// Adaptive waits for the walk. Every step used to sleep a fixed interval
// sized for its worst case — 414 seconds of them in the mock list and 223 in
// the phone's, over half of a round's twenty-three minutes. This polls a
// fingerprint of the page and the app's own state instead, and goes on once
// both have stopped moving.
//
// Applied on its own, after a chain clears, so it never rides inside a
// round's commit.
const fs = require('fs');
const root = process.env.SS_ROOT || 'F:/Coding/SoulStream/';
let p, s;
const load = (file) => { p = file; s = fs.readFileSync(root + p, 'utf8'); };
const save = () => fs.writeFileSync(root + p, s);
const once = (a) => {
    const i = s.indexOf(a);
    if (i < 0) throw new Error('missing in ' + p + ': ' + a.slice(0, 90));
    if (s.indexOf(a, i + 1) >= 0) throw new Error('ambiguous in ' + p + ': ' + a.slice(0, 90));
    return i;
};
const rep = (a, b) => { once(a); s = s.replace(a, () => b); };

load('tests/mobile/smoke.mjs');
if (s.includes('function settle(')) throw new Error('the walk already waits adaptively — nothing to do');

const A_LOOP = `        for (const s of steps) {`;
const A_SLEEP = `            await sleep(s.wait || 500);`;
once(A_LOOP);
once(A_SLEEP);

rep(A_LOOP, `        /* ── waiting only as long as it takes ───────────────────────────
           Every step used to sleep its declared wait, sized for the worst
           case it might ever meet. At 632 steps that was over half of a
           round: 414 seconds declared in the mock list, 223 in the phone's.

           So: poll something cheap until it stops changing, then go on. The
           fingerprint reads the shape of the page AND the app's own moving
           parts, because a step can be waiting on work that has not reached
           the DOM yet — a resolve in flight, a transfer arriving, a command
           that will only show itself in a toast.

           Two properties keep this honest:

           · It can only ever SHORTEN a wait, never lengthen one. The
             declared wait is the ceiling, so a step that passes today still
             gets every millisecond it got before.
           · There is a floor. A page can be momentarily quiet in the middle
             of work — a backend write with nothing visible behind it looks
             settled the instant it is asked — so nothing is probed before a
             third of its declared wait has passed.

           \`hold: true\` on a step opts out and sleeps the whole wait, for
           the handful that are waiting on something nothing here can see. */
        const FINGERPRINT = \`(function () {
            try {
                var t = document.querySelector('.toast');
                var ss = window.__ss || {};
                var pl = ss.player || {}, rs = ss.resolver || {}, nt = ss.net || {}, lb = ss.lib || {};
                return [
                    document.querySelectorAll('*').length,
                    document.images.length,
                    (document.querySelector('.screen') || {}).className || '',
                    (document.querySelector('.sheet') || {}).className || '',
                    (document.querySelector('.halfsheet') || {}).className || '',
                    t ? t.textContent.slice(0, 40) : '',
                    document.title,
                    pl.status, pl.phase, Math.round(pl.position || 0),
                    (pl.queue || []).length, pl.qi,
                    rs.active ? 1 : 0, nt.busy ? 1 : 0, lb.loading ? 1 : 0,
                    (ss.transfers && ss.transfers.items ? ss.transfers.items.length : 0)
                ].join('|');
            } catch (e) { return 'unreadable'; }
        })()\`;
        /* two identical readings 90ms apart, and nothing has moved */
        const STABLE_READINGS = 2;
        const POLL_MS = 90;
        const FLOOR = 0.34;
        let waited = 0, saved = 0;   /* what the walk actually spent, and what it did not */
        async function settle(want, step) {
            waited += want;
            if (step && step.hold) { await sleep(want); return; }
            const began = Date.now();
            await sleep(Math.min(want, Math.max(200, Math.round(want * FLOOR))));
            let last = null, stable = 0;
            while (Date.now() - began < want) {
                let fp;
                try { fp = await cdp.evaluate(FINGERPRINT); } catch { break; }
                if (fp === last) { if (++stable >= STABLE_READINGS) break; } else { stable = 0; last = fp; }
                const left = want - (Date.now() - began);
                if (left <= 0) break;
                await sleep(Math.min(POLL_MS, left));
            }
            saved += Math.max(0, want - (Date.now() - began));
        }
        for (const s of steps) {`);

rep(A_SLEEP, `            await settle(s.wait || 500, s);`);

/* The tally, printed where `saved` and `waited` are provably in scope: the
   comment below sits in the same block as the loop, at the same indent. */
rep(`        /* ── the restart half of session restore, on the phone only ──────`,
`        console.log("waits: " + Math.round(saved / 1000) + "s of " + Math.round(waited / 1000) + "s declared was not spent");

        /* ── the restart half of session restore, on the phone only ──────`);
save();

console.log('the walk waits adaptively now');