#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, const string& text, const string& text_decoration)
{
    cout << "<text x='" << left << "' y='" << baseline << "' text-decoration='" << text_decoration << "'>" << text << "</text>";
}

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


void
show_histogram_svg(const vector<size_t>& bins)
{
    string decoration;
    cerr<<"Enter text decoration (none, underline, overline, line-through): ";
    cin>>decoration;
    while(!(decoration=="none"||decoration=="underline"||decoration=="overline"||decoration=="line-through"))
    {
        cerr<<"Invalid value. Please enter one of: none, underline, overline, line-through: ";
        cin>>decoration;
    }

    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 BLACK = "black";
    const auto RED = "red";
    const auto MAX_WIDTH = IMAGE_WIDTH-TEXT_WIDTH;


    svg_begin(IMAGE_WIDTH,IMAGE_HEIGHT);

    double top = 0;
    double max_count = bins[0];
    for (size_t i = 0; i < bins.size(); i++)
    {
        if (max_count<bins[i])
        {
            max_count=bins[i];
        }
    }

    for (size_t bin : bins)
    {
        double bin_width = (MAX_WIDTH)*(bin/max_count);
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin), decoration);
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, BLACK, RED);
        top += BIN_HEIGHT;
    }

    svg_end();
}