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 UserLogic : IUserLogic
    {
        private readonly ILogger _logger;
        private readonly IUserStorage _userStorage;

        public UserLogic(ILogger<UserLogic> logger, IUserStorage userStorage)
        {
            _logger = logger;
            _userStorage = userStorage;
        }

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

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

        public bool Delete(UserBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. User.Id: {Id}", model.Id);

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

        public UserViewModel? ReadElement(UserSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            _logger.LogInformation("ReadElement. User.Id: {Id}. Email: {Email}. Password: {Password}", model?.Id, model?.Email, model?.Password);

            var element = _userStorage.GetElement(model!);
            if (element == null)
            {
                _logger.LogWarning("ReadElement. Element not found");
                return null;
            }

            _logger.LogInformation("ReadElement. Find User.Id: {Id}", element?.Id);
            return element;
        }

        public List<UserViewModel>? ReadList(UserSearchModel? model)
        {
            _logger.LogInformation("ReadList. User.Id: {Id}. Email: {Email}. FullName: {FullName}", model?.Id, model?.Email, model?.FullName);

            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList. Returned null list");
                return null;
            }

            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }

        public bool Update(UserBindingModel model)
        {
            CheckModel(model);
            _logger.LogInformation("Update. User.Id: {Id}", model.Id);

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

        private void CheckModel(UserBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.FullName))
            {
                throw new ArgumentNullException("Не указано ФИО", nameof(model.FullName));
            }
            if (string.IsNullOrEmpty(model.Phone))
            {
                throw new ArgumentNullException("Не указан номер телефона", nameof(model.Phone));
            }
            if (string.IsNullOrEmpty(model.Password))
            {
                throw new ArgumentNullException("Не указан пароль", nameof(model.Password));
            }
            if (string.IsNullOrEmpty(model.Email))
            {
                throw new ArgumentNullException("Не указана электронная почта", nameof(model.Email));
            }

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

            var element = _userStorage.GetElement(new UserSearchModel
            {
                Email = model.Email
            });
            if (element != null && !element.Id.Equals(model.Id))
            {
                throw new InvalidOperationException("Пользователь с данной электронной почтой уже существует");
            }
        }
    }
}