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 CategoryLogic : ICategoryLogic
    {
        private readonly ILogger _logger;
        private readonly ICategoryStorage _categoryStorage;

        public CategoryLogic(ILogger<CategoryLogic> logger, ICategoryStorage categoryStorage)
        {
            _logger = logger;
            _categoryStorage = categoryStorage;
        }

        public bool Create(CategoryBindingModel model)
        {
            CheckModel(model);
            if (_categoryStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(CategoryBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);
            if (_categoryStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }

        public CategoryViewModel? ReadElement(CategorySearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Name:{FIO}.Id:{ Id}",
                model.Name, model.Id);
            var element = _categoryStorage.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<CategoryViewModel>? ReadList(CategorySearchModel? model)
        {
            _logger.LogInformation("ReadList. Name:{Name}.Id:{ Id} ", model?.Name, model?.Id);
            var list = (model == null) ? _categoryStorage.GetFullList() :
            _categoryStorage.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(CategoryBindingModel model)
        {
            CheckModel(model);
            if (_categoryStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(CategoryBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Нет названия категории", nameof(model.Name));
            }
            if (string.IsNullOrEmpty(model.Description))
            {
                throw new ArgumentNullException("Нет описания категории", nameof(model.Description));
            }
            _logger.LogInformation("Caregory. Id: {Id}, Name: {Name}", model.Id, model.Name);
            var element = _categoryStorage.GetElement(new CategorySearchModel
            {
                Name = model.Name,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Категория с таким названием уже есть");
            }
        }
    }
}