#ifndef TOPOLOGYENUMERATOR_HPP
#define TOPOLOGYENUMERATOR_HPP
#include "nlohmann/json.hpp"
#include "patternIO.hpp"
#include "trianglepatterngeometry.hpp"
#include "trianglepattterntopology.hpp"
#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>

using GraphEdge = std::pair<size_t, size_t>;
/*
 * Represents a graph formed by slots on a triangle that can either be filled or
 * not. The slots are three and are: 1) one slot per vertex. Each slot can hold
 * a signle node. 2) one slot per edge. Each slot can hold many nodes. 3) one
 * slot in the inside of the triangle. Each slot can hold multiple nodes.
 * */
class TopologyEnumerator {
  /*
   * Holds the in a CCW order the vertex and the edge slots and then the face
   * slot. [0],[1],[2] can either be 0 or 1 [3],[4],[5] are integers in [0,n]
   * [6] an integer [0,n]
   * */

  /*
   reduced nodes per slot
        0
       /\
      /  \
     2    2
    /  4   \
   /        \
  1----3-----1

  nodes per slot
        0
       /\
      /  \
     3    5
    /  6   \
   /        \
  1----4-----2

  slot=0 -> vi=0
  slot=1 -> vi=1
  slot=2 -> vi=2
  ...
  see TrianglePatternGeometry::constructVertexVector

      */
  struct TopologicalStatistics {
    size_t numberOfPossibleEdges{0};
    size_t numberOfCoincideEdges{0};
    size_t numberOfDuplicateEdges{0};
    size_t numberOfValidEdges{0};
    size_t numberOfIntersectingEdgePairs{0};
    size_t numberOfPatterns{0};
    //    size_t numberOfIntersectingEdgesOverAllPatterns{0};
    size_t numberOfPatternsWithIntersectingEdges{0};
    size_t numberOfPatternsWithMoreThanASingleCC{0};
    size_t numberOfPatternsWithADanglingEdgeOrNode{0};
    size_t numberOfPatternsWithArticulationPoints{0};
    size_t numberOfPatternsViolatingAngleThreshold{0};
    size_t numberOfPatternsViolatingValenceThreshold{0};
    size_t numberOfPatternViolatingInterfaceEnforcement{0};
    size_t numberOfValidPatterns{0};
    nlohmann::json convertToJson() const
    {
        nlohmann::json json;
        //        json["numPossibleEdges"] = numberOfPossibleEdges;
        //        json["numCoincideEdges"] = numberOfCoincideEdges;
        //        json["numDuplicateEdges"] = numberOfDuplicateEdges;
        //        json["numValidEdges"] = numberOfValidEdges;
        //        json["numIntersectingEdgePairs"] = numberOfIntersectingEdgePairs;
        json["numPatterns"] = numberOfPatterns;
        //      json["numIntersectingEdgesOverAllPatterns"] =
        //          numberOfIntersectingEdgesOverAllPatterns;
        json["numPatternsWithIntersectingEdges"] = numberOfPatternsWithIntersectingEdges;
        json["numViolatingInterfaceEnforcement"] = numberOfPatternViolatingInterfaceEnforcement;
        json["numPatternsWithNotASingleCC"] = numberOfPatternsWithMoreThanASingleCC;
        json["numPatternsWithArticulationPoints"] = numberOfPatternsWithArticulationPoints;
        json["numPatternsWithDangling"] = numberOfPatternsWithADanglingEdgeOrNode;
        json["violatingAngle"] = numberOfPatternsViolatingAngleThreshold;
        json["violatingValence"] = numberOfPatternsViolatingValenceThreshold;
        json["numValidPatterns"] = numberOfValidPatterns;

        return json;
    }

    void print(const std::string &setupString,
               const std::filesystem::path &directoryPath) const {
      std::cout << "The setup " << setupString << std::endl;
      std::cout << "Has following statistics:" << std::endl;
      std::cout << numberOfPossibleEdges
                << " possible edges with the given arrangement of nodes"
                << std::endl;
      std::cout << numberOfCoincideEdges << " coincide edges" << std::endl;
      std::cout << numberOfDuplicateEdges << " duplicate edges" << std::endl;
      std::cout << numberOfValidEdges << " valid edges" << std::endl;
      std::cout << numberOfIntersectingEdgePairs << "intersecting edge pairs "
                << std::endl;
      std::cout << numberOfPatterns
                << " patterns can be generated with the given setup"
                << std::endl;
      //      std::cout << numberOfIntersectingEdgesOverAllPatterns
      //                << " intersecting edges found over all patterns" <<
      //                std::endl;
      std::cout << numberOfPatternsWithIntersectingEdges
                << " patterns found with intersecting edges" << std::endl;
      std::cout << numberOfPatternViolatingInterfaceEnforcement
                << " patterns found which violate interface enforcement" << std::endl;
      std::cout << numberOfPatternsWithMoreThanASingleCC
                << " patterns found with more than one connected components" << std::endl;
      std::cout << numberOfPatternsWithADanglingEdgeOrNode
                << " patterns found with a dangling node or edge" << std::endl;
      std::cout << numberOfPatternsWithArticulationPoints
                << " patterns found with an articulation point" << std::endl;
      std::cout << numberOfValidPatterns << " valid patterns were found" << std::endl;
      if (!directoryPath.empty()) {
          auto json = convertToJson();

