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Website : rimsha.abasa.com
: / var / www / mudeerapi.abasa.com / nodetest-backup30April26 / src / services /
Filename : currencyService.js
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import axios from 'axios';

const CACHE_TTL_MS = 24 * 60 * 60 * 1000; // 24 hours
const cache = new Map(); // key: currencyCode (lowercase) -> { rateToUsd, fetchedAt }

function getCached(currencyCode) {
  const key = (currencyCode || '').toLowerCase();
  const entry = cache.get(key);
  if (!entry) return null;
  if (Date.now() - entry.fetchedAt > CACHE_TTL_MS) {
    cache.delete(key);
    return null;
  }
  return entry;
}

function setCached(currencyCode, rateToUsd, fetchedAt = Date.now()) {
  const key = (currencyCode || '').toLowerCase();
  cache.set(key, { rateToUsd, fetchedAt });
}

const PRIMARY_BASE = 'https://cdn.jsdelivr.net/npm/@fawazahmed0/currency-api@latest/v1/currencies';
const FALLBACK_BASE = 'https://latest.currency-api.pages.dev/v1/currencies';

export async function fetchRateToUsd(baseCurrency) {
  if (!baseCurrency || typeof baseCurrency !== 'string') {
    throw new Error('baseCurrency is required');
  }
  const code = baseCurrency.trim().toLowerCase();
  if (code === 'usd') return { rateToUsd: 1, fetchedAt: Date.now(), raw: { usd: 1 } };

  const cached = getCached(code);
  if (cached != null) {
    return {
      rateToUsd: cached.rateToUsd,
      fetchedAt: cached.fetchedAt,
      raw: { [code]: { usd: cached.rateToUsd } },
    };
  }

  const urlPrimary = `${PRIMARY_BASE}/${code}.min.json`;
  const urlFallback = `${FALLBACK_BASE}/${code}.min.json`;

  let data;
  try {
    const res = await axios.get(urlPrimary, { timeout: 10000 });
    data = res.data;
  } catch (err) {
    try {
      const res = await axios.get(urlFallback, { timeout: 10000 });
      data = res.data;
    } catch (err2) {
      throw new Error(`Currency API failed for ${baseCurrency}: ${err.message}`);
    }
  }

  const rates = data[code];
  if (!rates || typeof rates.usd !== 'number') {
    throw new Error(`No USD rate found for ${baseCurrency}`);
  }
  const rateToUsd = rates.usd;
  const fetchedAt = Date.now();
  setCached(code, rateToUsd, fetchedAt);
  return { rateToUsd, fetchedAt, raw: data };
}

export async function convertToUsd(amount, baseCurrency) {
  if (baseCurrency && (baseCurrency.trim().toUpperCase() === 'USD')) {
    return { amountUsd: Number(amount), rate: 1, fetchedAt: Date.now() };
  }
  const { rateToUsd, fetchedAt } = await fetchRateToUsd(baseCurrency || 'USD');
  // rateToUsd = USD per 1 unit of base currency (e.g. 1 PKR = 0.00358 USD)
  const amountUsd = Number(amount) * rateToUsd;
  return { amountUsd, rate: rateToUsd, fetchedAt };
}