from __future__ import annotations

import os
from pathlib import Path

from .constants import MODEL_REVISION


def data_home() -> Path:
    value = os.environ.get("XDG_DATA_HOME")
    return Path(value).expanduser() if value else Path.home() / ".local" / "share"


def cache_home() -> Path:
    value = os.environ.get("XDG_CACHE_HOME")
    return Path(value).expanduser() if value else Path.home() / ".cache"


def default_model_dir() -> Path:
    override = os.environ.get("UNLIMITED_OCR_MODEL_DIR")
    if override:
        return Path(override).expanduser()
    return data_home() / "unlimited-ocr-rdna4" / "models" / MODEL_REVISION


def default_cache_dir() -> Path:
    return cache_home() / "unlimited-ocr-rdna4"