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

namespace CaseAccountingBusinessLogic.BusinessLogics
{
    public class ContractLogic : IContractLogic
    {
        private readonly ILogger _logger;
        private readonly IContractStorage _contractStorage;

        public ContractLogic(ILogger<ContractLogic> logger, IContractStorage contractStorage)
        {
            _logger = logger;
            _contractStorage = contractStorage;
        }

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

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

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

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

        private void CheckModel(ContractBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (model.UserId < 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор пользователя",
                    nameof(model.UserId));
            }
            if (model.Coast <= 0) 
            {
                throw new ArgumentNullException("Некорректная стоимость услуги",
                    nameof(model.Coast));
            }
            if (model.Service == string.Empty) 
            {
                throw new ArgumentNullException("Некорректное название услуги",
                    nameof(model.Service));
            }
        }
    }
}