/* sizing.js — the machine estimator (/gepigeny, /en/sizing).
 *
 * THE RULE lives in estimate() and guestMib() 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: guest memory by the installer's rule, then
 *     well   peak * headroom <= guest
 *     tight  peak <= guest < peak * headroom
 *     no     guest < peak
 *
 * 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;
    }

    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 heavy = busy.filter(function (a) { return a.cpu_class === 'heavy-in-bursts'; });
        return { typical_mb: typical, peak_mb: peak, boxes: boxes, busy: busy, heavy: heavy, unmeasured: unmeasured };
    }

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

    /* ---------------------------------------------------------------- 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) {
        var ns = 'http://www.w3.org/2000/svg';
        var s = document.createElementNS(ns, 'svg');
        s.setAttribute('class', '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 gbText = function (mb) {
            var v = (mb / 1024).toFixed(1);
            return (lang === 'hu' ? v.replace('.', ',') : v) + ' GB';
        };
        var appsBox = document.getElementById('sizer-apps');
        var result = document.getElementById('sizer-result');

        fetch(host.getAttribute('data-src')).then(function (r) { return r.json(); }).then(function (data) {
            data.categories.forEach(function (c) {
                var fs = el('fieldset', 'sizer-group');
                fs.appendChild(el('legend', '', lang === 'en' ? c.name_en : c.name_hu));
                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);
                    var name = el('span', 'sizer-app-name', lang === 'en' ? a.name_en : a.name_hu);
                    lab.appendChild(name);
                    var tag = a.builtin ? T.builtin : (lang === 'en' ? a.tagline_en : a.tagline_hu);
                    if (tag) { lab.appendChild(el('span', 'sizer-app-tag', tag)); }
                    fs.appendChild(lab);
                });
                appsBox.appendChild(fs);
            });

            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());
                result.textContent = '';
                var totals = el('p', 'sizer-totals');
                totals.appendChild(el('span', '', T.typical + ': '));
                totals.appendChild(el('strong', 'sizer-num', gbText(r.typical_mb)));
                totals.appendChild(el('span', '', ' · ' + T.peak + ': '));
                totals.appendChild(el('strong', 'sizer-num', gbText(r.peak_mb)));
                result.appendChild(totals);
                result.appendChild(el('p', 'sizer-fine', T.platform_note));

                var ul = el('ul', 'sizer-boxes');
                r.boxes.forEach(function (b) {
                    var li = el('li', 'sizer-box sizer-' + b.verdict);
                    var head = el('div', 'sizer-box-head');
                    head.appendChild(icon(b.verdict === 'well' ? 'i-check' : (b.verdict === 'tight' ? 'i-triangle-alert' : 'i-x')));
                    head.appendChild(el('strong', 'sizer-box-size', b.gb + ' GB'));
                    head.appendChild(el('span', 'sizer-verdict', T.verdict[b.verdict]));
                    li.appendChild(head);
                    li.appendChild(el('p', 'sizer-fine', T.guest.replace('{x}', gbText(b.guest_mb))));
                    if (b.verdict === 'tight') { li.appendChild(el('p', 'sizer-why', T.tight_why)); }
                    ul.appendChild(li);
                });
                result.appendChild(ul);

                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);
                    Array.prototype.forEach.call(appsBox.querySelectorAll('input[type=checkbox]:not(:disabled)'), function (c) {
                        c.checked = want.indexOf(c.value) !== -1;
                    });
                    draw();
                });
            });
            host.hidden = false;
            draw();
        }).catch(function () {
            result.textContent = T.load_error;
            host.hidden = false;
        });
    }

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