Update utils/llm.py

utils/llm.py

@@ -0,0 +1,26 @@
+from openai import OpenAI
+
+
+def chat_stream(history: list[dict], api_key: str, system: str = "", model: str = "gpt-4o-mini"):
+    """Streaming chat. Yields text chunks. history = [{"role": ..., "content": ...}]"""
+    if not api_key or not api_key.strip().startswith("sk-"):
+        raise ValueError("Nieprawidłowy klucz API. Klucz OpenAI powinien zaczynać się od 'sk-'.")
+
+    client = OpenAI(api_key=api_key.strip())
+
+    messages = []
+    if system:
+        messages.append({"role": "system", "content": system})
+    messages.extend(history)
+
+    stream = client.chat.completions.create(
+        model=model,
+        messages=messages,
+        max_tokens=1000,
+        temperature=0.7,
+        stream=True,
+    )
+    for chunk in stream:
+        delta = chunk.choices[0].delta.content or ""
+        if delta:
+            yield delta