using FastEndpoints;
using MetaCourse.Api.Data;
using MetaCourse.Api.DTOs.Courses;
using MetaCourse.Api.Entities;
using Microsoft.EntityFrameworkCore;

namespace MetaCourse.Api.Endpoints.Courses;

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

public class PublishCourseEndpoint(AppDbContext db) : Endpoint<PublishCourseRequest, GetCourseDto>
{
    public override void Configure()
    {
        Patch("api/courses/{id}/publish");
        AllowAnonymous();
        Summary(s => s.Summary = "Publie un cours (le rend visible dans le catalogue)");
    }

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

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

        if (!course.Topics.Any())
        {
            AddError("Un cours doit avoir au moins un sujet pour être publié.");
            await SendErrorsAsync(422, ct);
            return;
        }

        course.Status = CourseStatus.Published;
        course.UpdatedAt = DateTime.UtcNow;
        await db.SaveChangesAsync(ct);

        await SendOkAsync(new GetCourseDto
        {
            Id = course.Id,
            Title = course.Title,
            Description = course.Description,
            Status = course.Status.ToString(),
            CreatorId = course.CreatorId,
            CreatorName = course.Creator.Name,
            TopicCount = course.Topics.Count,
            CreatedAt = course.CreatedAt,
            UpdatedAt = course.UpdatedAt
        }, ct);
    }
}