from __future__ import annotations
from services.model_router import ModelRouter
from config.prompts import TUTOR_AGENT_SYSTEM

class TutorAgent:
    def __init__(self, router: ModelRouter): self._router = router

    def hint(self, question: str, student_answer: str, correct_answer: str,
             explanation: str, source_excerpt: str = "") -> str:
        context = f"\nSource context: {source_excerpt}" if source_excerpt else ""
        prompt = (f"Question: {question}\nStudent answered: {student_answer}\n"
                  f"Correct answer (do not reveal directly): {correct_answer}\n"
                  f"Stored explanation: {explanation}{context}\n\nProvide a Socratic hint.")
        return self._router.reason(prompt, TUTOR_AGENT_SYSTEM).strip()