import { setupCache, serializeQuery } from 'axios-cache-adapter';

const cache = new LRU(/*...*/);

export default function({ $axios, store, isDev }) {
  // https://github.com/RasCarlito/axios-cache-adapter/blob/98415a2d872954562c36df31a96b64427bbb2e4f/src/memory.js
  class LruStore {
    constructor() {
      this.state = cache;
    }

    getItem(key) {
      const item = this.state.get(key) || null;
      return item;
    }

    setItem(key, value) {
      if (!value.expires) return;
      return this.state.set(key, value.data, value.expires - Date.now());
    }

    removeItem(key) {
      return this.state.del(key);
    }

    clear() {
      this.state.reset();
    }

    length() {
      return _.size(this.state);
    }

    iterate(fn) {
      return this.state.forEach(fn);
    }
  }

  let axiosCache = setupCache({
    store: new LruStore(),
    readHeaders: true,
    key: req => req.url + (_.last(req.url) == '/' ? '' : '/') + serializeQuery(req),
    exclude: {
      query: false, // не игнорируем query в запросе
      filter(req) {
        return false; // по умолчанию всё пишем в кэш
      },
    },
  });

  const defaults = $axios.defaults;
  defaults.adapter = axiosCache.adapter;
}