add kia ai chat tools3

src/services/chatbot.py

@@ -56,7 +56,8 @@ async def web_search_tool(query: str) -> str:
 
 def get_model(model: str):
     if model.startswith("kia/"):
-        return get_kia_model(model)
+        # KIA models use KiaAIService.invoke() directly in call_model — no LangChain model needed
+        return None
 
     if "claude" in model:
         # return ChatAnthropic(model=model, api_key=settings.anthropic_api_key)
@@ -176,10 +177,10 @@ def chatbot_workflow(bot, now):
     print(f"[chatbot_workflow] START | model='{bot.model}' | is_kia={is_kia_model} | web_search={bot.web_search}")
 
     model = get_model(model=bot.model)
-    print(f"[chatbot_workflow] Model initialized: {type(model).__name__}")
+    print(f"[chatbot_workflow] Model initialized: {type(model).__name__ if model else 'KiaAIService (direct http)'}")
     trimmer = get_trimmer()
 
-    if bot.web_search:
+    if bot.web_search and model is not None:
         model = model.bind_tools([web_search_tool])
 
     async def call_model(state: MessagesState):
@@ -203,12 +204,14 @@ def chatbot_workflow(bot, now):
                              )
                          ] + trimmed_messages
 
-        # KIA API returns choices=null in streaming chunks which breaks LangChain.
-        # Even with streaming=False, ainvoke() still uses _astream() internally in async path.
-        # asyncio.to_thread forces sync model.invoke() which calls the real non-streaming endpoint.
+        # KIA models must bypass LangChain entirely:
+        # both ainvoke() and invoke() internally use _astream()/_stream() in this
+        # version of LangChain which fails on KIA's choices=null streaming chunks.
+        # Direct httpx call is the only reliable path.
         if is_kia:
-            print(f"[KiaAI] Calling model via asyncio.to_thread (non-streaming) | model='{bot.model}'")
-            response = await asyncio.to_thread(model.invoke, input_messages)
+            from .kiaai import KiaAIService
+            print(f"[KiaAI] Calling via KiaAIService.invoke() | model='{bot.model}'")
+            response = await KiaAIService().invoke(model=bot.model, messages=input_messages)
         else:
             response = await model.ainvoke(input=input_messages, **kwargs)
 

src/services/kiaai/chat.py

@@ -1,80 +1,101 @@
-from langchain_openai import ChatOpenAI
+import httpx
+from langchain_core.messages import (
+    AIMessage,
+    BaseMessage,
+    HumanMessage,
+    SystemMessage,
+    ToolMessage,
+)
 
 from ...config import settings
 
 KIA_BASE_URL = "https://api.kie.ai"
 
-# Models that support reasoning_effort parameter
-REASONING_MODELS = {"gpt-5-2", "claude-sonnet-4-5", "claude-opus-4-5", "gemini-3-pro", "gemini-2.5-flash","gemini-2.5-pro"}
+
+def _to_openai_messages(messages: list[BaseMessage]) -> list[dict]:
+    """Convert LangChain messages to OpenAI-compatible dict format."""
+    result = []
+    for msg in messages:
+        if isinstance(msg, SystemMessage):
+            result.append({"role": "system", "content": msg.content})
+        elif isinstance(msg, HumanMessage):
+            result.append({"role": "user", "content": msg.content})
+        elif isinstance(msg, AIMessage):
+            result.append({"role": "assistant", "content": msg.content})
+        elif isinstance(msg, ToolMessage):
+            result.append({"role": "tool", "content": msg.content, "tool_call_id": msg.tool_call_id})
+        else:
+            result.append({"role": "user", "content": str(msg.content)})
+    return result
 
 
 class KiaAIService:
     """
-    Service for interacting with KIA AI models via OpenAI-compatible API.
+    Service for calling KIA AI models directly via httpx (non-streaming).
 
-    KIA AI endpoint pattern:
-        https://api.kie.ai/{modelName}/v1/chat/completions
+    Bypasses LangChain's streaming infrastructure entirely to avoid the
+    'TypeError: object of type NoneType has no len()' bug caused by
+    KIA API returning chunks with choices=null.
 
