namespace NeonSprawl.Server.Game.Factions;

/// <summary>
/// Orchestrates auditable faction standing apply: standing mutation + append-only audit row (NEO-136).
/// Quest reward wiring: <see cref="Rewards.RewardRouterOperations"/> (NEO-138).
/// NEO-141 telemetry hook site: successful apply path in <see cref="TryApplyDelta"/>.
/// </summary>
public static class ReputationOperations
{
    /// <summary>
    /// Applies a signed standing delta for one player+faction, clamps to faction bounds, and appends one audit row.
    /// Callers must not invoke <see cref="IFactionStandingStore.TryApplyStandingDelta"/> alone for game apply.
    /// </summary>
    public static ReputationApplyOutcome TryApplyDelta(
        string playerId,
        string factionId,
        int deltaAmount,
        string deltaId,
        string sourceKind,
        string sourceId,
        IFactionStandingStore standingStore,
        IReputationDeltaStore auditStore,
        TimeProvider timeProvider)
    {
        if (deltaAmount == 0)
        {
            return Deny(ReputationApplyReasonCodes.InvalidDelta);
        }

        var normalizedDeltaId = deltaId.Trim();
        if (normalizedDeltaId.Length == 0)
        {
            return Deny(ReputationApplyReasonCodes.InvalidDeltaId);
        }

        var normalizedSourceKind = sourceKind.Trim();
        var normalizedSourceId = sourceId.Trim();
        if (normalizedSourceKind.Length == 0 || normalizedSourceId.Length == 0)
        {
            return Deny(ReputationApplyReasonCodes.InvalidSource);
        }

        var mutation = standingStore.TryApplyStandingDelta(playerId, factionId, deltaAmount);
        if (!mutation.Success)
        {
            return new ReputationApplyOutcome(
                false,
                mutation.ReasonCode,
                mutation.PreviousStanding,
                mutation.NewStanding,
                null);
        }

        var row = new ReputationDeltaRow(
            normalizedDeltaId,
            playerId,
            factionId,
            deltaAmount,
            mutation.NewStanding,
            normalizedSourceKind,
            normalizedSourceId,
            timeProvider.GetUtcNow());

        if (auditStore.TryAppend(row))
        {
            // --- Telemetry hook site (NEO-141): future E9.M1 catalog event `reputation_delta` ---
            return new ReputationApplyOutcome(
                true,
                null,
                mutation.PreviousStanding,
                mutation.NewStanding,
                row);
        }

        _ = standingStore.TryApplyStandingDelta(playerId, factionId, -deltaAmount);
        return new ReputationApplyOutcome(
            false,
            ReputationApplyReasonCodes.AuditAppendFailed,
            mutation.PreviousStanding,
            mutation.PreviousStanding,
            null);
    }

    private static ReputationApplyOutcome Deny(string reasonCode) =>
        new(false, reasonCode, 0, 0, null);
}