/**
 * ponytail: assert Tehran display formatting (fixed +03:30).
 * Run: node scripts/check-format-display-datetime.js
 *
 * Standalone copy of offset math — CRA ESM can't require() the helper.
 * Keep in sync with src/core/helper/formatDisplayDateTime.js
 */
const assert = require("assert");

const TEHRAN_UTC_OFFSET_MINUTES = 210;

function formatTehranFromUnixSec(unixSec, pattern) {
  // 2024-01-15T12:00:00Z → Tehran 15:30
  const ms = unixSec * 1000 + TEHRAN_UTC_OFFSET_MINUTES * 60 * 1000;
  const d = new Date(ms);
  const hh = String(d.getUTCHours()).padStart(2, "0");
  const mm = String(d.getUTCMinutes()).padStart(2, "0");
  const ss = String(d.getUTCSeconds()).padStart(2, "0");
  if (pattern === "time") return `${Number(hh)}:${mm}:${ss}`.replace(/^0/, "") || `${hh}:${mm}:${ss}`;
  // Just assert hour/minute components for smoke
  return { hour: d.getUTCHours(), minute: d.getUTCMinutes() };
}

// 1705320000 = 2024-01-15T12:00:00.000Z → Tehran 15:30
const parts = formatTehranFromUnixSec(1705320000, "full");
assert.strictEqual(parts.hour, 15, "Tehran hour for 12:00Z");
assert.strictEqual(parts.minute, 30, "Tehran minute for 12:00Z");
assert.strictEqual(TEHRAN_UTC_OFFSET_MINUTES, 210);

console.log("check-format-display-datetime: ok");