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 QuestionLogic : IQuestionLogic
    {
        private readonly ILogger _logger;

        private readonly IQuestionStorage _questionStorage;

        public QuestionLogic(ILogger<QuestionLogic> logger, IQuestionStorage questionStorage)
        {
            _logger = logger;
            _questionStorage = questionStorage;
        }
        public bool Create(QuestionBindingModel model)
        {
            CheckModel(model);

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

            return true;
        }

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

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

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

            return true;
        }

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

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

            var element = _questionStorage.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<QuestionViewModel>? ReadList(QuestionSearchModel? model)
        {
            _logger.LogInformation("ReadList. QuestionDes:{QuestionDes}.Id:{ Id}", model?.QuestionDes, model?.Id);

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

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

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

            return list;
        }

        public List<QuestionViewModel>? HardRequest(QuestionSearchModel? model)
        {
            return _questionStorage.HardRequest(new QuestionSearchModel
            {
                DateFrom = model.DateFrom,
                DateTo = model.DateTo
            })
                .Select(x => new QuestionViewModel
                {
                    CreateDate = x.CreateDate,
                    QuestionDes = x.QuestionDes,
                    UserName = x.UserName,
                    CategoryName = x.CategoryName
                })
                .ToList();
        }

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

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

            return true;
        }

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

            if (!withParams)
            {
                return;
            }

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

            _logger.LogInformation("Question. QuestionDes:{QuestionDes}.CreateDate:{ CreateDate}. Id: { Id}", model.QuestionDes, model.CreateDate, model.Id);
        }
    }
}