under test is the
    // ladder — which words go, in what order, and when it stops — and the browser's part
    // is one boolean per pass.
    const label = (text, fits) => {
        const el = {
            textContent: text,
            title: "",
            // The browser's answer, standing in for a real one: this name fits if
            // `fits` says the version currently written to it does.
            get scrollWidth() { return fits(this.textContent) ? 10 : 100; },
            get clientWidth() { return 10; },
            get scrollHeight() { return 10; },
            get clientHeight() { return 10; },
            querySelector: () => el,
        };
        return el;
    };

    const layer = (labels) => ({
        children: labels,
        childElementCount: labels.length,
    });

    const seatsNamed = (...names) => {
        Render.state = { seats: names.map(name => ({ name })) };
    };

    test.afterEach(() => { Render.state = null; });

    test("trailing words go until it fits", () => {
        const el = label("Christopher John Robinson", text => text === "Christopher John");
        seatsNamed("Christopher John Robinson");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Christopher John");
    });

    test("and it will go all the way to the first word", () => {
        const el = label("Christopher John Robinson", text => text === "Christopher");
        seatsNamed("Christopher John Robinson");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Christopher");
    });

    test("a name never ends on a word a name cannot end on", () => {
        // Dropping "work" off "Mike from work" leaves "Mike from", which is not a
        // shorter name — it is a name that looks cut off, and it reads worse than the
        // ellipsis this was meant to replace. He is Mike.
        const el = label("Mike from work", () => false);
        seatsNamed("Mike from work");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Mike");
    });

    test("and it takes a run of them in one go", () => {
        const el = label("Al with the hat", () => false);
        seatsNamed("Al with the hat");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Al");
    });

    test("but a joining word inside a name is nobody's business", () => {
        // The list is closed and small on purpose: it is not trying to understand names,
        // only the handful of English joining words people label each other with at a
        // home game. Anything it doesn't know stays, which is the safe way to be wrong —
        // a name that keeps a word it could have dropped is merely long.
        const el = label("Katarzyna Nowak Kowalska", text => text === "Katarzyna Nowak");
        seatsNamed("Katarzyna Nowak Kowalska");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Katarzyna Nowak");
    });

    test("dropping never goes below the first word", () => {
        // Every word after the first being a joining word is not a real name, but it is
        // typeable, and it must not come out empty.
        assert.equal(Render.dropAWord(["Mike", "from", "of", "the"], 4), 1);
        assert.equal(Render.dropAWord(["from", "the"], 2), 1);
        assert.equal(Render.dropAWord(["Mike"], 1), 1, "one word has nothing to drop");
    });

    test("a single word is left to the ellipsis it always had", () => {
        // There is no honest way to shorten "Christopher" that a dealer glancing across
        // a table would read faster than "Christo…".
        const el = label("Christopher", () => false);
        seatsNamed("Christopher");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Christopher", "never cut mid-word here");
    });

    test("a name that fits is not touched", () => {
        const el = label("Mike from work", () => true);
        seatsNamed("Mike from work");
        Render.fitSeatNames(layer([el]));
        assert.equal(el.textContent, "Mike from work");
    });

    test("the whole name is on the tooltip whether it was shortened or not", () => {
        // A label clamped to two lines was already hiding some of it before any of this.
        const shortened = label("Mike from work", text => text === "Mike");
        const untouched = label("Bob", () => true);
        seatsNamed("Mike from work", "Bob");
        Render.fitSeatNames(layer([shortened, untouched]));
        assert.equal(shortened.title, "Mike from work");
        assert.equal(untouched.title, "Bob");
    });

    test("every seat is written to before any of them is measured", () => {
        // Three passes over all the seats, not a loop per seat: each pass writes to
        // every puck and then reads back from every puck, so the browser lays the felt
        // out three times whatever the table's size. Interleaved, nine seats would cost
        // nine layouts, and this runs on every render.
        const reads = [];
        const watched = (text, fits) => {
            const el = label(text, fits);
            Object.defineProperty(el, "scrollWidth", {
                get() { reads.push(this.textContent); return fits(this.textContent) ? 10 : 100; },
            });
            return el;
        };
        const a = watched("Christopher John Robinson", t => t === "Christopher");
        const b = watched("Katarzyna Nowak Kowalska", t => t === "Katarzyna");
        seatsNamed("Christopher John Robinson", "Katarzyna Nowak Kowalska");
        Render.fitSeatNames(layer([a, b]));

        // Both names are read at each length before either is written down again.
        assert.deepEqual(reads.slice(0, 2),
            ["Christopher John Robinson", "Katarzyna Nowak Kowalska"]);
        assert.deepEqual(reads.slice(2, 4), ["Christopher John", "Katarzyna Nowak"]);
        assert.equal(a.textContent, "Christopher");
        assert.equal(b.textContent, "Katarzyna");
    });

    test("an empty chair has no name to shorten", () => {
        const el = label("", () => false);
        seatsNamed("");
        assert.doesNotThrow(() => Render.fitSeatNames(layer([el])));
    });

    test("and with no layer there is nothing to do", () => {
        assert.doesNotThrow(() => Render.fitSeatNames(null));
    });
});

