using MediatR;
using Microsoft.EntityFrameworkCore;
using Mirea.Api.DataAccess.Application.Common.Exceptions;
using Mirea.Api.DataAccess.Application.Interfaces.DbContexts.Schedule;
using System.Threading;
using System.Threading.Tasks;

namespace Mirea.Api.DataAccess.Application.Cqrs.Group
    .Queries.GetGroupDetails;

public class GetGroupInfoQueryHandler(IGroupDbContext dbContext) : IRequestHandler<GetGroupInfoQuery, GroupInfoVm>
{
    public async Task<GroupInfoVm> Handle(GetGroupInfoQuery request, CancellationToken cancellationToken)
    {
        var discipline = await dbContext.Groups
            .Include(g => g.Faculty)
            .FirstOrDefaultAsync(g => g.Id == request.Id, cancellationToken)
                         ?? throw new NotFoundException(typeof(Domain.Schedule.Group), request.Id);

        return new GroupInfoVm()
        {
            Id = discipline.Id,
            Name = discipline.Name,
            Faculty = discipline.Faculty?.Name,
            FacultyId = discipline.FacultyId
        };
    }
}