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

namespace VeterinaryClinicBusinessLogic.BusinessLogics
{
    public class MedicineLogic : IMedicineLogic
    {
        private readonly ILogger _logger;
        private readonly IMedicineStorage _MedicineStorage;
        public MedicineLogic(ILogger<MedicineLogic> logger, IMedicineStorage MedicineStorage)
        {
            _logger = logger;
            _MedicineStorage = MedicineStorage;
        }
        public List<MedicineViewModel>? ReadList(MedicineSearchModel? model)
        {
            _logger.LogInformation("ReadList. MedicineName:{MedicineName}.Id:{ Id}", model?.MedicineName, model?.Id);
            var list = model == null ? _MedicineStorage.GetFullList() : _MedicineStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        public MedicineViewModel? ReadElement(MedicineSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. MedicineName:{MedicineName}.Id:{ Id}", model.MedicineName, model.Id);
            var element = _MedicineStorage.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 Update(MedicineBindingModel model)
        {
            CheckModel(model);
            if (_MedicineStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Create(MedicineBindingModel model)
        {
            CheckModel(model);
            if (_MedicineStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

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

        private void CheckModel(MedicineBindingModel model, bool withParams =
       true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.MedicineName))
            {
                throw new ArgumentNullException("Нет названия компонента",
               nameof(model.MedicineName));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Цена изделия должна быть больше 0", nameof(model.Price));
            }
            _logger.LogInformation("Medicine. MedicineName:{MedicineName}. Cost:{Cost}. Id: {Id}", model.MedicineName, model.Price, model.Id);
            var element = _MedicineStorage.GetElement(new MedicineSearchModel
            {
                MedicineName = model.MedicineName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Изделие с таким названием уже есть");
            }
        }
    }
}