using DatabaseCore;
using DatabaseCore.Models.Department;
using DepartmentBusinessLogic.BindingModels;
using DepartmentBusinessLogic.Interfaces;
using DepartmentBusinessLogic.ViewModels;
using Microsoft.EntityFrameworkCore;
using ModuleTools.Enums;
using ModuleTools.Models;
using System;
using System.Linq;

namespace DepartmentDatabaseImplementation.Implementations
{
	/// <summary>
	/// Реализация IEmployeeService
	/// </summary>
	public class EmployeeService :
		AbstractGenerticEntityService<EmployeeGetBindingModel, EmployeeSetBindingModel, Employee, EmployeeListViewModel, EmployeeViewModel>, 
		IEmployeeService
	{
		protected override OperationResultModel AdditionalCheckingWhenAdding(DbContext context, EmployeeSetBindingModel model) => OperationResultModel.Success(null);

		protected override OperationResultModel AdditionalCheckingWhenDeleting(DbContext context, Employee entity, EmployeeGetBindingModel model)
		{
			if (entity.User == null)
			{
				return OperationResultModel.Error("Error:", "Не найден пользователь от сотрудника", ResultServiceStatusCode.NotFound);
			}
			if (context.Set<Classroom>().Any(x => x.EmployeeId == model.Id && !x.IsDeleted))
			{
				return OperationResultModel.Error("Error:", "Есть аудитории, у которых этот сотрудник указан ответственным", ResultServiceStatusCode.ExsistItem);
			}
			return OperationResultModel.Success(null);
		}

		protected override IQueryable<Employee> AdditionalCheckingWhenReadingList(IQueryable<Employee> query, EmployeeGetBindingModel model)
		{
			if (model.UserId.HasValue)
			{
				query = query.Where(x => x.UserId == model.UserId);
			}
			return query;
		}

		protected override OperationResultModel AdditionalCheckingWhenUpdateing(DbContext context, EmployeeSetBindingModel model) => OperationResultModel.Success(null);

		protected override void AdditionalDeleting(DbContext context, Employee entity, EmployeeGetBindingModel model)
		{
			entity.User.IsDeleted = true;
			entity.User.DateDelete = DateTime.Now;

			context.SaveChanges();

			var links = context.Set<EmployeePost>().Where(x => x.EmployeeId == model.Id);
			foreach (var link in links)
			{
				link.IsDeleted = true;
				link.DateDelete = DateTime.Now;
			}
			context.SaveChanges();
		}

		protected override Employee GetUniqueEntity(EmployeeSetBindingModel model, DbContext context) => context.Set<Employee>().FirstOrDefault(x => x.LastName == model.LastName && x.FirstName == model.FirstName &&
																														   x.Patronymic == model.Patronymic && x.Id != model.Id);

		protected override IQueryable<Employee> IncludingWhenReading(IQueryable<Employee> query) => query
				.Include(x => x.EmployeePosts).Include("EmployeePosts.Post");

		protected override IQueryable<Employee> OrderingWhenReading(IQueryable<Employee> query) => query
			.OrderByDescending(x => x.EmployeePosts.Max(y => y.Post.Order))
			.ThenBy(x => x.LastName)
			.ThenBy(x => x.FirstName);
	}
}