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

namespace BankBusinessLogic.BusinessLogics
{
    public class ProgramLogic : IProgramLogic
    {
        private readonly ILogger _logger;
        private readonly IProgramStorage _programStorage;
        public ProgramLogic(ILogger<ProgramLogic> logger, 
            IProgramStorage programStorage)
        {
            _logger = logger;
            _programStorage = programStorage;
        }
        public bool Create(ProgramBindingModel model)
        {
            CheckModel(model);
            if (_programStorage.Insert(model) == null)
            {
                _logger.LogWarning("Insert operation failed");
                return false;
            }
            return true;
        }
        public bool Update(ProgramBindingModel model)
        {
            CheckModel(model);
            if (_programStorage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }
        public bool Delete(ProgramBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation("Delete. Id: {Id}", model.Id);
            if (_programStorage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;
        }
        public List<ProgramViewModel>? ReadList(ProgramSearchModel? model)
        {
            _logger.LogInformation(
                "ReadList. ProgramName: {ProgramName}. Id: {Id}",
                model?.ProgramName, model?.Id);
            var list = model == null ? _programStorage.GetFullList() :
                _programStorage.GetFilteredList(model);
            if (list == null)
            {
                _logger.LogWarning("ReadList return null list");
                return null;
            }
            _logger.LogInformation("ReadList. Count: {Count}", list.Count);
            return list;
        }
        public ProgramViewModel? ReadElement(ProgramSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation(
                "ReadElement. ProgramName: {ProgramName}. Id: {Id}",
                model.ProgramName, model.Id);
            var element = _programStorage.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(ProgramBindingModel model, 
            bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.ProgramName))
            {
                throw new ArgumentNullException(
                    "Отсутствует название кредитной программы",
                    nameof(model.ProgramName));
            }
            if (model.InterestRate < 0)
            {
                throw new ArgumentNullException(
                    "Процентная ставка должна быть не менее 0",
                    nameof(model.InterestRate));
            }
            _logger.LogInformation("Program. Id: {Id}. ProgramName: " +
                "{ProgramName}. InterestRate: {InterestRate}.",
                model.Id, model.ProgramName, model.InterestRate);
            var element = _programStorage.GetElement(new ProgramSearchModel
            {
                ProgramName = model.ProgramName,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException(
                    "Кредитная программа с таким названием уже существует");
            }
        }
    }
}