import sqlite3
import os
from typing import Any, Dict, List, Optional
import logging
from datetime import datetime
import threading

class MarketDB:
    def __init__(self, market: str, db_dir: str = "", date: Optional[datetime] = None):
        logging.debug(f"MarketDB.__init__ start for {market}")
        self.market = market
        self.db_dir = db_dir
        self.current_date = date or datetime.now()
        self.conn = None
        self._lock = threading.RLock()  # Use re-entrant lock to avoid deadlock
        logging.debug(f"MarketDB.__init__ before _connect_db for {market}")
        self._connect_db()
        logging.debug(f"MarketDB.__init__ end for {market}")
        
    def _get_db_path(self, date: datetime) -> str:
        db_name = f"{self.market}-{date.strftime('%y-%m-%d')}.db"
        return db_name if not self.db_dir else f"{self.db_dir.rstrip('/')}/{db_name}"
        
    def _connect_db(self):
        logging.debug(f"MarketDB._connect_db start for {self.market}")
        with self._lock:  # Thread-safe connection management
            try:
                if self.conn:
                    try:
                        self.conn.close()
                        logging.debug(f"Closed previous connection for {self.market}")
                    except Exception as e:
                        logging.warning(f"Error closing previous connection: {e}")
                if self.db_dir:
                    os.makedirs(self.db_dir, exist_ok=True)
                    logging.debug(f"Ensured db_dir exists for {self.market}")
                db_path = self._get_db_path(self.current_date)
                logging.debug(f"Connecting to sqlite3 at {db_path} for {self.market}")
                self.conn = sqlite3.connect(db_path)
                self.conn.execute('PRAGMA journal_mode=WAL')
                logging.info(f"Connected to database at {db_path}")
                self._create_tables()
                logging.debug(f"MarketDB._connect_db end for {self.market}")
            except Exception as e:
                logging.error(f"Failed to connect to database: {e}")
                raise

    def check_and_rotate_db(self):
        logging.debug(f"MarketDB.check_and_rotate_db start for {self.market}")
        current_date = datetime.now()
        if current_date.date() != self.current_date.date():
            logging.info(f"Date changed from {self.current_date.date()} to {current_date.date()}, rotating database")
            try:
                self.current_date = current_date
                self._connect_db()
                logging.info("Successfully rotated to new database")
            except Exception as e:
                logging.error(f"Failed to rotate database: {e}")
                try:
                    self.current_date = current_date.replace(hour=0, minute=0, second=0, microsecond=0)
                    self._connect_db()
                except Exception as fallback_error:
                    logging.critical(f"Failed to reconnect to previous database: {fallback_error}")
                    raise
        logging.debug(f"MarketDB.check_and_rotate_db end for {self.market}")

    def _create_tables(self):
        logging.debug(f"MarketDB._create_tables start for {self.market}")
        with self._lock:  # Thread-safe table creation
            cursor = self.conn.cursor()
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS trades (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    instrument TEXT,
                    trade_id TEXT,
                    price REAL,
                    size REAL,
                    side TEXT,
                    timestamp TEXT
                )
            ''')
            cursor.execute('''
                CREATE TABLE IF NOT EXISTS book (
                    id INTEGER PRIMARY KEY AUTOINCREMENT,
                    instrument TEXT,
                    bids TEXT,
                    asks TEXT,
                    timestamp TEXT
                )
            ''')
            self.conn.commit()
            logging.info("Database tables ensured.")
        logging.debug(f"MarketDB._create_tables end for {self.market}")

    def insert_trade(self, trade: Dict[str, Any]):
        self.check_and_rotate_db()
        with self._lock:  # Thread-safe insert
            try:
                cursor = self.conn.cursor()
                cursor.execute('''
                    INSERT INTO trades (instrument, trade_id, price, size, side, timestamp)
                    VALUES (?, ?, ?, ?, ?, ?)
                ''', (
                    trade.get('instrument'),
                    trade.get('trade_id'),
                    trade.get('price'),
                    trade.get('size'),
                    trade.get('side'),
                    trade.get('timestamp')
                ))
                self.conn.commit()
                logging.debug(f"Inserted trade: {trade}")
            except sqlite3.Error as e:
                logging.error(f"Database error during trade insert: {e}")
                self._handle_db_error()
                raise

    def insert_book(self, book: Dict[str, Any]):
        self.check_and_rotate_db()
        with self._lock:  # Thread-safe insert
            try:
                cursor = self.conn.cursor()
                bids = book.get('bids', [])
                asks = book.get('asks', [])
                best_bid = next((b for b in bids if float(b[1]) > 0), ['-', '-'])
                best_ask = next((a for a in asks if float(a[1]) > 0), ['-', '-'])
                cursor.execute('''
                    INSERT INTO book (instrument, bids, asks, timestamp)
                    VALUES (?, ?, ?, ?)
                ''', (
                    book.get('instrument'),
                    str(bids),
                    str(asks),
                    book.get('timestamp')
                ))
                self.conn.commit()
                logging.debug(f"Inserted book: {book.get('instrument', 'N/A')} ts:{book.get('timestamp', 'N/A')} bid:{best_bid} ask:{best_ask}")
            except sqlite3.Error as e:
                logging.error(f"Database error during book insert: {e}")
                self._handle_db_error()
                raise

    def _handle_db_error(self):
        try:
            self._connect_db()
        except Exception as e:
            logging.critical(f"Failed to reconnect to database after error: {e}")
            raise

    def close(self):
        with self._lock:  # Thread-safe close
            if self.conn:
                try:
                    self.conn.close()
                    logging.info("Database connection closed.")
                except Exception as e:
                    logging.error(f"Error closing database connection: {e}")
                finally:
                    self.conn = None