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

        int speed;
        curl_easy_getinfo(curl,CURLINFO_SPEED_DOWNLOAD_T, & speed);
        cerr << "The average download speed: " << speed <<  " bytes/second" << endl ;


        if (res!=CURLE_OK){
            cerr << curl_easy_strerror(res);
            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);
     return 0;
}