Memoria anual con columnas a ras

// ═══ Postext Cookbook · Nº 037 · Annual report with flush columns ═══════════════════════
// https://postext.dev/en/cookbook/annual-report-flush-columns
// Code: MIT · Text: original (CC BY 4.0) · Art: drawn in code · Typefaces: SIL OFL 1.1
// Fonts: Brygada 1918, Epilogue, Spline Sans Mono, Mrs Saint Delafield · Needs postext ≥ 1.4.1
import {
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const LANG = 'en'; // @lang: the language of the sample document ('en' | 'es')
const RECIPE = 'annual-report-flush-columns';

// ─── 1 · Design ─────────────────────────────────────────────────────────────
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// ─── 2 · Content ────────────────────────────────────────────────────────────
// #region data: one object for the cover, both charts and the income statement
const DATA = {
  // Output in MWh at the export meter, January to December 2025.
  wind: [560, 520, 450, 330, 270, 210, 190, 150, 300, 420, 480, 540], // Harrow Down
  sun: [90, 160, 300, 440, 560, 600, 580, 500, 380, 250, 120, 70], // the Saltings + 21 roofs
  // The turbines' year, % of the hours of both machines: [label, share, palette colour].
  hours: [['generating', 78.0, 'wind'], ['waiting for wind', 16.8, 'rule'], ['bearing repair', 2.6,
    'coral'], ['servicing and grid', 1.8, 'sun'], ['stopped for bats', 0.8, 'ink']],
  // Output by site in MWh: [site, source, capacity in MW, 2025, 2024].
  sites: [['Harrow Down', 'wind', 1.8, 4420, 4560], ['The Saltings', 'solar', 3.2, 3190, 2640],
    ['21 roofs', 'solar', 0.9, 860, 790]],
  // £ thousand, [label, 2025, 2024]; a label alone opens a group, '=' prints the running sum.
  accounts: [['Income'], ['Electricity sold under the power purchase agreement', 760, 722],
    ['Electricity sold to roof hosts', 92, 85], ['Feed-in tariff', 236, 229], ['=Total income'],
    ['Operating costs'], ['Operation and maintenance', -231, -198],
    ['Rent, rates and insurance', -158, -151], ['Staff and administration', -121, -112],
    ['Depreciation', -286, -286], ['=Operating surplus'],
    ['Interest on the Harrow Down loan', -54, -66], ['Interest on members’ shares at 3.5%', -113,
      -107], ['Grants to the Tidewell Fund', -84, -70], ['Corporation tax', -5, -7],
    ['=Surplus for the year']],
};
const fill = { background: col('tint') }; // totals sit on a tint between two hairlines
const right = (content, extra) => ({ content, align: 'right', ...extra });
const figure = (n, digits = 0) => n.toLocaleString('en-GB', { minimumFractionDigits: digits });
const head = (c, i) => (i ? right(c, { isHeader: true }) : { content: c, isHeader: true });
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const pad = '\u00a0\u2060';
const money = (n) => (n < 0 ? `(${figure(-n)})` : `${figure(n)}${pad}`);
function statement(rows) {
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// #endregion

// Charts and tables numbered through the report, tables captioned above; marks go unnumbered.
const type = (id, name, extra) => ({ id, name, captionPrefix: name,
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const resourceTypes = [type('chart', 'Chart'), type('table', 'Table', { captionStyle:
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const svg = (id, typeId, fileId, [width, height], extra) => ({ id, typeId, kind: 'svg',
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const table = (id, model, { styleId, ...extra }) => ({ id, typeId: 'table', kind: 'table',
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const resources = [
  svg('ribbons', 'mark', 'ribbons.svg', [2100, 1280], { altText: 'A teal and a yellow ribbon '
    + 'swell and cross from January to December with the wind and sun output.' }),
  svg('monthly', 'chart', 'monthly.svg', [1760, 560], { placement: { position: 'bottom',
    span: 'page' }, note: 'Measured at the export meters. Turbine 2 stood still 4–23 August.',
  caption: 'Output by month in 2025, in megawatt-hours: :swatch{color="wind"} wind at Harrow '
    + 'Down and :swatch{color="sun"} sun on the Saltings and the 21 roofs.',
  altText: 'Paired bars by month: wind falls from 560 MWh in January to 150 in August, sun peaks '
    + 'at 600 in June.' }),
  svg('hours', 'chart', 'hours.svg', [845, 470], { placement: { position: 'top' },
    caption: 'How the two turbines spent the 17,520 hours of their year.',
    altText: DATA.hours.map(([label, share]) => `${label} ${share.toFixed(1)}%`).join(', ') }),
  svg('signature', 'mark', 'signature.svg', [420, 150], { placement: { position: 'here',
    width: 0.42 }, altText: 'The chair’s signature.' }),
  table('sites', siteTable(DATA.sites), { placement: { position: 'top' }, // the house style
    caption: 'Output by site, in megawatt-hours.' }),
  table('accounts', statement(DATA.accounts), { placement: { position: 'bottom', span: 'page' },
    caption: 'Income statement for the year to 31 December.', styleId: 'statement',
    note: 'Audited. Figures in brackets are costs; the full accounts are available on request.' }),
];

const markdown = String.raw`---
Muestra en Markdown · 125 líneas · content.en.md
title: "Tidewell Community Energy"
subtitle: "Annual report and accounts 2025"
author: "Tidewell Community Energy"
---

