#pragma once
#include "graph.hpp"
#include <array>
#include <iostream>
#include <vector>

std::ostream &operator<<(std::ostream &s, const Edge &e) {
    s << '{' << e.u << ',' << e.v << '}';
    return s;
}

// Mathematica style export
std::ostream &operator<<(std::ostream &s, const Graph &g) {
    if (g.edgeCount() == 0) {
        s << '{' << '}';
        return s;
    }
    s << '{' << g.getEdge(0).u << '<' << '-' << '>' << g.getEdge(0).v;
    for (unsigned int i = 1; i < g.edgeCount(); ++i) {
        const Edge &e = g.getEdge(i);
        s << ',' << e.u << '<' << '-' << '>' << e.v;
    }
    s << '}';
    return s;
}

template <typename FwdIterator>
std::ostream& output_array(std::ostream& s, FwdIterator begin,
                           FwdIterator end) {
    if (begin == end) {
        s << '{' << '}';
        return s;
    }
    s << '{' << *begin++;
    for (; begin != end; ++begin) {
        s << ',' << *begin;
    }
    s << '}';
    return s;
}

template <typename T>
std::ostream& operator<<(std::ostream& s, const std::vector<T>& v) {
    return output_array(s, std::begin(v), std::end(v));
}

// Mathematica style export for normal arrays
// SFINAE to disable char arrays since it will mess up
// things of the form  s << "some string";
template <
    typename T, std::size_t N,
    typename = typename std::enable_if<!std::is_same<T, char>::value>::type>
std::ostream& operator<<(std::ostream& s, const T (&v)[N]) {
    return output_array(s, std::begin(v), std::end(v));
}

template <typename T, std::size_t N>
std::ostream& operator<<(std::ostream& s, const std::array<T, N>& v) {
    return output_array(s, std::begin(v), std::end(v));
}