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

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

static int progress_callback(void* clientp, double dltotal, double dlnow, double ultotal, double ulnow) {
    if (dltotal <= 0) return 0;

    int progress = static_cast<int>((dlnow / dltotal) * 100);
    cerr << "Progress: " << progress << "%\r";
    cerr.flush();
    return 0;
}

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

    if (prompt) {
            cerr << "Enter bin count: ";
    }
    in >> inp.bin_count;
    return inp;
}

size_t write_data(void* items, size_t item_size, size_t item_count, void* ctx) {
    stringstream* buffer = reinterpret_cast<stringstream*>(ctx);
    size_t data_size = item_size * item_count;
    (*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);
        curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 0L);
        curl_easy_setopt(curl, CURLOPT_PROGRESSFUNCTION, progress_callback);

        res = curl_easy_perform(curl);
        if (res != CURLE_OK){
            cerr << curl_easy_strerror(res);
            exit(1);
        }
        curl_easy_cleanup(curl);
        cerr << endl;
    }

    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);
    }

    auto bins = make_histogram(input.numbers, input.bin_count);
    show_histogram_svg(bins);
    return 0;
}