Yi.Framework/Yi.Abp.Net8/module/bbs/Yi.Framework.Bbs.Domain/Managers/BankManager.cs

using Volo.Abp.Domain.Services;
using Volo.Abp.EventBus.Local;
using Yi.Framework.Bbs.Domain.Entities.Bank;
using Yi.Framework.Bbs.Domain.Managers.BankValue;
using Yi.Framework.Bbs.Domain.Shared.Enums;
using Yi.Framework.Bbs.Domain.Shared.Etos;
using Yi.Framework.Rbac.Domain.Shared.Dtos;
using Yi.Framework.SqlSugarCore.Abstractions;
using static System.Runtime.InteropServices.JavaScript.JSType;

namespace Yi.Framework.Bbs.Domain.Managers
{
    /// <summary>
    /// 银行领域，进阶了哦~
    /// </summary>
    public class BankManager : DomainService
    {
        private const decimal DefalutRate = 1.2m;
        private ISqlSugarRepository<BankCardAggregateRoot> _repository;
        private ILocalEventBus _localEventBus;
        private ISqlSugarRepository<InterestRecordsAggregateRoot> _interestRepository;
        private IBankValueProvider _bankValueProvider;
        public BankManager(ISqlSugarRepository<BankCardAggregateRoot> repository, ILocalEventBus localEventBus, ISqlSugarRepository<InterestRecordsAggregateRoot> interestRepository, IBankValueProvider bankValueProvider)
        {
            _repository = repository;
            _localEventBus = localEventBus;
            _interestRepository = interestRepository;
            _bankValueProvider = bankValueProvider;
        }

        /// <summary>
        /// 获取当前银行汇率
        /// </summary>
        public BankInterestRecordDto CurrentRate => GetCurrentInterestRate().GetAwaiter().GetResult();

        /// <summary>
        /// 用于存储当前汇率数据
        /// </summary>
        private static BankInterestRecordDto? _currentRateStore;

        /// <summary>
        /// 获取当前的银行汇率，如果为空会从数据库拿最新一条
        /// </summary>
        /// <returns></returns>
        public async Task<BankInterestRecordDto> GetCurrentInterestRate()
        {
            var output = new BankInterestRecordDto();
            //先判断时间是否与当前时间差1小时，小于1小时直接返回即可,可以由一个单例类提供
            if (_currentRateStore is null || _currentRateStore.IsExpire())
            {
                var currentInterestRecords =await CreateInterestRecordsAsync();
                output.ComparisonValue = currentInterestRecords.ComparisonValue;
                output.CreationTime = currentInterestRecords.CreationTime;
                output.Value = currentInterestRecords.Value;

                _currentRateStore = new BankInterestRecordDto()
                {
                    ComparisonValue = currentInterestRecords.ComparisonValue,
                    CreationTime = currentInterestRecords.CreationTime,
                    Value = currentInterestRecords.Value
                };

            }
            else
            {
                output = _currentRateStore;

            }

            return output;
        }

        /// <summary>
        /// 强制创建一个记录，不管时间到没到
        /// </summary>
        /// <returns></returns>
        private async Task<InterestRecordsAggregateRoot> CreateInterestRecordsAsync()
        {
            decimal oldValue = DefalutRate;

            var thirdPartyValue = await _bankValueProvider.GetValueAsync();
            //获取实际值的变化率
            decimal changeRate = (thirdPartyValue - _bankValueProvider.StandardValue) / (thirdPartyValue);

            //判断市场是否波动
            bool isFluctuate = IsMarketVolatility();
            //市场波动
            if (isFluctuate)
            {
                changeRate = 2 * changeRate;
            }

            //根据上一次的老值进行变化率比较
            var currentValue = oldValue + (oldValue * changeRate);

            var entity = new InterestRecordsAggregateRoot(thirdPartyValue, currentValue, isFluctuate);
            var output = await _interestRepository.InsertReturnEntityAsync(entity);

            return output;
        }

        /// <summary>
        /// 判断是否为波动市场,市场波动，变化率翻倍
        /// </summary>
        /// <returns></returns>
        private static bool IsMarketVolatility()
        {
            double probability = 0.1;
            Random random = new Random();
            return random.NextDouble() < probability;
        }

        /// <summary>
        /// 给用户申请银行卡
        /// </summary>
        /// <returns></returns>
        public async Task ApplyingBankCardAsync(Guid userId, int cardNumber)
        {
            var entities = Enumerable.Range(1, cardNumber).Select(x => new BankCardAggregateRoot(userId)).ToList();
            await _repository.InsertManyAsync(entities);
        }

        /// <summary>
        /// 进行银行卡提款
        /// </summary>
        /// <param name="cardId"></param>
        /// <returns></returns>
        public async Task DrawMoneyAsync(Guid cardId)
        {
            var entity = await _repository.GetByIdAsync(cardId);
            if (entity.BankCardState == BankCardStateEnum.Unused)
            {
                throw new UserFriendlyException("当前银行卡状态不能提款");
            }

            //这里其实不存在这个状态，只有等待状态，不需要去主动触发，前端判断即可
            if (entity.BankCardState == BankCardStateEnum.Full)
            {
                throw new UserFriendlyException("当前银行卡状态不能存款");
            }

            //可以提款
            if (entity.BankCardState == BankCardStateEnum.Wait)
            {
                decimal changeMoney = 0;
                //判断是否存满时间
                if (entity.IsStorageFull())
                {
                    changeMoney = this.CurrentRate.Value * entity.StorageMoney;
                }
                else
                {
                    changeMoney = entity.StorageMoney;
                }

                //提款
                entity.SetDrawMoney();
                await _repository.UpdateAsync(entity);

                //打钱，该卡状态钱更新，并提款加到用户钱钱里
                await _localEventBus.PublishAsync(new MoneyChangeEventArgs(entity.UserId, changeMoney),false);



            }
        }

        /// <summary>
        /// 给银行卡存款
        /// </summary>
        /// <param name="cardId"></param>
        /// <param name="moneyNum"></param>
        /// <returns></returns>
        public async Task DepositAsync(Guid cardId, decimal moneyNum)
        {
            var entity = await _repository.GetByIdAsync(cardId);
            if (entity.BankCardState != BankCardStateEnum.Unused)
            {
                throw new UserFriendlyException("当前银行卡状态不能存款");
            }
            //存款
            entity.SetStorageMoney(moneyNum);

            await _repository.UpdateAsync(entity);
            await _localEventBus.PublishAsync(new MoneyChangeEventArgs(entity.UserId, -moneyNum), false);

        }

    }
}