import assert from "assert";
import BN from "bn.js";
import fetch from 'node-fetch';

assert(process.env.NEXT_PUBLIC_USDC_MINT, 'USDC_MINT is required');
assert(process.env.NEXT_PUBLIC_MTM_TOKEN_MINT, 'MTM_TOKEN_MINT is required');

const MTM_TOKEN_MINT = process.env.NEXT_PUBLIC_MTM_TOKEN_MINT;
const USDC_MINT = process.env.NEXT_PUBLIC_USDC_MINT;

class QuotesService {
  private cachedQuotes: BN[] = [];

  async fetchAndCacheQuotes(): Promise<void> {
    try {
      const url = `https://api.jup.ag/price/v2?ids=${USDC_MINT}&vsToken=${MTM_TOKEN_MINT}`;
      const response = await fetch(url);

      if (!response.ok) {
        throw new Error(`Failed to fetch quote: ${response.statusText}`);
      }

      const quoteResponse = await response.json();
      const priceFromAPI = Number(quoteResponse['data'][USDC_MINT]['price']).toFixed(6);
      const price = new BN(priceFromAPI.toString().replace('.', ''));

      this.cachedQuotes.push(price);
      if (this.cachedQuotes.length > 3) {
        this.cachedQuotes.shift();
      }
      console.log('Cache updated: ', this.cachedQuotes);
    } catch (error) {
      console.error('Error fetching quotes:', error);
    }
  }

  getLatestQuote(): BN | undefined {
    console.log({ cachedQuotes: this.cachedQuotes });
    return this.cachedQuotes[this.cachedQuotes.length - 1];
  }
}

export { QuotesService };