import os
from pathlib import Path


class Config:
    """Configuration loaded from environment variables (OCR_ prefix)."""

    BASE_DIR = Path(__file__).parent

    # Core paths
    UPLOAD_DIR = Path(os.environ.get("OCR_UPLOAD_DIR", str(BASE_DIR / "uploads")))

    # Security
    API_KEY = os.environ.get("OCR_API_KEY", "")

    # Server (defaults for HF Spaces: 0.0.0.0:7860)
    DEBUG = os.environ.get("OCR_DEBUG", "false").lower() == "true"
    HOST = os.environ.get("OCR_HOST", "0.0.0.0")
    PORT = int(os.environ.get("OCR_PORT", "7860"))

    # Limits
    MAX_CONTENT_LENGTH = int(os.environ.get("OCR_MAX_REQUEST_SIZE", str(10 * 1024 * 1024)))

    # HF Inference API (for VLM extraction)
    HF_API_TOKEN = os.environ.get("HF_API_TOKEN", "")
    VLM_MODEL = os.environ.get("OCR_VLM_MODEL", "Qwen/Qwen3-VL-8B-Instruct")
    VLM_PROVIDER = os.environ.get("OCR_VLM_PROVIDER", "novita")

    # Supported document types
    SUPPORTED_DOC_TYPES = {"sa_id_card", "sa_id_book", "passport"}

    # Logging
    LOG_LEVEL = os.environ.get("OCR_LOG_LEVEL", "INFO")
    LOG_FORMAT = os.environ.get("OCR_LOG_FORMAT", "json")