From 5361f7fc29aef49bbe0dd566e791b85bded48e4c Mon Sep 17 00:00:00 2001
From: Your Name <your.email@example.com>
Date: Sun, 8 Feb 2026 23:16:18 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=BC=BA=E7=94=9F=E5=9B=BE=E5=A4=B1?=
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---
 app/(chat)/api/chat/route.ts | 79 ++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

diff --git a/app/(chat)/api/chat/route.ts b/app/(chat)/api/chat/route.ts
index 27964ad..23f8a49 100644
--- a/app/(chat)/api/chat/route.ts
+++ b/app/(chat)/api/chat/route.ts
@@ -1588,6 +1588,85 @@ export async function POST(request: Request) {
                   console.error(`[Chat API] ❌ Alibaba fallback model ${fallbackModelId} failed:`, fallbackError);
                 }
               }
+
+              if (!fallbackSuccess) {
+                const providerPriority: Record<string, number> = {
+                  "volcano-vision": 0,
+                  gemini: 1,
+                  "huanke-gemini": 2,
+                  "alibaba-image": 3,
+                  "ruxa-image": 4,
+                };
+                const crossProviderCandidates = allModels
+                  .filter((m) => {
+                    if (!m.model.supportsImageGen || !m.model.isEnabled || m.model.isSubModel) {
+                      return false;
+                    }
+                    if (m.model.id === finalModelId) return false;
+                    if (m.provider.id === alibabaModelConfig?.providerId) return false;
+                    return true;
+                  })
+                  .sort((a, b) => {
+                    const left = providerPriority[a.provider.type as string] ?? 99;
+                    const right = providerPriority[b.provider.type as string] ?? 99;
+                    if (left !== right) return left - right;
+                    return (a.model.sortOrder ?? 0) - (b.model.sortOrder ?? 0);
+                  });
+
+                for (const candidate of crossProviderCandidates) {
+                  try {
+                    console.log(
+                      `[Chat API] 🔁 Cross-provider failover attempt: ${candidate.model.displayName} (${candidate.provider.type})`
+                    );
+
+                    const candidateLanguageModel = await getLanguageModelById(candidate.model.id);
+                    if (!candidateLanguageModel || typeof (candidateLanguageModel as any).doGenerate !== "function") {
+                      console.log(`[Chat API] Skip candidate without doGenerate: ${candidate.model.id}`);
+                      continue;
+                    }
+
+                    const convertProvider =
+                      candidate.provider.type === "ruxa-image"
+                        ? "ruxa-image"
+                        : candidate.provider.type === "gemini"
+                          ? "gemini"
+                          : candidate.provider.type === "huanke-gemini"
+                            ? "huanke-gemini"
+                            : candidate.provider.type === "volcano-vision"
+                              ? "volcano"
+                              : "alibaba-image";
+
+                    const candidateMessages = await convertMessagesWithImages(
+                      messagesForAlibaba,
+                      convertProvider
+                    );
+
+                    const candidateResult = await (candidateLanguageModel as any).doGenerate({
+                      messages: candidateMessages,
+                      imageParams: requestBody.imageParams || { aspectRatio: "auto", imageSize: "2K", imageCount: 1 },
+                      modelDisplayName: candidate.model.displayName,
+                      overrideModelId: candidate.model.modelId,
+                    });
+
+                    if (candidateResult?.finishReason === "error") {
+                      throw new Error(candidateResult.text || "图片生成失败");
+                    }
+
+                    imageMarkdown = candidateResult.text || "图片生成失败";
+                    usedModelId = candidate.model.modelId;
+                    fallbackSuccess = true;
+                    console.log(
+                      `[Chat API] ✅ Cross-provider failover succeeded: ${candidate.model.displayName} (${candidate.provider.type})`
+                    );
+                    break;
+                  } catch (crossError) {
+                    console.error(
+                      `[Chat API] ❌ Cross-provider failover failed: ${candidate.model.displayName} (${candidate.provider.type})`,
+                      crossError
+                    );
+                  }
+                }
+              }
               
               if (!fallbackSuccess) {
                 throw primaryError;