import logging
import time
from typing import List, Dict, Any

logger = logging.getLogger("OmniClaw.VectorSync")

class VectorSyncLayer:
    """
    Manages vector database synchronization between the Edge Node (SQLite-vec)
    and the Compute Core (LanceDB).
    Implements a lazy, pull-on-query model.
    """
    def __init__(self, is_edge_node: bool, db_path: str):
        self.is_edge_node = is_edge_node
        self.db_path = db_path
        
        if self.is_edge_node:
            self._init_sqlite_vec()
        else:
            self._init_lancedb()

    def _init_sqlite_vec(self):
        """Initialize SQLite with sqlite-vec extension for the Edge Node"""
        # import sqlite3
        # import sqlite_vec
        # self.conn = sqlite3.connect(self.db_path)
        # self.conn.enable_load_extension(True)
        # sqlite_vec.load(self.conn)
        logger.info(f"Initialized SQLite-vec on Edge Node at {self.db_path}")

    def _init_lancedb(self):
        """Initialize LanceDB for the Compute Core"""
        # import lancedb
        # self.db = lancedb.connect(self.db_path)
        logger.info(f"Initialized LanceDB on Compute Core at {self.db_path}")

    def search_local(self, query_vector: List[float], threshold: float = 0.75) -> Dict[str, Any]:
        """
        Search local vector store.
        Returns {"found": bool, "results": [...]}
        """
        # Mock logic
        logger.debug("Searching local vector index...")
        # if max_similarity < threshold, return found=False
        return {"found": False, "results": []}

    def generate_sync_hash(self) -> str:
        """
        Generates a hash of the current local vector IDs.
        Used by the Edge Node to request missing vectors.
        """
        # Mock hash
        return "hash_12345"

    def apply_sync_update(self, vectors: List[Dict[str, Any]]):
        """
        Applies vectors downloaded from the Compute Core into the local SQLite-vec.
        """
        if not self.is_edge_node:
            return
            
        logger.info(f"Applying {len(vectors)} new vectors to SQLite-vec cache.")
        # Evict old entries if capacity reached (LRU)
        # self.conn.execute("INSERT INTO vectors ...")
