using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using VeterinaryClinicContracts.BindingModels;
using VeterinaryClinicContracts.BusinessLogicsContracts;
using VeterinaryClinicContracts.SearchModels;
using VeterinaryClinicContracts.ViewModels;
using Microsoft.Extensions.Logging;
using VeterinaryClinicContracts.StoragesContracts;

namespace VeterinaryClinicBusinessLogics.BusinessLogics
{
    public class VaccinationLogic : IVaccinationLogic
    {
        private readonly ILogger _logger;
        private readonly IVaccinationStorage _vaccinationStorage;

        public VaccinationLogic(ILogger<VaccinationLogic> logger, IVaccinationStorage vaccinationStorage)
        {
            _logger = logger;
            _vaccinationStorage = vaccinationStorage;
        }

        public bool Create(VaccinationBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Create. Vaccination.Id: {Id}", model.Id);

            if (_vaccinationStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(VaccinationBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Vaccination.Id: {Id}", model.Id);

            if (_vaccinationStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }

        public VaccinationViewModel? ReadElement(VaccinationSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            _logger.LogInformation("ReadElement. Vaccination.Id: {Id}.", model?.Id);

            var element = _vaccinationStorage.GetElement(model!);
            if (element == null)
            {
                _logger.LogWarning("ReadElement. Element not found");
                return null;
            }

            _logger.LogInformation("ReadElement. Find Vaccination.Id: {Id}", element?.Id);
            return element;
        }

        public List<VaccinationViewModel>? ReadList(VaccinationSearchModel? model)
        {
            _logger.LogInformation("ReadList. Vaccination.Id: {Id}. Name: {Name}", model?.Id, model?.Name);

            var list = model == null ? _vaccinationStorage.GetFullList() : _vaccinationStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList. Returned null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public bool Update(VaccinationBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Update. Vaccination.Id: {Id}", model.Id);

            if (_vaccinationStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(VaccinationBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Не указано названия прививки", nameof(model.Name));
            }
            if (model.DateInjection == DateTime.MinValue)
            {
                throw new ArgumentNullException("Не указана дата укола", nameof(model.DateInjection));
            }
            if (string.IsNullOrEmpty(model.ValidityPeriod))
            {
                throw new ArgumentNullException("Не указан срок действия", nameof(model.ValidityPeriod));
            }
            if (model.UserId <= 0)
            {
                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
            }
            if (model.AnimalId <= 0)
            {
                throw new ArgumentNullException("Не указан идентификатор животного", nameof(model.AnimalId));
            }

            _logger.LogInformation("CheckModel. Vaccination.Id: {Id}", model.Id);

            var element = _vaccinationStorage.GetElement(new VaccinationSearchModel
            {
                Name = model.Name
            });
            if (element != null && !element.Id.Equals(model.Id))
            {
                throw new InvalidOperationException("Прививка с таким названием уже существует");
            }
        }
    }
}