/**
 * Photograph the engine, for the pages that describe it.
 *
 *   node scripts/brand-assets/shots.mjs                  # everything, full size
 *   node scripts/brand-assets/shots.mjs --only fidi-night,office-floor
 *   node scripts/brand-assets/shots.mjs --preview        # fast, 1x, PNGs to look at
 *   node scripts/brand-assets/shots.mjs --manifest-only  # captions only, no browser
 *
 * `capture.mjs` next door makes the two share cards. This makes the product
 * imagery: the pictures on lumbridgecorp.com/simulate that show what the thing
 * looks like. Same harness, different framing — see `harness.mjs`.
 *
 * ### Why these are renders and not illustrations
 *
 * Every image this writes is a screenshot of the built `dist/` in this repo at
 * the commit named in the manifest. Nothing is composited, retouched, or drawn.
 * That is the whole point: /simulate/tera claims the sun is computed from your
 * clock and the city lights come on as it sets, and the honest way to
 * illustrate that claim is a photograph of it happening, taken by a script
 * anyone can re-run. `og.png` on lumbridgecorp.com spent a month advertising a
 * headline the site had stopped using, because it was a hand-made picture of a
 * page rather than a render of one. This is that lesson applied to the art.
 *
 * ### The two outputs
 *
 * **The site.** `--site <dir>` (default: the sibling `lumbridge-v4` checkout)
 * gets web-sized WebP into `apps/web/public/shots/` and a generated TypeScript
 * manifest into `apps/web/src/data/shots.ts`. The captions travel *with* the
 * images, in the manifest, so a page cannot show a caption for a picture that
 * was reframed underneath it. If the directory is not there — which is the
 * normal case for anyone who cloned this repo on its own — the step is skipped
 * with a note, because the site is Lumbridge's consumer of this script and not
 * a dependency of it.
 *
 * **The archive.** A dated folder under `shots/` keeps the full-resolution
 * frame of every shot from every run. Nothing reads it. It is there because the
 * cities keep changing and a render of the Bay from August is not recoverable
 * once the heightfield moves — the manifest can be regenerated, the past
 * cannot.
 */

import { fileURLToPath } from "node:url";
import { dirname, join, resolve } from "node:path";
import { mkdir, writeFile, access } from "node:fs/promises";
import { execFileSync } from "node:child_process";
import { serve, launch, clockShim, FURNITURE, hide } from "./harness.mjs";

const HERE = dirname(fileURLToPath(import.meta.url));
const ROOT = join(HERE, "..", "..");

