#include <curl/curl.h>
#include <nlohmann/json.hpp>

#include <iostream>
#include <string>

// A whole number with a comma every three digits
static std::string grouped(long long n) {
    std::string s = std::to_string(n);
    for (int i = static_cast<int>(s.size()) - 3; i > 0; i -= 3) {
        s.insert(static_cast<size_t>(i), ",");
    }
    return s;
}

// libcurl hands the body over in pieces: append each one to a string
static size_t append(char* data, size_t size, size_t n, void* body) {
    static_cast<std::string*>(body)->append(data, size * n);
    return size * n;
}

int main() {
    // Read NVDA's file (one GET, no key), naming your own project
    std::string body;
    CURL* curl = curl_easy_init();
    curl_easy_setopt(curl, CURLOPT_URL,
                     "https://tickerinside.com/api/v1/sec/nvda.json");
    curl_easy_setopt(curl, CURLOPT_USERAGENT,
                     "MyProject/1.0 (+https://example.com)");
    curl_easy_setopt(curl, CURLOPT_FAILONERROR, 1L);
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, append);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &body);
    CURLcode rc = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
    if (rc != CURLE_OK) {
        std::cerr << curl_easy_strerror(rc) << "\n";
        return 1;
    }
    // The etf_ownership block holds the figure
    auto own = nlohmann::json::parse(body)["etf_ownership"];

    // pct_lower_bound is null when no figure is published, and refused says
    // why
    if (own["pct_lower_bound"].is_null()) {
        std::cout << "NVDA etf_ownership: no figure published, refused "
                  << own["refused"].get<std::string>() << "\n";
        return 0;
    }
    std::cout << "NVDA etf_ownership: at least "
              << own["pct_lower_bound"].get<double>()
              << "% of its shares held by covered US ETFs, basis "
              << own["basis"].get<std::string>() << "\n";
    // The shares counted, and the date of the count of shares outstanding
    std::cout << "shares_held " << grouped(own["shares_held"].get<long long>())
              << " shares_outstanding "
              << grouped(own["shares_outstanding"].get<long long>())
              << " as of "
              << own["shares_outstanding_as_of"].get<std::string>() << "\n";
    // The oldest and the newest holdings file behind the figure
    auto& dates = own["holdings_dates"];
    std::cout << "holdings dated " << dates["oldest"].get<std::string>()
              << " to " << dates["newest"].get<std::string>() << "\n";
    // The line to print under the figure
    std::cout << own["cite_as"].get<std::string>() << "\n";
}