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


namespace BarDatabaseImplement.Implements
{
    public class CocktailStorage : ICocktailStorage
    {
        public List<CocktailViewModel> GetFullList()
        {
            using var context = new BarDatabase();
            return context.Cocktails.Include(x => x.Components).ThenInclude(x => x.Component).ToList().Select(x => x.GetViewModel).ToList();
        }
        public List<CocktailViewModel> GetFilteredList(CocktailSearchModel model)
        {
            if (string.IsNullOrEmpty(model.CocktailName))
            {
                return new();
            }
            using var context = new BarDatabase();
            return context.Cocktails.Include(x => x.Components).ThenInclude(x => x.Component).Where(x => x.CocktailName.Contains(model.CocktailName)).ToList().Select(x => x.GetViewModel).ToList();

        }
        public CocktailViewModel? GetElement(CocktailSearchModel model)
        {
            if (string.IsNullOrEmpty(model.CocktailName) &&
            !model.Id.HasValue)
            {
                return null;
            }
            using var context = new BarDatabase();
            return context.Cocktails.Include(x => x.Components).ThenInclude(x => x.Component)
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.CocktailName) && x.CocktailName == model.CocktailName) || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }
        public CocktailViewModel? Insert(CocktailBindingModel model)
        {
            using var context = new BarDatabase();
            var newCocktail = Cocktail.Create(context, model);
            if (newCocktail == null)
            {
                return null;
            }
            context.Cocktails.Add(newCocktail);
            context.SaveChanges();
            return newCocktail.GetViewModel;
        }
        public CocktailViewModel? Update(CocktailBindingModel model)
        {
            using var context = new BarDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var cocktail = context.Cocktails.FirstOrDefault(rec =>
                rec.Id == model.Id);
                if (cocktail == null)
                {
                    return null;
                }
                cocktail.Update(model);
                context.SaveChanges();
                cocktail.UpdateComponents(context, model);
                transaction.Commit();
                return cocktail.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
        public CocktailViewModel? Delete(CocktailBindingModel model)
        {
            using var context = new BarDatabase();
            var element = context.Cocktails
            .Include(x => x.Components)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Cocktails.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}