// ---- The shots --------------------------------------------------------------

/**
 * `chapter` is an index into the chapter list, because that is all the DOM
 * offers — `renderLegend()` in `main.ts` builds the buttons from the city pack's
 * array and binds each to `flyToIndex(i)`, with no id on the element. `expect`
 * is the `shortLabel` that index is supposed to be, asserted before the shutter
 * opens. A city pack is data, and data gets reordered; without the assertion a
 * reordered pack silently reframes every picture on the site and captions them
 * with the old names.
 *
 * Every shot is taken **twice from the same camera**, once by day and once at
 * night, and the site loads whichever suits the theme the reader is in — a dark
 * page gets the daylit frame and a light page gets the night one, because a
 * night render on a dark page dissolves into it and a hazy noon render on a
 * white page washes out. One camera and two clocks also happens to be the
 * cheapest possible demonstration of the thing these pages claim hardest: the
 * sun is computed from a real time, not painted on.
 *
 * Times are local to the city and are chosen, not defaulted. Midday is the
 * worst light a heightfield ever gets — the sun is behind the camera, nothing
 * casts, and 83k buildings read as gravel. The daylight frames are taken in the
 * morning or late afternoon for the same reason a photographer would; the night
 * frames sit around sixteen degrees below the horizon, which is dark enough for
 * the window lights to carry the picture and not so dark that the ground has
 * gone.
 */
const SHOTS = [
  {
    id: "bay-relief",
    door: "tera",
    city: "sf",
    chapter: 0,
    expect: "Whole Board",
    place: "San Francisco Bay Area",
    caption:
      "Everything else in the engine stands on this heightfield: 83 named hills, four octaves of value noise, and overlapping peaks combined as tallest-plus-35%-of-the-rest — the one rule that makes a run of summits read as a ridge instead of stacking into a fictional mountain.",
    day: {
      at: "2026-08-06T07:40:00-07:00",
      note: "Twenty to eight, sun fifteen degrees up: low enough that the hills rake shadow across the flats and the relief reads as relief.",
      alt: "The San Francisco Bay Area seen from above in low morning light, the peninsula and the East Bay hills raking shadows across the water.",
    },
    night: {
      at: "2026-08-06T21:35:00-07:00",
      note: "Twenty-five to ten, and the same board is a scatter of lit ground between two dark ranges — the shape of the region is now where the cities are, not where the hills are.",
      alt: "The same view of the Bay Area at night, the built-up ground picked out in clusters of light between dark hills and darker water.",
    },
  },
  {
    id: "soma",
    door: "tera",
    city: "sf",
    chapter: 2,
    expect: "SoMa",
    place: "SoMa, San Francisco",
    caption:
      "South of Market, where the grid turns forty-six degrees and the blocks get long. About 83,000 buildings are on screen here, drawn as instanced geometry on street bearings the city pack declares per district.",
    day: {
      at: "2026-08-06T17:20:00-07:00",
      note: "Twenty past five.",
      alt: "Downtown San Francisco south of Market in afternoon light, towers clustered on a street grid turned at an angle to the rest of the city.",
    },
    night: {
      at: "2026-08-06T21:35:00-07:00",
      note: "Twenty-five to ten. Nothing about the geometry changed — only the hour the page was asked for.",
      alt: "The same towers south of Market at night, windows lit in a scatter across every face.",
    },
  },
  {
    id: "fidi",
    door: "tera",
    city: "sf",
    chapter: 3,
    expect: "FiDi",
    place: "Financial District, San Francisco",
    caption:
      "The old money and the venture money, stacked between Montgomery and the Embarcadero under the pyramid, with the Bay Bridge running out to the right.",
    day: {
      at: "2026-08-06T10:10:00-07:00",
      note: "Ten past ten in the morning, sun forty-four degrees up.",
      alt: "The San Francisco financial district from above in mid-morning light, the pyramid among the towers and the Bay Bridge crossing to the right.",
    },
    night: {
      at: "2026-08-06T21:40:00-07:00",