# Tidewell Community Energy {style="cover" year="2025" strap="Annual report and accounts" period="For the year to 31 December 2025" note="The cover draws our output month by month, January to December: wind in teal, sun in yellow. Tidewell is a fictional co-operative, and every name and figure in this report is invented. Set in Brygada 1918, Epilogue, Spline Sans Mono and Mrs Saint Delafield (SIL OFL)."}

:::part{number="01" title="The year"}
:::

# The wind and the sun \\ took turns {kicker="From the chair" standfirst="Output rose 6% to 8.47 gigawatt-hours, 188 people joined the co-op and the Tidewell Fund gave £84,000 to 23 projects in the town."}

Dear members,

Last January the turbines on Harrow Down had their windiest month since we put them up in 2015, and in June the panels on the Saltings and on 21 roofs around the town made more electricity than in any month we have metered. Together they made 8.47 gigawatt-hours in the year, 6% more than in 2024. At the regulator’s figure of 2,700 kilowatt-hours for a typical home, that is the yearly use of about 3,100 households, more than there are in Tidewell itself.

The board was most pleased by how evenly the output was spread over the year. The turbines are strongest from October to March and the panels from April to September, and in 2025 each covered for the other so well that no month fell below 600 megawatt-hours. The operations report shows the two side by side.

:::callout{type="figures" span="page" title="2025 in three numbers"}
:::columns{count=3 breaks="3,5"}
:::paragraphs{style="figure"}
**8.47 GWh**
:::

generated by our turbines and panels, 6% more than in 2024

:::paragraphs{style="figure"}
**2,316**
:::

members at 31 December, 188 of them new this year

:::paragraphs{style="figure"}
**£84,000**
:::

granted by the Tidewell Fund to 23 projects in the town
:::
:::

The costliest setback came in August, when the main bearing of turbine 2 began to fail and the machine stood still for 19 days while a crane crew replaced it. Our insurer paid most of the bill, but the part it did not cover, together with the lost output, is the main reason why the surplus is a little smaller than last year’s. The treasurer explains the effect on the accounts in her report.

Membership grew to 2,316 by the end of December. In all, 188 people joined, most of them through the share offer we ran with the three primary schools in May, and 31 withdrew their shares, nearly all of them because they had moved away. Our youngest member is nine; her shares were a birthday present. We paid 3.5% interest on shares for the eighth year running. The Tidewell Fund, which takes a share of each year’s surplus, made 23 grants worth £84,000. They paid for loft insulation in the scout hut and the chapel hall, a library of electric cargo bikes and a warm-homes advice service that visited 140 households last winter.

In the coming year we will ask you to approve our largest investment since the Saltings: a battery beside the solar field that stores 2 megawatt-hours, so that we can sell the midday output in the evening, when the grid pays most for it. The district council gave planning permission in November. The board will present the business case at the annual general meeting on 14 May, and members will decide there by a simple majority.

Volunteers read the 21 roof meters every month, and eleven of them share the shifts on our stall at the Saturday market. Thank you to them, to the staff in the office on Quay Street, and to every member for trusting the co-op with their savings. I look forward to seeing many of you in May.

::resource{id="signature"}

:::paragraphs{style="signoff"}
Maren Coles, chair of the board
:::

:::part{number="02" title="Operations" palette="band=#1c6e67"}
:::

# Harrow Down, the Saltings \\ and 21 roofs {kicker="Operations report" standfirst="How two wind turbines, a solar field and the panels on schools, halls and the fire station ran in 2025. By Dev Okafor, operations manager."}

Our three sites generated 8,470 megawatt-hours of electricity in 2025, up from 7,990 the year before (:ref{id="monthly"}). The turbines made 4,420 of them and the panels 4,050: it is the first year in which the sun came within a tenth of the wind. Every figure in this report is measured at the export meter, and the box overleaf explains what that means.

## Harrow Down

The two 900-kilowatt turbines ran at an average capacity factor of 28.0%, against 28.8% in 2024. January was their windiest month since they were commissioned in 2015, at 560 megawatt-hours, with a gust of 31 metres a second recorded at hub height on the 24th. The storm cost us nothing but a tripped breaker at the substation, reset within the hour.

