using FastEndpoints;
using MetaCourse.Api.Data;
using Microsoft.EntityFrameworkCore;

namespace MetaCourse.Api.Endpoints.Courses;

public class DeleteCourseRequest
{
    public Guid Id { get; set; }
}

public class DeleteCourseEndpoint(AppDbContext db) : Endpoint<DeleteCourseRequest>
{
    public override void Configure()
    {
        Delete("api/courses/{id}");
        AllowAnonymous();
        Summary(s => s.Summary = "Supprime un cours (uniquement si brouillon sans inscriptions)");
    }

    public override async Task HandleAsync(DeleteCourseRequest req, CancellationToken ct)
    {
        var course = await db.Courses
            .Include(c => c.UserCourses)
            .FirstOrDefaultAsync(c => c.Id == req.Id, ct);

        if (course is null)
        {
            await SendNotFoundAsync(ct);
            return;
        }

        if (course.UserCourses.Any())
        {
            AddError("Impossible de supprimer un cours auquel des utilisateurs sont inscrits.");
            await SendErrorsAsync(409, ct);
            return;
        }

        db.Courses.Remove(course);
        await db.SaveChangesAsync(ct);
        await SendNoContentAsync(ct);
    }
}