declaration.hpp

namespace FMP
{
    enum CACHE_LENGTH { SHORT, LONG };
    struct FMPCloudAPI
    {
        FMPCloudAPI(std::string apiKey) : _apiKey(apiKey) 
        {
            /* TODO: Init cache expiration timers */
        }

        // ----------------- Endpoints -------------------
        Document getStockQuote(const std::string& symbol) const;                // no cache
        Document getStockQuote(const std::vector<std::string>& symbols) const;  // no cache
        Document getAvailableCrypto();                                          // long cache
        Document getCryptoPrices() const;                                       // no cache
        Document getAvailableForex();                                           // long cache
        Document getAllForexPrices() const;                                     // no cache
        Document getAllForexTick() const;                                       // no cache

        // ----------------- Helper Functions ---------------
        // on construction, create a timer to periodically expire the caches
        // ideally, there would be 2 or 3 caches, short, medium, and long or short and long, 
        // which are all expired at different intervals.
        void expireCache() { _expireLongCache(); };
        void printDocument(const Document& jsonDoc, std::ostream& stream) const;
        private:
            std::string _apiKey;
            std::string _baseUrl {"https://fmpcloud.io/api/"};
            std::map<std::string, std::string> _longJsonContentsCache; 

            std::string _toCommaDelimited(const std::vector<std::string>& stringVector) const;
            std::string _downloadAndGetJsonFile(const std::string& url, const std::string& filename) const;    // download data, return as string
            std::string _generateFilename(const std::string& endpoint) const;
            Document _return(const std::string& contents) const;
            Document _returnFromAndUpdateCache(std::string url, std::string cacheKey, std::string filenameKey, CACHE_LENGTH duration);
            Document _getNoCache(std::string url, std::string filenameKey) const;

            std::string _getCachedContents(std::string key, CACHE_LENGTH length) const;
            void _cache(std::string key, std::string results, CACHE_LENGTH length);
            void _expireLongCache() { _longJsonContentsCache.clear(); }
    };
}