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.Campus.Commands.CreateCampus;

public class CreateCampusCommandHandler(ICampusDbContext dbContext) : IRequestHandler<CreateCampusCommand, int>
{
    public async Task<int> Handle(CreateCampusCommand request, CancellationToken cancellationToken)
    {
        var entity = await dbContext.Campuses.FirstOrDefaultAsync(c => c.CodeName == request.CodeName, cancellationToken: cancellationToken);

        if (entity != null)
            throw new RecordExistException(typeof(Domain.Schedule.Campus), nameof(Domain.Schedule.Campus.CodeName), entity.Id);

        var campus = new Domain.Schedule.Campus()
        {
            CodeName = request.CodeName,
            FullName = request.FullName,
            Address = request.Address
        };

        var result = await dbContext.Campuses.AddAsync(campus, cancellationToken);
        await dbContext.SaveChangesAsync(cancellationToken);

        return result.Entity.Id;
    }
}