using HospitalContracts.BindingModels;
using HospitalContracts.BusinessLogicsContracts;
using HospitalContracts.SearchModels;
using HospitalContracts.StoragesContracts;
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.BusinessLogics
{
    public class IllnessLogic : IIllnessLogic
    {
        private readonly ILogger _logger;
        private readonly IIllnessStorage _illnessStorage;
        public IllnessLogic(ILogger<IllnessLogic> logger, IIllnessStorage illnessStorage)
        {
            _logger = logger;
            _illnessStorage = illnessStorage;
        }
        public List<IllnessViewModel>? ReadList(IllnessSearchModel? model)
        {
            _logger.LogInformation("ReadList. IllnessName:{IllnessName}.Id:{ Id}", model?.IllnessName, model?.Id);
            var list = model == null ? _illnessStorage.GetFullList() : _illnessStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
        public IllnessViewModel? ReadElement(IllnessSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. IllnessName:{IllnessName}.Id:{ Id}", model.IllnessName, model.Id);
            var element = _illnessStorage.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(IllnessBindingModel model)
        {
            CheckModel(model);
            if (_illnessStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(IllnessBindingModel model)
        {
            CheckModel(model);
            if (_illnessStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(IllnessBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);
            if (_illnessStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        private void CheckModel(IllnessBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.IllnessName))
            {
                throw new ArgumentNullException("Нет названия болезни",
               nameof(model.IllnessName));
            }
            if (string.IsNullOrEmpty(model.Form))
            {
                throw new ArgumentNullException("Нет формы болезни", nameof(model.Form));
            }
            _logger.LogInformation("Illness. IllnessName:{IllnessName}.Form:{ Form}. Id: { Id}", model.IllnessName, model.Form, model.Id);
            var element = _illnessStorage.GetElement(new IllnessSearchModel
            {
            IllnessName = model.IllnessName });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Болезнь с таким названием уже есть");
            }
        }
    }
}