using CoreDatabase;
using CoreDatabase.Models.Department;
using DepartmentContract.BindingModels;
using DepartmentContract.Services.IGenericEntityService;
using DepartmentContract.ViewModels;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using ToolsModule.ManagmentEntity;

namespace DepartmentDatabaseImplementation.Implementations.AbstractGenerticEntityService
{
    /// <summary>
    /// Реализация интерфейса IBasicDepartmentService
    /// </summary>
    public class BasicDepartmentService :
		AbstractGenerticEntityService<BasicDepartmentGetBindingModel, BasicDepartmentSetBindingModel, BasicDepartment, BasicDepartmentListViewModel, BasicDepartmentViewModel>,
		IBasicDepartmentService
	{
		protected override OperationResultModel AdditionalCheckingWhenAdding(DbContext context, BasicDepartmentSetBindingModel model) => OperationResultModel.Success(null);

		protected override OperationResultModel AdditionalCheckingWhenDeleting(DbContext context, BasicDepartment entity, BasicDepartmentGetBindingModel model) => OperationResultModel.Success(null);

		protected override IQueryable<BasicDepartment> AdditionalCheckingWhenReadingList(IQueryable<BasicDepartment> query, BasicDepartmentGetBindingModel model)
		{
			if (model.LecturerId.HasValue)
			{
				query = query.Where(x => x.LecturerId == model.LecturerId.Value);
			}
			return query;
		}

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

		protected override void AdditionalDeleting(DbContext context, BasicDepartment entity, BasicDepartmentGetBindingModel model)
		{
			var studentrecords = context.Set<Student>().Where(x => x.BasicDepartmentId == model.Id);
			foreach (var record in studentrecords)
			{
				record.BasicDepartmentId = null;
			}
			context.SaveChanges();

			var disciplinerecords = context.Set<Discipline>().Where(x => x.BasicDepartmentId == model.Id);
			foreach (var record in disciplinerecords)
			{
				record.BasicDepartmentId = null;
			}
			context.SaveChanges();
		}

		protected override BasicDepartment GetUniqueEntity(BasicDepartmentSetBindingModel model, IQueryable<BasicDepartment> query) => query.FirstOrDefault(x => x.BasicDepartmentName == model.BasicDepartmentName && x.Id != model.Id);

		protected override IQueryable<BasicDepartment> IncludingWhenReading(IQueryable<BasicDepartment> query) => query.Include(x => x.Lecturer);

		protected override IQueryable<BasicDepartment> OrderingWhenReading(IQueryable<BasicDepartment> query) => query.OrderBy(x => x.BasicDepartmentName);
	}
}