ISEbd-21_Chegodaev_A.Y._LawFirm/LawFirm/LawFirmFileImplement/Implements/LawStorage.cs

using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StoragesContracts;
using LawFirmContracts.ViewModels;
using LawFirmFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LawFirmFileImplement.Implements
{
    public class LawStorage : ILawStorage
    {
        private readonly DataFileSingleton source;

        public LawStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

        public LawViewModel? GetElement(LawSearchModel model)
        {
            if (string.IsNullOrEmpty(model.LawName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Laws.FirstOrDefault(x => (!string.IsNullOrEmpty(model.LawName) && x.LawName == model.LawName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        public List<LawViewModel> GetFilteredList(LawSearchModel model)
        {
            if (string.IsNullOrEmpty(model.LawName))
            {
                return new();
            }
            return source.Laws.Where(x => x.LawName.Contains(model.LawName)).Select(x => x.GetViewModel).ToList();
        }

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

        public LawViewModel? Insert(LawBindingModel model)
        {
            model.Id = source.Laws.Count > 0 ? source.Laws.Max(x => x.Id) + 1 : 1;
            var newDoc = Law.Create(model);
            if (newDoc == null)
            {
                return null;
            }
            source.Laws.Add(newDoc);
            source.SaveLaws();
            return newDoc.GetViewModel;
        }

        public LawViewModel? Update(LawBindingModel model)
        {
            var document = source.Laws.FirstOrDefault(x => x.Id == model.Id);
            if (document == null)
            {
                return null;
            }
            document.Update(model);
            source.SaveLaws();
            return document.GetViewModel;
        }
        public LawViewModel? Delete(LawBindingModel model)
        {
            var document = source.Laws.FirstOrDefault(x => x.Id == model.Id);
            if (document == null)
            {
                return null;
            }
            document.Update(model);
            source.SaveLaws();
            return document.GetViewModel;
        }
    }
}