using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using UniversityContracts.BindingModels;
using UniversityContracts.SearchModels;
using UniversityContracts.StoragesContracts;
using UniversityContracts.ViewModels;
using UniversityDataBaseImplemet.Models;

namespace UniversityDataBaseImplemet.Implements
{
    public class RoleStorage : IRoleStorage
    {
        public RoleViewModel? Delete(RoleBindingModel model)
        {
            using var context = new Database();
            var element = context.Roles
                .FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Roles.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public RoleViewModel? GetElement(RoleSearchModel model)
        {
            using var context = new Database();
            if (model.Id.HasValue)
                return context.Roles
                    .FirstOrDefault(record => record.Id == model.Id)
                    ?.GetViewModel;
            if (!string.IsNullOrEmpty(model.Name))
                return context.Roles
                    .FirstOrDefault(record => record.Name.Equals(model.Name))
                    ?.GetViewModel;
            return null;
        }

        public List<RoleViewModel> GetFilteredList(RoleSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name))
            {
                return new();
            }
            using var context = new Database();
            return context.Roles
                .Where(record => record.Name.Contains(model.Name))
                .Select(record => record.GetViewModel)
                .ToList();
        }

        public List<RoleViewModel> GetFullList()
        {
            using var context = new Database();
            return context.Roles.Select(record => record.GetViewModel).ToList();
        }

        public RoleViewModel? Insert(RoleBindingModel model)
        {
            var newRole = Role.Create(model);
            if (newRole == null)
            {
                return null;
            }
            using var context = new Database();
            context.Roles.Add(newRole);
            context.SaveChanges();
            return newRole.GetViewModel;
        }

        public RoleViewModel? Update(RoleBindingModel model)
        {
            using var context = new Database();
            var client = context.Roles.FirstOrDefault(record => record.Id == model.Id);
            if (client == null)
            {
                return null;
            }
            client.Update(model);
            context.SaveChanges();
            return client.GetViewModel;
        }
    }
}