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refactor(battle-node): extract SwapHandler (mulligan barrier)

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gamer147
2026-06-03 14:13:26 -04:00
parent 3e2931b085
commit 477faf3df3
2 changed files with 40 additions and 0 deletions
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1
SVSim.BattleNode/Sessions/BattleSession.cs
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@@ -39,6 +39,7 @@ public sealed class BattleSession
[NetworkBattleUri.InitNetwork] = new InitNetworkHandler(),
[NetworkBattleUri.InitBattle] = new InitBattleHandler(),
[NetworkBattleUri.Loaded] = new LoadedHandler(),
[NetworkBattleUri.Swap] = new SwapHandler(),
};
private FrameDispatchContext BuildContext(IBattleParticipant from, MsgEnvelope env) =>

39
SVSim.BattleNode/Sessions/Dispatch/Handlers/SwapHandler.cs Normal file
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@@ -0,0 +1,39 @@
using SVSim.BattleNode.Lifecycle;
using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Sessions.Participants; // IHasHandshakePhase
namespace SVSim.BattleNode.Sessions.Dispatch.Handlers;
internal sealed class SwapHandler : IFrameHandler
{
public IReadOnlyList<DispatchRoute> Handle(FrameDispatchContext ctx)
{
if (ctx.SenderPhase != BattleSessionPhase.AwaitingSwap)
return Array.Empty<DispatchRoute>();
var routes = new List<DispatchRoute>();
var hand = ScriptedLifecycle.ComputeHandAfterSwap(BattleFrames.ExtractIdxList(ctx.Env));
// SwapResponse is always immediate — completes the sender's own mulligan UI.
routes.Add(new DispatchRoute(ctx.From, ScriptedLifecycle.BuildSwapResponse(hand), false));
ctx.State.PostSwapHands[ctx.From] = hand;
ctx.SenderPhase = BattleSessionPhase.AfterReady;
// Release Ready to every swapper once all handshake-driving participants have swapped.
// IHasHandshakePhase membership IS the "participates in mulligan" set.
var swappers = new[] { ctx.A, ctx.B }.Where(p => p is IHasHandshakePhase).ToList();
if (swappers.All(ctx.State.PostSwapHands.ContainsKey))
{
foreach (var p in swappers)
{
var opponent = ReferenceEquals(p, ctx.A) ? ctx.B : ctx.A;
var ready = opponent is IHasHandshakePhase
&& ctx.State.PostSwapHands.TryGetValue(opponent, out var oppoHand)
? ScriptedLifecycle.BuildReady(ctx.State.PostSwapHands[p], oppoHand)
: ScriptedLifecycle.BuildReady(ctx.State.PostSwapHands[p]);
routes.Add(new DispatchRoute(p, ready, false));
}
}
return routes;
}
}