using Diligent.WebAPI.Contracts.DTOs.Applicant;

namespace Diligent.WebAPI.Business.Services
{
    public class ApplicantService : IApplicantService
    {
        private readonly DatabaseContext _context;
        private readonly IMapper _mapper;

        public ApplicantService(DatabaseContext context,IMapper mapper)
        {
            _context = context;
            _mapper = mapper;
        }

        public async Task<List<ApplicantViewDto>> GetAll()
        {
            var applicants = await _context.Applicants.Include(c => c.Ads).ToListAsync();
            return _mapper.Map<List<ApplicantViewDto>>(applicants);
        }

        public async Task<ApplicantViewDto> GetById(int id)
        {
            var applicant = await _context.Applicants
                .Include(x => x.Ads)
                .ThenInclude(x => x.Technologies)
                .Include(x => x.TechnologyApplicants)
                .ThenInclude(x => x.Technology)
                .Include(x => x.Comments)
                .ThenInclude(t => t.User)
                .FirstOrDefaultAsync(x => x.ApplicantId == id);

            if (applicant is null)
                throw new EntityNotFoundException("Applicant not found");

            return _mapper.Map<ApplicantViewDto>(applicant);
        }
        public async Task<ApplicantViewDto> GetApplicantWithSelectionProcessesById(int id)
        {
            var applicant = await _context.Applicants
                .Include(a => a.SelectionProcesses).ThenInclude(sp => sp.SelectionLevel)
                .FirstOrDefaultAsync(a => a.ApplicantId == id);

            if (applicant is null)
                throw new EntityNotFoundException("Applicant not found");

            return _mapper.Map<ApplicantViewDto>(applicant);
        }
        public async Task CreateApplicant(ApplicantCreateDto applicantCreateDto)
        {
            var applicant = _mapper.Map<Applicant>(applicantCreateDto);
            await _context.Applicants.AddAsync(applicant);

            await _context.SaveChangesAsync();
        }

        public async Task DeleteApplicant(int id)
        {
            var applicant = await _context.Applicants.FindAsync(id);

            if(applicant is null)
                throw new EntityNotFoundException("Applicant not found");

            _context.Applicants.Remove(applicant);
            await _context.SaveChangesAsync();
        }

        public async Task UpdateApplicant(int id, ApplicantUpdateDto applicantUpdateDto)
        {
            var applicant = await _context.Applicants.FindAsync(id);
            if (applicant is null)
                throw new EntityNotFoundException("Applicant not found");

            _mapper.Map(applicantUpdateDto, applicant);

            _context.Entry(applicant).State = EntityState.Modified;
            await _context.SaveChangesAsync();
        }
    }
}