"""Shared filesystem roots for the static compilation pipeline."""

from __future__ import annotations

from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[2]
PROFILE_RESULTS_ROOT = PROJECT_ROOT / "results" / "static-opimization" / "profiles"
MODEL_PREFERENCE_PROFILE_ROOT = PROFILE_RESULTS_ROOT / "model-preference"
FINAL_PROFILE_ROOT = PROFILE_RESULTS_ROOT / "models"


def model_path_parts(model_identifier: str) -> tuple[str, ...]:
    """Validate a provider-qualified model identifier for filesystem use."""

    parts = tuple(model_identifier.strip().strip("/").split("/"))
    if len(parts) < 2 or any(part in {"", ".", ".."} for part in parts):
        raise ValueError(
            "model must use provider/model-id format without empty or relative segments"
        )
    return parts


def model_directory(root: Path, model_identifier: str) -> Path:
    return root.joinpath(*model_path_parts(model_identifier))


def model_profile_path(root: Path, model_identifier: str) -> Path:
    canonical = model_directory(root, model_identifier) / "profile.json"
    legacy = root / model_identifier.strip().strip("/").replace("/", "_") / "profile.json"
    return legacy if legacy.is_file() and not canonical.is_file() else canonical