-    Usage:
-        service = KiaAIService()
-        model = service.get_model("kia/gpt-4o")
-        model = service.get_model("kia/o3", reasoning_effort="high")
+    Endpoint pattern:
+        POST https://api.kie.ai/{modelName}/v1/chat/completions
     """
 
-    def get_model(
-        self,
-        model: str,
-        reasoning_effort: str | None = None,
-    ) -> ChatOpenAI:
+    async def invoke(self, model: str, messages: list[BaseMessage]) -> AIMessage:
         """
-        Returns a LangChain-compatible ChatOpenAI model configured for KIA AI API.
+        Call KIA API directly and return an AIMessage.
 
         Args:
-            model: Model identifier with optional 'kia/' prefix
-                   (e.g. 'kia/gpt-4o', 'kia/claude-3-5-sonnet', 'kia/o3')
-            reasoning_effort: Reasoning effort level for supported models.
-                              One of: 'low', 'medium', 'high'
+            model: Model name with optional 'kia/' prefix (e.g. 'kia/gpt-5-2')
+            messages: List of LangChain BaseMessage objects
 
         Returns:
-            ChatOpenAI instance pointing to https://api.kie.ai/{modelName}/v1
+            AIMessage with content and usage_metadata populated
         """
         model_name = model.removeprefix("kia/")
-        base_url = f"{KIA_BASE_URL}/{model_name}/v1"
+        url = f"{KIA_BASE_URL}/{model_name}/v1/chat/completions"
 
-        model_kwargs: dict = {}
+        payload = {
+            "model": model_name,
+            "messages": _to_openai_messages(messages),
+            "stream": False,
+        }
 
-        # Add reasoning_effort for models that support it
-        if reasoning_effort and model_name in REASONING_MODELS:
-            model_kwargs["reasoning_effort"] = reasoning_effort
+        print(f"[KiaAI] POST {url} | messages_count={len(messages)}")
 
-        print(f"[KiaAI] Initializing model='{model_name}' | base_url='{base_url}' | reasoning_effort='{reasoning_effort}'")
+        async with httpx.AsyncClient(timeout=180.0) as client:
+            resp = await client.post(
+                url,
+                json=payload,
+                headers={
+                    "Authorization": f"Bearer {settings.kia_api_key}",
+                    "Content-Type": "application/json",
+                },
+            )
 
-        # streaming=False is REQUIRED: KIA API returns chunks with choices=null
-        # which causes TypeError in LangChain's _convert_chunk_to_generation_chunk.
-        # Disabling streaming forces LangChain to use the non-streaming endpoint.
-        return ChatOpenAI(
-            model=model_name,
-            api_key=settings.kia_api_key,
-            base_url=base_url,
-            model_kwargs=model_kwargs,
-            streaming=False,
-        )
+            print(f"[KiaAI] HTTP {resp.status_code}")
+            resp.raise_for_status()
+            data = resp.json()
+
+        print(f"[KiaAI] Raw response keys: {list(data.keys())}")
+
+        content = data["choices"][0]["message"]["content"]
+        usage = data.get("usage") or {}
+
+        print(f"[KiaAI] content='{content[:200]}'")
+        print(f"[KiaAI] usage={usage}")
+
+        ai_msg = AIMessage(content=content)
+        ai_msg.usage_metadata = {
+            "input_tokens": usage.get("prompt_tokens", 0),
+            "output_tokens": usage.get("completion_tokens", 0),
+            "total_tokens": usage.get("total_tokens", 0),
+        }
+
+        return ai_msg
 
 
-def get_kia_model(
-    model: str,
-    reasoning_effort: str | None = None,
-) -> ChatOpenAI:
-    """
-    Convenience function to get a KIA AI LangChain model instance.
-
-    Args:
-        model: Model identifier with optional 'kia/' prefix
-               (e.g. 'kia/gpt-4o', 'kia/o3')
-        reasoning_effort: Optional reasoning effort ('low', 'medium', 'high')
-
-    Returns:
-        ChatOpenAI configured for KIA AI API
-    """
-    service = KiaAIService()
-    return service.get_model(model=model, reasoning_effort=reasoning_effort)
+# Keep get_kia_model for compatibility — but actual chat calls should use KiaAIService.invoke()
+def get_kia_model(model: str):
+    """Compatibility stub — returns None for KIA models since they use direct HTTP."""
+    return None