from flask import Flask, request, jsonify
from app import generate_chat_completion
import time

app = Flask(__name__)

@app.route('/v1/chat/completions', methods=['POST'])
def chat_completions():
    data = request.json
    messages = data.get('messages')  # list of {"role":..., "content":...}
    if not messages or not isinstance(messages, list):
        return jsonify({"error": "A valid 'messages' list is required."}), 400

    try:
        start = time.time()
        new_history = generate_chat_completion(
            message=messages[-1]['content'],
            history=messages[:-1]  # feed all except last user message
        )
        assistant_msg = new_history[-1]['content']
        elapsed = time.time() - start

        return jsonify({
            "model": "tiiuae/falcon-rw-1b",
            "choices": [{
                "message": {"role": "assistant", "content": assistant_msg}
            }],
            "usage": {"generation_time": round(elapsed, 2)},
            "history": new_history
        })
    except Exception as e:
        return jsonify({"error": str(e)}), 500

@app.route('/')
def health_check():
    return "LLM API is running", 200

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8081)