#!/usr/bin/env python3
"""
PreMemoryPrompt Hook - User context loader example

Executed when the fact extraction prompt (FACT_RETRIEVAL_PROMPT) is loaded,
decides whether to enable the retrieval policy that forbids using the model's
own knowledge based on an environment variable.
"""
import os
import sys
from pathlib import Path


def main():
    enable_self_knowledge = (
        os.getenv("ENABLE_SELF_KNOWLEDGE", "false").lower() == "true"
    )
    policy_name = (
        "retrieval-policy.md"
        if enable_self_knowledge
        else "retrieval-policy-forbidden-self-knowledge.md"
    )
    prompt_file = Path(__file__).parent / policy_name
    print(prompt_file.read_text(encoding="utf-8"))
    return 0


if __name__ == '__main__':
    sys.exit(main())
