#include <iostream>
#include <sstream>
#include <vector>
#include <curl/curl.h>
#include "histogram.h"
#include "svg.h"
#include "text.h"

using namespace std;

struct Input {
    vector<double> numbers;
    size_t bin_count{};
};

Input input_data(istream& in, bool prompt = false) {
    Input in_data;
    size_t number_count;
    if (prompt) cerr << "Enter number count: ";
    in >> number_count;
    in_data.numbers.resize(number_count);
    if (prompt && number_count > 0) cerr << "Enter numbers: ";
    for (size_t i = 0; i < number_count; i++) {
        in >> in_data.numbers[i];
    }
    if (prompt) cerr << "Enter bin count: ";
    in >> in_data.bin_count;
    return in_data;
}

// Колбэк-функция для cURL: записывает данные в буфер
size_t write_data(void* ptr, size_t size, size_t nmemb, void* userdata) {
    size_t total = size * nmemb;
    stringstream* stream = reinterpret_cast<stringstream*>(userdata);
    stream->write(reinterpret_cast<const char*>(ptr), total);
    return total;
}

Input download(const string& url) {
    CURL* curl = curl_easy_init();
    if (!curl) {
        cerr << "Failed to init curl" << endl;
        exit(1);
    }

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

    CURLcode res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);

    if (res != CURLE_OK) {
        cerr << "cURL error: " << curl_easy_strerror(res) << endl;
        exit(1);
    }

    return input_data(buffer, false);
}

int main(int argc, char* argv[]) {
    curl_global_init(CURL_GLOBAL_ALL);

    Input input;
    if (argc > 1) {
        input = download(argv[1]);
    } else {
        input = input_data(cin, true);
    }

    auto bins = make_histogram(input.numbers, input.bin_count);
    show_histogram_svg(bins);

    curl_global_cleanup();
    return 0;
}