/*

Copyright (c) 2015, Project OSRM contributors
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are permitted provided that the following conditions are met:

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*/

#ifndef MATRIX_GRAPH_WRAPPER_H
#define MATRIX_GRAPH_WRAPPER_H

#include <vector>

//This Wrapper provides all methods that are needed for TarjanSCC, when the graph is given in a
//matrix representation (e.g. as output from a distance table call)

template <typename T> class MatrixGraphWrapper {
public:

    MatrixGraphWrapper(std::vector<T> table, const unsigned number_of_nodes) : table_(table), number_of_nodes_(number_of_nodes) {};

    unsigned GetNumberOfNodes() const {
        return number_of_nodes_;
    }

    std::vector<unsigned> GetAdjacentEdgeRange(const unsigned node) const {
        std::vector<unsigned> edges;
        const auto maxint = std::numeric_limits<int>::max();
        for (auto i = 0; i < number_of_nodes_; ++i) {
            if (*(table_.begin() + node * number_of_nodes_ + i) != maxint) {
                edges.push_back(i);
            }
        }
        return edges;
    }

    unsigned GetTarget(const unsigned edge) const {
        return edge;
    }

private:
    std::vector<T> table_;
    const unsigned number_of_nodes_;
};


#endif // MATRIX_GRAPH_WRAPPER_H