from flask import Flask, request, Response, jsonify
from llama_cpp import Llama

app = Flask(__name__)

# Load the model
print("🔄 Loading model...")
llm = Llama.from_pretrained(
    repo_id="bartowski/google_gemma-3-1b-it-GGUF",
    filename="google_gemma-3-1b-it-IQ4_XS.gguf",
    n_ctx=2048
)
print("✅ Model loaded!")

@app.route("/")
def home():
    print("📢 Serving index.html")
    return render_template("index.html")


def generate_response(user_input):
    """Generator function to stream model output"""
    try:
        response = llm.create_chat_completion(
            messages=[{"role": "user", "content": user_input}],
            stream=True  # Enable streaming
        )

        for chunk in response:
            if "choices" in chunk and len(chunk["choices"]) > 0:
                token = chunk["choices"][0]["delta"].get("content", "")
                if token:
                    print(f"📝 Token: {token}", flush=True)  # Debugging
                    yield token

    except Exception as e:
        print(f"❌ Error generating response: {e}")
        yield "[Error occurred]"


@app.route("/chat", methods=["POST"])
def chat():
    user_input = request.json.get("message", "")
    if not user_input:
        return jsonify({"error": "Empty input"}), 400

    return Response(generate_response(user_input), content_type="text/plain")


if __name__ == "__main__":
    app.run(host="0.0.0.0", port=7860, debug=True)