namespace SIGCM2.Application.Pricing.ChargeableChars;

/// <summary>
/// PRC-001 — Application service for resolving active chargeable-char config for a Medio.
///
/// Priority rule: per-medio row overrides global (MedioId IS NULL) for the same Symbol.
/// Returns a dictionary keyed by Symbol for O(1) lookup during word-count pricing.
/// </summary>
public interface IChargeableCharConfigService
{
    /// <summary>
    /// Returns the resolved active config for the given medio as of the given date.
    /// Per-medio rows take priority over global rows for the same Symbol.
    /// Global rows are used as fallback when no per-medio row exists for that Symbol.
    /// Returns an empty dictionary if no config exists at all.
    /// </summary>
    Task<IReadOnlyDictionary<string, ChargeableCharSnapshot>> GetActiveConfigForMedioAsync(
        long medioId,
        DateOnly asOf,
        CancellationToken ct = default);
}