Fix bot: add debug logging, improve API response handling

bot.js

@@ -14,6 +14,9 @@ if (!ZEN_API_KEY) {
   process.exit(1);
 }
 
+console.log("[CONFIG] CHAT_ID filter:", CHAT_ID || "DISABLED (accepting all chats)");
+console.log("[CONFIG] Zen API Key:", ZEN_API_KEY ? ZEN_API_KEY.substring(0, 12) + "..." : "NOT SET");
+
 const ZEN_BASE = "https://opencode.ai/zen/v1";
 const bot = new Bot(BOT_TOKEN);
 
@@ -45,6 +48,8 @@ async function callZenAPI(messages, modelId) {
     body = { model: modelId, messages, max_tokens: 4096 };
   }
 
+  console.log("[API] Calling:", endpoint, "model:", modelId);
+
   const response = await fetch(endpoint, {
     method: "POST",
     headers,
@@ -53,19 +58,26 @@ async function callZenAPI(messages, modelId) {
 
   if (!response.ok) {
     const errText = await response.text();
+    console.error("[API ERROR]", response.status, errText.substring(0, 500));
     throw new Error(`API ${response.status}: ${errText.substring(0, 300)}`);
   }
 
   const data = await response.json();
+  console.log("[API] Response keys:", Object.keys(data));
 
+  // Handle /messages format (Anthropic-style)
   if (data.content) {
-    return data.content.map((c) => c.text || "").join("");
+    const result = data.content.map((c) => c.text || "").join("");
+    if (result.trim()) return result;
   }
+  // Handle /chat/completions format (OpenAI-style)
   if (data.choices && data.choices[0]) {
     const msg = data.choices[0].message;
     if (msg.content && msg.content.trim()) return msg.content;
-    if (msg.reasoning_content && msg.reasoning_content.trim()) return msg.reasoning_content;
-    return "(empty response - try another model)";
+    if (msg.reasoning_content && msg.reasoning_content.trim()) {
+      return msg.reasoning_content;
+    }
+    return "(empty response from model - try another model)";
   }
   return JSON.stringify(data).substring(0, 2000);
 }
@@ -73,6 +85,7 @@ async function callZenAPI(messages, modelId) {
 // /start
 bot.command("start", async (ctx) => {
   const chatId = ctx.chat.id;
+  console.log("[LOG] /start from chat:", chatId, "type:", ctx.chat.type);
   if (CHAT_ID && chatId.toString() !== CHAT_ID.toString()) return;
 
   userSessions.set(chatId, { model: "deepseek-v4-flash-free", history: [] });
@@ -164,8 +177,11 @@ bot.on("message:text", async (ctx) => {
   const chatId = ctx.chat.id;
   const message = ctx.message.text;
 
+  console.log("[LOG] Message from chat:", chatId, "type:", ctx.chat.type, "text:", message.substring(0, 50));
+
   // Check allowed chat
   if (CHAT_ID && chatId.toString() !== CHAT_ID.toString()) {
+    console.log("[BLOCKED] Chat", chatId, "not in allowed list. CHAT_ID:", CHAT_ID);
     await ctx.reply("Sorry, I'm only available in the designated group.");
     return;
   }
@@ -203,7 +219,7 @@ bot.on("message:text", async (ctx) => {
       await ctx.reply(response);
     }
   } catch (error) {
-    console.error("[ERROR]", error.message);
+    console.error("[ERROR] Chat API failed:", error.message);
     await ctx.reply(`❌ Error: ${error.message}`);
   }
 });