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

namespace FurnitureAssemblyDatabaseImplement.Implements
{
    public class ImplementerStorage : IImplementerStorage
    {
        public ImplementerViewModel? GetElement(ImplementerSearchModel model)
        {
            using var context = new FurnitureAssemblyDatabase();

            if (model.Id.HasValue)
            {
                return context.Implementers
                .Include(x => x.Order)
                .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
                ?.GetViewModel;
            }
            else if (!string.IsNullOrEmpty(model.ImplementerFIO) && !string.IsNullOrEmpty(model.Password))
            {
                return context.Implementers
                    .Include(x => x.Order)
                    .FirstOrDefault(x => (x.ImplementerFIO == model.ImplementerFIO && x.Password == model.Password))
                    ?.GetViewModel;
            }

            return new();
        }

        public List<ImplementerViewModel> GetFullList()
        {
            using var context = new FurnitureAssemblyDatabase();

            return context.Implementers
                .Include(x => x.Order)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ImplementerFIO))
            {
                return new();
            }

            using var context = new FurnitureAssemblyDatabase();

            return context.Implementers
                .Include(x => x.Order)
                .Where(x => x.ImplementerFIO.Contains(model.ImplementerFIO))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public ImplementerViewModel? Insert(ImplementerBindingModel model)
        {
            var newImplementer = Implementer.Create(model);

            if (newImplementer == null)
            {
                return null;
            }

            using var context = new FurnitureAssemblyDatabase();

            context.Implementers.Add(newImplementer);
            context.SaveChanges();

            return context.Implementers
                .Include(x => x.Order)
                .FirstOrDefault(x => x.Id == newImplementer.Id)
                ?.GetViewModel;
        }

        public ImplementerViewModel? Update(ImplementerBindingModel model)
        {
            using var context = new FurnitureAssemblyDatabase();

            var order = context.Implementers
                .Include(x => x.Order)
                .FirstOrDefault(x => x.Id == model.Id);

            if (order == null)
            {
                return null;
            }

            order.Update(model);
            context.SaveChanges();

            return context.Implementers
                .Include(x => x.Order)
                .FirstOrDefault(x => x.Id == model.Id)
                ?.GetViewModel;
        }

        public ImplementerViewModel? Delete(ImplementerBindingModel model)
        {
            using var context = new FurnitureAssemblyDatabase();

            var element = context.Implementers
                .FirstOrDefault(rec => rec.Id == model.Id);

            if (element != null)
            {
                // для отображения КОРРЕКТНОЙ ViewModel-и
                var deletedElement = context.Implementers
                    .Include(x => x.Order)
                    .FirstOrDefault(x => x.Id == model.Id)
                    ?.GetViewModel;

                context.Implementers.Remove(element);
                context.SaveChanges();

                return deletedElement;
            }

            return null;
        }
    }
}