"""
Configuration module for RAG system.
Handles environment variable loading, validation, and constants.
"""
import os
from dotenv import load_dotenv

# Load environment variables
load_dotenv()

# Constants
MAX_CONTENT_LENGTH = 50000
MAX_TAG_LENGTH = 100
MAX_GRAPH_NODES = 100
REQUEST_TIMEOUT = int(os.getenv("REQUEST_TIMEOUT", "30"))
AUTO_LINK_THRESHOLD = float(os.getenv("AUTO_LINK_THRESHOLD", "0.75"))
AUTO_LINK_TOP_K = int(os.getenv("AUTO_LINK_TOP_K", "5"))

# Environment variables
PROJECT_ID = os.getenv("GOOGLE_CLOUD_PROJECT", "hypnotic-tenure-swz46")
LOCATION = os.getenv("GOOGLE_CLOUD_LOCATION", "us-central1")
VERTEX_API_KEY = os.getenv("VERTEX_API_KEY")
PINECONE_API_KEY = os.getenv("PINECONE_API_KEY")
PINECONE_INDEX_NAME = os.getenv("PINECONE_INDEX_NAME", "memory-index")

# Server settings
FASTMCP_HOST = os.getenv("FASTMCP_HOST", "0.0.0.0")
FASTMCP_PORT = int(os.getenv("FASTMCP_PORT", "8000"))

def validate_env() -> None:
    """Validate required environment variables are present."""
    required = ["VERTEX_API_KEY", "PINECONE_API_KEY", "PINECONE_INDEX_NAME"]
    missing = [k for k in required if not os.getenv(k)]
    if missing:
        raise RuntimeError(f"필수 환경 변수가 없습니다: {missing}")

# Validate on import
validate_env()