#pragma once

#include <cstddef>
#include <string>
#include <string_view>
#include <vector>

#include "graphviz_graph.h"
#include "svg_analyzer_interface.h"
#include "svg_element.h"

/**
 * @brief The SVGAnalyzer class analyzes the contents of an SVG document and
 * identifies Graphviz graphs, nodes and edges.
 */

class SVGAnalyzer : public ISVGAnalyzer {
public:
  SVGAnalyzer(char *text);
  /// Return a non-mutable reference to the list of Graphviz graphs
  const std::vector<GraphvizGraph> &graphs() const;
  void on_enter_element_svg() override;
  void on_enter_element_g() override;
  void on_enter_element_circle() override;
  void on_enter_element_ellipse() override;
  void on_enter_element_line() override;
  void on_enter_element_path() override;
  void on_enter_element_polygon() override;
  void on_enter_element_polyline() override;
  void on_enter_element_rect() override;
  void on_enter_element_text() override;
  void on_enter_element_title() override;
  void on_exit_element() override;
  void path_cubic_bezier_to(double x1, double y1, double x2, double y2,
                            double x, double y) override;
  void path_move_to(double x, double y) override;
  void path_exit() override;
  void set_cx(double cx) override;
  void set_cy(double cy) override;
  void set_font_family(std::string_view font_family) override;
  void set_font_size(double font_size) override;
  void set_fill(std::string_view fill) override;
  void set_fill_opacity(double fill_opacity) override;
  void set_height(double height) override;
  void set_id(std::string_view id) override;
  void set_rx(double rx) override;
  void set_ry(double ry) override;
  void set_class(std::string_view) override;
  void set_stroke(std::string_view stroke) override;
  void set_stroke_opacity(double stroke_opacity) override;
  void set_stroke_width(double stroke_width) override;
  void set_point(std::pair<double, double> point) override;
  void set_text(std::string_view text) override;
  void set_text_anchor(std::string_view text_anchor) override;
  void set_transform(double a, double b, double c, double d, double e,
                     double f) override;
  void set_viewBox(double x, double y, double width, double height) override;
  void set_width(double width) override;
  void set_x(double x) override;
  void set_y(double y) override;
  /// Create an SVGAnalyzer from DOT source using the `engine` layout engine.
  ///
  /// \param dot_source The DOT source
  /// \param engine The Graphviz layout engine
  static SVGAnalyzer make_from_dot(const std::string &dot_source,
                                   const std::string &engine = "dot");
  std::size_t num_svgs() const { return m_num_svgs; };
  std::size_t num_groups() const { return m_num_groups; };
  std::size_t num_circles() const { return m_num_circles; };
  std::size_t num_ellipses() const { return m_num_ellipses; };
  std::size_t num_lines() const { return m_num_lines; };
  std::size_t num_paths() const { return m_num_paths; };
  std::size_t num_polygons() const { return m_num_polygons; };
  std::size_t num_polylines() const { return m_num_polylines; };
  std::size_t num_rects() const { return m_num_rects; };
  std::size_t num_texts() const { return m_num_texts; };
  std::size_t num_titles() const { return m_num_titles; };
  /// Return a view of the original SVG
  std::string_view original_svg() const;
  /// Re-create the SVG from the internal data structure and verify it against
  /// the original SVG produced by Graphviz
  void re_create_and_verify_svg();
  void set_graphviz_version(std::string_view version);
  void set_graphviz_build_date(std::string_view build_date);
  std::string svg_string(std::size_t indent_size = 2) const;

private:
  /// Get the current element being processed by the SVG document traverser
  SVG::SVGElement &current_element();
  /// Enter a new SVG element retrieved by the SVG document traverser into the
  /// list of elements currently being processed
  void enter_element(SVG::SVGElementType type);
  /// Get the grandparent element of the current element being processed by the
  /// SVG document traverser
  SVG::SVGElement &grandparent_element();
  /// Get the parent element of the current element being processed by the SVG
  /// document traverser
  SVG::SVGElement &parent_element();
  /// Traverses the processed SVG element hierarchy, identifies nodes and edges,
  /// creates objects representing them and stores them in lists
  void retrieve_graphviz_components();
  void retrieve_graphviz_components_impl(SVG::SVGElement &parent_svg_element);

  /// A list of pointers to elements currently being processed by the SVG++
  /// document traverser, in hierarchical order. The front element is the top
  /// level SVG and the back element is the current element.
  std::vector<SVG::SVGElement *> m_elements_in_process;
  std::size_t m_num_svgs = 1; // the top level svg is implicit. See
                              // https://github.com/svgpp/svgpp/issues/98
  std::size_t m_num_groups = 0;
  std::size_t m_num_circles = 0;
  std::size_t m_num_ellipses = 0;
  std::size_t m_num_lines = 0;
  std::size_t m_num_paths = 0;
  std::size_t m_num_polygons = 0;
  std::size_t m_num_polylines = 0;
  std::size_t m_num_rects = 0;
  std::size_t m_num_texts = 0;
  std::size_t m_num_titles = 0;
  /// A list of Graphviz recreated graphs
  std::vector<GraphvizGraph> m_graphs;
  /// The original SVG document
  std::string m_original_svg;
  /// The top level SVG `svg` element corresponding to the Graphviz graph
  SVG::SVGElement m_svg;
};
