SUBD_SushiBar/SushiBar/SushiBarBusinessLogic/BusinessLogics/TaskLogic.cs

using SushiBarContracts.BindingModels;
using SushiBarContracts.BusinessLogicContracts;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SushiBarBusinessLogic.BusinessLogics
{
    public class TaskLogic : ITaskLogic
    {
        private readonly ITaskStorage _taskStorage;

        public TaskLogic(ITaskStorage taskStorage)
        {
            _taskStorage = taskStorage;
        }
        public TaskViewModel? ReadElement(TaskSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            var element = _taskStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<TaskViewModel>? ReadList(TaskSearchModel? model)
        {
            var list = model == null ? _taskStorage.GetFullList() : _taskStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public bool Create(TaskBindingModel model)
        {
            CheckModel(model);
            if (_taskStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Delete(TaskBindingModel model)
        {
            CheckModel(model, false);
            if (_taskStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Update(TaskBindingModel model)
        {
            CheckModel(model);
            if (_taskStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool DeliveryTask(TaskBindingModel model)
        {
            return StatusUpdate(model, SushiBarDataModels.Enum.TaskStatus.Выдан);
        }

        public bool FinishTask(TaskBindingModel model)
        {
            return StatusUpdate(model, SushiBarDataModels.Enum.TaskStatus.Готов);
        }

        public bool TakeTaskInWork(TaskBindingModel model)
        {
            return StatusUpdate(model, SushiBarDataModels.Enum.TaskStatus.Выполняется);
        }

        private bool StatusUpdate(TaskBindingModel model, SushiBarDataModels.Enum.TaskStatus newStatus)
        {

            if (model.Status + 1 != newStatus)
            {
                return false;
            }
            model.Status = newStatus;
            if (_taskStorage.Update(model) == null)
            {
                model.Status--;
                return false;
            }
            return true;
        }

        private void CheckModel(TaskBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
        }
    }
}