using ElectronicsShopContracts.BindingModels;
using ElectronicsShopContracts.SearchModels;
using ElectronicsShopContracts.StorageContracts;
using ElectronicsShopContracts.ViewModels;
using ElectronicsShopDataBaseImplement.Models;


namespace ElectronicsShopDataBaseImplement.Implements
{
    public class EmployeeStorage : IEmployeeStorage
    {
		public EmployeeViewModel? Insert(EmployeeBindingModel model) {
			var newComponent = Employee.Create(model);
			if (newComponent == null) {
				return null;
			}
			using var context = new Database();
			context.Employees.Add(newComponent);
			context.SaveChanges();
			return newComponent.GetViewModel;
		}

		public EmployeeViewModel? Update(EmployeeBindingModel model) {
			using var context = new Database();
			var component = context.Employees.FirstOrDefault(x => x.ID == model.ID);
			if (component == null) {
				return null;
			}
			component.Update(model);
			context.SaveChanges();
			return component.GetViewModel;
		}

		public EmployeeViewModel? Delete(EmployeeBindingModel model)
        {
            using var context = new Database();
            var element = context.Employees.FirstOrDefault(rec => rec.ID == model.ID);
            if (element != null)
            {
                context.Employees.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public EmployeeViewModel? GetElement(EmployeeSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login) && !model.ID.HasValue)
            {
                return null;
            }
            using var context = new Database();
            return context.Employees
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Login) && 
                x.EmployeeFIO == model.EmployeFIO ||
                 (model.ID.HasValue && x.ID == model.ID)))?.GetViewModel;
        }

		public List<EmployeeViewModel> GetFilteredList(EmployeeSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login))
            {
                return new();
            }
            using var context = new Database();
            return context.Employees.Where(x => x.Login
                                    .Contains(model.Login))
                                    .Select(x => x.GetViewModel).ToList();
        }

        public List<EmployeeViewModel> GetFullList()
        {
            using var context = new Database();
            return context.Employees.Select(x => x.GetViewModel).ToList();
        }
    }
}