feat: v0.8.0 — player-actions API: accept/dispatch/buy/sell/refuel endpoints (tick-first, full-snapshot responses), spawn coverage rule, test create-contract hook

app/api/market/buy-plane/route.ts

@@ -0,0 +1,31 @@
+import { buyPlane, performAction } from '@/lib/game/actions';
+
+// POST /api/market/buy-plane (v0.8.0) — body { model: string }. Buys a catalog
+// aircraft at full price; it arrives 'available' with a full tank at the home base
+// (EDDF). 400 missing/non-string model or unknown catalog model; 409 insufficient
+// funds. On success returns the full state snapshot (new plane + reduced cash).
+
+export async function POST(req: Request) {
+  let body: unknown;
+  try {
+    const text = await req.text();
+    body = text ? JSON.parse(text) : {};
+  } catch {
+    return Response.json({ error: 'invalid JSON body' }, { status: 400 });
+  }
+  if (typeof body !== 'object' || body === null || Array.isArray(body)) {
+    return Response.json({ error: 'body must be a JSON object' }, { status: 400 });
+  }
+  const input = body as Record<string, unknown>;
+  for (const key of Object.keys(input)) {
+    if (key !== 'model') {
+      return Response.json({ error: `unknown field "${key}"` }, { status: 400 });
+    }
+  }
+  if (typeof input.model !== 'string' || input.model.length === 0) {
+    return Response.json({ error: 'model must be a non-empty string' }, { status: 400 });
+  }
+
+  const model = input.model;
+  return performAction((inst) => buyPlane(inst, model));
+}