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

using namespace std;

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

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

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

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

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 BIN_GAP = 5;
    const auto MAX_WIDTH = IMAGE_WIDTH - TEXT_WIDTH - 10;

    if (bins.empty()) {
        svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);
        svg_text(TEXT_LEFT, TEXT_BASELINE, "No data");
        svg_end();
        return;
    }

    // Находим максимальное значение
    size_t max_count = *max_element(bins.begin(), bins.end());

    double scaling_factor = (max_count == 0) ? 1.0 : (MAX_WIDTH / static_cast<double>(max_count));

    svg_begin(IMAGE_WIDTH, IMAGE_HEIGHT);

    double top = 0;
    for (size_t bin : bins) {
        const double bin_width = bin * scaling_factor;

        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));

        if (bin == 0) {
            svg_rect(TEXT_WIDTH, top, 1, BIN_HEIGHT, "black", "#cccccc");
        } else {
            svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", "#4169e1");
        }

        top += BIN_HEIGHT + BIN_GAP;
    }

    svg_end();
}