为城市详情接口添加摘要回退响应

frontend/app/api/city/[name]/route.ts

@@ -6,6 +6,97 @@ import {
 
 const API_BASE = process.env.POLYWEATHER_API_BASE_URL;
 
+function buildFallbackCityDetail(name: string, depth: string, summary: Record<string, any>) {
+  const nowIso = new Date().toISOString();
+  return {
+    detail_depth: depth,
+    name,
+    display_name: summary?.display_name || name,
+    lat: 0,
+    lon: 0,
+    utc_offset_seconds: summary?.utc_offset_seconds ?? null,
+    temp_symbol: summary?.temp_symbol || "°C",
+    local_time: summary?.local_time || "--:--",
+    local_date: nowIso.slice(0, 10),
+    risk: {
+      level: summary?.risk?.level || "medium",
+      warning: summary?.risk?.warning || null,
+      airport: summary?.display_name || name,
+      icao: summary?.icao || null,
+    },
+    current: {
+      temp: summary?.current?.temp ?? null,
+      max_so_far: summary?.current?.temp ?? null,
+      max_temp_time: summary?.current?.obs_time || null,
+      wu_settlement: null,
+      settlement_source: summary?.current?.settlement_source || null,
+      settlement_source_label: summary?.current?.settlement_source_label || null,
+      station_code: summary?.icao || null,
+      station_name: summary?.display_name || name,
+      obs_time: summary?.current?.obs_time || null,
+      obs_age_min: null,
+      observation_status: "missing",
+      wind_speed_kt: null,
+      wind_dir: null,
+      humidity: null,
+      cloud_desc: null,
+      clouds_raw: [],
+      visibility_mi: null,
+      wx_desc: null,
+      raw_metar: null,
+      report_time: null,
+      receipt_time: null,
+      obs_time_epoch: null,
+    },
+    deb: {
+      prediction: summary?.deb?.prediction ?? null,
+    },
+    deviation_monitor: summary?.deviation_monitor || {},
+    forecast: {
+      today_high: null,
+      daily: [],
+      sunrise: null,
+      sunset: null,
+      sunshine_hours: null,
+    },
+    multi_model: {},
+    probabilities: {
+      mu: null,
+      distribution: [],
+      distribution_all: [],
+      engine: "legacy",
+      calibration_mode: "legacy",
+      calibration_version: null,
+      raw_mu: null,
+      raw_sigma: null,
+      calibrated_mu: null,
+      calibrated_sigma: null,
+      shadow_distribution: [],
+      shadow_distribution_all: [],
+    },
+    trend: {
+      direction: "unknown",
+      recent: [],
+      is_cooling: false,
+      is_dead_market: false,
+    },
+    peak: {
+      hours: [],
+      first_h: null,
+      last_h: null,
+      status: "unknown",
+    },
+    dynamic_commentary: {
+      summary: "",
+      notes: [],
+    },
+    market_scan: null,
+    intraday_meteorology: null,
+    updated_at: summary?.updated_at || nowIso,
+    fallback_source: "summary",
+  };
+}
+
 export async function GET(
   req: NextRequest,
   context: { params: Promise<{ name: string }> },
@@ -33,6 +124,22 @@ export async function GET(
     });
     if (!res.ok) {
       const raw = await res.text();
+      const summaryUrl = `${API_BASE}/api/city/${encodeURIComponent(name)}/summary?force_refresh=${forceRefresh}`;
+      const summaryRes = await fetch(summaryUrl, {
+        headers: auth.headers,
+        cache: "no-store",
+      });
+      if (summaryRes.ok) {
+        const summaryData = await summaryRes.json();
+        const response = NextResponse.json(buildFallbackCityDetail(name, depth, summaryData), {
+          headers: {
+            "Cache-Control": "no-store",
+            "X-PolyWeather-Fallback": "summary",
+          },
+        });
+        return applyAuthResponseCookies(response, auth.response);
+      }
+
       const response = NextResponse.json(
         { error: `Backend returned ${res.status}`, detail: raw.slice(0, 300) },
         { status: 502 },