using AutoMapper;
using FastEndpoints;
using MetaCourse.Api.Data;
using MetaCourse.Api.DTOs.Topics;
using MetaCourse.Api.Entities;
using Microsoft.EntityFrameworkCore;

namespace MetaCourse.Api.Endpoints.Topics;

public class CreateTopicEndpoint(AppDbContext db, AutoMapper.IMapper mapper) : Endpoint<CreateTopicDto, GetTopicDto>
{
    public override void Configure()
    {
        Post("api/topics");
        AllowAnonymous();
        Summary(s => s.Summary = "Ajoute un sujet à un cours");
    }

    public override async Task HandleAsync(CreateTopicDto req, CancellationToken ct)
    {
        var courseExists = await db.Courses.AnyAsync(c => c.Id == req.CourseId, ct);
        if (!courseExists)
        {
            AddError(r => r.CourseId, "Le cours n'existe pas.");
            await SendErrorsAsync(404, ct);
            return;
        }

        var topic = mapper.Map<Topic>(req);
        db.Topics.Add(topic);
        await db.SaveChangesAsync(ct);

        await SendAsync(mapper.Map<GetTopicDto>(topic), 201, ct);
    }
}