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

namespace VeterinaryClinicBusinessLogics.BusinessLogics
{
    public class VisitLogic : IVisitLogic
    {
        private readonly ILogger _logger;
        private readonly IVisitStorage _visitStorage;

        public VisitLogic(ILogger<VisitLogic> logger, IVisitStorage visitStorage)
        {
            _logger = logger;
            _visitStorage = visitStorage;
        }

        public bool Create(VisitBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Create. Visit.Id: {Id}", model.Id);

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

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

        public VisitViewModel? ReadElement(VisitSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. DateFrom:{DateFrom}. DateTo:{DateTo}. VisitId:{Id}", model.DateFrom, model.DateTo, model.Id);
            var element = _visitStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. VisitId:{Id}", element.Id);
            return element;
        }

        public List<VisitViewModel>? ReadList(VisitSearchModel? model)
        {
            _logger.LogInformation("ReadList. VisitId:{Id}", model?.Id);
            var list = model == null ? _visitStorage.GetFullList() : _visitStorage.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(VisitBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Update. Visit.Id: {Id}", model.Id);

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

        private void CheckModel(VisitBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.Date == DateTime.MinValue)
            {
                throw new ArgumentNullException("Не указана дата визита", nameof(model.Date));
            }
            if (model.UserId <= 0)
            {
                throw new ArgumentNullException("Не указан идентификатор пользователя", nameof(model.UserId));
            }

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