using System;
using AutoMapper;
using EnvelopeGenerator.Domain.Interfaces.Auditing;

namespace EnvelopeGenerator.Application.Common.Extensions;

/// <summary>
/// Extension methods for applying auditing timestamps during AutoMapper mappings.
/// </summary>
public static class AutoMapperAuditingExtensions
{
    /// <summary>
    /// Maps <see cref="IHasAddedWhen.AddedWhen"/> to the current UTC time.
    /// </summary>
    public static IMappingExpression<TSource, TDestination> MapAddedWhen<TSource, TDestination>(this IMappingExpression<TSource, TDestination> expression)
        where TDestination : IHasAddedWhen
        => expression.ForMember(dest => dest.AddedWhen, opt => opt.MapFrom(_ => DateTime.UtcNow));

    /// <summary>
    /// Maps <see cref="IHasChangedWhen.ChangedWhen"/> to the current UTC time.
    /// </summary>
    public static IMappingExpression<TSource, TDestination> MapChangedWhen<TSource, TDestination>(this IMappingExpression<TSource, TDestination> expression)
        where TDestination : IHasChangedWhen
        => expression.ForMember(dest => dest.ChangedWhen, opt => opt.MapFrom(_ => DateTime.UtcNow));
}