import ky from "ky";
import logger from "../utils/logger.js"

// Global object to store the latest crypto prices
const cryptoPrices = {
    btc: null,
    ltc: null,
    xmr: null,
    lastUpdated: null,
};

/**
 * Fetch crypto prices from the CoinGecko API and update the global `cryptoPrices` object.
 */
const fetchCryptoPrices = async () => {
    try {
        const url =
            "https://api.coingecko.com/api/v3/simple/price?ids=bitcoin,litecoin,monero&vs_currencies=gbp";

        // Fetch using Ky with automatic JSON parsing
        const data = await ky.get(url).json();

        // Update the stored crypto prices
        cryptoPrices.btc = data.bitcoin?.gbp ?? null;
        cryptoPrices.ltc = data.litecoin?.gbp ?? null;
        cryptoPrices.xmr = data.monero?.gbp ?? null;
        cryptoPrices.lastUpdated = new Date().toISOString();

        logger.info("✅ Crypto prices updated", { cryptoPrices });
    } catch (error) {
        logger.error("❌ Error fetching crypto prices", {
            message: error.message || "Unknown error",
        });
    }
};

/**
 * Starts the automatic crypto price updater.
 * @param {number} interval - Update interval in seconds.
 */
const startCryptoPriceUpdater = (interval) => {
    logger.info(`🚀 Starting crypto price updater (every ${interval} seconds)`);
    fetchCryptoPrices(); // Fetch immediately
    setInterval(fetchCryptoPrices, interval * 1000); // Fetch periodically
};

/**
 * API Route: Get the latest crypto prices.
 * @route GET /api/crypto
 */
const getCryptoPrices = async (req, res) => {
    try {
        res.json({
            success: true,
            prices: cryptoPrices,
        });
    } catch (error) {
        logger.error("❌ Error getting crypto prices", {
            message: error.message || "Unknown error",
        });
        res.status(500).json({ success: false, error: "Internal Server Error" });
    }
};

const returnCryptoPrices = () => {
    return cryptoPrices;
};

export { startCryptoPriceUpdater, getCryptoPrices, returnCryptoPrices };