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

namespace TravelAgencyBusinessLogic.BusinessLogics
{
    public class ExcursionLogic : IExcursionLogic
    {
        private readonly ILogger _logger;

        private readonly IExcursionStorage _excursionStorage;

        public ExcursionLogic(ILogger<ExcursionLogic> logger, IExcursionStorage excursionStorage)
        {
            _logger = logger;
            _excursionStorage = excursionStorage;
        }

        public List<ExcursionViewModel>? ReadList(ExcursionSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id: {Id}, ExcursionName: {ExcursionName}, UserId: {UserId}.", model?.Id, model?.ExcursionName, model?.UserId);
            var list = (model == null) ? _excursionStorage.GetFullList() : _excursionStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public ExcursionViewModel? ReadElement(ExcursionSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Excursion id: {Id}, Excursion name: {ExcursionName}", model?.Id, model?.ExcursionName);
            var element = _excursionStorage.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(ExcursionBindingModel model)
        {
            CheckModel(model);
            if (_excursionStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

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

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

        private void CheckModel(ExcursionBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ExcursionName))
            {
                throw new ArgumentNullException("Нет названия экскурсии", nameof(model.ExcursionName));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Цена экскурсии должна быть больше 0", nameof(model.Price));
            }
            if (model.UserId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор пользователя", nameof(model.UserId));
            }
            _logger.LogInformation("Excursion. Id: {id}, ExcursionName: {ExcursionName}, Price: {Price}, UserId: {UserId}", model.Id, model.ExcursionName, model.Price, model.UserId);
            var element = _excursionStorage.GetElement(new ExcursionSearchModel
            {
                ExcursionName = model.ExcursionName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Экскурсия с таким названием уже есть");
            }
        }
    }
}