      note: "Twenty to ten, sun sixteen degrees below the horizon. The lights are not a night theme — they are emissive window faces chosen from a seeded RNG as the computed sun goes down. The moonlight carrying the ground is about five orders of magnitude brighter than the real moon-to-sun ratio, deliberately: the honest number renders a black rectangle.",
      alt: "The San Francisco financial district at night, tower windows lit from within and the ground reading dark blue rather than black.",
    },
  },
  {
    id: "peninsula",
    door: "tera",
    city: "sf",
    chapter: 6,
    expect: "Peninsula",
    place: "The Peninsula",
    caption:
      "Twenty miles of city between the water and the ridge, never more than four wide. The camera is about 32 km back — the city scene's orbit limit — which is why the region ships as five chapters rather than one impossible wide shot.",
    day: {
      at: "2026-08-06T09:20:00-07:00",
      note: "Twenty past nine, with an aircraft on approach drawing the line across the bay.",
      alt: "The San Francisco peninsula from above in morning light, the Santa Cruz mountains on one side, the bay on the other, and an aircraft trail crossing the water.",
    },
    night: {
      at: "2026-08-06T21:35:00-07:00",
      note: "Twenty-five to ten, and the ridge is legible only as the edge the lights stop at.",
      alt: "The San Francisco peninsula at night, a band of lit ground between dark water and a darker mountain ridge.",
    },
  },
  {
    id: "socal-dtla",
    door: "tera",
    city: "socal",
    chapter: 1,
    expect: "DTLA",
    place: "Downtown Los Angeles",
    caption:
      "The second city pack, on the same engine and the same renderer. A city is pure data — coastlines, hills, district street bearings, landmarks and camera chapters in one file with no code in it — so adding one is a reviewable contribution rather than a fork. The camera is square to downtown's grid, which is why everything else in the frame looks crooked.",
    day: {
      at: "2026-08-06T18:10:00-07:00",
      note: "Ten past six, the San Gabriels standing behind the basin.",
      alt: "Downtown Los Angeles from above in late afternoon light, the river running past the tower cluster and the San Gabriel mountains behind the basin.",
    },
    night: {
      at: "2026-08-06T21:20:00-07:00",
      note: "Twenty past nine. The basin is the one place on either board where the lit ground runs to the edge of the frame in every direction.",
      alt: "Downtown Los Angeles at night, the tower cluster lit and the surrounding basin covered in light to the horizon.",
    },
  },
  {
    id: "office-floor",
    door: "office",
    chapter: 0,
    expect: "The Floor",
    place: "Lumbridge HQ",
    caption:
      "The same renderer from inside: thirty-four metres by eighteen, one storey, glazed along the north edge. An Office is one building's interior and a Space is a room within it — and this cannot share a THREE.Scene with the city, because San Francisco puts one scene unit at about 94 metres and this is one unit to the metre.",
    day: {
      at: "2026-08-06T11:20:00-07:00",
      note: "Twenty past eleven in the morning.",
      alt: "A whole office interior rendered in 3D as an open-topped model, walls, desks and meeting rooms laid out across one floor, with its plan drawn beside it.",
    },
    night: {
      at: "2026-08-06T21:30:00-07:00",
      note: "Half past nine. The office keeps its own light after the sun has gone, which is the difference between a room and a landscape.",
      alt: "The same office model at night, lit from within against a dark ground.",
    },
  },
  {
    id: "office-desks",
    door: "office",
    chapter: 2,
    expect: "Desks",
    place: "Lumbridge HQ",
    caption:
      "Thirty-six seats in four benches. Stepping in here does not throw the city away — the city scene is retained and paused rather than disposed, because rebuilding the Bay's heightfield costs about 2.3 seconds and nobody should pay that to walk back out of a door.",
    day: {
      at: "2026-08-06T11:20:00-07:00",
      note: "Twenty past eleven, daylight through the glazing on the north edge.",
      alt: "A closer view inside the office: rows of desks with chairs and monitors, people seated at them, bookshelves and planting behind a partition.",
    },
    night: {
      at: "2026-08-06T21:30:00-07:00",
      note: "Half past nine, and the windows have stopped being the light source.",
      alt: "The same desks at night, lit by the office's own lighting with darkness beyond the windows.",
    },
  },
];

