#!/usr/bin/env python3
"""
Monty execution helper.

This is intentionally minimal:
- No external functions
- No filesystem access
- No network
- No environment access
- Synchronous run only

If pydantic-monty is not installed, this module raises a clear error.
"""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any, Dict, Optional, Tuple


@dataclass
class MontyExecResult:
    output: Any
    stdout: str
    stderr: str


def run_monty_pure(code: str, inputs: Optional[Dict[str, Any]] = None, type_check: bool = True) -> MontyExecResult:
    try:
        import pydantic_monty  # provided by `pydantic-monty`
    except Exception as e:
        raise RuntimeError(
            "pydantic_monty not available. Install with: pip install pydantic-monty (or uv add pydantic-monty)."
        ) from e

    if inputs is None:
        inputs = {}

    # Monty captures stdout/stderr internally, but to be robust we also capture at the runner layer.
    # Here we only return the Monty output; runner will wrap stdout/stderr capture.
    m = pydantic_monty.Monty(
        code,
        inputs=list(inputs.keys()),
        external_functions=[],
        script_name="tool_exec.py",
        type_check=type_check,
    )

    # Per upstream examples, Monty can run synchronously with .run(inputs={...}). :contentReference[oaicite:2]{index=2}
    out = m.run(inputs=inputs)

    # We return empty strings here; the runner will capture actual stdout/stderr around this call.
    return MontyExecResult(output=out, stdout="", stderr="")