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

namespace ServiceSourceBusinessLogic.BusinessLogic {
    public class TaskLogic : ITaskLogic {

        private readonly ILogger _logger;
        private readonly ITaskStorage _storage;

        public TaskLogic(ILogger<ITaskLogic> logger, ITaskStorage storage) {
            _logger = logger;
            _storage = storage;
        }

        public bool Create(TaskBindingModel model) {
            CheckModel(model);
            if (_storage.Insert(model) == null) {
                _logger.LogInformation("Insert operatin failed");
                return false;
            }
            return true;
        }

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

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

        public TaskViewModel? ReadElement(TaskSearchModel model) {
            if (model == null) {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation($"ReadElement.Id:{model.Id}");
            var element = _storage.GetElement(model);
            if (element == null) {
                _logger.LogWarning("ReadElement.Element not found");
                return null;
            }
            _logger.LogInformation($"ReadElement.Find.Id:{element.Id}");
            return element;
        }

        public List<TaskViewModel>? ReadList(TaskSearchModel model) {
            _logger.LogInformation($"ReadList.Id:{model.Id}");
            var list = _storage.GetFullList();
            if (list == null) {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation($"ReadList.Count:{list.Count}");
            return list;
        }

        private void CheckModel (TaskBindingModel model, bool withParams = true) {
            if (string.IsNullOrEmpty(model.Id.ToString())) {
                throw new ArgumentNullException("Нет номера задачи", nameof(model.Id));
            }
            if (!withParams) {
                return;
            }
            if (string.IsNullOrEmpty(model.Name)) {
                throw new ArgumentNullException("Нет номера модели", nameof(model.Name));
            }
            _logger.LogInformation($"Task.Id:{model.Id}.Name:{model.Name}");
            var task = _storage.GetElement(new TaskSearchModel { Name = model.Name });
            if (task != null && task.Id != model.Id) {
                throw new InvalidOperationException("Такая задача уже создана");
            }
        }

    }
}