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 OrganizationLogic : IOrganizationLogic
    {
        private readonly IOrganizationStorage _organizationStorage;

        public OrganizationLogic(IOrganizationStorage organizationStorage)
        {
            _organizationStorage = organizationStorage;
        }

        public List<OrganizationViewModel>? ReadList(OrganizationSearchModel? model)
        {
            var list = model == null ? _organizationStorage.GetFullList() : _organizationStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public OrganizationViewModel? ReadElement(OrganizationSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _organizationStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

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

        public bool Update(OrganizationBindingModel model)
        {
            CheckModel(model);
            if (_organizationStorage.Update(model) == null)
            {

                return false;
            }
            return true;
        }

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

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

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