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

namespace LawFirmDatabaseImplement.Implements
{
    public class LawStorage : ILawStorage
    {
        public List<LawViewModel> GetFullList()
        {
            using var context = new LawFirmDataBase();
            return context.Laws
             .Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public List<LawViewModel> GetFilteredList(LawSearchModel model)
        {
            if (string.IsNullOrEmpty(model.LawName))
            {
                return new();
            }
            using var context = new LawFirmDataBase();
            return context.Laws.Include(x => x.Components)
            .ThenInclude(x => x.Component)
            .Where(x => x.LawName.Contains(model.LawName))
            .ToList()
            .Select(x => x.GetViewModel)
            .ToList();
        }
        public LawViewModel? GetElement(LawSearchModel model)
        {
            if (string.IsNullOrEmpty(model.LawName) &&
            !model.Id.HasValue)
            {
                return null;
            }
            using var context = new LawFirmDataBase();
            return context.Laws
             .Include(x => x.Components)
             .ThenInclude(x => x.Component)
             .FirstOrDefault(x => (!string.IsNullOrEmpty(model.LawName) &&
            x.LawName == model.LawName) ||
            (model.Id.HasValue && x.Id ==
            model.Id))
            ?.GetViewModel;
        }
        public LawViewModel? Insert(LawBindingModel model)
        {
            using var context = new LawFirmDataBase();
            var newLaw = Law.Create(context, model);
            if (newLaw == null)
            {
                return null;
            }
            context.Laws.Add(newLaw);
            context.SaveChanges();
            return newLaw.GetViewModel;
        }
        public LawViewModel? Update(LawBindingModel model)
        {
            using var context = new LawFirmDataBase();
            using var transaction = context.Database.BeginTransaction();
            try
            {
                var Law = context.Laws.FirstOrDefault(rec =>
                rec.Id == model.Id);
                if (Law == null)
                {
                    return null;
                }
                Law.Update(model);
                context.SaveChanges();
                Law.UpdateComponents(context, model);
                transaction.Commit();
                return Law.GetViewModel;
            }
            catch
            {
                transaction.Rollback();
                throw;
            }
        }
        public LawViewModel? Delete(LawBindingModel model)
        {
            using var context = new LawFirmDataBase();
            var element = context.Laws
            .Include(x => x.Components)
            .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Laws.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}