using System;
using System.Runtime.InteropServices;
namespace Wayne.ForecourtControl
{
    /// <summary>
    /// A collection representing the allowed fuel grade maximum volume, that should be used within the authorize parameters.
    /// </summary>
    [ComVisible(true)]
    public interface IFuelGradeMaxVolumes
    {
        /// <summary>
        /// Indicates the number of fuel grades.
        /// </summary>
        int Count { get; }

        /// <summary>
        /// Indexer returning the maximum volume allowed for the fuel grade.
        /// </summary>
        /// <param name="index">Fuel grade</param>
        /// <exception cref="FuelGradeOutOfRangeException">Thrown if the fuel grade is out of range.</exception>
        decimal? this[int index] { get; set; }
    }
}