using Microsoft.Extensions.Logging;
using SchoolAgainStudyContracts.BindingModel;
using SchoolAgainStudyContracts.BusinessLogicContracts;
using SchoolAgainStudyContracts.SearchModel;
using SchoolAgainStudyContracts.StorageContracts;
using SchoolAgainStudyContracts.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace SchoolAgainStudyBusinessLogic.BusinessLogic
{
    public class DiyLogic : IDiyLogic
    {
        private readonly ILogger _logger;
        private readonly IDiyStorage _diyStorage;
        public DiyLogic(ILogger<DiyLogic> logger, IDiyStorage diyStorage)
        {
            _logger = logger;
            _diyStorage = diyStorage;
        }
        public List<DiyViewModel>? ReadList(DiySearchModel? model)
        {
            _logger.LogInformation("ReadList. Title:{Title}.Id:{ Id}", model?.Title, model?.Id);
            var list = model == null ? _diyStorage.GetFullList() : _diyStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count:{Count}", list.Count);
            return list;
        }
        public DiyViewModel? ReadElement(DiySearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation("ReadElement. Title:{Title}. Id:{ Id}", model.Title, model.Id);
            var element = _diyStorage.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(DiyBindingModel model)
        {
            CheckModel(model);
            if (_diyStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(DiyBindingModel model)
        {
            CheckModel(model);
            if (_diyStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(DiyBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id:{Id}", model.Id);
            if (_diyStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        private void CheckModel(DiyBindingModel model, bool withParams =
       true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Title))
            {
                throw new ArgumentNullException("Не задано название", nameof(model.Title));
            }
            if (string.IsNullOrEmpty(model.Description))
            {
                throw new ArgumentNullException("Не задано описание", nameof(model.Description));
            }
            if (model.StudentId <= 0)
            {
                throw new ArgumentNullException("Неверно задан идентификатор школьника", nameof(model.StudentId));
            }
            if (model.TaskId <= 0)
            {
                throw new ArgumentNullException("Неверно задан идентификатор задания", nameof(model.TaskId));
            }

            _logger.LogInformation("Diy. Titel:{Title}.Description{Description}.StudentId:{StudentId}.TaskId{TaskId} Id: {Id}", model.Title,model.Description, model.StudentId,model.TaskId, model.Id);
            var element = _diyStorage.GetElement(new DiySearchModel
            {
                Title = model.Title,
                StudentId = model.StudentId
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Поделка с таким названием уже есть");
            }
        }
    }
}