using HospitalContracts.BindingModels;
using HospitalContracts.BusinessLogicContracts;
using HospitalContracts.SearchModels;
using HospitalContracts.StorageContracts;
using HospitalContracts.ViewModels;
using Microsoft.Extensions.Logging;

namespace HospitalBusinessLogic
{
    public class MedicineLogic : IMedicineLogic
    {
        private readonly ILogger _logger;
        private readonly IMedicineStorage _medicineStorage;

        public MedicineLogic(ILogger<MedicineLogic> logger, IMedicineStorage medicineStorage)
        {
            _logger = logger;
            _medicineStorage = medicineStorage;
        }

        public MedicineViewModel? ReadElement(MedicineSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Name: {Name}. Id:{ Id}", model.Name, 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 List<MedicineViewModel>? ReadList(MedicineSearchModel? model)
        {
            _logger.LogInformation("ReadList. Name: {Name}. Id:{ Id}", model?.Name, 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 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;
        }

        public bool Update(MedicineBindingModel model)
        {
            CheckModel(model);
            if (_medicineStorage.Update(model) == null)
            {
                _logger.LogWarning("Update 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.Name))
            {
                throw new ArgumentNullException("Нет названия лекарства",
               nameof(model.Name));
            }
            if (model.Cost <= 0)
            {
                throw new ArgumentNullException("Стоимость лекарства должна быть больше 0",
               nameof(model.Cost));
            }
            if (string.IsNullOrEmpty(model.Dose))
            {
                throw new ArgumentNullException("Нет дозировки лекарства",
               nameof(model.Dose));
            }
            _logger.LogInformation("Medicine. Name:{ Name}. Cost: {Cost}. Dose: {Dose}. Id: { Id}", model.Name, model.Cost, model.Dose, model.Id);      
        }
    }
}