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

describe("pulling the ring back onto the table", () => {
    // seatRingRadii works out the widest ring whose outermost puck still finishes inside
    // the rail, and it is right about that — but it is right about a puck it measured
    // before the ring moved, before the width search settled, and before a name was
    // shortened or wrapped to a second line. Each of those changes a puck's height by up
    // to 15px after the arithmetic is done.
    //
    // Measured on the running page, four of the thirteen viewports finished with the top
    // seat 5-6px past the rail. Not a wrong formula: a stale input to a right one. So
    // the ring is settled the way the audit judges it, by looking at where the pucks
    // actually landed.
    //
    // The felt is 400x400 at (100, 100) throughout. Seats are placed by writing a
    // percentage into style.left/top, which this reads back to work out where the puck
    // would be — the same relationship the browser has, without a browser.
    const felt = { left: 100, top: 100, right: 500, bottom: 500, width: 400, height: 400 };

    const seat = (puckW, puckH, box) => ({
        style: { left: "", top: "" },
        classList: { toggle() {} },
        getBoundingClientRect() {
            // Whatever percentage was last written, resolved against the ring box.
            const cx = box.left + (parseFloat(this.style.left) / 100) * box.width;
            const cy = box.top + (parseFloat(this.style.top) / 100) * box.height;
            return {
                left: cx - puckW / 2, right: cx + puckW / 2,
                top: cy - puckH / 2, bottom: cy + puckH / 2,
                width: puckW, height: puckH,
            };
        },
    });

    // The ring box the percentages resolve against, deliberately the same as the felt so
    // the arithmetic in the test stays readable.
    const ringBox = { ...felt };

    const setUp = (count, puckW, puckH) => {
        const seats = Array.from({ length: count }, () => seat(puckW, puckH, ringBox));
        Render.state = { seats: seats.map(() => ({ name: "" })), seatCount: count };
        global.document = { getElementById: id => (id === "pokerTable"
            ? { getBoundingClientRect: () => felt }
            : { getBoundingClientRect: () => ringBox }) };
        // ringBox() reads #seatsLayer; the fake above hands the same box back for it.
        return { children: seats, childElementCount: seats.length };
    };

    const place = (layer, radii) => {
        for (let i = 0; i < layer.childElementCount; i++) {
            Render.placeSeat(layer.children[i], i, 1, radii);
        }
    };

    const worstOverhang = layer => {
        let over = 0;
        for (let i = 0; i < layer.childElementCount; i++) {
            const b = layer.children[i].getBoundingClientRect();
            over = Math.max(over, felt.left - b.left, b.right - felt.right,
                felt.top - b.top, b.bottom - felt.bottom);
        }
        return over;
    };

    test.afterEach(() => { Render.state = null; delete global.document; });

    test("a ring already inside the rail is left exactly where it is", () => {
        const layer = setUp(6, 60, 50);
        const radii = { rx: 30, ry: 30 };
        place(layer, radii);
        assert.deepEqual(Render.settleSeatsOnTable(layer, 1, radii), radii);
    });

    test("a puck past the rail brings the whole ring in", () => {
        // 44% of 400 puts a seat's centre 176px from the middle; half a 60px puck is
        // another 30, against a felt whose half-height is 200. Six pixels over, at the
        // top and the bottom and both sides — which is the size the running page was
        // actually wrong by.
        const layer = setUp(4, 60, 60);
        const radii = { rx: 44, ry: 44 };
        place(layer, radii);
        assert.equal(Math.round(worstOverhang(layer)), 6, "the fault is there to fix");

        const settled = Render.settleSeatsOnTable(layer, 1, radii);
        assert.ok(settled.ry < radii.ry, "the ring came in");
        assert.ok(worstOverhang(layer) <= Render.SEAT_SETTLE_SLACK_PX,
            `still ${worstOverhang(layer).toFixed(1)}px over`);
    });

    test("it comes in by what it was over, not by a step it guessed", () => {
        const layer = setUp(4, 60, 60);
        const radii = { rx: 44, ry: 44 };
        place(layer, radii);
        const over = worstOverhang(layer);
        const settled = Render.settleSeatsOnTable(layer, 1, radii);
        // Six pixels of a 400px felt is 1.5% of the ring, so 44 becomes 42.5 — the
        // measurement, not a step size that would have to be tuned per screen.
        assert.equal(settled.ry.toFixed(2), (44 - (over / felt.height) * 100).toFixed(2));
        assert.equal(settled.ry, 42.5);
    });

    test("and it stops at the floor rather than collapsing into the pot", () => {
        // A puck taller than the felt has an overhang no ring can fix. Pulling in
        // forever would put every seat on top of the pot badge, which is a worse table
        // than one with a puck touching the rail.
        const layer = setUp(4, 60, 600);
        const radii = { rx: 40, ry: 40 };
        place(layer, radii);
        const settled = Render.settleSeatsOnTable(layer, 1, radii);
        assert.equal(settled.ry, Render.RING_MIN_R);
        assert.ok(settled.ry > 0);
    });

    test("a table with nothing laid out yet is handed back untouched", () => {
        Render.state = { seats: [], seatCount: 0 };
        global.document = { getElementById: () => null };
        const radii = { rx: 44, ry: 42 };
        assert.deepEqual(Render.settleSeatsOnTable({ children: [], childElementCount: 0 }, 1, radii), radii);
    });

    test("it is bounded — this runs after every tap a dealer makes", () => {
        assert.ok(Render.SEAT_SETTLE_PASSES <= 2,
            "each pass is a forced layout of the whole felt");
        assert.ok(Render.SEAT_NAME_PASSES <= 3);
    });
});