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

using namespace std;

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

Input
input_data(istream& in, bool prompt) {
    Input local;

    size_t number_count;
    size_t bin_count;

    if (prompt) {
        cerr << "Enter number count: ";
    }
    in >> local.number_count;
    if (prompt) {
        cerr << "Enter bin count: ";
    }
    in >> local.bin_count;

    local.numbers.resize(local.number_count);

    for (size_t i = 0; i < local.number_count; i++) {
        in >> local.numbers[i];
    }

    return local;
};

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) {
            cerr << curl_easy_strerror(res);
            exit(1);
        }

        curl_easy_cleanup(curl);
    }

    return input_data(buffer, false);
}

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

    std::string fill = "red";
    std::string stroke = "#000000";

    curl_global_init(CURL_GLOBAL_ALL);

    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, fill, stroke);
    return 0;
}