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

using namespace std;

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

Input input_data(istream& stream, bool prompt) {
  Input in;
  size_t number_count;
  if (prompt) {
    cerr << "Enter number count: ";
  }
  stream >> number_count;
  in.numbers.resize(number_count);
  for (size_t i = 0; i < number_count; i++) {
    if (prompt) {
      cerr << "Enter number " << i+1 << ": ";
    }
    stream >> in.numbers[i];
  }
  if (prompt) {
    cerr << "Enter bin count: ";
  }
  stream >> in.bin_count;
  return in;
}

size_t
write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
    size_t data_size = item_size * item_count;
    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
    (*buffer).write(reinterpret_cast<const char*>(items), data_size);
    return data_size;
}

Input download(const string& address) {
    stringstream buffer;
    CURL *curl = curl_easy_init();
    if(curl) {
        CURLcode res;
        curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
        curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
        curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
        res = curl_easy_perform(curl);
        if (res != CURLE_OK){
	    double total_time;
            if (!curl_easy_getinfo(curl, CURLINFO_TOTAL_TIME, &total_time)){;
              cerr << "Total time for download: " << total_time << " seconds." << "CURL error: " << curl_easy_strerror(res) << endl;
             } else {
                 cerr << "CURL error: " << curl_easy_strerror(res) << endl;
             }
            exit(1);
        }
        curl_easy_cleanup(curl);
    }
    return input_data(buffer, false);
}

int main(int argc, char* argv[]) {
    Input input;
     if (argc > 1) {
        input = download(argv[1]);
    } else {
        input = input_data(cin, true);
    }
    const auto bins = make_histogram(input.numbers, input.bin_count);
    show_histogram_svg(bins);
}