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 ResultLogic : IResultLogic
    {
        private readonly IResultStorage _resultStorage;
        public ResultLogic(IResultStorage resultStorage)
        {
            _resultStorage = resultStorage;
        }
        public List<ResultViewModel>? ReadList(ResultSearchModel? model)
        {
            var list = model == null ? _resultStorage.GetFullList() : _resultStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }
        public ResultViewModel? ReadElement(ResultSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _resultStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }
        public bool Create(ResultBindingModel model)
        {
            CheckModel(model);
            if (_resultStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Update(ResultBindingModel model)
        {
            CheckModel(model);
            if (_resultStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Delete(ResultBindingModel model)
        {
            CheckModel(model, false);
            if (_resultStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }
        private void CheckModel(ResultBindingModel model, bool withParams =
       true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            var element = _resultStorage.GetElement(new ResultSearchModel
            {
                StudentId = model.StudentId,
                SubjectId = model.SubjectId,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Проект с таким названием уже есть");
            }
        }
    }
}