import os
from pathlib import Path

ROOT = Path(__file__).resolve().parent.parent
DATA_DIR = ROOT / "data"
STATIC_DIR = ROOT / "static"

EMBEDDING_MODEL = "BAAI/bge-small-zh-v1.5"
COLLECTION_NAME = "knowledge_bge_small_zh_v15"
CHUNK_SIZE = 360
CHUNK_OVERLAP = 60
DEFAULT_TOP_K = 4
LOW_SCORE = 0.45

os.environ.setdefault("ANONYMIZED_TELEMETRY", "False")
os.environ.setdefault("TOKENIZERS_PARALLELISM", "false")


def load_dotenv() -> None:
    path = ROOT / ".env"
    if not path.exists():
        return
    for raw in path.read_text(encoding="utf-8").splitlines():
        line = raw.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        key = key.strip()
        value = value.strip().strip('"').strip("'")
        if key and key not in os.environ:
            os.environ[key] = value


load_dotenv()


def llm_config() -> dict | None:
    key = os.getenv("OPENAI_API_KEY", "").strip()
    if not key:
        return None
    base = os.getenv("OPENAI_BASE_URL", "https://api.openai.com/v1").strip()
    model = os.getenv("OPENAI_MODEL", "gpt-4o-mini").strip()
    return {
        "key": key,
        "base": (base or "https://api.openai.com/v1").rstrip("/"),
        "model": model or "gpt-4o-mini",
    }