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

using namespace std;

namespace svg {
    size_t BLOCK_WIDTH = 10;

    size_t input_block_width() {
        size_t width;
        while (true) {
            cout << "Введите ширину блока гистограммы (3-30px): ";
            cin >> width;

            if (width < 3) {
                cout << "Ширина слишком мала. Минимальное значение: 3px. Пожалуйста, повторите ввод.\n";
            } else if (width > 30) {
                cout << "Ширина слишком велика. Максимальное значение: 30px. Пожалуйста, повторите ввод.\n";
            } else {
                break;
            }
        }
        return width;
    }

    void set_block_width(size_t width) {
        BLOCK_WIDTH = width;
    }

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

    void end(ostream& out) {
        out << "</svg>\n";
    }

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

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

void show_histogram_svg(ofstream& out, const vector<size_t>& bins, size_t block_width) {
    begin(out, IMAGE_WIDTH, IMAGE_HEIGHT);

    if (bins.empty()) {
        end(out);
        return;
    }

    const size_t max_count = *max_element(bins.begin(), bins.end());
    if (max_count == 0) {
        end(out);
        return;
    }


    const double max_svg_width = IMAGE_WIDTH - TEXT_WIDTH - 40;


    const double scale = max_svg_width / max_count;

    double top = 0;
    for (size_t bin : bins) {

        double width = bin * scale * (block_width / 10.0);

        text(out, TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
        rect(out, TEXT_WIDTH, top, width, BIN_HEIGHT, "black", "#aaffaa");

        top += BIN_HEIGHT;
    }

    end(out);
}
}