:::callout{type="aside" span="page" placement="top" title="How we count a kilowatt-hour"}
:::columns{count=2 breaks="2"}
Every site has two meters. The turbines and inverters log what they generate, and a meter owned by the grid operator records what leaves the site. The figures in this report are the second kind: what the grid bought from us, after the site’s own use and the losses in cables and transformers, which come to about 2% at Harrow Down.

The grid operator reads the export meters every half hour, and each month we check its readings against our own logs. Where the two disagree by more than 1%, the operator’s reading stands, because it is the one we are paid for. Roof hosts are billed from their own meters, read by a volunteer on the first Saturday of each month.
:::
:::

Turbine 2 lost 19 days in August. A vibration alarm on 4 August led to an inspection that found spalling on the races of the main bearing, and we stopped the machine rather than risk the gearbox behind it. The replacement came from the manufacturer’s store in Bremen, a crane crew fitted it in two days of calm weather, and the turbine was back in service on 23 August. Turbine 1 ran through the summer, stopping only for its scheduled service in June.

## The Saltings and the roofs

The solar field produced 3,190 megawatt-hours from its 3.2 megawatts of panels, or 997 kilowatt-hours for every kilowatt installed, its best since it opened in 2019. June was the strongest month on record for our panels, at 600 megawatt-hours across all sites.

On the 21 roofs the panels made 860 megawatt-hours (:ref{id="sites"}). The three largest roofs were:

- Tidewell Academy, 212 megawatt-hours;
- the leisure centre, 148;
- the fire station, 61.

Roof hosts used 610 megawatt-hours on site, at 15p a kilowatt-hour, well below what a supplier would charge, and the rest went to the grid.

In March a hailstorm cracked 38 panels at Saltmarsh Primary. The installer replaced them under warranty within a fortnight.

## Availability

The turbines were available for 94.8% of the hours in the year, down from 97.9% in 2024 (:ref{id="hours"}). The hours they could not run, counted across both machines, were lost to:

- the bearing repair on turbine 2, 2.6% of the year;
- servicing and grid outages, 1.8%;
- the summer nights stopped for bats, 0.8%: both turbines stop on warm, calm nights from May to September, when bats feed around the towers, as the planning consent requires.

For the rest of the year the turbines were either generating, 78.0% of the hours, or waiting with the wind below the 3 metres a second they need to start turning. The maintenance contract with the manufacturer guarantees 97% availability, and it pays us for the output lost below that level: £21,000 for 2025, which appears in the accounts as a reduction in maintenance costs.

## Grid limits

On eleven sunny afternoons in May and June the distribution network operator asked us to cap the Saltings’ export at half its capacity while it rebuilt the overhead line at Marsh End. It paid us for the 64 megawatt-hours we could not export, at the price in our power purchase agreement; they are left out of this report’s output figures. The rebuilt line can carry the field’s full output, so the caps should not return.

## The sites

Nobody was hurt at work on our sites in 2025, our tenth year without a lost-time accident. A flock of 140 Southdown ewes kept the grass short under the panels on the Saltings from March to October; they belong to a farmer in the next parish, who pays no rent for the grazing. In June the ecologist’s survey counted 31 skylark territories in the field margins, against 24 before the field was built. Three schools and a Scout group came to the open day at Harrow Down in September.

## The year ahead

Turbine 1 is due the ten-year inspection of its gearbox in April, and we have booked the work for a week with a low wind forecast. On the Saltings we will replace the fence along the sea wall, which the winter tides have undermined in two places, and plant the hawthorn hedge that the planning consent asked for. If members approve the battery in May, the connection works would start in the autumn, and the battery could be storing the field’s midday output by the summer of 2027.

:::part{number="03" title="Finances" palette="band=#b0452c"}
:::

# Paying 3.5% and still \\ adding to reserves {kicker="Treasurer’s report" standfirst="Income rose 5% to £1.09 million. After interest, grants and tax, the co-op kept a surplus of £36,000. By Alison Pryce, treasurer."}

Our income for the year was £1,088,000, 5% more than in 2024 (:ref{id="accounts"}). Almost all of the increase came from selling more electricity: the price set in our power purchase agreement hardly changed at its review in April.

Costs rose by £49,000. Operation and maintenance came to £231,000, £33,000 more than in 2024: the bearing repair cost us £54,000 after insurance, and the manufacturer’s availability guarantee paid back £21,000.

Out of an operating surplus of £292,000, the co-op paid £54,000 of interest on the loan that built Harrow Down, which ends in 2031, and £113,000 of interest on members’ shares. The board then gave £84,000 to the Tidewell Fund and £5,000 went in corporation tax, leaving £36,000 to add to reserves.

