#include "web_server/src/Sliding_Statistics.hpp"
#include <gtest/gtest.h>
#include <limits>

namespace aethera::web {
TEST(Sliding_Statistics, Derives_Window_Statistics_On_Demand) {
    Sliding_Statistics statistics{20};
    for (int value = 1; value <= 20; ++value)
        statistics.submit(static_cast<double>(value));

    const auto snapshot = statistics.snapshot();
    EXPECT_EQ(snapshot.count, 20U);
    EXPECT_DOUBLE_EQ(snapshot.latest, 20.0);
    EXPECT_DOUBLE_EQ(snapshot.minimum, 1.0);
    EXPECT_DOUBLE_EQ(snapshot.maximum, 20.0);
    EXPECT_DOUBLE_EQ(snapshot.average, 10.5);
    EXPECT_DOUBLE_EQ(snapshot.trimmed_average, 10.5);
    EXPECT_DOUBLE_EQ(snapshot.p50, 10.0);
    EXPECT_DOUBLE_EQ(snapshot.p95, 19.0);
    EXPECT_DOUBLE_EQ(snapshot.p99, 20.0);
}

TEST(Sliding_Statistics, Overwrites_Oldest_And_Ignores_Nonfinite_Values) {
    Sliding_Statistics statistics{3};
    statistics.submit(1.0);
    statistics.submit(2.0);
    statistics.submit(std::numeric_limits<double>::infinity());
    statistics.submit(3.0);
    statistics.submit(4.0);

    const auto snapshot = statistics.snapshot();
    EXPECT_EQ(snapshot.count, 3U);
    EXPECT_DOUBLE_EQ(snapshot.latest, 4.0);
    EXPECT_DOUBLE_EQ(snapshot.minimum, 2.0);
    EXPECT_DOUBLE_EQ(snapshot.maximum, 4.0);
    EXPECT_DOUBLE_EQ(snapshot.average, 3.0);
}
}