/** The two frames every shot is taken in, in the order they are rendered. */
const VARIANTS = ["day", "night"];

// ---- Sizes ------------------------------------------------------------------

/**
 * Shot at 2x and delivered at two widths, because the pages that use these run
 * a picture at about 720 CSS px on a desktop and full-bleed on a phone.
 *
 * WebP rather than PNG, and by a wide margin: these frames are photographs of a
 * continuous-tone render, and PNG spends about 650 KB on what WebP says in 90.
 * The encoder is the browser that is already open — this box has no `sharp`, no
 * ImageMagick and no `rsvg-convert`, which is the same constraint that made the
 * share cards a screenshot in the first place.
 */
const VIEWPORT = { width: 1440, height: 900 };
const SIZES = [
  { suffix: "1600", width: 1600, quality: 0.82 },
  { suffix: "800", width: 800, quality: 0.84 },
];
/** The archive frame: full sensor, near-lossless, kept forever. */
const ARCHIVE_QUALITY = 0.94;

// ---- Arguments --------------------------------------------------------------

function flag(name, fallback = null) {
  const i = process.argv.indexOf(`--${name}`);
  return i > -1 && process.argv[i + 1] && !process.argv[i + 1].startsWith("--")
    ? process.argv[i + 1]
    : fallback;
}

const preview = process.argv.includes("--preview");
/**
 * Rewrite the site's manifest from the shot list without opening a browser.
 *
 * A caption is prose and gets edited like prose — several times, in a row, to
 * hear how it reads. Charging three minutes of software rasterisation for each
 * pass is how a caption ends up shipped in the first wording anybody tried,
 * which is the same failure the share-card README describes. The images this
 * points at are the ones already on disk, and the commit it stamps is today's;
 * both are true, because the pictures did not change.
 */
const manifestOnly = process.argv.includes("--manifest-only");
const only = flag("only")?.split(",").map((s) => s.trim());
const siteDir = resolve(flag("site", join(ROOT, "..", "lumbridge-v4")));
const archiveRoot = resolve(flag("archive", join(ROOT, "shots")));
const wanted = only ? SHOTS.filter((s) => only.includes(s.id)) : SHOTS;

if (only) {
  const unknown = only.filter((id) => !SHOTS.some((s) => s.id === id));
  if (unknown.length) {
    console.error(`unknown shot(s): ${unknown.join(", ")}`);
    process.exit(1);
  }
}

// ---- Provenance -------------------------------------------------------------

const git = (...args) => execFileSync("git", args, { cwd: ROOT, encoding: "utf8" }).trim();
const commit = git("rev-parse", "--short", "HEAD");
/**
 * Recorded, and shown on the site. A shot taken from a working tree with
 * uncommitted changes is a picture of a build that exists on exactly one
 * machine, and the manifest should say so rather than name a commit that would
 * render something else.
 */
const dirty = git("status", "--porcelain").length > 0;
const today = new Date().toISOString().slice(0, 10);

// ---- Capture ----------------------------------------------------------------

/**
 * Re-encode a PNG buffer to WebP at a target width, using the browser as the
 * codec. `height` follows from the source aspect so a size table only has to
 * carry widths.
 */
async function encode(page, png, width, quality) {
  const dataUrl = await page.evaluate(
    async ({ b64, w, q }) => {
      const img = new Image();
      img.src = `data:image/png;base64,${b64}`;
      await img.decode();
      const canvas = document.createElement("canvas");
      canvas.width = w;
      canvas.height = Math.round((img.naturalHeight / img.naturalWidth) * w);
      const ctx = canvas.getContext("2d");
      ctx.imageSmoothingEnabled = true;
      ctx.imageSmoothingQuality = "high";
      ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
      return canvas.toDataURL("image/webp", q);
    },
    { b64: png.toString("base64"), w: width, q: quality },
  );
  return Buffer.from(dataUrl.slice(dataUrl.indexOf(",") + 1), "base64");
}

/**
 * Read a chapter button's label, and optionally press it.
 *
 * The index is all the DOM offers, so `expect` is the guard. `main.ts` renders
 * the number into its own span, hence the prefix strip.
 */
async function chapter(page, index, expect, { click = false } = {}) {
  const label = await page.evaluate(
    ({ i, press }) => {
      const button = [...document.querySelectorAll("#chapters .chapter")][i];
      if (!button) return null;
      if (press) button.click();
      return button.textContent.replace(/^\d+/, "").trim();
    },
    { i: index, press: click },
  );
  if (label === null) throw new Error(`no chapter at index ${index}`);
  if (label !== expect) {
    throw new Error(
      `chapter ${index} is "${label}", not "${expect}" — a city pack was reordered, ` +
        `so the shot list and its captions need re-checking before anything ships`,
    );
  }
}