## Cash and reserves

At the end of the year the co-op held £612,000 in cash, of which £400,000 is set aside for the gearbox overhauls due in 2027 and 2028. Members’ share capital stood at £3.24 million: the 188 new members bought £94,000 of shares and the 31 who left withdrew £64,000.
`; // content.<lang>.md, inlined by the Cookbook

// #region art: the cover's ribbons and the charts, drawn from DATA with the page's palette
const MONTHS = ['J', 'F', 'M', 'A', 'M', 'J', 'J', 'A', 'S', 'O', 'N', 'D'];
const n2 = (v) => +v.toFixed(2);
// An SVG drawn as an image cannot see the page's web fonts (gotcha: svg-no-webfonts), so each
// drawing carries its face inline, as a data URL of the Fontsource file.
async function inlineFace(family, weight) {
  const id = family.toLowerCase().replace(/\s+/g, '-');
  const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-latin-${weight}`
    + '-normal.woff2';
  const bytes = new Uint8Array(await (await fetch(url)).arrayBuffer());
  let bin = '';
  for (const b of bytes) bin += String.fromCharCode(b);
  return `<style>@font-face{font-family:F;src:url(data:font/woff2;base64,${btoa(bin)}) `
    + `format('woff2')}text{font-family:F}</style>`;
}
// A smooth path through points (Catmull–Rom turned into cubic Béziers).
function smooth(pts) {
  let d = `M${n2(pts[0][0])} ${n2(pts[0][1])}`;
  for (let i = 0; i < pts.length - 1; i++) {
    const [p0, p1, p2, p3] = [pts[i - 1] ?? pts[i], pts[i], pts[i + 1], pts[i + 2] ?? pts[i + 1]];
    const c1 = [p1[0] + (p2[0] - p0[0]) / 6, p1[1] + (p2[1] - p0[1]) / 6];
    const c2 = [p2[0] - (p3[0] - p1[0]) / 6, p2[1] - (p3[1] - p1[1]) / 6];
    d += `C${n2(c1[0])} ${n2(c1[1])} ${n2(c2[0])} ${n2(c2[1])} ${n2(p2[0])} ${n2(p2[1])}`;
  }
  return d;
}
// The cover: each source is a ribbon as thick as its month's output; the stronger one rides
// higher, so they cross twice: in spring and in autumn. 210 × 128 mm, the months 17.5 mm apart.
function ribbonsArt(face) {
  const [W, H, MID, THICK, SPREAD] = [210, 128, 64, 0.065, 0.09]; // mm, mm per MWh
  const x = (i) => 8.75 + i * 17.5;
  const edge = (i) => [-8.75, ...DATA.wind.map((_, m) => x(m)), W + 8.75][i];
  const layer = (own, other, colour) => {
    const pts = [own[0], ...own, own[11]].map((v, i) => {
      const m = Math.min(11, Math.max(0, i - 1));
      return [edge(i), MID - (v - other[m]) * SPREAD, (v * THICK) / 2];
    });
    let strands = '';
    for (const k of [-0.66, -0.33, 0, 0.33, 0.66]) {
      strands += `<path d="${smooth(pts.map(([px, py, h]) => [px, py + k * h]))}" fill="none" `
        + `stroke="${palette.ink}" stroke-opacity="0.18" stroke-width="0.3"/>`;
    }
    const top = pts.map(([px, py, h]) => [px, py - h]);
    const bottom = pts.map(([px, py, h]) => [px, py + h]).reverse();
    return `<path d="${smooth(top)}L${smooth(bottom).slice(1)}Z" fill="${colour}" `
      + `fill-opacity="0.9"/>${strands}`;
  };
  const ticks = MONTHS.map((m, i) => `<circle cx="${x(i)}" cy="${H - 12}" r="0.7" `
    + `fill="${palette.mist}"/><text x="${x(i)}" y="${H - 5}" font-size="3" text-anchor="middle" `
    + `fill="${palette.mist}">${m}</text>`).join('');
  // Each ribbon is labelled inside the text block: the wind in February, the sun in June.
  const label = (name, m, own, other, ink) => `<text x="${x(m)}" y="${n2(MID - (own[m] - other[m])
    * SPREAD + 1.2)}" font-size="3.4" letter-spacing="0.6" text-anchor="middle" fill="${ink}">`
    + `${name}</text>`;
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${W * 10}" height="${H * 10}" `
    + `viewBox="0 0 ${W} ${H}">${face}${layer(DATA.sun, DATA.wind, palette.sun)}`
    + `${layer(DATA.wind, DATA.sun, palette.wind)}${ticks}`
