#include <catch2/catch_test_macros.hpp>
#include <catch2/catch_approx.hpp>
#include <catch2/generators/catch_generators.hpp>
#include "BayesMetrics.h"
#include "TestUtils.h"


TEST_CASE("Metrics Test", "[BayesNet]")
{
    std::string file_name = GENERATE("glass", "iris", "ecoli", "diabetes");
    map<std::string, pair<int, std::vector<int>>> resultsKBest = {
        {"glass", {7, { 0, 1, 7, 6, 3, 5, 2 }}},
        {"iris", {3, { 0, 3, 2 }} },
        {"ecoli", {6, { 2, 4, 1, 0, 6, 5 }}},
        {"diabetes", {2, { 7, 1 }}}
    };
    map<std::string, double> resultsMI = {
        {"glass", 0.12805398},
        {"iris", 0.3158139948},
        {"ecoli", 0.0089431099},
        {"diabetes", 0.0345470614}
    };
    map<pair<std::string, int>, std::vector<pair<int, int>>> resultsMST = {
        { {"glass", 0}, { {0, 6}, {0, 5}, {0, 3}, {5, 1}, {5, 8}, {5, 4}, {6, 2}, {6, 7} } },
        { {"glass", 1}, { {1, 5}, {5, 0}, {5, 8}, {5, 4}, {0, 6}, {0, 3}, {6, 2}, {6, 7} } },
        { {"iris", 0}, { {0, 1}, {0, 2}, {1, 3} } },
        { {"iris", 1}, { {1, 0}, {1, 3}, {0, 2} } },
        { {"ecoli", 0}, { {0, 1}, {0, 2}, {1, 5}, {1, 3}, {5, 6}, {5, 4} } },
        { {"ecoli", 1}, { {1, 0}, {1, 5}, {1, 3}, {5, 6}, {5, 4}, {0, 2} } },
        { {"diabetes", 0}, { {0, 7}, {0, 2}, {0, 6}, {2, 3}, {3, 4}, {3, 5}, {4, 1} } },
        { {"diabetes", 1}, { {1, 4}, {4, 3}, {3, 2}, {3, 5}, {2, 0}, {0, 7}, {0, 6} } }
    };
    auto raw = RawDatasets(file_name, true);
    bayesnet::Metrics metrics(raw.dataset, raw.featurest, raw.classNamet, raw.classNumStates);

    SECTION("Test Constructor")
    {
        REQUIRE(metrics.getScoresKBest().size() == 0);
    }

    SECTION("Test SelectKBestWeighted")
    {
        std::vector<int> kBest = metrics.SelectKBestWeighted(raw.weights, true, resultsKBest.at(file_name).first);
        REQUIRE(kBest.size() == resultsKBest.at(file_name).first);
        REQUIRE(kBest == resultsKBest.at(file_name).second);
    }

    SECTION("Test Mutual Information")
    {
        auto result = metrics.mutualInformation(raw.dataset.index({ 1, "..." }), raw.dataset.index({ 2, "..." }), raw.weights);
        REQUIRE(result == Catch::Approx(resultsMI.at(file_name)).epsilon(raw.epsilon));
    }

    SECTION("Test Maximum Spanning Tree")
    {
        auto weights_matrix = metrics.conditionalEdge(raw.weights);
        for (int i = 0; i < 2; ++i) {
            auto result = metrics.maximumSpanningTree(raw.featurest, weights_matrix, i);
            REQUIRE(result == resultsMST.at({ file_name, i }));
        }
    }
}