"""Engine configuration — all settings from environment variables."""

import os
from pathlib import Path


class Config:
    data_dir: Path
    model: str
    device: str
    ingest_device: str
    api_key: str | None
    host: str
    port: int

    def __init__(self):
        self.data_dir = Path(os.environ.get("KB_DATA_DIR", "/data"))
        self.model = os.environ.get("KB_MODEL", "all-MiniLM-L6-v2")
        self.device = os.environ.get("KB_DEVICE", "auto")
        self.ingest_device = os.environ.get("KB_INGEST_DEVICE", "auto")
        self.api_key = os.environ.get("KB_API_KEY") or None
        self.search_threshold = float(os.environ.get("KB_SEARCH_THRESHOLD", "0.01"))
        self.host = os.environ.get("KB_HOST", "0.0.0.0")
        self.port = int(os.environ.get("KB_PORT", "8000"))

    @property
    def db_path(self) -> Path:
        return self.data_dir / "kb.db"

    @property
    def hf_cache(self) -> Path:
        return self.data_dir / "hf_cache"

    @property
    def staging_dir(self) -> Path:
        return self.data_dir / "staging"

    def ensure_dirs(self):
        self.data_dir.mkdir(parents=True, exist_ok=True)
        self.hf_cache.mkdir(exist_ok=True)
        self.staging_dir.mkdir(exist_ok=True)


cfg = Config()