"""Load configuration from environment. No secrets in repo."""
import os
from pathlib import Path

from dotenv import load_dotenv

load_dotenv()


def _env(key: str, default: str | None = None) -> str:
    val = os.environ.get(key)
    if val is not None:
        return val.strip()
    if default is not None:
        return default
    raise ValueError(f"Missing required env: {key}")


def get_api_keys() -> list[str]:
    """Comma-separated API keys. At least one required."""
    raw = _env("API_KEYS", "")
    if not raw:
        raise ValueError("API_KEYS must be set (comma-separated list)")
    return [k.strip() for k in raw.split(",") if k.strip()]


def get_storage_path() -> Path:
    """Directory for document files."""
    p = Path(_env("STORAGE_PATH", "./data/files"))
    return p.resolve()


def get_database_path() -> Path:
    """SQLite database path for metadata."""
    p = Path(_env("DATABASE_PATH", "./data/local_office.db"))
    return p.resolve()


def get_max_upload_bytes() -> int:
    """Max upload size in bytes."""
    return int(_env("MAX_UPLOAD_BYTES", "20971520"))


def get_rate_limit_per_minute() -> int:
    """Rate limit per API key per minute."""
    return int(_env("RATE_LIMIT_PER_MINUTE", "60"))