from __future__ import annotations

from typing import List

from tasks.base_task import BaseTask


class MediumTask(BaseTask):
    task_id = "medium_silent_cache"
    difficulty = "medium"
    config_path = "configs/medium_dag.yaml"
    step_limit = 10

    def get_system_prompt(self) -> str:
        return (
            "You are diagnosing a silent-cache scenario. "
            "No explicit errors appear; use span details to detect timeout fallback patterns."
        )

    def grade(
        self,
        declared_service: str | None,
        declared_fault: str | None,
        steps_used: int,
        rewards: List[float],
    ) -> float:
        correct = declared_service == "Redis_Cache" and declared_fault == "Timeout"
        return self._score_correct(correct=correct, steps_used=steps_used, step_limit=self.step_limit)