    + `${label('WIND', 1, DATA.wind, DATA.sun, palette.ink)}`
    + `${label('SUN', 5, DATA.sun, DATA.wind, palette.ink)}</svg>`;
}
// Chart 1: paired bars on a 200 MWh grid, 176 × 56 mm (the width of the text block).
function monthlyArt(face) {
  const [W, H, LEFT, BASE, TOPV] = [176, 56, 12, 48, 700];
  const y = (v) => BASE - (v / TOPV) * (BASE - 2);
  const step = (W - LEFT) / 12;
  let grid = '';
  for (const v of [0, 200, 400, 600]) {
    grid += `<path d="M${LEFT} ${n2(y(v))}H${W}" stroke="${v ? palette.rule : palette.ink}" `
      + `stroke-width="${v ? 0.2 : 0.35}"/><text x="${LEFT - 2}" y="${n2(y(v) + 1)}" `
      + `font-size="2.6" text-anchor="end" fill="${palette.muted}">${v}</text>`;
  }
  const bars = MONTHS.map((m, i) => {
    const cx = LEFT + step * (i + 0.5);
    const bar = (v, dx, fill) => `<rect x="${n2(cx + dx)}" y="${n2(y(v))}" width="4.4" `
      + `height="${n2(BASE - y(v))}" fill="${fill}"/>`;
    return bar(DATA.wind[i], -4.6, palette.wind) + bar(DATA.sun[i], 0.2, palette.sun)
      + `<text x="${n2(cx)}" y="${BASE + 5}" font-size="2.8" text-anchor="middle" `
      + `fill="${palette.ink}">${m}</text>`;
  }).join('');
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${W * 10}" height="${H * 10}" `
    + `viewBox="0 0 ${W} ${H}">${face}${grid}${bars}</svg>`;
}
// Chart 2: a ring of the turbines' hours with its key beside it, 84.5 × 47 mm (one column).
function hoursArt(face) {
  const [W, H, CX, CY, R, T] = [84.5, 47, 22, 23.5, 20, 7];
  let a0 = -Math.PI / 2;
  let ring = '';
  let key = '';
  DATA.hours.forEach(([label, share, colour], i) => {
    const a1 = a0 + (share / 100) * 2 * Math.PI;
    const p = (a, r) => `${n2(CX + r * Math.cos(a))} ${n2(CY + r * Math.sin(a))}`;
    const big = a1 - a0 > Math.PI ? 1 : 0;
    ring += `<path d="M${p(a0, R)}A${R} ${R} 0 ${big} 1 ${p(a1, R)}L${p(a1, R - T)}`
      + `A${R - T} ${R - T} 0 ${big} 0 ${p(a0, R - T)}Z" fill="${palette[colour]}" `
      + `stroke="${palette.paper}" stroke-width="0.3"/>`;
    const ky = 8 + i * 7.5;
    key += `<rect x="50" y="${ky - 2.6}" width="3" height="3" fill="${palette[colour]}"/>`
      + `<text x="55" y="${ky}" font-size="2.9" fill="${palette.ink}">${share.toFixed(1)}%</text>`
      + `<text x="55" y="${ky + 3.4}" font-size="2.5" fill="${palette.muted}">${label}</text>`;
    a0 = a1;
  });
  const available = DATA.hours.slice(0, 2).reduce((sum, [, share]) => sum + share, 0); // 94.8
  const middle = `<text x="${CX}" y="${CY + 1.2}" font-size="4" text-anchor="middle" `
    + `fill="${palette.ink}">${available.toFixed(1)}%</text><text x="${CX}" y="${CY + 5}" `
    + `font-size="2.2" text-anchor="middle" fill="${palette.muted}">available</text>`;
  return `<svg xmlns="http://www.w3.org/2000/svg" width="${W * 10}" height="${H * 10}" `
    + `viewBox="0 0 ${W} ${H}">${face}${ring}${middle}${key}</svg>`;
}
// The chair's signature: her name in a script face, and the stroke she draws under it.
function signatureArt(face) {
  return '<svg xmlns="http://www.w3.org/2000/svg" width="420" height="150" viewBox="0 0 42 15">'
    + `${face}<text x="1" y="10" font-size="10" fill="${palette.band}">Maren Coles</text>`
    + '<path d="M3 13.2C14 12.1 27 12.6 40 11.3" fill="none" '
    + `stroke="${palette.band}" stroke-width="0.35" stroke-linecap="round"/></svg>`;
}
async function drawArt() {
  const [face, hand] = await Promise.all([inlineFace('Spline Sans Mono', 500),
    inlineFace('Mrs Saint Delafield', 400)]);
  await Promise.all([loadSvg('ribbons.svg', ribbonsArt(face)), loadSvg('monthly.svg',
    monthlyArt(face)), loadSvg('hours.svg', hoursArt(face)), loadSvg('signature.svg',
    signatureArt(hand))]);
}
// #endregion

