using Contracts.BindingModels;
using Contracts.SearchModels;
using Contracts.StorageContracts;
using DatabaseImplement.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Diagnostics;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
	public class UserStorage : IUserStorage
	{
		public UserBindingModel? Delete(UserSearchModel model)
		{
			if (model.Id is null && model.Email is null)
			{
				return null;
			}

			var context = new Database();
			var user = context.Users.FirstOrDefault(u =>
				(model.Id.HasValue && u.Id == model.Id)
				|| (!string.IsNullOrEmpty(u.Email) && u.Email.Contains(model.Email)));

			if (user is null)
			{
				return null;
			}
			context.Remove(user);
			context.SaveChanges();

			return user.GetBindingModel();
		}

		public UserBindingModel? GetElement(UserSearchModel model)
		{
			if (model.Id is null && model.Email is null)
			{
				return null;
			}
			var context = new Database();
			return context.Users
				.Include(u => u.Role)
				.FirstOrDefault(u =>
					(model.Id.HasValue && u.Id == model.Id)
					|| (!string.IsNullOrEmpty(u.Email) && u.Email.Contains(model.Email)))
				?.GetBindingModel();
		}

		public IEnumerable<UserBindingModel> GetList(UserSearchModel? model)
		{
			var context = new Database();
			if (model is null)
			{
				return context.Users
					.Include(u => u.Role)
					.Select(r => r.GetBindingModel());
			}
			if (model.Id is null && model.Email is null)
			{
				return [];
			}
			return context.Users
				.Where(u =>
					(model.Id.HasValue && u.Id == model.Id)
					|| (!string.IsNullOrEmpty(u.Email) && u.Email.Contains(model.Email)))
				.Include(u => u.Role)
				.Select(r => r.GetBindingModel());
		}

		public UserBindingModel? Insert(UserBindingModel model)
		{
			var context = new Database();
			var role = context.Roles.FirstOrDefault(r => r.Id == model.Role.Id);
			if (role is null)
			{
				return null;
			}
			var newUser = Models.User.ToUserFromBinding(model, role);

			context.Users.Add(newUser);
			context.SaveChanges();

			return newUser.GetBindingModel();
		}

		public UserBindingModel? Update(UserBindingModel model)
		{
			var context = new Database();
			var user = context.Users
				.FirstOrDefault(u => u.Id == model.Id);
			var role = context.Roles.FirstOrDefault(r => r.Id == model.Role.Id);

			if (user is null || role is null)
			{
				return null;
			}

			user.Update(model, role);

			context.SaveChanges();
			return user.GetBindingModel();
		}
	}
}