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#pragma once

#include <atomic>
#include <set>
#include <vector>

#include <Tensile/PropertyMatching.hpp>

#include <tensilelitehost/export.h>

namespace TensileLite
{
    /**
     * \ingroup SolutionLibrary
     *
     * Uses a distance function to select solutions based on benchmarks.
     * Benchmarks are performed to determine the optimal solution at a number of
     * specific sizes. At runtime, we find the benchmarked size that is closest
     * to the size asked for.
     */
    template <typename MyProblem, typename MySolution = typename MyProblem::Solution>
    struct ProblemMatchingLibrary : public SolutionLibrary<MyProblem, MySolution>
    {
        using Element = std::shared_ptr<SolutionLibrary<MyProblem, MySolution>>;
        using Table   = Matching::MatchingTable<MyProblem, Element, std::shared_ptr<MySolution>>;
        std::shared_ptr<Table>    table;
        mutable std::atomic<bool> lastFindTopRetAll = false;

        static std::string Type()
        {
            return "Matching";
        }
        virtual std::string type() const override
        {
            return Type();
        }
        virtual std::string description() const override
        {
            if(table == nullptr)
                return concatenate(type(), ", table: nullptr");
            else
                return concatenate(type(), ": ", table->description());
        }

        virtual std::shared_ptr<MySolution> getSolutionByIndex(MyProblem const& problem,
                                                               Hardware const&  hardware,
                                                               const int index) const override
        {
            typename Table::Transform transform
                = [&](Element library) -> std::shared_ptr<MySolution> {
                return library->getSolutionByIndex(problem, hardware, index);
            };
            double                      fitness;
            std::shared_ptr<MySolution> solution;
            std::tie(solution, fitness) = table->findBestMatch(problem, transform);
            return solution;
        }

        virtual std::shared_ptr<MySolution> findBestSolution(MyProblem const& problem,
                                                             Hardware const&  hardware,
                                                             double*          fitness
                                                             = nullptr) const override
        {
            typename Table::Transform transform
                = [&](Element library) -> std::shared_ptr<MySolution> {
                return library->findBestSolution(problem, hardware);
            };

            double localFitness = std::numeric_limits<double>::max();
            fitness             = (fitness) ? fitness : &localFitness;
            std::shared_ptr<MySolution> solution;
            std::tie(solution, *fitness) = table->findBestMatch(problem, transform);
            return solution;
        }

        virtual SolutionSet<MySolution>
            findAllSolutions(MyProblem const&          problem,
                             Hardware const&           hardware,
                             SolutionLibrarySearchType searchType
                             = SolutionLibrarySearchType::DEFAULT) const override
        {
            SolutionSet<MySolution> rv;

            auto matches = searchType != SolutionLibrarySearchType::DEFAULT
                               ? table->GetAll()
                               : table->matchesInOrder(problem);

            for(auto const& row : matches)
            {
                auto rowSolutions = row->findAllSolutions(problem, hardware, searchType);
                rv.insert(rowSolutions.begin(), rowSolutions.end());
            }

            return rv;
        }

        virtual SolutionSet<MySolution>
            findAllSolutionsGroupedGemm(std::vector<MyProblem> const& problems,
                                        Hardware const&               hardware,
                                        SolutionLibrarySearchType     searchType
                                        = SolutionLibrarySearchType::DEFAULT) const override
        {
            SolutionSet<MySolution> rv;

            auto matches = searchType != SolutionLibrarySearchType::DEFAULT
                               ? table->GetAll()
                               : table->matchesInOrder(problems[0]);

            for(auto const& row : matches)
            {
                auto rowSolutions
                    = row->findAllSolutionsGroupedGemm(problems, hardware, searchType);
                rv.insert(rowSolutions.begin(), rowSolutions.end());
            }

            return rv;
        }

        virtual SolutionVector<MySolution> findTopSolutions(MyProblem const& problem,
                                                            Hardware const&  hardware,
                                                            int numSolutions) const override
        {
            typename Table::Transform transform
                = [&](Element library) -> std::shared_ptr<MySolution> {
                return library->findBestSolution(problem, hardware);
            };
            SolutionVector<MySolution> solutions
                = table->findTopMatch(problem, transform, numSolutions);

            if(Debug::Instance().printLibraryLogicIndex())
            {
                if(!solutions.empty()) {
                    std::cout << "Library logic index of top solutions: ";
                    for (auto &rv : solutions)
                        std::cout << rv->libraryLogicIndex << ", ";
                    std::cout << std::endl;
                }
                else
                    std::cout << "No solution found" << std::endl;
            }

            // can't reach the requested number, means findTop already done its best
            lastFindTopRetAll = (solutions.size() < numSolutions);
            return solutions;
        }

        virtual bool lastFindTopAlreadyRetAll() const override
        {
            return lastFindTopRetAll;
        }

        virtual SolutionVector<MySolution>
            findTopSolutionsGroupedGemm(std::vector<MyProblem> const& problems,
                                        Hardware const&               hardware,
                                        int                           numSolutions) const override
        {
            typename Table::Transform transform
                = [&](Element library) -> std::shared_ptr<MySolution> {
                return library->findBestSolution(problems, hardware);
            };
            SolutionVector<MySolution> solutions
                = table->findTopMatch(problems[0], transform, numSolutions);
            return solutions;
        }
    };
} // namespace TensileLite