#include <math.h>
#include <iostream>
#include <conio.h>
#include <vector>
#include <string>
#include "svg.h"

using namespace std;

void
svg_begin(double width, double height)
{
    cout << "<?xml version='1.0' encoding='UTF-8'?>\n";
    cout << "<svg ";
    cout << "width='" << width << "' ";
    cout << "height='" << height << "' ";
    cout << "viewBox='0 0 " << width << " " << height << "' ";
    cout << "xmlns='http://www.w3.org/2000/svg'>\n";
}


void
svg_end()
{
    cout << "</svg>\n";
}


void
svg_text(double left, double baseline, string text)
{
    cout << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>";
}

void
svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "red")
{
    cout << "<rect x='"<<x<<"' y='"<<y<<"' width='"<<width<<"' height='"<<height<<"' stroke='"<<stroke<<"' fill='"<<fill<<"' />";

}

void
show_histogram_svg(const vector<size_t>& bins) {
    //
    const auto IMAGE_WIDTH = 400;
    const auto IMAGE_HEIGHT = 300;
    const auto TEXT_LEFT = 20;
    const auto TEXT_BASELINE = 20;
    const auto TEXT_WIDTH = 50;
    const auto BIN_HEIGHT = 30;
    const auto BLOCK_WIDTH = 10;

    const auto MAX_WIDTH = IMAGE_WIDTH - TEXT_WIDTH;

    size_t max_bin = 0;
    for (size_t bin : bins) {
        if (bin > max_bin) {
            max_bin = bin;
        }
    }
    //
    svg_begin(400, 300);
    double top = 0;
    for (size_t bin : bins) {

        double bin_width = 0;
        bin_width = (MAX_WIDTH * bin) / max_bin;

        svg_text(IMAGE_WIDTH - TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
        svg_rect(IMAGE_WIDTH - TEXT_WIDTH - bin_width, top, bin_width, BIN_HEIGHT);
        top += BIN_HEIGHT;
    }
    svg_end();
}