import os
import runpy
import subprocess

INDEX_FLAG = "data/.faiss_built"

def build_index_if_needed():
    if not os.path.exists(INDEX_FLAG):
        print("[BOOTSTRAP] FAISS index not found. Building index...")
        subprocess.check_call(
            ["python", "app/rag/build_index.py"]
        )
        os.makedirs("data", exist_ok=True)
        with open(INDEX_FLAG, "w") as f:
            f.write("built")
        print("[BOOTSTRAP] FAISS index built successfully.")
    else:
        print("[BOOTSTRAP] FAISS index already exists. Skipping rebuild.")

if __name__ == "__main__":
    build_index_if_needed()
    runpy.run_module("ui.app", run_name="__main__")