trakqr/src/TrackApi/TrackQrApi/Features/Domains/Endpoints/DeleteDomainEndpoint.cs

using System.Security.Claims;
using FastEndpoints;
using Microsoft.EntityFrameworkCore;
using TrackQrApi.Data;
using TrackQrApi.Features.Auth.Common;

namespace TrackQrApi.Features.Domains.Endpoints;

public class DeleteDomainRequest
{
    public Guid WorkspaceId { get; set; }
    public Guid Id { get; set; }
}

public class DeleteDomainEndpoint(AppDbContext db)
    : Endpoint<DeleteDomainRequest>
{
    public override void Configure()
    {
        Delete("/workspaces/{WorkspaceId}/domains/{Id}");
    }

    public override async Task HandleAsync(DeleteDomainRequest req, CancellationToken ct)
    {
        var userId = Guid.Parse(User.FindFirstValue(ClaimTypes.NameIdentifier)!);

        var domain = await db.Domains
            .Include(d => d.Workspace)
            .FirstOrDefaultAsync(
                d => d.Id == req.Id && d.WorkspaceId == req.WorkspaceId && d.Workspace.OwnerUserId == userId, ct);

        if (domain is null)
        {
            await HttpContext.Response.SendAsync(new MessageResponse("Domain not found"), 404, cancellation: ct);
            return;
        }

        // Check if any links are using this domain
        var linksUsingDomain = await db.ShortLinks
            .AnyAsync(l => l.DomainId == domain.Id, ct);

        if (linksUsingDomain)
        {
            await HttpContext.Response.SendAsync(
                new MessageResponse("Cannot delete domain: it has associated short links"),
                400,
                cancellation: ct);
            return;
        }

        db.Domains.Remove(domain);
        await db.SaveChangesAsync(ct);

        await HttpContext.Response.SendAsync(new MessageResponse("Domain deleted"), cancellation: ct);
    }
}