PIbd-31_Yakovlev.M.G._COP_16/ComponentProgramming/DatabaseImplement/Implements/ProviderStorage.cs

using Contracts.BindingModels;
using Contracts.SearchModels;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using DatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
    public class ProviderStorage : IProviderStorage
    {
        public List<ProviderViewModel> GetFullList()
        {
            using var context = new Database();
            return context.Providers.Select(x => x.GetViewModel).ToList();
        }

        public List<ProviderViewModel> GetFilteredList(ProviderSearchModel model)
        {
            if (string.IsNullOrEmpty(model.OrganisationType))
            {
                return new();
            } 
            using var context = new Database();
            return context.Providers.Where(x => x.OrganisationType == model.OrganisationType).Select(x=> x.GetViewModel).ToList();
        } 

        public ProviderViewModel? GetElement(ProviderSearchModel model)
        {
            if(!model.Id.HasValue)
            {
                return null;
            }
            using var context = new Database();
            return context.Providers.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public ProviderViewModel? Insert(ProviderBindingModel model)
        {
            var newProvider = Provider.Create(model);
            if (newProvider == null) return null;
            using var context = new Database();
            context.Providers.Add(newProvider);
            context.SaveChanges();
            return newProvider.GetViewModel;
        }

        public ProviderViewModel? Update(ProviderBindingModel model)
        {
            using var context = new Database();
            var provider = context.Providers.FirstOrDefault(x=> x.Id ==  model.Id);
            if(provider == null) return null;
            provider.Update(model);
            context.SaveChanges();
            return provider.GetViewModel;
        }

        public ProviderViewModel? Delete(ProviderBindingModel model)
        {
            using var context = new Database();
            var element = context.Providers.FirstOrDefault(x=>x.Id == model.Id);
            if(element != null)
            {
                context.Providers.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}