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

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

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

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

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


void
show_histogram_svg(const std::vector<size_t>& bins, const std::string& fill, const std::string& stroke) {
    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 size_t MAX_ASTERISK = IMAGE_WIDTH - TEXT_WIDTH;

    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);

    size_t maxlen = 0;
    for (size_t len : bins)
    {
        if (maxlen<len) maxlen = len;
    }

    double top = 0;
    for (size_t bin : bins) {
        size_t wight = bin;
        if ((maxlen*10) > MAX_ASTERISK){
            if (maxlen != bin) wight = MAX_ASTERISK * (static_cast <double> (bin/maxlen));
            else if (maxlen == bin) wight = MAX_ASTERISK;
        }
        const double bin_width = BLOCK_WIDTH * wight;
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, stroke, fill);
        top += BIN_HEIGHT;
    }
    /*
    double top = 0;
    for (size_t bin : bins) {
        const double bin_width = BLOCK_WIDTH * bin;
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, std::to_string(bin));
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, stroke, fill);
        top += BIN_HEIGHT;
    }

    //svg_text(20, 20, std::to_string(bins[0]));
    //svg_rect(50, 0, bins[0] * 10, 30);*/
    svg_end();
}