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#ifndef __OPENCV_STITCHING_UTIL_HPP__
#define __OPENCV_STITCHING_UTIL_HPP__

#include <list>
#include "precomp.hpp"

#define ENABLE_LOG 1

#if ENABLE_LOG
  #include <iostream>
  #define LOG(msg) { std::cout << msg; std::cout.flush(); }
#else
  #define LOG(msg)
#endif

#define LOGLN(msg) LOG(msg << std::endl)


class DisjointSets
{
public:
    DisjointSets(int elem_count = 0) { createOneElemSets(elem_count); }

    void createOneElemSets(int elem_count);
    int findSetByElem(int elem);
    int mergeSets(int set1, int set2);

    std::vector<int> parent;
    std::vector<int> size;

private:
    std::vector<int> rank_;
};


struct GraphEdge
{
    GraphEdge(int from, int to, float weight) 
        : from(from), to(to), weight(weight) {}
    bool operator <(const GraphEdge& other) const { return weight < other.weight; }
    bool operator >(const GraphEdge& other) const { return weight > other.weight; }

    int from, to;
    float weight;
};


class Graph
{
public:
    Graph(int num_vertices = 0) { create(num_vertices); }
    void create(int num_vertices) { edges_.assign(num_vertices, std::list<GraphEdge>()); }
    int numVertices() const { return static_cast<int>(edges_.size()); }
    void addEdge(int from, int to, float weight);
    template <typename B> B forEach(B body) const;
    template <typename B> B walkBreadthFirst(int from, B body) const;
    
private:
    std::vector< std::list<GraphEdge> > edges_;
};


//////////////////////////////////////////////////////////////////////////////
// Auxiliary functions

bool overlapRoi(cv::Point tl1, cv::Point tl2, cv::Size sz1, cv::Size sz2, cv::Rect &roi);
cv::Rect resultRoi(const std::vector<cv::Point> &corners, const std::vector<cv::Mat> &images);
cv::Rect resultRoi(const std::vector<cv::Point> &corners, const std::vector<cv::Size> &sizes);
cv::Point resultTl(const std::vector<cv::Point> &corners);

// Returns random 'count' element subset of the {0,1,...,size-1} set
void selectRandomSubset(int count, int size, std::vector<int> &subset);

#include "util_inl.hpp"

#endif // __OPENCV_STITCHING_UTIL_HPP__