using BlogContracts.BindingModel;
using BlogContracts.BusinessLogicContracts;
using BlogContracts.SearchModels;
using BlogContracts.StorageContracts;
using BlogContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLogic
{
    public class CommentLogic : ICommentLogic
    {
        private readonly ICommentStorage _commentStorage;
        public CommentLogic(ICommentStorage CommentStorage)
        {
            _commentStorage = CommentStorage ?? throw new ArgumentNullException(nameof(CommentStorage));
        }

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

        public bool Delete(CommentBindingModel model)
        {
            CheckModel(model);
            if (_commentStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public CommentViewModel? ReadElement(CommentSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _commentStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<CommentViewModel>? ReadList(CommentSearchModel? model)
        {
            var list = model == null ? _commentStorage.GetFullList() : _commentStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public bool Update(CommentBindingModel model)
        {
            CheckModel(model);
            if (_commentStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }
        private void CheckModel(CommentBindingModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (string.IsNullOrEmpty(model.Text))
            {
                throw new ArgumentException("Отсутвует текст",
                    nameof(model.Text));
            }
            if (_commentStorage.GetElement(new CommentSearchModel
            {
                Text = model.Text,
            }) != null)
            {
                throw new InvalidOperationException("Такой тег уже существует");
            }
        }
    }
}