using ForumContracts.BindingModels;
using ForumContracts.BusinessLogicContracts;
using ForumContracts.SearchModels;
using ForumContracts.StorageContracts;
using ForumContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ForumBusinessLogic.BusinessLogic
{
    public class AnswerLogic : IAnswerLogic
    {
        private readonly ILogger _logger;

        private readonly IAnswerStorage _answerStorage;

        public AnswerLogic(ILogger<AnswerLogic> logger, IAnswerStorage answerStorage)
        {
            _logger = logger;
            _answerStorage = answerStorage;
        }

        public bool Create(AnswerBindingModel model)
        {
            CheckModel(model);

            if (_answerStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }

            return true;
        }

        public bool Delete(AnswerBindingModel model)
        {
            CheckModel(model, false);

            _logger.LogInformation("Delete. Id:{Id}", model.Id);

            if (_answerStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }

            return true;
        }

        public AnswerViewModel? ReadElement(AnswerSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            _logger.LogInformation("ReadElement. AnswerDes:{AnswerDes}.Id:{ Id}", model.AnswerDes, model.Id);

            var element = _answerStorage.GetElement(model);

            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }

            _logger.LogInformation("ReadElement find. Id:{Id}", element.Id);

            return element;
        }

        public List<AnswerViewModel>? ReadList(AnswerSearchModel? model)
        {
            _logger.LogInformation("ReadList. AnswerDes:{AnswerDes}.Id:{ Id}", model?.AnswerDes, model?.Id);

            var list = model == null ? _answerStorage.GetFullList() : _answerStorage.GetFilteredList(model);

            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count:{Count}", list.Count);

            return list;
        }

        public bool Update(AnswerBindingModel model)
        {
            CheckModel(model);

            if (_answerStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }

            return true;
        }

        private void CheckModel(AnswerBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            if (!withParams)
            {
                return;
            }

            if (string.IsNullOrEmpty(model.AnswerDes))
            {
                throw new ArgumentNullException("Нет ответа", nameof(model.AnswerDes));
            }

            _logger.LogInformation("Answer. AnswerDes:{AnswerDes}.ResponseDate:{ ResponseDate}. Id: { Id}", model.AnswerDes, model.ResponseDate, model.Id);
        }
    }
}