async function shoot(browser, shot, frame) {
  const host = shot.door === "office" ? "office.lumbridgecorp.com" : "tera.lumbridgecorp.com";
  const query = shot.city ? `?city=${shot.city}` : "";
  const page = await browser.newPage({
    viewport: VIEWPORT,
    deviceScaleFactor: preview ? 1 : 2,
    /**
     * The camera cuts instead of flying, and this is the difference between a
     * shot list that takes three minutes and one that takes twelve — or worse,
     * one that quietly photographs the camera mid-flight.
     *
     * `scenekit.ts` eases a chapter change over about two seconds of *scene*
     * time, and `stage.ts` clamps `dt` to 50 ms a frame. Under SwiftShader on a
     * box with no GPU the app runs at roughly three frames a second, so those
     * two seconds take about twenty of wall clock, and any fixed wait short of
     * that lands somewhere over the bay. Reduced motion is the app's own
     * documented answer to "I only clicked a name in a list": `flyTo` calls
     * `setPose` and the pose is simply true on the next frame.
     */
    reducedMotion: "reduce",
  });
  const problems = [];
  page.on("pageerror", (e) => problems.push(String(e)));
  try {
    await page.addInitScript(clockShim(frame.at));
    await page.goto(`http://${host}:5210/${query}`, { waitUntil: "networkidle" });
    /**
     * Wait for the app to say it is up rather than for a number of seconds.
     * The terrain is built in a worker and the city is ~83k instances, and how
     * long that takes on software GL depends on the city, the machine and what
     * else is running — a fixed sleep is either wrong or wasteful, and here it
     * would have been both.
     */
    await page.waitForFunction(
      () =>
        document.getElementById("boot")?.hidden === true &&
        document.querySelectorAll("#chapters .chapter").length > 0,
      { timeout: 180_000 },
    );
    // Boot hiding means the scene exists, not that it has drawn a full frame.
    await page.waitForTimeout(preview ? 3000 : 6000);
    await chapter(page, shot.chapter, shot.expect, { click: shot.chapter > 0 });
    if (shot.chapter > 0) await page.waitForTimeout(2500);
    await hide(page, [...FURNITURE.transient, ...FURNITURE.CLUTTER]);
    const png = await page.screenshot({ timeout: 120_000, animations: "disabled" });
    if (problems.length) {
      throw new Error(`the page threw while being photographed: ${problems[0]}`);
    }
    return png;
  } finally {
    await page.close();
  }
}

// ---- Run --------------------------------------------------------------------

const exists = (p) => access(p).then(() => true, () => false);
const publicDir = join(siteDir, "apps", "web", "public", "shots");
const dataDir = join(siteDir, "apps", "web", "src", "data");
const haveSite = () => exists(join(siteDir, "apps", "web"));
const noSite = () =>
  console.log(
    `site    skipped — no checkout at ${siteDir}\n` +
      `        (pass --site <dir>; the archive is complete either way)`,
  );

if (manifestOnly) {
  if (!(await haveSite())) {
    noSite();
  } else {
    await mkdir(dataDir, { recursive: true });
    await writeFile(join(dataDir, "shots.ts"), manifest());
    console.log(`manifest → ${join(dataDir, "shots.ts")} (no images re-rendered)`);
  }
  process.exit(0);
}

const app = await serve(join(ROOT, "dist"), 5210, { spa: true });
const browser = await launch();
const results = [];

try {
  // One page for encoding, reused. Spinning up a browser context per re-encode
  // costs more than the encode does.
  const codec = await browser.newPage();
  await codec.goto("about:blank");

  const archiveDir = join(archiveRoot, `${today}-${commit}${dirty ? "-dirty" : ""}`);
  if (!preview) await mkdir(archiveDir, { recursive: true });

  for (const shot of wanted) {
    for (const variant of VARIANTS) {
      const stem = `${shot.id}-${variant}`;
      const png = await shoot(browser, shot, shot[variant]);
      if (preview) {
        await mkdir(join(ROOT, "shots", "preview"), { recursive: true });
        await writeFile(join(ROOT, "shots", "preview", `${stem}.png`), png);
        console.log("preview", stem);
        continue;
      }

      await writeFile(
        join(archiveDir, `${stem}.webp`),
        await encode(codec, png, VIEWPORT.width * 2, ARCHIVE_QUALITY),
      );

      const sizes = {};
      for (const size of SIZES) {
        sizes[size.suffix] = await encode(codec, png, size.width, size.quality);
      }
      results.push({ stem, sizes });
      console.log(
        "shot   ",
        stem.padEnd(22),
        SIZES.map((s) => `${s.suffix}w ${Math.round(sizes[s.suffix].length / 1024)}kB`).join("  "),
      );
    }
  }

  if (preview) {
    console.log(`\npreviews in ${join(ROOT, "shots", "preview")}`);
  } else {
    console.log(`\narchive ${archiveDir}`);

