using BankContracts.BindingModels;
using BankContracts.BusinessLogicsContracts;
using BankContracts.SearchModels;
using BankContracts.StoragesContracts;
using BankContracts.ViewModels;
using Microsoft.Extensions.Logging;

namespace BankBusinessLogic.BusinessLogics
{
    public class CurrencyLogic : ICurrencyLogic
    {
        private readonly ILogger _logger;
        private readonly ICurrencyStorage _currencyStorage;
        public CurrencyLogic(ILogger<CurrencyLogic> logger, 
            ICurrencyStorage currencyStorage)
        {
            _logger = logger;
            _currencyStorage = currencyStorage;
        }
        public bool Create(CurrencyBindingModel model)
        {
            CheckModel(model);
            if (_currencyStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(CurrencyBindingModel model)
        {
            CheckModel(model);
            if (_currencyStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(CurrencyBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_currencyStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        public List<CurrencyViewModel>? ReadList(CurrencySearchModel? model)
        {
            _logger.LogInformation(
                "ReadList. CurrencyName: {CurrencyName}. Id: {Id}",
                model?.CurrencyName, model?.Id);
            var list = model == null ? _currencyStorage.GetFullList() :
                _currencyStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }
        public CurrencyViewModel? ReadElement(CurrencySearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation(
                "ReadElement. CurrencyName: {CurrencyName}. Id: {Id}",
                model.CurrencyName, model.Id);
            var element = _currencyStorage.GetElement(model);
            if (element == null)
            {
                _logger.LogWarning("ReadElement element not found");
                return null;
            }
            _logger.LogInformation("ReadElement find. Id: {Id}", element.Id);
            return element;
        }
        private void CheckModel(CurrencyBindingModel model, 
            bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.CurrencyName))
            {
                throw new ArgumentNullException(
                    "Отсутствует название валюты",
                    nameof(model.CurrencyName));
            }
            if (model.Course <= 0)
            {
                throw new ArgumentNullException(
                    "Курс должен быть больше 0",
                    nameof(model.Course));
            }
            _logger.LogInformation("Currency. Id: {Id}. CurrencyName: " +
                "{CurrencyName}. Course: {Course}.",
                model.Id, model.CurrencyName, model.Course);
            var element = _currencyStorage.GetElement(new CurrencySearchModel
            {
                CurrencyName = model.CurrencyName,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException(
                    "Курс с таким названием уже существует");
            }
        }
    }
}