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

namespace AbstractLawFirmBusinessLogic.BusinessLogic
{
    public class DocumentLogic : IDocumentLogic
    {
        private readonly ILogger _logger;
        private readonly IDocumentStorage _documentStorage;
        public DocumentLogic(ILogger<DocumentLogic> logger, IDocumentStorage
        documentStorage)
        {
            _logger = logger;
            _documentStorage = documentStorage;
        }
        public List<DocumentViewModel>? ReadList(DocumentSearchModel? model)
        {
            _logger.LogInformation("ReadList. DocumentName:{DocumentName}.Id:{ Id}", model?.DocumentName, model?.Id);
            var list = model == null ? _documentStorage.GetFullList() : _documentStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
        public DocumentViewModel? ReadElement(DocumentSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. DocumentName:{DocumentName}.Id:{ Id}", model.DocumentName, model.Id);
            var element = _documentStorage.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(DocumentBindingModel model)
        {
            CheckModel(model);
            if (_documentStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(DocumentBindingModel model)
        {
            CheckModel(model);
            if (_documentStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(DocumentBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);
            if (_documentStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        private void CheckModel(DocumentBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.DocumentName))
            {
                throw new ArgumentNullException("Нет названия пакета документов",
               nameof(model.DocumentName));
            }
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Цена пакета документов должна быть больше 0", nameof(model.Price));
            }
            _logger.LogInformation("Document. DocumentName:{DocumentName}.Cost:{ Cost}. Id: { Id}", model.DocumentName, model.Price, model.Id);
            var element = _documentStorage.GetElement(new DocumentSearchModel
            {
                DocumentName = model.DocumentName
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Пакет документов с таким названием уже есть");
            }
        }
    }
}