/* Where the phone's frames go.

   Attaches to the app on the connected phone, then times the frames the
   WebView actually produced (a requestAnimationFrame log in the page) while
   the harness scrolls a long list, pushes a record page, opens the player
   and sits idle with a track playing — the moments a person feels as lag.
   Each scene runs under several CSS variants injected live, so the cost of
   an effect is measured rather than guessed: the backdrop blurs behind the
   chrome, the artwork ambience, the entrance animations.

     node tests/mobile/perf.mjs            every scene × every variant
     node tests/mobile/perf.mjs --quick    the base variant only

   Frames over 32 ms are two dropped frames at 60 Hz; the p90 says how the
   scene feels, the max how bad the worst hitch was. */
import { attachPhone, sleep } from "./cdp.mjs";

const QUICK = process.argv.includes("--quick");
const PORT = 9222;

const VARIANTS = {
    base: "",
    "no-backdrop": `.nav,.mini,.gbar,.halfsheet{backdrop-filter:none!important;-webkit-backdrop-filter:none!important}`,
    "no-ambience": `.amb{filter:none!important}.grain{display:none!important}`,
    "no-feat-blur": `.feat .bg{filter:none!important}`,
    "no-motion": `.screen,.screen>*{animation:none!important}`,
    "no-blur-at-all": `.nav,.mini,.gbar,.halfsheet{backdrop-filter:none!important;-webkit-backdrop-filter:none!important}.amb{filter:none!important}.grain{display:none!important}.feat .bg{filter:none!important}`,
};

const FRAMES = `(function () {
    if (!window.__fm) {
        var f = { t: [], on: false };
        window.__fm = f;
        (function loop(ts) { if (f.on) f.t.push(ts); requestAnimationFrame(loop); })(0);
    }
    return true;
})()`;
const START = `(__fm.t = [], __fm.on = true, true)`;
const STOP = `(function () {
    __fm.on = false;
    var t = __fm.t, d = [];
    for (var i = 1; i < t.length; i++) d.push(t[i] - t[i - 1]);
    d.sort(function (a, b) { return a - b; });
    var n = d.length;
    if (!n) return { frames: 0 };
    var q = function (p) { return Math.round(d[Math.min(n - 1, Math.floor(n * p))]); };
    return { frames: n, p50: q(0.5), p90: q(0.9), p99: q(0.99), max: Math.round(d[n - 1]),
             over32: d.filter(function (x) { return x > 32; }).length, over100: d.filter(function (x) { return x > 100; }).length };
})()`;
const VARIANT = (css) => `(function () {
    var s = document.getElementById('__perfvar');
    if (!s) { s = document.createElement('style'); s.id = '__perfvar'; document.head.appendChild(s); }
    s.textContent = ${JSON.stringify(css)};
    return true;
})()`;

async function scrollGesture(cdp, distance) {
    /* the WebView's own scroll, through the input pipeline, not scrollBy */
    const size = await cdp.evaluate(`[innerWidth, innerHeight]`);
    await cdp.send("Input.synthesizeScrollGesture", {
        x: Math.round(size[0] / 2), y: Math.round(size[1] * 0.6),
        yDistance: distance, speed: 1400, gestureSourceType: "touch",
    });
}

