feat(app): complete playable branch sessions

src/app/turnAdapter.ts

@@ -8,6 +8,7 @@ import type {
 } from "@contracts";
 
 const DEMO_LATENCY_MS = 120;
+type DemoPhase = "promise" | "investigate" | "enter" | "return" | "regular";
 
 function nextNodeId(currentNodeId: string): string {
   const match = currentNodeId.match(/^(.*?)(\d+)$/);
@@ -17,7 +18,134 @@ function nextNodeId(currentNodeId: string): string {
   return `${prefix}${String(Number(digits) + 1).padStart(digits.length, "0")}`;
 }
 
-function replyBeats(request: TurnRequest): PresentationBeat[] {
+function demoPhase(request: TurnRequest, currentView: PlayerView): DemoPhase {
+  if (
+    request.input.includes("天亮前") &&
+    request.input.includes("回来") &&
+    !currentView.promises.some((promise) => promise.status === "accepted")
+  ) {
+    return "promise";
+  }
+  if (currentView.history.some((node) => node.label === "进入封锁隧道")) return "return";
+  if (currentView.knowledge.some((record) => record.id.startsWith("knowledge_maintenance_door"))) {
+    return "enter";
+  }
+  if (currentView.promises.some((promise) => promise.status === "accepted")) return "investigate";
+  return "regular";
+}
+
+function replyBeats(request: TurnRequest, phase: DemoPhase): PresentationBeat[] {
+  if (phase === "promise") {
+    return [
+      {
+        id: `${request.actionId}_player`,
+        kind: "action",
+        speaker: "你",
+        text: request.input,
+        visual: null
+      },
+      {
+        id: `${request.actionId}_nana`,
+        kind: "dialogue",
+        speaker: "娜娜",
+        text: "娜娜看了你一会儿，终于松开攥紧外套的手。“好。我等你到天亮。”",
+        visual: {
+          character: "nana",
+          expression: "relieved",
+          pose: "holding_coat",
+          scene: null
+        }
+      }
+    ];
+  }
+
+  if (phase === "investigate") {
+    return [
+      {
+        id: `${request.actionId}_search`,
+        kind: "narration",
+        speaker: null,
+        text: "你打开旧手电，沿着站台边缘寻找。斜光扫过积水，一道检修门和半张旧车票显了出来。",
+        visual: {
+          character: null,
+          expression: null,
+          pose: null,
+          scene: "station_maintenance_door"
+        }
+      },
+      {
+        id: `${request.actionId}_nana`,
+        kind: "dialogue",
+        speaker: "娜娜",
+        text: "“这是我妹妹的字。门后通向封锁隧道。”",
+        visual: {
+          character: "nana",
+          expression: "startled",
+          pose: "reaching_out",
+          scene: null
+        }
+      }
+    ];
+  }
+
+  if (phase === "enter") {
+    return [
+      {
+        id: `${request.actionId}_door`,
+        kind: "narration",
+        speaker: null,
+        text: "检修门在肩膀的撞击下松开。手电光照见没过鞋面的水和向深处延伸的脚印。",
+        visual: {
+          character: null,
+          expression: null,
+          pose: null,
+          scene: "sealed_tunnel"
+        }
+      },
+      {
+        id: `${request.actionId}_nana`,
+        kind: "dialogue",
+        speaker: "娜娜",
+        text: "“我留在这里。你答应过会回来，所以我等。”",
+        visual: {
+          character: "nana",
+          expression: "determined",
+          pose: "at_door",
+          scene: null
+        }
+      }
+    ];
+  }
+
+  if (phase === "return") {
+    return [
+      {
+        id: `${request.actionId}_return`,
+        kind: "narration",
+        speaker: null,
+        text: "天色发白前，你重新推开检修门。娜娜仍坐在原处。",
+        visual: {
+          character: "nana",
+          expression: "disbelieving",
+          pose: "waiting",
+          scene: "station_before_dawn"
+        }
+      },
+      {
+        id: `${request.actionId}_nana`,
+        kind: "dialogue",
+        speaker: "娜娜",
+        text: "“你回来了。那我也会把剩下的事告诉你。”",
+        visual: {
+          character: "nana",
+          expression: "relieved",
+          pose: "lowered_guard",
+          scene: null
+        }
+      }
+    ];
+  }
+
   if (request.intent === "continue") {
     return [
       {
@@ -78,8 +206,58 @@ export async function submitDemoTurn(
 
   const committedNodeId = nextNodeId(currentView.nodeId);
   const previousHistory = currentView.history.map((node) => ({ ...node, isCurrent: false }));
-  const beats = replyBeats(request);
+  const phase = demoPhase(request, currentView);
+  const beats = replyBeats(request, phase);
   const finalVisual = [...beats].reverse().find((beat) => beat.visual)?.visual;
+  const historyLabel = {
+    promise: "天亮前的许诺",
+    investigate: "检修门的线索",
+    enter: "进入封锁隧道",
+    return: "天亮前归来",
+    regular: request.intent === "continue" ? "雨声中的停顿" : "回应娜娜"
+  }[phase];
+  const promises =
+    phase === "promise"
+      ? [
+          ...currentView.promises,
+          {
+            id: `promise_return_before_dawn_${request.actionId}`,
+            content: "天亮前一定回来",
+            status: "accepted" as const,
+            weight: "major" as const
+          }
+        ]
+      : phase === "return"
+        ? currentView.promises.map((promise) =>
+            promise.status === "accepted" ? { ...promise, status: "fulfilled" as const } : promise
+          )
+        : currentView.promises;
+  const knowledge =
+    phase === "investigate"
+      ? [
+          ...currentView.knowledge,
+          {
+            id: `knowledge_maintenance_door_${request.actionId}`,
+            title: "封锁隧道的检修门",
+            summary: "旧站台下方的检修门通向封锁隧道，妹妹留下的车票指向四点十七分。",
+            certainty: "confirmed" as const
+          }
+        ]
+      : currentView.knowledge;
+  const inventory =
+    phase === "investigate"
+      ? [
+          ...currentView.inventory,
+          {
+            instanceId: `item_half_ticket_${request.actionId}`,
+            name: "半张旧车票",
+            description: "受潮的车票背面写着“四点十七分，检修线”。",
+            quantity: 1,
+            placement: "bag" as const,
+            condition: "damp"
+          }
+        ]
+      : currentView.inventory;
 
   return {
     committedNodeId,
@@ -89,13 +267,18 @@ export async function submitDemoTurn(
       characterExpression: finalVisual?.expression ?? currentView.characterExpression,
       characterPose: finalVisual?.pose ?? currentView.characterPose,
       beats: [...currentView.beats, ...beats].slice(-8),
+      promises,
+      knowledge,
+      inventory,
+      suggestions: phase === "return" ? [] : currentView.suggestions,
+      canContinue: phase !== "return",
       history: [
         ...previousHistory,
         {
           id: committedNodeId,
           parentId: currentView.nodeId,
           branchId: currentView.branchId,
-          label: request.intent === "continue" ? "雨声中的停顿" : "回应娜娜",
+          label: historyLabel,
           isCurrent: true
         }
       ]