from pathlib import Path
import torch
import torch.nn.functional as F
from transformers import AutoTokenizer, AutoModelForSequenceClassification
import os

# Set a custom cache directory to avoid permission issues
os.environ["HF_HOME"] = "/tmp/huggingface_cache"
os.environ["TRANSFORMERS_CACHE"] = "/tmp/huggingface_cache"

# Set Hugging Face token for private repository (if applicable)
hf_token = os.environ.get("HF_TOKEN", None) 

# Define the repository ID
repo_id = "milanchndr/email-classification-model"

# Load the model and tokenizer
try:
    model = AutoModelForSequenceClassification.from_pretrained(
        repo_id,
        cache_dir="/tmp/huggingface_cache",
        use_auth_token=hf_token
    )
    tokenizer = AutoTokenizer.from_pretrained(
        repo_id,
        cache_dir="/tmp/huggingface_cache",
        use_auth_token=hf_token
    )
    print("Model and tokenizer loaded successfully!")
except Exception as e:
    print(f"Error loading model or tokenizer: {e}")
    exit()


# Set model to evaluation mode
model.eval()



model.eval()

label_map = {0: "Incident", 1: "Request", 2: "Change", 3: "Problem"}


def classify_email(email: str) -> str:
    """Classify an email into a support category using a fine-tuned model.

    Args:
        email (str): The email text to classify.

    Returns:
        str: The predicted category (Incident, Request, Change, or Problem).
    """
    inputs = tokenizer(
        email, padding=True, truncation=True, max_length=512, return_tensors="pt"
    )
    with torch.no_grad():
        outputs = model(**inputs)
        probs = F.softmax(outputs.logits, dim=1)
        pred = torch.argmax(probs, dim=1).item()
    return label_map[pred]