/**
 * Patch TradingView charting_library Asia/Tehran zone:
 * Iran abolished DST in 2022 — permanently UTC+03:30 (12600s).
 *
 * IMPORTANT: TV binary-search returns -1 (→ offset 0 / UTC) when "now"
 * is past the LAST transition. A single-entry zone breaks modern charts.
 * Mirror Asia/Dubai: keep a far-future sentinel as the last time entry.
 */
const fs = require("fs");
const path = require("path");

// Both offsets 12600: permanent UTC+03:30 (no DST).
// Sentinel ~2030 so current timestamps resolve to index 0/1 with +3:30, not UTC.
const FIXED =
  '"Asia/Tehran":{time:[-1704153600,1925006400],offset:[12600,12600]}';

const FILES = [
  path.resolve(
    __dirname,
    "../../Gereh/src/charting_library/static/bundles/library.e964cdc99937c68d0389.js"
  ),
  path.resolve(
    __dirname,
    "../../Gereh/public/charting_library/static/bundles/library.e964cdc99937c68d0389.js"
  ),
  path.resolve(
    __dirname,
    "../../Shahoo/public/charting_library/static/bundles/library.e964cdc99937c68d0389.js"
  ),
  path.resolve(
    __dirname,
    "../../Shahoo/src/features/Market/MainComponents/TVChartContainer/charting_library/static/bundles/library.e964cdc99937c68d0389.js"
  ),
];

function extractTehran(s) {
  const key = '"Asia/Tehran":{';
  const i = s.indexOf(key);
  if (i < 0) return null;
  let depth = 0;
  let end = -1;
  for (let j = i + key.length - 1; j < s.length; j++) {
    if (s[j] === "{") depth++;
    else if (s[j] === "}") {
      depth--;
      if (depth === 0) {
        end = j + 1;
        break;
      }
    }
  }
  if (end < 0) return null;
  return { start: i, end, text: s.slice(i, end) };
}

let patched = 0;
for (const file of FILES) {
  if (!fs.existsSync(file)) {
    console.log("skip missing:", file);
    continue;
  }
  const src = fs.readFileSync(file, "utf8");
  const hit = extractTehran(src);
  if (!hit) {
    console.log("skip no Tehran:", file);
    continue;
  }
  if (hit.text === FIXED) {
    console.log("already patched:", file);
    continue;
  }
  fs.writeFileSync(file, src.slice(0, hit.start) + FIXED + src.slice(hit.end));
  console.log("patched:", path.relative(process.cwd(), file));
  console.log("  was:", hit.text);
  console.log("  now:", FIXED);
  patched++;
}

console.log("done, patched", patched, "file(s)");