第十阶段 stage 2（一）：交易对改为 X/CRC 池，任意币互换经 CRC 两跳路由，币价表改为 CRC 价格

src/Decentralized.Domain/Market.cs

@@ -4,6 +4,14 @@ using System.Linq;
 
 namespace Decentralized.Domain
 {
+    /// <summary>一次互换的报价：得到数量、经过几个池、相对中间价的损失（手续费加滑点）。</summary>
+    public sealed class SwapQuote
+    {
+        public string From, To;
+        public double In, Out, Impact;
+        public int Hops;
+    }
+
     /// <summary>
     /// 影响行情的游戏事件种类。接入层把游戏的新闻事件与派系行动映射到这里（例如全站停电、电力短缺 → Blackout）。
     /// </summary>
@@ -64,14 +72,43 @@ namespace Decentralized.Domain
             var m = new Market();
             double depth = Tuning.PoolDepth(day), p = Tuning.PscStartPrice;
             m.Pools.Add(Pool.Create(Venue.Exchange, Assets.PSC, Assets.CRC, p, depth, Tuning.ExchangeFee));
-            m.Pools.Add(Pool.Create(Venue.Dex, Assets.PSC, Assets.CRT, p, depth * SideDepthShare, Tuning.DexFee));
-            m.Pools.Add(Pool.Create(Venue.Dex, Assets.PSC, Assets.CRA, p, depth * SideDepthShare, Tuning.DexFee));
+            m.Pools.Add(Pool.Create(Venue.Dex, Assets.PSC, Assets.CRC, p, depth * SideDepthShare, Tuning.DexFee));
             m.Pools.Add(Pool.Create(Venue.Dex, Assets.CRT, Assets.CRC, 1, depth * SideDepthShare, Tuning.DexFee));
+            m.Pools.Add(Pool.Create(Venue.Dex, Assets.CRA, Assets.CRC, 1, depth * SideDepthShare, Tuning.DexFee));
+            m.Pools.Add(Pool.Create(Venue.Dex, Assets.SPARK, Assets.CRC, Tuning.SparkStart, depth * Tuning.SparkDepthShare, Tuning.DexFee));
             return m;
         }
 
         public Pool Main => Pools[0];
 
+        /// <summary>DEX 上 X/CRC 的池（所有币都以 CRC 计价）。</summary>
+        public Pool DexPool(string asset) => Find(Venue.Dex, asset, Assets.CRC);
+
+        /// <summary>
+        /// 任意两币互换的报价：CRC 在一端走一个池，否则 X → CRC → Y 两跳（两次手续费、滑点叠加）。
+        /// 不改池子；没有路由（同币、没有池）返回 null。
+        /// </summary>
+        public SwapQuote Quote(string from, string to, double amount)
+        {
+            if (from == to || amount <= 0) return null;
+            var a = from == Assets.CRC ? null : DexPool(from);
+            var b = to == Assets.CRC ? null : DexPool(to);
+            if ((from != Assets.CRC && a == null) || (to != Assets.CRC && b == null)) return null;
+            double crc = a == null ? amount : a.QuoteOut(amount);
+            double mid = a == null ? amount : amount * a.Price;
+            double outAmt = b == null ? crc : b.BaseOut(crc);
+            double ideal = b == null ? mid : mid / b.Price;
+            return new SwapQuote { From = from, To = to, In = amount, Out = outAmt, Hops = (a != null ? 1 : 0) + (b != null ? 1 : 0), Impact = ideal > 0 ? Math.Max(0, 1 - outAmt / ideal) : 0 };
+        }
+
+        /// <summary>成交：按 <see cref="Quote"/> 的路由改动池子，返回得到的数量（没有路由返回 0）。</summary>
+        public double Swap(string from, string to, double amount)
+        {
+            if (Quote(from, to, amount) == null) return 0;
+            double crc = from == Assets.CRC ? amount : DexPool(from).SellBase(amount);
+            return to == Assets.CRC ? crc : DexPool(to).BuyBase(crc);
+        }
+
         public Pool Find(Venue venue, string baseAsset, string quote) =>
             Pools.FirstOrDefault(x => x.Venue == venue && x.Base == baseAsset && x.Quote == quote);
 
@@ -152,7 +189,8 @@ namespace Decentralized.Domain
                 double baseCredits = pool.Base == Assets.PSC ? p : stablePrice(pool.Base);
                 double quoteCredits = pool.Quote == Assets.PSC ? p : stablePrice(pool.Quote);
                 if (quoteCredits <= 0) continue;
-                pool.Revert(baseCredits / quoteCredits, ArbRate, depth * SideDepthShare / quoteCredits);
+                double share = pool.Base == Assets.SPARK ? Tuning.SparkDepthShare : SideDepthShare;
+                pool.Revert(baseCredits / quoteCredits, ArbRate, depth * share / quoteCredits);
             }
         }
     }