"""Agent-neutral configuration for the coding-agent seam.

Neutral ``CODING_*`` settings with backward-compatible ``PI_CODING_*`` fallbacks,
so the coding backend can be selected/tuned without the tool layer hard-coding a
specific agent.
"""

from __future__ import annotations

import os
from collections.abc import Mapping

from integrations.llm_cli.timeout_utils import resolve_timeout_from_env

_DEFAULT_PROVIDER = "pi"
_DEFAULT_TIMEOUT_SEC = 600.0
_MIN_TIMEOUT_SEC = 60.0
_MAX_TIMEOUT_SEC = 1800.0


def coding_agent_provider(env: Mapping[str, str] | None = None) -> str:
    """Which coding-agent backend to use (``CODING_AGENT``; defaults to ``pi``)."""
    source = env if env is not None else os.environ
    return (source.get("CODING_AGENT") or _DEFAULT_PROVIDER).strip().lower() or _DEFAULT_PROVIDER


def coding_model(env: Mapping[str, str] | None = None) -> str | None:
    """Model override for the coding agent (``CODING_MODEL``, else ``PI_CODING_MODEL``)."""
    source = env if env is not None else os.environ
    return (source.get("CODING_MODEL") or source.get("PI_CODING_MODEL") or "").strip() or None


def coding_workspace(env: Mapping[str, str] | None = None) -> str:
    """Workspace the agent edits (``CODING_WORKSPACE``, else ``PI_CODING_WORKSPACE``, else cwd)."""
    source = env if env is not None else os.environ
    return (
        source.get("CODING_WORKSPACE") or source.get("PI_CODING_WORKSPACE") or ""
    ).strip() or os.getcwd()


def coding_timeout_seconds() -> float:
    """Per-run timeout (``CODING_TIMEOUT_SECONDS``, else ``PI_CODING_TIMEOUT_SECONDS``)."""
    env_key = (
        "CODING_TIMEOUT_SECONDS"
        if os.environ.get("CODING_TIMEOUT_SECONDS")
        else "PI_CODING_TIMEOUT_SECONDS"
    )
    return resolve_timeout_from_env(
        env_key=env_key,
        default=_DEFAULT_TIMEOUT_SEC,
        minimum=_MIN_TIMEOUT_SEC,
        maximum=_MAX_TIMEOUT_SEC,
    )