using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TaskTrackerContracts.BindingModels;
using TaskTrackerContracts.BusinessLogicsContracts;
using TaskTrackerContracts.SearchModels;
using TaskTrackerContracts.StoragesContracts;
using TaskTrackerContracts.ViewModels;

namespace TaskTrackerBusinessLogics.BusinessLogic
{
    public class DirectionLogic : IDirectionLogic
    {
        private readonly IDirectionStorage _directionStorage;

        public DirectionLogic(IDirectionStorage directionStorage)
        {
            _directionStorage = directionStorage;
        }

        public List<DirectionViewModel>? ReadList(DirectionSearchModel? model)
        {
            var list = model == null ? _directionStorage.GetFullList() : _directionStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public DirectionViewModel? ReadElement(DirectionSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _directionStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

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

        public bool Update(DirectionBindingModel model)
        {
            CheckModel(model);
            if (_directionStorage.Update(model) == null)
            {

                return false;
            }
            return true;
        }

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

        private void CheckModel(DirectionBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Нет названия", nameof(model.Name));
            }

            var element = _directionStorage.GetElement(new DirectionSearchModel
            {
                Name = model.Name
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Организация с таким названием уже есть");
            }
        }
    }
}