#include <iostream>
#include <vector>
#include <cmath>
#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>\n";
}
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) {
    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;
    svg_begin(400, 300);
    const size_t MAX_DOT = IMAGE_WIDTH - TEXT_WIDTH;
    double MAX_BIN = bins[0];
    for (size_t j = 1; j < bins.size(); j++){
        if (bins[j] > MAX_BIN) MAX_BIN = bins[j];
    }
    double top = 0;
    for (size_t bin : bins) {
        double bin_width = BLOCK_WIDTH * bin;
        if (bin == MAX_BIN){
            bin_width = MAX_DOT;
        }
        else bin_width = ceil(MAX_DOT * (bin / MAX_BIN));
        svg_text(TEXT_LEFT, top + TEXT_BASELINE, to_string(bin));
        svg_rect(TEXT_WIDTH, top, bin_width, BIN_HEIGHT, "black", "cyan");
        top += BIN_HEIGHT;
    }
    svg_end();
}