using Microsoft.Extensions.Logging;
using TravelAgencyContracts.BindingModels;
using TravelAgencyContracts.BusinessLogicsContracts;
using TravelAgencyContracts.SearchModels;
using TravelAgencyContracts.StoragesContracts;
using TravelAgencyContracts.ViewModels;

namespace TravelAgencyBusinessLogic.BusinessLogics
{
    public class ExcursionGroupLogic : IExcursionGroupLogic
    {
        private readonly ILogger _logger;

        private readonly IExcursionGroupStorage _excursionGroupStorage;

        public ExcursionGroupLogic(ILogger<ExcursionGroupLogic> logger, IExcursionGroupStorage excursionGroupStorage)
        {
            _logger = logger;
            _excursionGroupStorage = excursionGroupStorage;
        }

        public List<ExcursionGroupViewModel>? ReadList(ExcursionGroupSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id: {Id}, ExcursionGroupName: {ExcursionGroupName}, UserId: {UserId}, GuideId: {GuideId}.", model?.Id, model?.ExcursionGroupName, model?.UserId, model?.GuideId);
            var list = (model == null) ? _excursionGroupStorage.GetFullList() : _excursionGroupStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public ExcursionGroupViewModel? ReadElement(ExcursionGroupSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. ExcursionGroup id: {Id}, ExcursionGroup name: {ExcursionGroupName}", model?.Id, model?.ExcursionGroupName);
            var element = _excursionGroupStorage.GetElement(model!);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. Id: {Id}", element.Id);
            return element;
        }

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

        public bool Update(ExcursionGroupBindingModel model)
        {
            CheckModel(model);
            if (_excursionGroupStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

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

        private void CheckModel(ExcursionGroupBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ExcursionGroupName))
            {
                throw new ArgumentNullException("Нет названия группы", nameof(model.ExcursionGroupName));
            }
            if (model.ParticipantsAmount <= 0)
            {
                throw new ArgumentNullException("Количество участников быть больше 0", nameof(model.ParticipantsAmount));
            }
            if (model.UserId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор пользователя", nameof(model.UserId));
            }
            _logger.LogInformation("ExcursionGroup. Id: {id}, ExcursionGroupName: {ExcursionGroupName}, ParticipantsAmount: {ParticipantsAmount}, UserId: {UserId}", model.Id, model.ExcursionGroupName, model.ParticipantsAmount, model.UserId);
            var element = _excursionGroupStorage.GetElement(new ExcursionGroupSearchModel
            {
                ExcursionGroupName = model.ExcursionGroupName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Группа с таким названием уже есть");
            }
        }
    }
}