using LawFirmContracts.BindingModels;
using LawFirmContracts.SearchModels;
using LawFirmContracts.StorageContracts;
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 DocumentStorage : IDocumentStorage
    {
        private readonly DataFileSingleton source;

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

        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 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 List<DocumentViewModel> GetFullList()
        {
            return source.Documents.Select(x => x.GetViewModel).ToList();
        }

        public DocumentViewModel? Insert(DocumentBindingModel model)
        {
            model.Id = source.Documents.Count > 0 ? source.Documents.Max(x => x.Id) + 1 : 1;
            var newDoc = Document.Create(model);
            if (newDoc == null)
            {
                return null;
            }
            source.Documents.Add(newDoc);
            source.SaveDocuments();
            return newDoc.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 document = source.Documents.FirstOrDefault(x => x.Id == model.Id);
            if (document == null)
            {
                return null;
            }
            source.Documents.Remove(document);
            source.SaveDocuments();
            return document.GetViewModel;
        }

    }
}