namespace MeterVault.Core.Domain;

/// <summary>
/// A price component with a validity range (price history), scoped globally, per energy
/// type, or per meter (SDD §5.3 <c>tariff</c>, FR-9). <see cref="ValidTo"/> null = open-ended.
/// </summary>
public sealed class Tariff
{
    public int Id { get; set; }

    public TariffScope ScopeType { get; set; }

    /// <summary>energy_type.id or meter.id; null for global scope.</summary>
    public int? ScopeId { get; set; }

    public TariffComponent Component { get; set; }

    public double Value { get; set; }

    /// <summary>e.g. 'EUR/kWh', 'EUR/m3', 'EUR/100L', 'EUR/month'.</summary>
    public required string Unit { get; set; }

    public string Currency { get; set; } = "EUR";

    public DateOnly ValidFrom { get; set; }

    public DateOnly? ValidTo { get; set; }

    public string? Notes { get; set; }
}