/* sizing.js — the machine estimator (/gepigeny, /en/sizing).
 *
 * THE RULE lives in guestMib(), minBoxGb() and estimate() below, and nowhere else on the site. Every number it
 * uses comes from /assets/sizing-data.json (built by scripts/build_sizing_web.py from the 2026-10-13 N100
 * measurement); this file holds none of its own — scripts/test_build_sizing_web.py checks that.
 *
 *   typical = platform + sum of the selected apps' typical figures
 *   peak    = platform + sum of their peaks (all at peak at once: pessimistic on purpose)
 *   per box size: guest memory by the installer's rule (guestMib), then
 *     well   peak * headroom <= guest
 *     tight  peak <= guest < peak * headroom
 *     no     guest < peak
 *   the memory bar: minBoxGb() inverts guestMib() by SEARCHING it — the smallest box memory whose guest
 *   holds peak * headroom (the bar's length) and peak (thin marker). It never restates the installer's rule.
 *   v3: the bar is split into what that box memory is used for, every part from the same rule:
 *     base system = box - guest(box) · Felhom = platform · each app = its peak · spare = guest(box) - peak
 *   so the parts add up to the box exactly (scripts/test_build_sizing_web.py proves it).
 *   v3.1: the bar is never drawn for a box smaller than the smallest size the page names (boxes_gb[0]);
 *   below it, the installer's ceiling clause would show a base system no real box has.
 *
 * The page text is not here: each page carries its own strings (#sizer-strings), so this file is the
 * same for both languages.
 */
(function (root) {
    'use strict';

    function guestMib(data, gb) {
        var r = data.guest_rule;
        var total = gb * 1024 - r.memtotal_shortfall_mib;
        var mem = total - r.reserve_mib;
        if (mem > total - r.max_gap_mib) { mem = total - r.max_gap_mib; }
        if (mem < r.min_mib) { mem = r.min_mib; }
        if (mem > total - r.ceiling_gap_mib) { mem = total - r.ceiling_gap_mib; }
        return mem;
    }

    // The smallest box memory (GB, not rounded to a product size) whose guest holds needMib. guestMib() never
    // decreases as the box grows, so a bisection on it is exact to 1 MiB; it uses the forward rule only.
    function minBoxGb(data, needMib) {
        var lo = 0, hi = 1;
        while (guestMib(data, hi) < needMib) { hi = hi * 2; }
        while (hi - lo > 1 / 1024) {
            var mid = (lo + hi) / 2;
            if (guestMib(data, mid) >= needMib) { hi = mid; } else { lo = mid; }
        }
        return hi;
    }

    function estimate(data, slugs) {
        var bySlug = {};
        data.apps.forEach(function (a) { bySlug[a.slug] = a; });
        var typical = data.platform_mb, peak = data.platform_mb, busy = [], unmeasured = [];
        slugs.forEach(function (s) {
            var a = bySlug[s];
            if (!a || a.builtin) { return; }
            typical += a.typical_mb;
            peak += a.peak_mb;
            if (a.cpu_class === 'medium' || a.cpu_class === 'heavy-in-bursts') { busy.push(a); }
            if (!a.measured) { unmeasured.push(a); }
        });
        var boxes = data.boxes_gb.map(function (gb) {
            var guest = guestMib(data, gb);
            var verdict = peak * data.headroom <= guest ? 'well' : (peak <= guest ? 'tight' : 'no');
            return { gb: gb, guest_mb: guest, verdict: verdict };
        });
        var recommend = null, tightBox = null;
        boxes.forEach(function (b) {
            if (recommend === null && b.verdict === 'well') { recommend = b.gb; }
            if (tightBox === null && b.verdict === 'tight') { tightBox = b.gb; }
        });
        var heavy = busy.filter(function (a) { return a.cpu_class === 'heavy-in-bursts'; });
        var wellGb = minBoxGb(data, peak * data.headroom);
        var barGb = Math.max(wellGb, data.boxes_gb[0]);
        var boxMb = barGb * 1024, guestMb = guestMib(data, barGb);
        var apps = slugs.map(function (s) { return bySlug[s]; })
            .filter(function (a) { return a && !a.builtin; })
            .sort(function (x, y) { return y.peak_mb - x.peak_mb; });
        var segments = [{ kind: 'base', mb: boxMb - guestMb }, { kind: 'platform', mb: data.platform_mb }];
        apps.forEach(function (a) { segments.push({ kind: 'app', app: a, mb: a.peak_mb }); });
        segments.push({ kind: 'spare', mb: guestMb - peak });
        return {
            typical_mb: typical, peak_mb: peak, boxes: boxes, busy: busy, heavy: heavy, unmeasured: unmeasured,
            well_gb: wellGb, bar_gb: barGb, tight_gb: minBoxGb(data, peak),
            recommend_gb: recommend, tight_box_gb: tightBox,
            segments: segments, base_mb: boxMb - guestMb, apps_peak_mb: peak - data.platform_mb
        };
    }

