ANTOOZA-BACKEND/Application/Features/Admin/Donation/Alert/Resend/Handler.cs

using Application.Abstractions.Data;
using Application.Abstractions.Messaging;
using Domain.Entities.Donations.ValueObject;
using Microsoft.EntityFrameworkCore;

namespace Application.Features.Admin.Donation.Alert.Resend;

public sealed class Handler(IAppDbContext db) : ICommandHandler<Command>
{
    public async Task Handle(Command request, CancellationToken ct)
    {
        var alert = await db.DonationAlert.FirstOrDefaultAsync(x => x.ID == request.ID, ct)
            ?? throw new InvalidOperationException("후원 알림을 찾을 수 없습니다.");

        if (alert.Status == AlertStatus.Delivered)
        {
            throw new InvalidOperationException("이미 수신된 알림은 재전송할 수 없습니다.");
        }

        // Domain은 Failed/Skipped만 Resend() 허용 — 그 외 상태는 Queued로 재설정
        if (alert.Status is AlertStatus.Failed or AlertStatus.Skipped)
        {
            alert.Resend();
        }
        else
        {
            alert.MarkFailed();
            alert.Resend();
        }

        await db.SaveChangesAsync(ct);
    }
}