// ─── 3 · Fonts ──────────────────────────────────────────────────────────────
const FONTS = { // text, display and label faces, loaded before the build (gotcha: fonts-first)
  'Brygada 1918': ['400', '400i', '700'], // 700: the list dashes
  Epilogue: ['400', '700', '800'], // 700: the crossheads; 800: the display
  'Spline Sans Mono': ['400', '400i', '500', '700'], 'Mrs Saint Delafield': ['400'] }; // signature

// ─── 4 · Build & show ───────────────────────────────────────────────────────
await loadFonts(FONTS, markdown);
await drawArt();
const doc = await buildWithFonts(() => buildDocument({ markdown, resources }, config()), markdown);
showPages(doc, { title: t({ en: 'Annual report with flush columns',
  es: 'Memoria anual con columnas a ras' }) });

Kit · core, fonts, viewer, images: igual en todas las recetas · 270 líneas
// ─── Kit ── helpers shared by every Cookbook recipe · postext.dev/cookbook ─────

// ─── Kit · core v1 ── the same in every recipe · postext.dev/cookbook ─────────
function mm(value) { return { value, unit: 'mm' }; }
function pt(value) { return { value, unit: 'pt' }; }
function em(value) { return { value, unit: 'em' }; }
/** The sample language's string: t({ en: 'Figure', es: 'Figura' }). */
function t(strings) { return strings[LANG] ?? Object.values(strings)[0]; }
/** A file in this recipe's assets folder, served from the Postext repo by jsDelivr. */
function asset(file) { return `https://cdn.jsdelivr.net/gh/drnachio/postext@main/cookbook/${RECIPE}/assets/${file}`; }

// ─── Kit · fonts v1 ── the same in every recipe · postext.dev/cookbook ────────
// Postext measures text with the faces the browser has loaded, and caches the
// widths, so every face must be ready before the first build. Faces come from
// Fontsource: the same static files the PDF embeds, so screen and PDF agree.

/** faces = { 'Family Name': ['400', '400i', '700'] }. `text` is the sample:
 *  letters beyond Latin-1 (č, ł, ő…) also load the latin-ext files. With
 *  `optional`, a face Fontsource does not ship is skipped instead of failing.
 *  Resolves to the number of faces added. */
async function loadFonts(faces, text = '', { optional = false } = {}) {
  kitStatus('Loading fonts…');
  const ranges = {
    latin: 'U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,'
      + 'U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD',
    'latin-ext': 'U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+0304,U+0308,U+0329,'
      + 'U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF',
  };
  const subsets = /[Ā-˿Ḁ-ỿ]/.test(text) ? ['latin', 'latin-ext'] : ['latin'];
  const jobs = [];
  let added = 0;
  for (const [family, specs] of Object.entries(faces)) {
    const id = fontsourceId(family);
    const meta = optional ? await fontsourceMeta(family) : null;
    for (const spec of new Set(specs)) {
      const weight = parseInt(spec, 10);
      const style = spec.endsWith('i') ? 'italic' : 'normal';
      if (hasFace(family, weight, style)) continue;
      if (optional && !(meta?.weights.includes(weight) && meta.styles.includes(style))) continue;
      for (const subset of subsets) {
        const url = `https://cdn.jsdelivr.net/npm/@fontsource/${id}@5/files/${id}-${subset}-${weight}-${style}.woff2`;
        const face = new FontFace(family, `url(${url}) format('woff2')`,
          { weight: String(weight), style, unicodeRange: ranges[subset] });
        jobs.push(face.load().then((ready) => { document.fonts.add(ready); added++; }, () => {
          if (subset === 'latin' && !optional) throw new Error(`Fontsource has no ${family} ${weight} ${style}`);
        }));
      }
    }
  }
  await Promise.all(jobs).catch((error) => { kitFail(error); throw error; });
  return added;
}

/** Runs `build` (a buildDocument or buildBundle call) and checks the faces
 *  the pages use. A regular face missing from FONTS is loaded with a warning;
 *  bold and italic variants are loaded when the family ships them. Then the
 *  measurement caches are cleared and the build runs again. */
async function buildWithFonts(build, text = '') {
  const tried = new Set();
  for (let round = 0; round < 3; round++) {
    kitStatus('Laying out…');
    await new Promise(requestAnimationFrame);          // let the status paint first
    const result = await Promise.resolve().then(build).catch((error) => { kitFail(error); throw error; });
    const wanted = { base: {}, variants: {} };
    for (const { font, base } of [result].flat().flatMap(fontStringsOf)) {
      const { family, weight, style } = parseFont(font);
      const key = `${family}|${weight}|${style}`;
      if (tried.has(key) || hasFace(family, weight, style)) continue;
      tried.add(key);
      (wanted[base ? 'base' : 'variants'][family] ??= []).push(`${weight}${style === 'italic' ? 'i' : ''}`);
    }
    if (Object.keys(wanted.base).length) {
      console.warn(`[cookbook] FONTS does not list ${JSON.stringify(wanted.base)}: loading them.`);
    }
    const added = await loadFonts(wanted.base, text) + await loadFonts(wanted.variants, text, { optional: true });
    if (added === 0) return result;
    clearMeasurementCache();
  }
  throw new Error('The fonts did not settle after three builds.');
}