    if (!(await haveSite())) {
      noSite();
    } else {
      await mkdir(publicDir, { recursive: true });
      await mkdir(dataDir, { recursive: true });
      for (const { stem, sizes } of results) {
        for (const size of SIZES) {
          await writeFile(join(publicDir, `${stem}-${size.suffix}.webp`), sizes[size.suffix]);
        }
      }
      // Regenerating the manifest from a partial run would drop every shot the
      // run did not take, so `--only` writes images and leaves the manifest be.
      if (only) {
        console.log(`site    ${results.length} frames → ${publicDir}`);
        console.log("        manifest left alone (partial run; re-run without --only to rewrite it)");
      } else {
        await writeFile(join(dataDir, "shots.ts"), manifest());
        console.log(`site    ${results.length} frames → ${publicDir}`);
        console.log(`        manifest → ${join(dataDir, "shots.ts")}`);
      }
    }
  }
} finally {
  await browser.close();
  app.close();
}

// ---- The generated manifest -------------------------------------------------

function manifest() {
  const aspect = VIEWPORT.width / VIEWPORT.height;
  const frame = (id, variant) => {
    const f = SHOTS.find((s) => s.id === id)[variant];
    return `{
      at: ${JSON.stringify(f.at)},
      src: ${JSON.stringify(`/shots/${id}-${variant}-1600.webp`)},
      srcSmall: ${JSON.stringify(`/shots/${id}-${variant}-800.webp`)},
      alt: ${JSON.stringify(f.alt)},
      note: ${JSON.stringify(f.note)},
    }`;
  };
  const entries = SHOTS.map(
    (s) => `  {
    id: ${JSON.stringify(s.id)},
    door: ${JSON.stringify(s.door)},
    place: ${JSON.stringify(s.place)},
    width: ${SIZES[0].width},
    height: ${Math.round(SIZES[0].width / aspect)},
    caption: ${JSON.stringify(s.caption)},
    day: ${frame(s.id, "day")},
    night: ${frame(s.id, "night")},
  },`,
  ).join("\n");

  return `/**
 * Generated. Do not edit — \`scripts/brand-assets/shots.mjs\` in the tera repo
 * rewrites this file wholesale, and the captions below live next to the camera
 * poses that framed them so the two cannot drift apart.
 *
 * To change a picture or its caption: edit \`SHOTS\` in that script, run
 * \`node scripts/brand-assets/shots.mjs\`, and commit both repos. A caption-only
 * change can use \`--manifest-only\` and skip the render entirely.
 *
 * Every image is a screenshot of tera's built \`dist/\` at the commit named
 * below. Nothing here is an illustration.
 */

/**
 * A union rather than \`string\`, so a page asking for a picture that is not in
 * this list fails \`npm run typecheck\` — which the pre-push hook runs — instead
 * of rendering a hole a reader finds later.
 */
export type ShotId =
${SHOTS.map((s) => `  | ${JSON.stringify(s.id)}`).join("\n")};

/** One camera, one clock. Every shot has two of these and differs only in the hour. */
export interface Frame {
  /** The instant the engine's own clock was set to. The sun follows from it. */
  at: string;
  src: string;
  srcSmall: string;
  alt: string;
  /** What this hour in particular is showing, appended to the shot's caption. */
  note: string;
}

export interface Shot {
  id: ShotId;
  /** Which door the engine was showing: the city, or an office interior. */
  door: "tera" | "office";
  /** Where this is, in words a reader would use. */
  place: string;
  width: number;
  height: number;
  /** True of both frames — the place and the mechanism, never the light. */
  caption: string;
  day: Frame;
  night: Frame;
}

/** The tera commit these were rendered from. */
export const SHOTS_COMMIT = ${JSON.stringify(commit)};
/** True if that commit is not the whole story — the tree had uncommitted work. */
export const SHOTS_DIRTY = ${dirty};
/** The day the shutter opened, ISO. */
export const SHOTS_CAPTURED = ${JSON.stringify(today)};

export const SHOTS: Shot[] = [
${entries}
];

/** Total, because \`ShotId\` cannot name a shot that is not in \`SHOTS\`. */
export const byId = (id: ShotId): Shot => SHOTS.find((s) => s.id === id)!;
`;
}