namespace Marathon.Domain.Enums;

/// <summary>Semantic classification of anomaly kinds.</summary>
public static class AnomalyKindExtensions
{
    /// <summary>
    /// Whether the kind makes a <i>directional</i> prediction — a specific side/favourite
    /// expected to win — that can be graded against the result and bet on in a backtest.
    /// </summary>
    /// <remarks>
    /// <see cref="AnomalyKind.SuspensionFlip"/> and <see cref="AnomalyKind.SteamMove"/> are
    /// directional (they point at a favourite). <see cref="AnomalyKind.SuspensionFreeze"/> is
    /// informational — the line did NOT move — so "predicting" the unchanged favourite would
    /// merely measure the base favourite-win rate; it is excluded from outcome grading and
    /// from backtest staking so it does not distort detector calibration.
    /// </remarks>
    public static bool IsDirectional(this AnomalyKind kind) => kind switch
    {
        AnomalyKind.SuspensionFlip => true,
        AnomalyKind.SteamMove => true,
        AnomalyKind.SuspensionFreeze => false,
        AnomalyKind.OverroundCompression => false,
        _ => false,
    };
}