PIbd-23_Leonteva_V._A._LawFirm/LawFirm/LawFirmFileImplement/Implements/DocumentStorage.cs

using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StoragesContracts;
using LawFirmContracts.ViewModels;
using LawFirmFileImplement.Models;

namespace LawFirmFileImplement.Implements
{
    public class DocumentStorage : IDocumentStorage
    {
        private readonly DataFileSingleton source;
        public DocumentStorage()
        {
            source = DataFileSingleton.GetInstance();
        }
        public List<DocumentViewModel> GetFullList()
        {
            return source.Documents.Select(x => x.GetViewModel).ToList();
        }
        public List<DocumentViewModel> GetFilteredList(DocumentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DocumentName))
            {
                return new();
            }
            return source.Documents.Where(x =>
                x.DocumentName.Contains(model.DocumentName)).Select(x => x.GetViewModel).ToList();
        }
        public DocumentViewModel? GetElement(DocumentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.DocumentName) && !model.Id.HasValue)
            {
                return null;
            }
            return source.Documents.FirstOrDefault(x =>
                (!string.IsNullOrEmpty(model.DocumentName) && x.DocumentName ==
                model.DocumentName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        public DocumentViewModel? Insert(DocumentBindingModel model)
        {
            model.Id = source.Documents.Count > 0 ? source.Documents.Max(x => x.Id) + 1 : 1;
            var newDocument = Document.Create(model);
            if (newDocument == null)
            {
                return null;
            }
            source.Documents.Add(newDocument);
            source.SaveDocuments();
            return newDocument.GetViewModel;
        }
        public DocumentViewModel? Update(DocumentBindingModel model)
        {
            var document = source.Documents.FirstOrDefault(x => x.Id == model.Id);
            if (document == null)
            {
                return null;
            }
            document.Update(model);
            source.SaveDocuments();
            return document.GetViewModel;
        }
        public DocumentViewModel? Delete(DocumentBindingModel model)
        {
            var element = source.Documents.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                source.Documents.Remove(element);
                source.SaveDocuments();
                return element.GetViewModel;
            }
            return null;
        }
    }
}