From add860bceba464ceb260e52a9896c6be33d288da Mon Sep 17 00:00:00 2001
From: araharah-executor <executor@araharah.local>
Date: Sun, 25 Oct 2026 04:02:31 +0800
Subject: [PATCH] =?UTF-8?q?fix(07-02):=20refuse=20<2-point=20geometries=20?=
 =?UTF-8?q?before=20the=20draw=20path=20=E2=80=94=20pending=20card=20/=20r?=
 =?UTF-8?q?eroute-failed=20(T-07-12,=20FM4)?=
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- consult filters degenerate options (geometry.points < 2) into the pending-card class
- reroute ladder: no drawable option = the honest reroute-failed degradation, never a half-drawn snap-in
- GREEN for FM4; web suite 165/165, typecheck clean
---
 web/src/route/route.ts | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/web/src/route/route.ts b/web/src/route/route.ts
index 65e8256..b334407 100644
--- a/web/src/route/route.ts
+++ b/web/src/route/route.ts
@@ -225,13 +225,19 @@ export function createRouteController(deps: RouteControllerDeps): {
     const result: RouteResult | null = await deps.source
       .route({ origin: { lat: fix.lat, lng: fix.lng }, destinationId: destination.id })
       .catch(() => null); // T-05-04: an exception renders pending — never a half-drawn line
-    if (result === null || result.options.length === 0) {
+    // T-07-12 (FM4, 07-02): a geometry decoding to fewer than two points is
+    // refused BEFORE the draw path — the degenerate option is dropped with
+    // the empty-answer class, so the pending card renders instead of a
+    // half-drawn line (the same law main.ts already applies to the ?g=
+    // envelope's decoded polyline).
+    const usable = result === null ? [] : result.options.filter((option) => option.geometry.points.length >= 2);
+    if (result === null || usable.length === 0) {
       deps.showRouteCard(deps.buildPendingCard(deps.locale, { onSearchAgain: () => walkBack() }), "center");
       setState("pending");
       console.log("ARAHARAH-ROUTE state=pending");
       return;
     }
-    options = result.options;
+    options = usable;
     selectedIndex = 0;
     drawSelection();
     setState("route");
@@ -443,14 +449,16 @@ export function createRouteController(deps: RouteControllerDeps): {
       result = null; // fail-honest (T-05-04, network edition)
     }
     if (guidance !== g || g.ended) return; // the trip ended mid-request — drop it
-    if (result === null || result.options.length === 0) {
+    // T-07-12 (FM4, 07-02): the same no-geometry law on the reroute ladder —
+    // an answer with no drawable (>= 2-point) option is the honest
+    // reroute-failed degradation, never a half-drawn snap-in.
+    const option = result === null ? undefined : result.options.find((o) => o.geometry.points.length >= 2);
+    if (option === undefined || result === null) {
       g.snap = stepGuidance(g.snap, { type: "reroute-failed" }, now()).snap;
       logGuideState(g.snap.state);
       renderCockpit();
       return;
     }
-    const option = result.options[0];
-    if (option === undefined) return;
     const model: GuidanceRouteModel = {
       points: option.geometry.points,
       cumulative: option.geometry.cumulativeDistanceM,