namespace Diligent.WebAPI.Business.Services
{
    public class SelectionLevelService : ISelectionLevelService
    {
        private readonly DatabaseContext _context;
        private readonly IMapper _mapper;
        private readonly ILogger<SelectionLevelService> _logger;

        public SelectionLevelService(DatabaseContext context, IMapper mapper, ILogger<SelectionLevelService> logger)
        {
            _context = context;
            _mapper = mapper;
            _logger = logger;
        }

        public async Task<List<SelectionLevelResponseWithDataDto>> GetAllAsync()
        {
            _logger.LogInformation("Start getting all selection levels");
            _logger.LogInformation("Getting data from DB");
            var fromDb = await _context.SelectionLevels
                .Include(sl => sl.SelectionProcesses)
                .ThenInclude(sp => sp.Applicant)
                .ToListAsync();

            _logger.LogInformation($"Received {fromDb.Count} levels from db.");
            _logger.LogInformation($"Mapping received ads to SelectionLevelResponseWithDataDto");
            var result = _mapper.Map<List<SelectionLevelResponseWithDataDto>>(fromDb);
            _logger.LogInformation($"Levels has been mapped and received to client: {result.Count} mapped levels");

            return result;
        }
        public async Task<SelectionLevelResposneDto> GetByIdAsync(int id)
        {
            _logger.LogInformation($"Start searching Level with id = {id}");
            var sl = await _context.SelectionLevels.FindAsync(id);

            if (sl is null)
            {
                _logger.LogError($"Level with id = {id} not found");
                throw new EntityNotFoundException("Selection level not found");
            }

            _logger.LogInformation($"Mapping Level with id = {id} to SelectionLevelResposneDto");
            var result = _mapper.Map<SelectionLevelResposneDto>(sl);
            _logger.LogInformation($"Level with id = {id} mapped successfully");
            return result;

        }

        public async Task<SelectionLevel> GetByIdEntity(int id)
        {
            _logger.LogInformation($"Start searching Level with id = {id}");
            var sl = await _context.SelectionLevels.FindAsync(id);

            if (sl is null)
            {
                _logger.LogError($"Level with id = {id} not found");
                throw new EntityNotFoundException("Selection level not found");
            }

            _logger.LogInformation($"Level with id = {id} found and returned to client");
            return sl;
        }

        public List<SelectionLevelResponseWithDataDto> GetFilteredLevelsAsync(SelectionProcessFilterDto filters)
        {
            _logger.LogInformation("Start getting filtered selection levels");
            _logger.LogInformation("Getting data from DB and filter it");
            var filteredLevels = _context.SelectionLevels
                .Include(x => x.SelectionProcesses)
                .ThenInclude(sp => sp.Applicant).ToList()
                .FilterLevels(filters);

            _logger.LogInformation($"Received {filteredLevels.Count} levels from db.");
            _logger.LogInformation($"Mapping received ads to SelectionLevelResponseWithDataDto");
            var result = _mapper.Map<List<SelectionLevelResponseWithDataDto>>(filteredLevels);
            _logger.LogInformation($"Levels has been mapped and received to client: {result.Count} mapped levels");

            return result;
        }
    }
}