    root.FelhomSizing = { estimate: estimate, guestMib: guestMib, minBoxGb: minBoxGb };

    /* ---------------------------------------------------------------- the page (drawing only) */
    if (typeof document === 'undefined') { return; }

    function el(tag, cls, txt) {
        var e = document.createElement(tag);
        if (cls) { e.className = cls; }
        if (txt !== undefined) { e.textContent = txt; }
        return e;
    }

    function icon(name, cls) {
        var ns = 'http://www.w3.org/2000/svg';
        var s = document.createElementNS(ns, 'svg');
        s.setAttribute('class', cls || 'ico');
        s.setAttribute('aria-hidden', 'true');
        var u = document.createElementNS(ns, 'use');
        u.setAttribute('href', '/assets/icons.svg?v=1#' + name);
        s.appendChild(u);
        return s;
    }

    function start() {
        var host = document.getElementById('sizer');
        var strEl = document.getElementById('sizer-strings');
        if (!host || !strEl) { return; }
        var T = JSON.parse(strEl.textContent);
        var lang = document.documentElement.lang === 'en' ? 'en' : 'hu';
        var dec = function (v) { var s = v.toFixed(1); return lang === 'hu' ? s.replace('.', ',') : s; };
        var gbText = function (mb) { return dec(mb / 1024) + ' GB'; };
        var appsBox = document.getElementById('sizer-apps');
        var meter = document.getElementById('sizer-meter');
        var line = document.getElementById('sizer-line');
        var result = document.getElementById('sizer-result');
        var stack = document.getElementById('sizer-stack');
        var legend = document.getElementById('sizer-legend');
        var why = document.getElementById('sizer-why-line');
        var typicalLine = document.getElementById('sizer-typical');
        // English needs "an 8 GB machine"; the article comes from the page's strings (none in Hungarian)
        var article = function (gb) { return (T.an_before || []).indexOf(String(gb)) !== -1 ? T.an : T.a; };
        var fill = function (tpl, gb) { return tpl.replace('{a}', article(gb) || '').replace('{gb}', gb); };

        fetch(host.getAttribute('data-src')).then(function (r) { return r.json(); }).then(function (data) {
            var max = data.bar_max_gb;
            meter.setAttribute('aria-valuemax', String(max));
            var groups = [];

            // the bar's marks: positions from the data, the last one reads "64+"
            var scale = document.getElementById('sizer-scale');
            data.bar_marks_gb.forEach(function (gb, i) {
                var m = el('span', 'sizer-mark', gb + (i === data.bar_marks_gb.length - 1 ? '+' : '') + ' GB');
                m.style.left = (gb / max * 100) + '%';
                scale.appendChild(m);
            });

