using Microsoft.EntityFrameworkCore;
using SchoolAgainStudyContracts.BindingModel;
using SchoolAgainStudyContracts.SearchModel;
using SchoolAgainStudyContracts.StorageContracts;
using SchoolAgainStudyContracts.ViewModel;
using SchoolAgainStudyDataBaseImplements.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolAgainStudyDataBaseImplements.Implements
{
    public class DiyStorage : IDiyStorage
    {
        public List<DiyViewModel> GetFullList()
        {
            using var context = new SchoolDataBase();
            return context.Diys
                    .Include(x => x.Interests)
                    .ThenInclude(x => x.Interest)
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
        }

        public List<DiyViewModel> GetFilteredList(DiySearchModel model)
        {
            
            if(!model.StudentId.HasValue)
            {
                return new();
            }
            using var context = new SchoolDataBase();
            if(model.DateFrom.HasValue && model.DateTo.HasValue && model.StudentId.HasValue)
            {
                return context.Diys
                   .Include(x => x.Interests)
                   .ThenInclude(x => x.Interest)
                   .Where(x => x.DateCreate >= model.DateFrom && x.DateCreate <= model.DateTo && x.StudentId == model.StudentId)
                   .ToList()
                   .Select(x => x.GetViewModel)
                   .ToList();
            }
           
                return context.Diys
                    .Include(x => x.Interests)
                    .ThenInclude(x => x.Interest)
                    .Where(x => x.StudentId == model.StudentId  )
                    .ToList()
                    .Select(x => x.GetViewModel)
                    .ToList();
            
           
        }

        public DiyViewModel? GetElement(DiySearchModel model)
        {
            if (string.IsNullOrEmpty(model.Title) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new SchoolDataBase();
            return context.Diys
                .Include(x => x.Interests)
                .ThenInclude(x => x.Interest)
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Title) && x.Title == model.Title) ||
                                (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public DiyViewModel? Insert(DiyBindingModel model)
        {
            using var context = new SchoolDataBase();
            var newDiy = Diy.Create(context, model);
            if (newDiy == null)
            {
                return null;
            }
            context.Diys.Add(newDiy);
            context.SaveChanges();
            return newDiy.GetViewModel;
        }

        public DiyViewModel? Update(DiyBindingModel model)
        {
            using var context = new SchoolDataBase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var diy = context.Diys.FirstOrDefault(rec => rec.Id == model.Id);
                if (diy == null)
                {
                    return null;
                }
                diy.Update(model);
                context.SaveChanges();
                diy.UpdateInterests(context, model);
                transaction.Commit();
                return diy.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }

        public DiyViewModel? Delete(DiyBindingModel model)
        {
            using var context = new SchoolDataBase();
            var element = context.Diys
                .Include(x => x.Interests)
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Diys.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}