ISEbd-21_Zinovev_V.V._FurnitureAssembly/FurnitureAssembly/FurnitureAssemblyFileImplement/Implements/ImplementerStorage.cs

using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyFileImplement.Implements
{
    public class ImplementerStorage : IImplementerStorage
    {
        private readonly DataFileSingleton source;
        public ImplementerStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public ImplementerViewModel? GetElement(ImplementerSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ImplementerFIO) && !model.Id.HasValue && string.IsNullOrEmpty(model.Password))
            {
                return null;
            }

            if (model.Id.HasValue)
            {
                return source.Implementers
                    .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
            }

            if (model.ImplementerFIO != null && model.Password != null)
            {
                return source.Implementers
                .FirstOrDefault(x =>
                x.ImplementerFIO.Equals(model.ImplementerFIO) && x.Password.Equals(model.Password))
                ?.GetViewModel;
            }
            return source.Implementers
                .FirstOrDefault(x =>
                x.ImplementerFIO.Equals(model.ImplementerFIO))
                ?.GetViewModel;
        }

        public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ImplementerFIO))
            {
                return new();
            }
            return source.Implementers
            .Where(x => x.ImplementerFIO.Equals(model.ImplementerFIO))
           .Select(x => x.GetViewModel)
           .ToList();
        }

        public List<ImplementerViewModel> GetFullList()
        {
            return source.Implementers
            .Select(x => x.GetViewModel)
           .ToList();
        }

        public ImplementerViewModel? Insert(ImplementerBindingModel model)
        {
            model.Id = source.Implementers.Count > 0 ? source.Implementers.Max(x => x.Id) + 1 : 1;
            var newImpl = Implementer.Create(model);
            if (newImpl == null)
            {
                return null;
            }
            source.Implementers.Add(newImpl);
            source.SaveWorkpieces();
            return newImpl.GetViewModel;
        }

        public ImplementerViewModel? Update(ImplementerBindingModel model)
        {
            var implementer = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
            if (implementer == null)
            {
                return null;
            }
            implementer.Update(model);
            source.SaveWorkpieces();
            return implementer.GetViewModel;
        }

        public ImplementerViewModel? Delete(ImplementerBindingModel model)
        {
            var element = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Implementers.Remove(element);
                source.SaveWorkpieces();
                return element.GetViewModel;
            }
            return null;
        }
    }
}