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

namespace ComputerStoreBusinessLogic.BusinessLogic
{
    public class SellerLogic : ISellerLogic
    {
        private readonly ILogger _logger;
        private readonly ISellerStorage _sellerStorage;
        public SellerLogic(ILogger<SellerLogic> logger, ISellerStorage sellerStorage)
        {
            _logger = logger;
            _sellerStorage = sellerStorage;
        }
        public bool Create(SellerBindingModel model)
        {
            CheckSeller(model);
            if (_sellerStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }

        public bool Update(SellerBindingModel model)
        {
            CheckSeller(model);
            if (_sellerStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(SellerBindingModel model)
        {
            CheckSeller(model, false);
            _logger.LogInformation("Delete. ID:{ID}", model.ID);
            if (_sellerStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }

        public SellerViewModel? ReadElement(SellerSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Username:{Username}.ID:{ ID}", model.Username, model.ID);
            var element = _sellerStorage.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<SellerViewModel>? ReadList(SellerSearchModel? model)
        {
            _logger.LogInformation("ReadList. Username:{Username}. ID:{ ID}", model?.Username, model?.ID);

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

            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

        public void CheckSeller(SellerBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Username))
            {
                throw new ArgumentNullException("Invalid username of user", nameof(model.Username));
            }
            if (string.IsNullOrEmpty(model.Password))
            {
                throw new ArgumentNullException("Invalid password of user", nameof(model.Password));
            }

            _logger.LogInformation("Client. Username:{ Username}. ID: { ID} ", model.Username, model.ID);

            var element = _sellerStorage.GetElement(new SellerSearchModel
            {
                Username = model.Username
            });

            if (element != null && element.ID != model.ID)
            {
                throw new InvalidOperationException("Seller with such username already exists.");
            }
        }
    }
}