/** Every font string of the layout. `base` marks a block's own face; its
 *  bold, italic and bold-italic variants are listed whether or not used. */
function fontStringsOf(doc) {
  const found = new Map();
  const walk = (node) => {
    if (!node || typeof node !== 'object') return;
    if (Array.isArray(node)) { node.forEach(walk); return; }
    for (const [key, value] of Object.entries(node)) {
      if (typeof value === 'string' && /fontString$/i.test(key)) {
        found.set(value, found.get(value) || key === 'fontString');
      } else if (value && typeof value === 'object') walk(value);
    }
  };
  walk(doc.pages);
  walk(doc.blocks);
  return [...found].map(([font, base]) => ({ font, base }));
}

/** '700 37.5px Open Sans' / 'italic 400 13px "Source Serif 4"' → { family, weight, style }.
 *  A string with no weight ('95.8px Young Serif', from a design text) is 400. */
function parseFont(font) {
  const m = /^(?:(italic|oblique)\s+)?(?:small-caps\s+)?(?:(\d+|bold|normal)\s+)?[\d.]+px\s+(.+)$/.exec(font.trim());
  if (!m) throw new Error(`Unexpected font string: ${font}`);
  const weight = m[2] === 'bold' ? 700 : !m[2] || m[2] === 'normal' ? 400 : Number(m[2]);
  return { family: m[3].replace(/^["']|["']$/g, ''), weight, style: m[1] ? 'italic' : 'normal' };
}

/** True when a loaded FontFace covers exactly this family, weight and style
 *  (document.fonts.check() is also true for families nobody declared). */
function hasFace(family, weight, style) {
  for (const face of document.fonts) {
    if (face.status !== 'loaded' || face.style !== style) continue;
    if (face.family.replace(/^["']|["']$/g, '') !== family) continue;
    const [low, high = low] = face.weight.split(' ').map(Number);
    if (weight >= low && weight <= high) return true;
  }
  return false;
}

/** Fontsource's id for a family: 'Source Serif 4' → 'source-serif-4'. */
function fontsourceId(family) { return family.toLowerCase().replace(/\s+/g, '-'); }

/** The weights and styles a family ships ({ weights: [400, 700], styles: ['normal', 'italic'] }), or null. */
function fontsourceMeta(family) {
  fontsourceMeta.cache ??= new Map();
  const id = fontsourceId(family);
  if (!fontsourceMeta.cache.has(id)) {
    fontsourceMeta.cache.set(id, fetch(`https://api.fontsource.org/v1/fonts/${id}`)
      .then((res) => (res.ok ? res.json() : null), () => null));
  }
  return fontsourceMeta.cache.get(id);
}

// ─── Kit · viewer v1 ── the same in every recipe · postext.dev/cookbook ───────
/** Shows the pages as facing spreads on a dark desk: the first page is a
 *  recto on its own, then verso | recto pairs, as in a bound book. Pages
 *  are painted when they scroll near the screen. */
function showPages(docs, { title, width = 460 } = {}) {
  const root = viewer(title);
  const pages = [docs].flat().flatMap((doc) =>
    doc.pages.map((page) => ({ doc, page, n: (doc.pageIndexOffset ?? 0) + page.index })));
  const spreads = [];
  let verso = null;
  for (const p of pages) {
    if (p.n % 2 === 1) { if (verso) spreads.push([verso, null]); verso = p; }
    else { spreads.push([verso, p]); verso = null; }
  }
  if (verso) spreads.push([verso, null]);
  const density = Math.min(window.devicePixelRatio || 1, 2);
  showPages.painter?.disconnect();
  const painter = new IntersectionObserver((entries) => {
    for (const { isIntersecting, target } of entries) {
      if (!isIntersecting) continue;
      painter.unobserve(target);
      const { doc, page } = target.postext;
      renderPageToCanvas(page, doc, target, { scale: (width * density) / page.width });
    }
  }, { rootMargin: '800px' });
  showPages.painter = painter;
  root.replaceChildren(...spreads.map((pair) => {
    const spread = document.createElement('div');
    spread.className = 'pt-spread';
    for (const p of pair) {
      const figure = document.createElement('figure');
      if (p) {
        const label = p.page.pageLabel || String(p.n + 1);
        const canvas = document.createElement('canvas');
        canvas.postext = p;
        canvas.style.aspectRatio = `${p.page.width} / ${p.page.height}`;
        canvas.setAttribute('role', 'img');
        canvas.setAttribute('aria-label', `Page ${label}`);
        const folio = document.createElement('figcaption');
        folio.textContent = label;
        figure.append(canvas, folio);
        painter.observe(canvas);
      } else figure.className = 'pt-blank';
      spread.append(figure);
    }
    return spread;
  }));
  kitStatus(`${pages.length} ${pages.length === 1 ? 'page' : 'pages'}`);
  document.documentElement.dataset.postext = 'ready';
  return pages.length;
}

