import random

from env.task_graders import TASK_AGENT_GRADERS

# Declared for GET /tasks + openenv.yaml (Phase 1 task/grader discovery).
TASK_MANIFEST = [
    {
        "name": "easy",
        "description": (
            "Fewer cache items and low volatility; easier to infer staleness from noisy observations."
        ),
        "difficulty": "easy",
        "max_steps": 10,
        "grader": True,
        "grader_kind": "programmatic",
        "grader_callable": "env.task_graders:easy_agent_grader",
        "score_range": [0.0, 1.0],
    },
    {
        "name": "medium",
        "description": (
            "More items and moderate volatility; invalidation vs keep tradeoffs matter more."
        ),
        "difficulty": "medium",
        "max_steps": 10,
        "grader": True,
        "grader_kind": "programmatic",
        "grader_callable": "env.task_graders:medium_agent_grader",
        "score_range": [0.0, 1.0],
    },
    {
        "name": "hard",
        "description": (
            "Most items and high volatility; staleness signal is noisy and costly mistakes are easier."
        ),
        "difficulty": "hard",
        "max_steps": 10,
        "grader": True,
        "grader_kind": "programmatic",
        "grader_callable": "env.task_graders:hard_agent_grader",
        "score_range": [0.0, 1.0],
    },
]


def get_task(task_id):
    if task_id == "easy":
        return {"num_items": 2, "volatility": 0.1}

    elif task_id == "medium":
        return {"num_items": 3, "volatility": 0.4}

    elif task_id == "hard":
        return {"num_items": 4, "volatility": 0.8}
    else:
        return {
            "num_items": 3,
            "volatility": 0.3,
        }


def sample_task(rng=None):
    r = rng if rng is not None else random
    return r.choice(["easy", "medium", "hard"])


def list_graders():
    """Return task ids that have an enabled agent grader."""
    return [
        {
            "task": name,
            "grader_enabled": fn is not None,
            "callable": getattr(fn, "__name__", str(fn)),
        }
        for name, fn in TASK_AGENT_GRADERS.items()
    ]