using BlogContracts.BindingModel;
using BlogContracts.SearchModels;
using BlogContracts.StorageContracts;
using BlogContracts.ViewModels;
using BlogDatabaseImplement.Model;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BlogDatabaseImplement.Implements
{
    public class NewsStorage : INewsStorage
    {
        public NewsViewModel? Delete(NewsBindingModel model)
        {
            using var context = new BlogDatabase();
            var element = context.News.FirstOrDefault(rec => rec.Id ==
            model.Id);

            if (element != null)
            {
                context.News.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;

        }

        public NewsViewModel? GetElement(NewsSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Title) &&
            !model.Id.HasValue)
            {
                return null;
            }
            using var context = new BlogDatabase();
            return context.News
             .Include(x => x.Tags)
             .ThenInclude(x => x.Tag)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Title) &&
            x.Title == model.Title) ||
            (model.Id.HasValue && x.Id ==
            model.Id))
            ?.GetViewModel;
        }

        public List<NewsViewModel> GetFilteredList(NewsSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Title))
            {
                return new();
            }
            using var context = new BlogDatabase();
            return context.News
            .Include(x => x.Tags)
            .ThenInclude(x => x.Tag)
            .Where(x => x.Title.Contains(model.Title))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public List<NewsViewModel> GetFullList()
        {
            using var context = new BlogDatabase();
            return context.News
            .Include(x => x.User)
            .Include(x => x.Tags)
            .ThenInclude(x => x.Tag)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }

        public NewsViewModel? Insert(NewsBindingModel model)
        {
            using var context = new BlogDatabase();
            var newNews = News.Create(context, model);
            if (newNews == null)
            {
                return null;
            }
            context.News.Add(newNews);
            context.SaveChanges();
            return newNews.GetViewModel;
        }

        public NewsViewModel? Update(NewsBindingModel model)
        {
            using var context = new BlogDatabase();
            var element = context.News
                .FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            element.Update(model);
            context.SaveChanges();
            return element.GetViewModel;
        }
    }
}