using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using TravelCompanyContracts.BindingModels;
using TravelCompanyContracts.BusinessLogicsContracts;
using TravelCompanyContracts.SearchModels;
using TravelCompanyContracts.StoragesContracts;
using TravelCompanyContracts.ViewModels;
using Microsoft.Extensions.Logging;

namespace TravelCompanyBusinessLogic.BusinessLogic
{
    public class ClientLogic : IClientLogic
    {
        private readonly ILogger _logger;
        private readonly IClientStorage _clientStorage;

        public ClientLogic(ILogger<ClientLogic> logger, IClientStorage clientStorage)
        {
            _logger = logger;
            _clientStorage = clientStorage;
        }

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

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

        public ClientViewModel? ReadElement(ClientSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Id:{Id}. Email:{Email}. Password:{Password}",
                model.Id, model.Email, model.Password);
            var element = _clientStorage.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<ClientViewModel>? ReadList(ClientSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id:{Id}. Email:{Email}. Password:{Password}", model?.Id, model?.Email, model?.Password);
            var list = model == null ? _clientStorage.GetFullList() : _clientStorage.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(ClientBindingModel model)
        {
            CheckModel(model);
            if (_clientStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        private void CheckModel(ClientBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ClientFIO))
            {
                throw new ArgumentNullException("Нет ФИО клиента!", nameof(model.ClientFIO));

            }
            if (string.IsNullOrEmpty(model.Email))
            {
                throw new ArgumentNullException("Нет электронной почты клиента!", nameof(model.Email));
            }
            if (string.IsNullOrEmpty(model.Password))
            {
                throw new ArgumentNullException("У пользователя нет пароля!", nameof(model.Password));
            }
            _logger.LogInformation("Client. ClientFIO:{ClientFIO}. Password:{Password}." +
                " Email:{Email}. Id:{Id}", model.ClientFIO, model.Password, model.Email, model.Id);
            var element = _clientStorage.GetElement(new ClientSearchModel
            {
                Email = model.Email
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Клиент с таким логином уже существует!");
            }
        }
    }
}