/// @file
/// @brief Task2: SVG-Root element https://developer.mozilla.org/en-US/docs/Web/SVG/Element/svg

#pragma once

#include "task2.Element.hpp" // task2::Element
#include "task2.aliases.hpp" // task2::BBox

#include <sstream> // std::stringstream
#include <ostream> // std::endl
#include <string>  // std::string

namespace task2 {

/// @brief Root SVG Element (combined a <svg> and a <g> element)
/// @note The group element is used to enable a common transform function for all contained elements to enable a bottom-left origin
///       (the svg-default is top-left)
/// open:  <svg preserveAspectRatio='xMidYMid meet' viewbox='0 0 {{w}} {{h}}' height='{{w}}' width='{{h}}'>
///        <g transform='matrix(1 0 0 -1 {{-xmin}} {{ymax}})'>
/// text:  empty string
/// close: </g>
///        </svg>
struct RootElement : Element {
  RootElement(BBox bbox) : bbox(bbox) {}
  std::string open() const override final {
    auto [min, max] = bbox;
    double xorg = min[0];
    double yorg = min[1];
    double w = max[0] - min[0];
    double h = max[1] - min[1];
    std::stringstream ss;
    ss << "<svg ";
    ss << "xmlns='http://www.w3.org/2000/svg' ";
    ss << "version='1.1' ";
    ss << "preserveAspectRatio='xMidYMid meet' ";
    ss << "viewbox='" << xorg << " " << yorg << " " << w << " " << h << "' ";
    ss << "width='" << w << "' ";
    ss << "height='" << h << "' ";
    ss << ">" << std::endl;
    ss << "<g transform='matrix(1 0 0 -1 " << -min[0] << " " << max[1] << ")' >";
    return ss.str();
  }
  std::string close() const override final {
    std::stringstream ss;
    ss << "</g>" << std::endl;
    ss << "</svg>";
    return ss.str();
  };
  std::string text() const override final { return std::string(); }

private:
  BBox bbox;
};

} // namespace task2