#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, string fill) {
    cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' stroke='" << stroke << "' fill='" << fill << "' />";
}

void show_histogram_svg(const vector<size_t>& bins, size_t block_width) {
    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.empty() ? 0 : bins[0];
    for (size_t i = 1; i < bins.size(); i++) {
        if (bins[i] > max_count) {
            max_count = bins[i];
        }
    }

    for (size_t bin : bins) {
        double bin_width = static_cast<double>(block_width) * bin;
        if (bin_width > MAX_WIDTH) {
            bin_width = MAX_WIDTH;
        }
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, BLACK, RED);
        top += BIN_HEIGHT;
    }

    svg_end();
}