#define CURL_STATICLIB // Для статической линковки
#include <curl/curl.h>
#include <sstream>

#include "histogram.h"


#include <iostream>


static size_t WriteCallback(void* contents, size_t size, size_t nmemb, void* userp) {
    size_t real_size = size * nmemb;
    std::stringstream* buffer = static_cast<std::stringstream*>(userp);
    buffer->write(static_cast<const char*>(contents), real_size);
    return real_size;
}

Input download(const std::string& url) {
    CURL* curl = curl_easy_init();
    std::stringstream buffer;

    if(!curl) {
        std::cerr << "Ошибка: не удалось инициализировать cURL" << std::endl;
        exit(EXIT_FAILURE);
    }


    curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteCallback);
    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);

    CURLcode res = curl_easy_perform(curl);

    if(res != CURLE_OK) {
        std::cerr << "Ошибка cURL (" << res << "): "
                  << curl_easy_strerror(res) << std::endl;

        const char* url_info;
        if(curl_easy_getinfo(curl, CURLINFO_EFFECTIVE_URL, &url_info) == CURLE_OK) {
            std::cerr << "URL: " << url_info << std::endl;
        }

        curl_easy_cleanup(curl);
        exit(EXIT_FAILURE);
    }

    if(buffer.str().empty()) {
        std::cerr << "Ошибка: получен пустой ответ от сервера" << std::endl;
        curl_easy_cleanup(curl);
        exit(EXIT_FAILURE);
    }

    curl_easy_cleanup(curl);
    return input_data(buffer, false);
}