using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Threading.Tasks;
using VeterinaryClinicContracts.BindingModels;
using VeterinaryClinicContracts.SearchModels;
using VeterinaryClinicContracts.StorageContracts;
using VeterinaryClinicContracts.ViewModels;
using VeterinaryClinicDatabaseImplement.Models;

namespace VeterinaryClinicDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            var element = context.Orders.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                var deletedElement = context.Orders
                    .Include(x => x.Medicine)
                    .Include(x => x.Client)
                    .FirstOrDefault(x => x.Id == model.Id)
                    ?.GetViewModel;
                context.Orders.Remove(element);
                context.SaveChanges();
                return deletedElement;
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new VeterinaryClinicDatabase();
            return context.Orders
            .Include(x => x.Medicine)
            .Include(x => x.Client)
            .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
            ?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue && !model.DateFrom.HasValue && !model.DateTo.HasValue && !model.ClientId.HasValue)
                return new();
            using var context = new VeterinaryClinicDatabase();
            if (!model.Id.HasValue && model.DateFrom.HasValue && model.DateTo.HasValue)
            {
                return context.Orders
                              .Include(x => x.Medicine)
                              .Include(x => x.Client)
                              .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo)
                              .Select(x => x.GetViewModel)
                              .ToList();
            }
            else if (model.ClientId.HasValue)
                return context.Orders
                    .Include(x => x.Medicine)
                    .Include(x => x.Client)
                    .Where(x => x.ClientId == model.ClientId)
                    .Select(x => x.GetViewModel)
                    .ToList();
            return context.Orders
            .Include(x => x.Medicine)
            .Include(x => x.Client)
            .Where(x => x.Id == model.Id)
           .Select(x => x.GetViewModel)
           .ToList();
        }

        public List<OrderViewModel> GetFullList()
        {
            using var context = new VeterinaryClinicDatabase();
            return context.Orders
            .Include(x => x.Medicine)
            .Include(x => x.Client)
            .Select(x => x.GetViewModel)
           .ToList();
        }

        public OrderViewModel? Insert(OrderBindingModel model)
        {
            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            using var context = new VeterinaryClinicDatabase();
            context.Orders.Add(newOrder);
            context.SaveChanges();
            return context.Orders
                .Include(x => x.Medicine)
                .Include(x => x.Client)
                .FirstOrDefault(x => x.Id == newOrder.Id)
                 ?.GetViewModel;
        }

        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new VeterinaryClinicDatabase();
            var order = context.Orders.FirstOrDefault(x => x.Id ==
           model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return context.Orders
                .Include(x => x.Medicine)
                .Include(x => x.Client)
                .FirstOrDefault(x => x.Id == model.Id)
                 ?.GetViewModel;
        }
    }
}