/** The desk, the bar and the error reporting, created once. */
function viewer(title) {
  if (!document.getElementById('pt-kit')) {
    document.head.insertAdjacentHTML('beforeend', `<style id="pt-kit">
      :root { color-scheme: dark; }
      body { margin: 0; background: #0e1014; color: #b9bcc4; font: 13px/1.45 system-ui, sans-serif; }
      #pt-bar { position: sticky; top: 0; z-index: 1; display: flex; flex-wrap: wrap; align-items: center;
        gap: 6px 16px; padding: 10px 16px; background: rgb(14 16 20 / .92); backdrop-filter: blur(6px);
        border-bottom: 1px solid #23262d; }
      #pt-bar strong { color: #f4f1ea; font-weight: 600; }
      #pt-actions { display: flex; gap: 12px; margin-left: auto; }
      #pt-actions a, #pt-actions button { color: #d8a21a; font: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
      #pages { display: grid; justify-items: center; gap: 48px; padding: 32px 16px 72px; }
      .pt-spread { display: flex; }
      .pt-spread figure { margin: 0; width: min(460px, 44vw); }
      .pt-spread canvas { display: block; width: 100%; background: #fff;
        box-shadow: 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figure:first-child canvas { box-shadow: inset -14px 0 14px -14px rgb(0 0 0 / .18), 0 1px 2px rgb(0 0 0 / .5), 0 22px 44px -16px rgb(0 0 0 / .8); }
      .pt-spread figcaption { margin-top: 10px; text-align: center; font: 600 10px/1 system-ui, sans-serif;
        letter-spacing: .18em; text-transform: uppercase; color: #6c7079; }
      .pt-blank { visibility: hidden; }
      @media (max-width: 760px) {
        .pt-spread { flex-direction: column; gap: 32px; }
        .pt-spread figure { width: min(460px, 92vw); }
        .pt-blank { display: none; }
      }
    </style>`);
    document.body.insertAdjacentHTML('afterbegin',
      '<header id="pt-bar"><strong id="pt-title"></strong><span id="pt-status" role="status"></span><span id="pt-actions"></span></header>');
    document.getElementById('pt-title').textContent = document.title || 'Postext';
    addEventListener('error', (event) => kitFail(event.error ?? event.message));
    addEventListener('unhandledrejection', (event) => kitFail(event.reason));
  }
  if (title) document.getElementById('pt-title').textContent = title;
  return document.getElementById('pages')
    ?? document.body.appendChild(Object.assign(document.createElement('main'), { id: 'pages' }));
}

function kitStatus(text) {
  viewer();
  document.getElementById('pt-status').textContent = text;
}

function kitFail(error) {
  document.documentElement.dataset.postext = 'error';
  kitStatus(`Error: ${error?.message ?? error}`);
}

// ─── Kit · images v1 ── recipes with pictures · postext.dev/cookbook ──────────
/** Registers a photo or PNG for the canvas and keeps its bytes for the PDF.
 *  fetch → ImageBitmap never taints the canvas (a plain cross-origin <img> would). */
async function loadImage(fileId, url) {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`Image not found (${res.status}): ${url}`);
  const bytes = new Uint8Array(await res.arrayBuffer());
  registerResourceImage(fileId, await createImageBitmap(new Blob([bytes])));
  (loadImage.bytes ??= new Map()).set(fileId, bytes);
}

/** Registers SVG markup (drawn in code, or fetched) as a vector image. */
async function loadSvg(fileId, svg) {
  const img = new Image();
  img.src = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svg)}`;
  await img.decode();
  registerResourceImage(fileId, img);
  (loadImage.bytes ??= new Map()).set(fileId, new TextEncoder().encode(svg));
}

/** renderToPdf({ resourceBytes: imageBytes }) */
function imageBytes(fileId) { return loadImage.bytes?.get(fileId); }

/** renderToHtml({ resourceImageUrl: imageUrl }) */
function imageUrl(fileId) {
  const bytes = imageBytes(fileId);
  if (!bytes) return undefined;
  imageUrl.urls ??= new Map();
  if (!imageUrl.urls.has(fileId)) {
    const type = /\.svg$/i.test(fileId) ? 'image/svg+xml' : /\.png$/i.test(fileId) ? 'image/png' : 'image/jpeg';
    imageUrl.urls.set(fileId, URL.createObjectURL(new Blob([bytes], { type })));
  }
  return imageUrl.urls.get(fileId);
}

// ─── /Kit ───────────────────────────────────────────────────────────────────────