76 lines
3.5 KiB
C#
76 lines
3.5 KiB
C#
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using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace Decentralized.Domain
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{
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public enum AmlOutcome { Clear, Light, Heavy }
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/// <summary>一次合规出金的结果。罪证由接入层记进游戏的罪证账本（销赃）。</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 Confiscated;
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public double Crime;
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public double Tax;
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public double HitChance;
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public AmlOutcome Outcome;
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}
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/// <summary>
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/// 合规交易所出金：CRC 兑回信用点，过 AML。审查按单笔金额、7 天累计金额、污点比例、是否来自混币器或被标记地址判定。
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/// 轻度命中（污点 < 30%）没收污点部分、不记罪证；重度命中没收污点部分，并把污点额记为销赃罪证。
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/// </summary>
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public sealed class Exchange
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{
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/// <summary>最近的出金记录：(天, 金额)。</summary>
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public List<KeyValuePair<int, double>> History = new List<KeyValuePair<int, double>>();
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public static double HitChance(double amount, double taint, double recentTotal, double rent, bool fromMixerOrFlagged)
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{
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if (amount <= 0) return 0;
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double ratio = taint / amount;
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double big = Tuning.AmlBigRents * rent, cum = Tuning.AmlCumRents * rent;
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double p = 0;
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if (ratio >= Tuning.AmlTaintRatio) p += ratio * 1.5;
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p += Math.Max(0, (amount - big) / big) * 0.2;
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p += Math.Max(0, (recentTotal + amount - cum) / cum) * 0.2;
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if (fromMixerOrFlagged) p += Tuning.AmlMixerBonus;
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return Math.Min(Tuning.AmlMaxChance, p);
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}
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/// <summary>
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/// 从地址里取出 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。污点与成本按比例随取出部分计算；
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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 wallet, double amount, Func<string, double> price, int day, double rent, bool fromMixer, Rng rng)
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{
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amount = Math.Min(amount, wallet.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 = wallet.Value(price);
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double share = total > 0 ? Math.Min(1, amount * price(Assets.CRC) / total) : 0;
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double taint = wallet.Taint * share, basis = wallet.Basis * share;
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History.RemoveAll(h => h.Key <= day - Tuning.AmlWindowDays);
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double recent = History.Sum(h => h.Value);
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double value = amount * price(Assets.CRC);
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r.HitChance = HitChance(value, taint, recent, rent, fromMixer || wallet.Flagged);
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wallet.Add(Assets.CRC, -amount);
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wallet.Taint -= taint;
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wallet.Basis -= basis;
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History.Add(new KeyValuePair<int, double>(day, value));
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double got = value * (1 - Tuning.ExchangeFee);
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if (rng.Chance(r.HitChance))
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{
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r.Outcome = taint / value >= Tuning.AmlHeavyRatio ? AmlOutcome.Heavy : AmlOutcome.Light;
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r.Confiscated = Math.Min(got, taint);
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got -= r.Confiscated;
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if (r.Outcome == AmlOutcome.Heavy) r.Crime = taint;
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}
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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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