/* the handle on the page has no patch(); tabs are clicked like a thumb would */
const tab = (i) => `(function(){ var b = document.querySelectorAll('.segtabs button')[${i}]; if (b) b.click(); return true; })()`;
const SCENES = [
    {
        name: "scroll tracks",
        setup: async (cdp) => { await cdp.evaluate(`__ss.go('library'); true`); await sleep(300); await cdp.evaluate(tab(2)); },
        run: async (cdp) => { await scrollGesture(cdp, -1800); await scrollGesture(cdp, 1800); await scrollGesture(cdp, -1800); },
    },
    {
        name: "scroll home",
        setup: async (cdp) => { await cdp.evaluate(`__ss.go('home'); true`); },
        run: async (cdp) => { await scrollGesture(cdp, -1200); await scrollGesture(cdp, 1200); },
    },
    {
        name: "push record",
        setup: async (cdp) => { await cdp.evaluate(`__ss.go('library'); true`); await sleep(300); await cdp.evaluate(tab(0)); },
        run: async (cdp) => {
            await cdp.evaluate(`(function(){ var c = document.querySelector('.grid2 .release'); if (c) c.click(); })()`);
            await sleep(900);
            await cdp.evaluate(`__ss.back(); true`);
            await sleep(700);
        },
    },
    {
        name: "open player",
        setup: async (cdp) => { await cdp.evaluate(`__ss.go('home'); true`); },
        run: async (cdp) => {
            await cdp.evaluate(`(function(){ var m = document.querySelector('.mini'); if (m) m.click(); })()`);
            await sleep(1100);
            await cdp.evaluate(`__ss.closeSheet(); true`);
            await sleep(700);
        },
    },
    {
        name: "idle, playing",
        setup: async (cdp) => { await cdp.evaluate(`__ss.go('home'); true`); },
        run: async () => { await sleep(3000); },
    },
];

async function main() {
    const { cdp } = await attachPhone(PORT);
    await cdp.send("Runtime.enable");
    await cdp.send("Performance.enable");
    const hasHandle = await cdp.evaluate(`!!window.__ss`);
    if (!hasHandle) throw new Error("no __ss handle on the page — an older build?");
    await cdp.evaluate(FRAMES);
    /* something must be playing for the lane and the ambience to cost anything */
    if (!(await cdp.evaluate(`__ss.player.status === 'playing'`))) {
        /* something must be playing for the lane and the ambience to cost anything */
        await cdp.evaluate(`__ss.go('library'); true`); await sleep(300); await cdp.evaluate(tab(0)); await sleep(300);
        await cdp.evaluate(`(function(){ var c = document.querySelector('.grid2 .release'); if (c) c.click(); })()`); await sleep(900);
        await cdp.evaluate(`(function(){ var d = document.querySelector('.rec-acts .disc'); if (d) d.click(); })()`); await sleep(1500);
        await cdp.evaluate(`__ss.back(); true`); await sleep(500);
    }

    const variants = QUICK ? ["base"] : Object.keys(VARIANTS);
    const rows = [];
    for (const scene of SCENES) {
        for (const v of variants) {
            await cdp.evaluate(VARIANT(VARIANTS[v]));
            await scene.setup(cdp);
            await sleep(900);
            const m0 = (await cdp.send("Performance.getMetrics")).result.metrics;
            await cdp.evaluate(START);
            await scene.run(cdp);
            const stats = await cdp.evaluate(STOP);
            const m1 = (await cdp.send("Performance.getMetrics")).result.metrics;
            const metric = (name) => (m1.find((x) => x.name === name)?.value ?? 0) - (m0.find((x) => x.name === name)?.value ?? 0);
            const row = {
                scene: scene.name, variant: v, ...stats,
                script: Math.round(metric("ScriptDuration") * 1000),
                style: Math.round(metric("RecalcStyleDuration") * 1000),
                layout: Math.round(metric("LayoutDuration") * 1000),
                task: Math.round(metric("TaskDuration") * 1000),
            };
            rows.push(row);
            console.log(
                scene.name.padEnd(14) + v.padEnd(16)
                + `frames ${String(row.frames).padStart(4)}  p50 ${String(row.p50).padStart(3)}  p90 ${String(row.p90).padStart(3)}  p99 ${String(row.p99).padStart(4)}  max ${String(row.max).padStart(4)}  >32ms ${String(row.over32).padStart(3)}  >100ms ${String(row.over100).padStart(2)}`
                + `   script ${row.script}ms style ${row.style}ms layout ${row.layout}ms`,
            );
        }
    }
    await cdp.evaluate(VARIANT(""));
    await cdp.evaluate(`__ss.go('home'); true`);
    cdp.close();
    return rows;
}
main().catch((e) => { console.error(e.message || e); process.exit(1); });