import { createReadStream } from "node:fs";
import { createInterface } from "node:readline";
import { fileURLToPath } from "node:url";
import path from "node:path";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const filePath = path.join(__dirname, "..", "assets", "tv-ideas.original.jsonl");

const rl = createInterface({
  input: createReadStream(filePath, "utf8"),
  crlfDelay: Infinity,
});

/** @type {Map<string, number>} symbol -> count */
const counts = new Map();
let total = 0;
let parseErrors = 0;

for await (const line of rl) {
  const trimmed = line.trim();
  if (!trimmed) continue;
  let doc;
  try {
    doc = JSON.parse(trimmed);
  } catch {
    parseErrors++;
    continue;
  }
  total++;
  const symbol = doc.symbol;
  counts.set(symbol, (counts.get(symbol) ?? 0) + 1);
}

// Множество (Set) уникальных символов
const symbolSet = new Set(counts.keys());

// Сортируем по частоте (убывание), затем по имени
const sorted = [...counts.entries()].sort(
  (a, b) => b[1] - a[1] || String(a[0]).localeCompare(String(b[0]))
);

console.log(`Всего документов:      ${total}`);
console.log(`Ошибок парсинга:       ${parseErrors}`);
console.log(`Уникальных символов:   ${symbolSet.size}`);
console.log("");
console.log("Символ                Кол-во");
console.log("----------------------------");
for (const [symbol, count] of sorted) {
  console.log(`${String(symbol).padEnd(20)}  ${count}`);
}