using CarShowroomContracts.BusinessLogic;
using CarShowroomContracts.StorageContracts;
using CarShowroomDataModels.Dtos;
using CarShowroomDataModels.SearchModel;
using CarShowroomDataModels.Views;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarShowroomBusinessLogic.BusinessLogic
{
    public class ModelLogic : IModelLogic
    {
        private readonly IModelStorage _modelStorage;

        public ModelLogic(IModelStorage storage)
        {
            _modelStorage = storage;
        }

        public List<ModelView>? ReadList(ModelSearch? model)
        {
            var list = model == null ? _modelStorage.GetFullList() : _modelStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public ModelView? ReadElement(ModelSearch model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _modelStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

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

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

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

        private void CheckModel(ModelDto model, bool withParams = true)
        {
            if (model == null)
                throw new ArgumentNullException(nameof(model));
            if (!withParams)
                return;
            if (string.IsNullOrEmpty(model.Name))
                throw new InvalidOperationException();
            if (model.MakeId < 0)
                throw new InvalidOperationException();
            if (model.Price < 0)
                throw new InvalidOperationException();
            var element = _modelStorage.GetElement(new ModelSearch
            {
                Name = model.Name,
            });
            if (element != null && element.Id != model.Id)
                throw new InvalidOperationException();
        }
    }
}