            // one fold-out per category, all closed at first
            data.categories.forEach(function (c) {
                var d = el('details', 'sizer-cat');
                var sum = el('summary', 'sizer-cat-head');
                sum.appendChild(el('span', 'sizer-cat-name', lang === 'en' ? c.name_en : c.name_hu));
                var count = el('span', 'sizer-cat-count');
                sum.appendChild(count);
                sum.appendChild(icon('i-chevron-down', 'ico sizer-chevron'));
                d.appendChild(sum);
                var body = el('div', 'sizer-cat-body');
                data.apps.filter(function (a) { return a.category === c.id; }).forEach(function (a) {
                    var lab = el('label', 'sizer-app');
                    var cb = el('input');
                    cb.type = 'checkbox';
                    cb.value = a.slug;
                    if (a.builtin) { cb.checked = true; cb.disabled = true; }
                    lab.appendChild(cb);
                    lab.appendChild(el('span', 'sizer-app-name', lang === 'en' ? a.name_en : a.name_hu));
                    var tag = a.builtin ? T.builtin : (lang === 'en' ? a.tagline_en : a.tagline_hu);
                    if (tag) { lab.appendChild(el('span', 'sizer-app-tag', tag)); }
                    body.appendChild(lab);
                });
                d.appendChild(body);
                appsBox.appendChild(d);
                groups.push({ details: d, count: count });
            });

            function selected() {
                return Array.prototype.map.call(appsBox.querySelectorAll('input[type=checkbox]:checked:not(:disabled)'),
                    function (c) { return c.value; });
            }

            function draw() {
                var r = estimate(data, selected());

                groups.forEach(function (g) {
                    var n = g.details.querySelectorAll('input[type=checkbox]:checked:not(:disabled)').length;
                    g.count.textContent = n ? T.selected.replace('{n}', n) : '';
                });

                // the bar: its length is the "fits well" box memory, split into what that memory is used for
                // (estimate().segments); beyond the colour count the smallest apps join one segment
                var basis = Math.max(r.bar_gb, max) * 1024;
                var segs = [], rest = { kind: 'more', mb: 0, n: 0 }, nApps = 0;
                var appCount = r.segments.filter(function (sg) { return sg.kind === 'app'; }).length;
                // group the smallest only when TWO or more are left over; a single leftover keeps its name
                // (in the group's colour — no ninth palette colour)
                var group = appCount - data.bar_app_colours >= 2;
                r.segments.forEach(function (sg) {
                    if (sg.kind === 'app') {
                        nApps += 1;
                        if (nApps > data.bar_app_colours) {
                            if (group) { rest.mb += sg.mb; rest.n += 1; return; }
                            sg.colour = 'sizer-seg-more';
                        } else {
                            sg.colour = 'sizer-c' + nApps;
                        }
                    }
                    if (sg.kind === 'spare' && rest.n) { segs.push(rest); }
                    segs.push(sg);
                });
                var label = function (sg) {
                    if (sg.kind === 'app') { return lang === 'en' ? sg.app.name_en : sg.app.name_hu; }
                    if (sg.kind === 'more') { return T.seg_more.replace('{n}', sg.n); }
                    return T['seg_' + sg.kind];
                };
                stack.textContent = '';
                legend.textContent = '';
                segs.forEach(function (sg) {
                    var cls = sg.kind === 'app' ? sg.colour : 'sizer-seg-' + sg.kind;
                    var part = el('div', 'sizer-seg ' + cls);
                    part.style.width = (sg.mb / basis * 100) + '%';
                    part.title = label(sg) + ': ' + Math.round(sg.mb) + ' MB';
                    stack.appendChild(part);
                    var li = el('li', 'sizer-legend-item');
                    li.appendChild(el('span', 'sizer-dot ' + cls));
                    li.appendChild(el('span', '', label(sg) + ' '));
                    li.appendChild(el('span', 'sizer-num', gbText(sg.mb)));
                    legend.appendChild(li);
                });
                var tli = el('li', 'sizer-legend-item');
                tli.appendChild(el('span', 'sizer-dot sizer-seg-tightmark'));
                tli.appendChild(el('span', '', T.seg_tight + ' '));
                tli.appendChild(el('span', 'sizer-num', dec(r.tight_gb) + ' GB'));
                legend.appendChild(tli);
                document.getElementById('sizer-tight').style.left = (Math.min(r.tight_gb / max, 1) * 100) + '%';
                var over = r.well_gb > max;
                var needText = over ? T.over_max.replace('{gb}', max) : dec(r.well_gb) + ' GB';
                meter.setAttribute('aria-valuenow', String(Math.min(r.well_gb, max).toFixed(1)));
                meter.setAttribute('aria-valuetext', T.meter_text.replace('{x}', needText));

