import logging
from flask import Flask, request, jsonify
from transformers import pipeline
import gradio as gr
import os
import torch
from huggingface_hub import login

# Cấu hình logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')

# Đăng nhập Hugging Face
try:
    login(token=os.getenv("HF_TOKEN"))
    logging.info("Logged in to Hugging Face Hub successfully")
except Exception as e:
    logging.error(f"Failed to login to Hugging Face Hub: {e}")
    raise

app = Flask(__name__)

# Load mô hình
logging.info("Loading nguyenvulebinh/vi-mrc-base...")
try:
    qa_pipeline = pipeline(
        "question-answering",
        model="nguyenvulebinh/vi-mrc-base",
        device=0 if torch.cuda.is_available() else -1
    )
    logging.info("Model loaded successfully")
except Exception as e:
    logging.error(f"Failed to load model: {e}")
    raise

# Giao diện Gradio
def gradio_answer(question, context):
    result = qa_pipeline(question=question, context=context)
    return result["answer"]

iface = gr.Interface(
    fn=gradio_answer,
    inputs=["text", "text"],
    outputs="text",
    title="AgriBot: Hỏi đáp nông nghiệp",
    description="Nhập câu hỏi và ngữ cảnh để nhận câu trả lời về nông nghiệp."
)

# Endpoint API
@app.route("/api/answer", methods=["POST"])
def answer():
    try:
        data = request.json
        question = data.get("question")
        context = data.get("context")
        logging.info(f"Received request - Question: {question}, Context: {context[:200]}...")
        if not question or not context:
            logging.error("Missing question or context")
            return jsonify({"error": "Missing question or context"}), 400
        result = qa_pipeline(question=question, context=context)
        logging.info(f"Response - Answer: {result['answer']}")
        return jsonify({"answer": result["answer"]})
    except Exception as e:
        logging.error(f"API error: {e}")
        return jsonify({"error": str(e)}), 500

# Health check
@app.route("/", methods=["GET"])
def health_check():
    return jsonify({"status": "API is running, use /api/answer for API or Gradio interface"}), 200

# Phục vụ Gradio ở root
@app.route("/", methods=["GET", "POST"])
@app.route("/<path:path>", methods=["GET", "POST"])
def serve_gradio(path=None):
    return iface.__call__(request)

if __name__ == "__main__":
    logging.info("Starting Flask and Gradio app on port 7860...")
    logging.info(f"Registered routes: {app.url_map}")
    app.run(host="0.0.0.0", port=7860)