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

namespace SushiBarDatabaseImplement.Implements
{
    public class TaskStorage : ITaskStorage
    {
        public void ClearEntity()
        {
            using var context = new SushiBarDatabase();

            string deleteAllQuery = "DELETE FROM \"Tasks\"";
            context.Database.ExecuteSqlRaw(deleteAllQuery);
        }

        public TaskViewModel? Delete(TaskBindingModel model)
        {
            using var context = new SushiBarDatabase();
            var element = context.Tasks.Include(x => x.Menus).FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Tasks.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public TaskViewModel? GetElement(TaskSearchModel model)
        {
            using var context = new SushiBarDatabase();
            return context.Tasks.Include(x => x.Menus).ThenInclude(x => x.Menu).FirstOrDefault(x => (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        public List<TaskViewModel> GetFilteredList(TaskSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }
            using var context = new SushiBarDatabase();
            return context.Tasks.Include(x => x.Menus).ThenInclude(x => x.Menu).Where(x => x.Id == model.Id).ToList().Select(x => x.GetViewModel).ToList();
        }

        public List<TaskViewModel> GetFullList()
        {
            using var context = new SushiBarDatabase();
            return context.Tasks.Include(x => x.Menus).ThenInclude(x => x.Menu).ToList().Select(x => x.GetViewModel).ToList();
        }

        public TaskViewModel? Insert(TaskBindingModel model)
        {
            using var context = new SushiBarDatabase();
            var newTask = Models.Task.Create(context, model);
            if (newTask == null)
            {
                return null;
            }
            context.Tasks.Add(newTask);
            context.SaveChanges();
            return newTask.GetViewModel;
        }

        public TaskViewModel? Update(TaskBindingModel model)
        {
            using var context = new SushiBarDatabase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var task = context.Tasks.FirstOrDefault(x => x.Id == model.Id);
                if (task == null)
                {
                    return null;
                }
                task.Update(model);
                context.SaveChanges();
                //task.UpdateMenus(context, model);
                transaction.Commit();
                return task.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
    }
}