                // one line: which box to buy, and where it is tight
                var biggest = data.boxes_gb[data.boxes_gb.length - 1];
                if (r.recommend_gb !== null) {
                    line.textContent = fill(T.recommend, r.recommend_gb) +
                        (r.tight_box_gb !== null ? ' ' + fill(T.tight_on, r.tight_box_gb) : '');
                } else if (r.tight_box_gb !== null) {
                    line.textContent = fill(T.only_tight, r.tight_box_gb);
                } else {
                    line.textContent = fill(T.none_fits, biggest);
                }

                // under the bar: totals, why tight is tight, the CPU lines
                result.textContent = '';
                // the explaining sentence: three numbers, all from the rule; bold parts are {b}…{/b}
                why.textContent = '';
                var tpl = r.apps_peak_mb > 0
                    ? (r.recommend_gb !== null ? T.why : T.why_over)
                    : T.why_empty;
                var spare = Math.round((data.headroom - 1) * 100);
                tpl.replace('{peak}', dec(r.peak_mb / 1024)).replace('{base}', dec(r.base_mb / 1024))
                    .replace('{base_platform}', dec((r.base_mb + data.platform_mb) / 1024))
                    .replace('{spare}', spare).replace('{rec}', r.recommend_gb === null ? max : r.recommend_gb)
                    .split(/\{b\}|\{\/b\}/).forEach(function (part, i) {
                        why.appendChild(i % 2 ? el('strong', 'sizer-num', part) : document.createTextNode(part));
                    });
                typicalLine.textContent = T.typical_line.replace('{typical}', gbText(r.typical_mb)).replace('{peak}', gbText(r.peak_mb));
                if (r.tight_box_gb !== null) { result.appendChild(el('p', 'sizer-why', T.tight_why)); }

                if (r.busy.length) {
                    result.appendChild(el('h3', 'sizer-sub', T.cpu_head));
                    var cl = el('ul', 'sizer-cpu');
                    r.busy.forEach(function (a) {
                        var li = el('li');
                        li.appendChild(el('strong', '', (lang === 'en' ? a.name_en : a.name_hu) + ': '));
                        li.appendChild(el('span', '', lang === 'en' ? a.cpu_note_en : a.cpu_note_hu));
                        cl.appendChild(li);
                    });
                    if (r.heavy.length >= 2) {
                        cl.appendChild(el('li', 'sizer-pair', T.heavy_pair.replace('{names}', r.heavy.map(function (a) {
                            return lang === 'en' ? a.name_en : a.name_hu;
                        }).join(T.and))));
                    }
                    result.appendChild(cl);
                }
                if (r.unmeasured.length) {
                    result.appendChild(el('p', 'sizer-why', T.unmeasured + ': ' + r.unmeasured.map(function (a) {
                        return lang === 'en' ? a.name_en : a.name_hu;
                    }).join(', ')));
                }
            }

            appsBox.addEventListener('change', draw);
            Array.prototype.forEach.call(document.querySelectorAll('[data-preset]'), function (btn) {
                btn.addEventListener('click', function () {
                    var want = (btn.getAttribute('data-preset') || '').split(',').filter(Boolean);
                    groups.forEach(function (g) {
                        var any = false;
                        Array.prototype.forEach.call(g.details.querySelectorAll('input[type=checkbox]:not(:disabled)'), function (c) {
                            c.checked = want.indexOf(c.value) !== -1;
                            if (c.checked) { any = true; }
                        });
                        if (any) { g.details.open = true; }
                    });
                    draw();
                });
            });
            host.hidden = false;
            draw();
        }).catch(function () {
            line.textContent = T.load_error;
            host.hidden = false;
        });
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', start);
    } else {
        start();
    }
})(this);