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

#include <algorithm>
#include <iostream>
#include <string>
#include <utility>
#include <vector>

// 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 VOO'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/fund/voo.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;
    }
    auto fund = nlohmann::json::parse(body);

    // The date of the issuer's file the weights come from
    std::cout << "VOO holdings_as_of "
              << fund["holdings_as_of"].get<std::string>() << "\n";

    // holdings maps each ticker to its weight in percent: largest first
    std::vector<std::pair<std::string, double>> rows;
    for (auto& [ticker, weight] : fund["holdings"].items()) {
        rows.emplace_back(ticker, weight.get<double>());
    }
    std::stable_sort(rows.begin(), rows.end(),
                     [](const auto& a, const auto& b) {
                         return a.second > b.second;
                     });
    std::cout << rows.size() << " holdings, largest first\n";
    for (auto& [ticker, weight] : rows) {
        std::cout << ticker << " " << weight << "\n";
    }

    // The line to print under any figure you quote
    std::cout << fund["cite_as"].get<std::string>() << "\n";
}