using Microsoft.Extensions.Logging;
using TravelAgencyContracts.BindingModels;
using TravelAgencyContracts.BusinessLogicsContracts;
using TravelAgencyContracts.SearchModels;
using TravelAgencyContracts.StoragesContracts;
using TravelAgencyContracts.ViewModels;

namespace TravelAgencyBusinessLogic.BusinessLogics
{
    public class TripLogic : ITripLogic
    {
        private readonly ILogger _logger;

        private readonly ITripStorage _tripStorage;

        public TripLogic(ILogger<TripLogic> logger, ITripStorage tripStorage)
        {
            _logger = logger;
            _tripStorage = tripStorage;
        }

        public List<TripViewModel>? ReadList(TripSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id: {Id}, TripName: {TripName}, GuideId: {GuideId}.", model?.Id, model?.TripName, model?.GuideId);
            var list = (model == null) ? _tripStorage.GetFullList() : _tripStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public TripViewModel? ReadElement(TripSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Trip id: {Id}, Trip name: {TripName}", model?.Id, model?.TripName);
            var element = _tripStorage.GetElement(model!);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. Id: {Id}", element.Id);
            return element;
        }

        public bool Create(TripBindingModel model)
        {
            CheckModel(model);
            if (_tripStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool Update(TripBindingModel model)
        {
            CheckModel(model);
            if (_tripStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(TripBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_tripStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(TripBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.TripName))
            {
                throw new ArgumentNullException("Нет названия поездки", nameof(model.TripName));
            }
            if (model.TripDate == DateTime.MinValue)
            {
                throw new ArgumentNullException("Нет даты поездки", nameof(model.TripDate));
            }
            if (model.GuideId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор гида", nameof(model.GuideId));
            }
            _logger.LogInformation("Trip. Id: {id}, TripName: {TripName}, GuideId: {GuideId}", model.Id, model.TripName, model.GuideId);
            var element = _tripStorage.GetElement(new TripSearchModel
            {
                TripName = model.TripName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Поездка с таким названием уже есть");
            }
        }
    }
}