app/models.py

import pandas as pd
from app.config import settings

df = None
icd_lookup = {}

def load_icd_dataset():
    global df, icd_lookup
    try:
        df = pd.read_csv(settings.ICD_DATA_PATH)  # CSV with TestName, ICDCode
        icd_lookup = dict(zip(df["TestName"], df["ICDCode"]))
        print("✅ Loaded ICD dataset")
    except FileNotFoundError:
        df = None
        icd_lookup = {}
        print("⚠️ No ICD dataset found. Please provide ICD CSV")

# Load immediately on import
load_icd_dataset()