import { test } from "node:test";
import assert from "node:assert/strict";
import { createHash } from "node:crypto";
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { WORDMARK_METRICS } from "./wordmarkMetrics";
import { wordmarkWidthEm } from "./wordmarkWidth";

// Run with: pnpm --filter yt-dlp-transcript-common test

const FONT = path.resolve(
  path.dirname(fileURLToPath(import.meta.url)),
  "..",
  "..",
  "umtool",
  "report-to-video",
  "fonts",
  WORDMARK_METRICS.font,
);

test("the table was generated from the vendored Archivo", () => {
  const sha = createHash("sha256").update(fs.readFileSync(FONT)).digest("hex");
  assert.equal(WORDMARK_METRICS.sha256, sha, "re-run common/bin/gen-wordmark-metrics.py");
  const size = WORDMARK_METRICS.ranges.reduce((n, [a, b]) => n + b - a + 1, 0);
  assert.equal(WORDMARK_METRICS.advances[720].length, size);
  assert.equal(WORDMARK_METRICS.advances[380].length, size);
});

test("the lead is set heavier, so wider, than the same letters as suffix", () => {
  const heavy = wordmarkWidthEm("Wwww", "Wwww");
  const light = wordmarkWidthEm("xWwww", "x") - wordmarkWidthEm("x", "x");
  assert.ok(heavy > light, `${heavy} vs ${light}`);
});

test("longer titles are wider; tracking narrows by its value per character", () => {
  assert.ok(wordmarkWidthEm("Rekietalyzer", "Rekieta") > wordmarkWidthEm("Jeralyzer", "Jer"));
  const plain = wordmarkWidthEm("Archilyzer", "Archi");
  const tracked = wordmarkWidthEm("Archilyzer", "Archi", -0.01);
  assert.ok(Math.abs(plain - tracked - 0.1 * 1.03) < 0.002, `${plain} → ${tracked}`);
});

test("a character the table does not hold counts wide, not zero", () => {
  const latin = wordmarkWidthEm("Ab", "Ab");
  assert.ok(wordmarkWidthEm("Ab中", "Ab") - latin > 1.2);
});