#include "gtest/gtest.h"
#include "../Metrics.h"
#include "../CPPFImdlp.h"
#include <iostream>

namespace mdlp {
    class TestFImdlp: public CPPFImdlp, public testing::Test {
    public:
        precision_t precision = 0.000001;
        TestFImdlp(): CPPFImdlp() {}
        void SetUp()
        {
            //    5.0, 5.1, 5.1, 5.1, 5.2, 5.3, 5.6, 5.7, 5.9, 6.0]
            //(5.0, 1) (5.1, 1) (5.1, 2) (5.1, 2) (5.2, 1) (5.3, 1) (5.6, 2) (5.7, 1) (5.9, 2) (6.0, 2)
            X = { 5.7, 5.3, 5.2, 5.1, 5.0, 5.6, 5.1, 6.0, 5.1, 5.9 };
            y = { 1, 1, 1, 1, 1, 2, 2, 2, 2, 2 };
            algorithm = false;
            fit(X, y);
        }
        void setalgorithm(bool value)
        {
            algorithm = value;
        }
        void checkSortedVector()
        {
            indices_t testSortedIndices = sortIndices(X, y);
            precision_t prev = X[testSortedIndices[0]];
            for (auto i = 0; i < X.size(); ++i) {
                EXPECT_EQ(testSortedIndices[i], indices[i]);
                EXPECT_LE(prev, X[testSortedIndices[i]]);
                prev = X[testSortedIndices[i]];
            }
        }
        void checkCutPoints(cutPoints_t& expected)
        {
            int expectedSize = expected.size();
            EXPECT_EQ(cutPoints.size(), expectedSize);
            for (auto i = 0; i < cutPoints.size(); i++) {
                EXPECT_NEAR(cutPoints[i], expected[i], precision);
            }
        }
        template<typename T, typename A>
        void checkVectors(std::vector<T, A> const& expected, std::vector<T, A> const& computed)
        {
            EXPECT_EQ(expected.size(), computed.size());
            ASSERT_EQ(expected.size(), computed.size());
            for (auto i = 0; i < expected.size(); i++) {
                EXPECT_NEAR(expected[i], computed[i], precision);
            }
        }
    };
    TEST_F(TestFImdlp, FitErrorEmptyDataset)
    {
        X = samples_t();
        y = labels_t();
        EXPECT_THROW(fit(X, y), std::invalid_argument);
    }
    TEST_F(TestFImdlp, FitErrorDifferentSize)
    {
        X = { 1, 2, 3 };
        y = { 1, 2 };
        EXPECT_THROW(fit(X, y), std::invalid_argument);
    }
    TEST_F(TestFImdlp, SortIndices)
    {
        X = { 5.7, 5.3, 5.2, 5.1, 5.0, 5.6, 5.1, 6.0, 5.1, 5.9 };
        indices = { 4, 3, 6, 8, 2, 1, 5, 0, 9, 7 };
        checkSortedVector();
        X = { 5.77, 5.88, 5.99 };
        indices = { 0, 1, 2 };
        checkSortedVector();
        X = { 5.33, 5.22, 5.11 };
        indices = { 2, 1, 0 };
        checkSortedVector();
    }

    TEST_F(TestFImdlp, TestDataset)
    {
        algorithm = 0;
        fit(X, y);
        computeCutPoints(0, 10);
        cutPoints_t expected = { 5.6499996185302734 };
        vector<precision_t> computed = getCutPoints();
        computed = getCutPoints();
        int expectedSize = expected.size();
        EXPECT_EQ(computed.size(), expected.size());
        for (auto i = 0; i < expectedSize; i++) {
            EXPECT_NEAR(computed[i], expected[i], precision);
        }
    }
    TEST_F(TestFImdlp, ComputeCutPoints)
    {
        cutPoints_t expected = { 5.65 };
        algorithm = false;
        computeCutPoints(0, 10);
        checkCutPoints(expected);
    }
    TEST_F(TestFImdlp, ComputeCutPointsGCase)
    {
        cutPoints_t expected;
        algorithm = false;
        expected = { 2 };
        samples_t X_ = { 0, 1, 2, 2 };
        labels_t y_ = { 1, 1, 1, 2 };
        fit(X_, y_);
        checkCutPoints(expected);
    }
    TEST_F(TestFImdlp, ComputeCutPointsalAlternative)
    {
        algorithm = true;
        cutPoints_t expected;
        expected = {};
        fit(X, y);
        computeCutPointsAlternative(0, 10);
        checkCutPoints(expected);
    }
    TEST_F(TestFImdlp, ComputeCutPointsAlternativeGCase)
    {
        cutPoints_t expected;
        expected = { 1.5 };
        algorithm = true;
        samples_t X_ = { 0, 1, 2, 2 };
        labels_t y_ = { 1, 1, 1, 2 };
        fit(X_, y_);
        checkCutPoints(expected);
    }
    TEST_F(TestFImdlp, GetCutPoints)
    {
        samples_t computed, expected = { 5.65 };
        algorithm = false;
        computeCutPoints(0, 10);
        computed = getCutPoints();
        for (auto item : cutPoints)
            cout << setprecision(6) << item << endl;
        checkVectors(expected, computed);
    }
}