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.StoragesContracts;
using VeterinaryClinicContracts.ViewModels;
using Microsoft.Extensions.Logging;

namespace VeterinaryClinicBusinessLogics.BusinessLogics
{
    public class AnimalLogic : IAnimalLogic
    {
        private readonly ILogger _logger;
        private readonly IAnimalStorage _animalStorage;

        public AnimalLogic(ILogger<AnimalLogic> logger, IAnimalStorage animalStorage)
        {
            _logger = logger;
            _animalStorage = animalStorage;
        }

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

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

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

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

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

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

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

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

        public List<AnimalViewModel>? ReadList(AnimalSearchModel? model)
        {
            _logger.LogInformation("ReadList. Animal.Id: {Id}. UserId: {UserId}", model?.Id, model?.UserId);

            var list = model == null ? _animalStorage.GetFullList() : _animalStorage.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(AnimalBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Update. Animal.Id: {Id}", model.Id);

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

        private void CheckModel(AnimalBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Type))
            {
                throw new ArgumentNullException("Не указан вид животного", nameof(model.Type));
            }
            if (string.IsNullOrEmpty(model.Breed))
            {
                throw new ArgumentNullException("Не указан порода животного", nameof(model.Breed));
            }
            if (model.Age < 0)
            {
                throw new ArgumentNullException("Не указан возраст животного", nameof(model.Age));
            }
            if (model.UserId <= 0)
            {
                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
            }

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