"""Grader for server_error task: 500 Internal Server Error."""

import sys
from pathlib import Path

_project_root = str(Path(__file__).parent.parent.parent)
if _project_root not in sys.path:
    sys.path.insert(0, _project_root)

from environment.api_triage_env import APITriageEnv
from environment.incident_generator import get_incident_by_type


def grade() -> float:
    """Grade the server_error task by simulating an optimal agent.

    Returns:
        Score strictly between 0 and 1.
    """
    try:
        env = APITriageEnv(max_steps=10)
        env.incident = get_incident_by_type("server_error")
        if env.incident is None:
            return 0.1
        env.fix_applied = False
        env.done = False
        env.step_counter = 0
        env.total_reward = 0.0

        # Optimal sequence: inspect → correct fix → resolve
        actions = ["inspect_logs", "escalate", "resolve"]
        for action in actions:
            state, reward, done, info = env.step(action)
            if done:
                if info.get("resolution") == "success":
                    return 0.95
                else:
                    return 0.1
        return 0.1
    except Exception:
        return 0.1