using MediatR;
using Microsoft.AspNetCore.Http;
using SequenceAuth.Lib;

namespace SequenceAuth.Example.Features.Auth;

public record LogoutCommand() : IRequest;

public class LogoutCommandHandler(ISequenceStore sequenceStore, IHttpContextAccessor httpContextAccessor, Microsoft.Extensions.Options.IOptions<SequenceAuthOptions> options) : IRequestHandler<LogoutCommand>
{
    public async Task Handle(LogoutCommand request, CancellationToken cancellationToken)
    {
        var userIdStr = httpContextAccessor.HttpContext?.Items[options.Value.UserIdItemKey]?.ToString();
        var isUserIdPresent = string.IsNullOrEmpty(userIdStr);
        
        _ = isUserIdPresent switch
        {
            false => await ProcessLogout(userIdStr!),
            true => 0
        };
    }

    private async Task<int> ProcessLogout(string userId)
    {
        await sequenceStore.InvalidateUserSessionsAsync(userId);
        return 1;
    }
}