const assert = require("node:assert/strict");

// This is an adversarial executable check for the OpenAPI text contract only.
// It is not the production G12 normalizer or coordinator.
const boundaryAndControlPattern = /^(?!.*[\u0000-\u001F\u007F-\u009F\u061C\u200B-\u200F\u2028-\u202E\u2060\u2066-\u2069\uFEFF])\S(?:[\s\S]*\S)?$/u;

function hasWellFormedUtf16(value) {
  for (let index = 0; index < value.length; index += 1) {
    const unit = value.charCodeAt(index);
    if (unit >= 0xd800 && unit <= 0xdbff) {
      const next = value.charCodeAt(index + 1);
      if (!(next >= 0xdc00 && next <= 0xdfff)) return false;
      index += 1;
      continue;
    }
    if (unit >= 0xdc00 && unit <= 0xdfff) return false;
  }
  return true;
}

function validatesDeclaredGenerationText(value) {
  return (
    typeof value === "string" &&
    hasWellFormedUtf16(value) &&
    value === value.normalize("NFC") &&
    [...value].length >= 1 &&
    [...value].length <= 50 &&
    boundaryAndControlPattern.test(value)
  );
}

const hanDe = "\u5FB7";
const hanCheng = "\u627F";
const supplementary = String.fromCodePoint(0x20000);

for (const valid of [
  `${hanDe}${hanCheng}`,
  `${hanDe}${hanDe}`,
  `${supplementary}${hanCheng}`,
  supplementary.repeat(50),
]) {
  assert.equal(validatesDeclaredGenerationText(valid), true, `valid sample rejected: ${JSON.stringify(valid)}`);
}

for (const invalid of [
  "",
  supplementary.repeat(51),
  "e\u0301",
  "\ud800",
  "\udc00",
  ` ${hanDe}`,
  `${hanDe} `,
  `\u00A0${hanDe}`,
  `${hanDe}\u00A0`,
  `${hanDe}\t${hanCheng}`,
  `${hanDe}\r${hanCheng}`,
  `${hanDe}\n${hanCheng}`,
  `${hanDe}\u0085${hanCheng}`,
  `${hanDe}\u061C${hanCheng}`,
  `${hanDe}\u200B${hanCheng}`,
  `${hanDe}\u200E${hanCheng}`,
  `${hanDe}\u200F${hanCheng}`,
  `${hanDe}\u2028${hanCheng}`,
  `${hanDe}\u2029${hanCheng}`,
  `${hanDe}\u202E${hanCheng}`,
  `${hanDe}\u2060${hanCheng}`,
  `${hanDe}\u2066${hanCheng}`,
  `${hanDe}\uFEFF${hanCheng}`,
]) {
  assert.equal(validatesDeclaredGenerationText(invalid), false, `invalid sample accepted: ${JSON.stringify(invalid)}`);
}

console.log("G12-GENERATION-POEM-UNICODE-RUNTIME-SMOKE PASS");