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

namespace HospitalBusinessLogic
{
    public class PatientLogic : IPatientLogic
    {
        private readonly ILogger _logger;
        private readonly IPatientStorage _patientStorage;

        public PatientLogic(ILogger<PatientLogic> logger, IPatientStorage patientStorage)
        {
            _logger = logger;
            _patientStorage = patientStorage;
        }

        public PatientViewModel? ReadElement(PatientSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Id:{ Id}", model.Id);
            var element = _patientStorage.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<PatientViewModel>? ReadList(PatientSearchModel? model)
        {
            _logger.LogInformation("ReadList. Id:{ Id}", model?.Id);
            var list = model == null ? _patientStorage.GetFullList() : _patientStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }

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

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


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

        private void CheckModel(PatientBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Нет имени пациента",
               nameof(model.Name));
            }
            // TODO: проверка на наличие даты рождения и фамилии в модели? 
            _logger.LogInformation("Patient. Surname:{ Date}. Name: {Name}. Patronymic: {Patronymic}. BirthDate: {BirthDate}. Id: { Id}", model.Surname, model.Name, model.Patronymic, model.BirthDate, model.Id);
        }

    }
}