          std::ofstream file;
          file.open(std::filesystem::path(directoryPath).append("statistics.csv").string());
          file << "setup," << setupString << "\n";
          for (const auto &el : json.items()) {
              file << el.key() << ",";
          }
          file << "\n";
          for (const auto &el : json.items()) {
              file << el.value() << ",";
          }
          file << "\n";
      }
    }

    void reset()
    {
        numberOfPossibleEdges = 0;
        numberOfCoincideEdges = 0;
        numberOfDuplicateEdges = 0;
        numberOfValidEdges = 0;
        numberOfIntersectingEdgePairs = 0;
        numberOfPatterns = 0;
        numberOfPatternsWithIntersectingEdges = 0;
        numberOfPatternViolatingInterfaceEnforcement = 0;
        ;
        numberOfPatternsWithMoreThanASingleCC = 0;
        numberOfPatternsWithADanglingEdgeOrNode = 0;
        numberOfPatternsWithArticulationPoints = 0;
        numberOfValidPatterns = 0;
        numberOfPatternsViolatingAngleThreshold = 0;
        numberOfPatternsViolatingValenceThreshold = 0;
    }
  };

  TopologicalStatistics statistics;
  std::vector<size_t> numberOfNodesPerSlot;
  size_t numberOfNodes;

  size_t
  computeCoincideEdges(const std::vector<size_t> &numberOfNodesPerSlot) const;
  size_t computeNumberOfPossibleEdges(
      const std::vector<size_t> &numberOfNodesPerSlot) const;

  void createLabelMesh(const std::vector<vcg::Point3d> vertices,
                       const std::filesystem::path &savePath) const;
  size_t getEdgeIndex(size_t ni0, size_t ni1) const;

public:
  TopologyEnumerator();

  void
  computeValidPatterns(const std::vector<size_t> &reducedNumberOfNodesPerSlot, const std::string &desiredResultsPath, const int& numberOfDesiredEdges=-1);

private:
  std::vector<size_t>
  getCoincideEdges(const std::vector<size_t> &edgeNodeIndices) const;
  bool isValidPattern(const std::string &patternIndex,
                      const std::vector<vcg::Point2i> &validEdges,
                      const size_t &numberOfDesiredEdges) const;
  std::vector<vcg::Point2i>
  getValidEdges(const std::vector<size_t> &numberOfNodesPerSlot,
                const std::filesystem::path &resultsPath,
                const PatternGeometry &patternGeometryAllEdges,
                const std::vector<vcg::Point2i> &allPossibleEdges);
  std::unordered_set<size_t> computeDuplicateEdges();
  std::unordered_set<size_t>
  computeCoincideEdges(const std::vector<size_t> &numberOfNodesPerSlot);
  void computeEdgeNodes(const std::vector<size_t> &numberOfNodesPerSlot,
                        std::vector<size_t> &nodesEdge0,
                        std::vector<size_t> &nodesEdge1,
                        std::vector<size_t> &nodesEdge2);
  std::unordered_set<size_t>
  computeDuplicateEdges(const std::vector<size_t> &numberOfNodesPerSlot);
  void computeValidPatterns(
      const std::vector<size_t> &numberOfNodesPerSlot,
      const size_t &numberOfDesiredEdges,
      const std::filesystem::path &resultsPath,
      const std::vector<vcg::Point3d> &vertices,
      const std::unordered_map<size_t, std::unordered_set<size_t>> &intersectingEdges,
      const std::vector<vcg::Point2i> &validEdges,
      const std::unordered_set<VertexIndex> &interfaceNodes);
  void exportPattern(const std::filesystem::path &saveToPath,
                     PatternGeometry &patternGeometry,
                     const bool saveTilledPattern) const;
};
#endif // TOPOLOGYENUMERATOR_HPP