53 lines
2.4 KiB
C#
53 lines
2.4 KiB
C#
using System;
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namespace Decentralized.Domain
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{
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/// <summary>一次出金到银行的结果。</summary>
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public sealed class CashoutResult
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{
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public double Requested;
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public double Received;
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public double Tax;
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}
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/// <summary>
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/// 合规交易所 Poinbase：只收干净的币（钱包往充值地址最多转“价值 − 污点”，见 <see cref="Wallet.TransferClean"/>），账户没有污点。
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/// 出金到银行把 CRC 兑回信用点，扣手续费，只对超出成本的部分计税，不做审查。
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/// </summary>
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public sealed class Exchange
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{
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/// <summary>Poinbase 上架的币：只有这些能充值、能在现货交易。黑市的 CRT、革命军的 CRA 合规交易所不收。</summary>
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public static readonly string[] Listed = { Assets.PSC, Assets.CRC, Assets.SPARK };
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/// <summary>存档迁移（数据版本 5）：旧存档里 Poinbase 账户和永续仓位带的污点额（信用点），清零后返回总数，由调用方挪到 1 号钱包一起摊。</summary>
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public static double TakeLegacyTaint(Wallet account, System.Collections.Generic.IEnumerable<PerpPosition> positions)
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{
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double t = account.LegacyTaint;
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account.LegacyTaint = 0;
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foreach (var p in positions) { t += p.LegacyTaint; p.LegacyTaint = 0; }
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return t;
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}
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/// <summary>
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/// 从账户里取出 amount 个 CRC 兑成信用点（按 CRC 当前价格，平时为 1；脱锚期间按市价），扣手续费。成本按取出部分的价值比例带走，
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/// 只对超出成本的部分计税。
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/// </summary>
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public CashoutResult Cashout(Wallet account, double amount, Func<string, double> price)
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{
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amount = Math.Min(amount, account.Get(Assets.CRC));
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var r = new CashoutResult { Requested = amount };
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if (amount <= 0) return r;
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double total = account.Value(price);
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double value = amount * price(Assets.CRC);
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double share = total > 0 ? Math.Min(1, value / total) : 0;
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double basis = account.Basis * share;
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account.Add(Assets.CRC, -amount);
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account.Basis -= basis;
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double got = value * (1 - Tuning.ExchangeFee);
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r.Tax = Math.Max(0, got - basis) * Tuning.TaxRate;
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r.Received = got;
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return r;
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}
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}
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}
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