const memoryBackend = require("./backend/pricing/memory.js");

const globalCache = {};
let globalInstance;

function global({ seed = {}, backend = memoryBackend } = {}) {
    if (!globalInstance) {
        Object.assign(globalCache, seed, { USD: 1 });
        globalInstance = backend(globalCache);
    }
    return globalInstance;
}

function instance({ cache = {}, backend = memoryBackend } = {}) {
    return backend(Object.assign(cache, { USD: 1 }));
}
module.exports = {
    global,
    instance,
};