"""
ClauseGuard — Export fine-tuned Legal-BERT to ONNX for fast inference.
Requires: pip install optimum[onnxruntime]
"""

import os
import sys

MODEL_PATH = os.environ.get("MODEL_PATH", "./clauseguard-model/final")
ONNX_OUTPUT = os.environ.get("ONNX_OUTPUT", "./clauseguard-model-onnx")

print(f"📦 Exporting {MODEL_PATH} → ONNX at {ONNX_OUTPUT}")

try:
    from optimum.onnxruntime import ORTModelForSequenceClassification
    from transformers import AutoTokenizer

    # Load PyTorch model and export to ONNX
    model = ORTModelForSequenceClassification.from_pretrained(MODEL_PATH, export=True)
    tokenizer = AutoTokenizer.from_pretrained(MODEL_PATH)

    # Save ONNX model + tokenizer + config
    model.save_pretrained(ONNX_OUTPUT)
    tokenizer.save_pretrained(ONNX_OUTPUT)

    print(f"✅ ONNX model saved to {ONNX_OUTPUT}")
    print(f"   Files: {os.listdir(ONNX_OUTPUT)}")

    # Verify inference works
    from transformers import pipeline
    classifier = pipeline("text-classification", model=model, tokenizer=tokenizer, top_k=None)
    test = classifier("The company may terminate your account at any time without notice.")
    print(f"   Test inference: {test}")

except ImportError:
    print("❌ Install optimum: pip install optimum[onnxruntime]")
    sys.exit(1)
except Exception as e:
    print(f"❌ Export failed: {e}")
    sys.exit(1)